BEFORE YOU START

This is a high-competition, high-quality RC car intended for persons aged 16 Read carefully and fully understand the instructions before beginning assembly.
years and older with previous experience building and operating RC model
racing cars. This is not a toy; it is a precision racing model. This model racing Make sure you review this entire manual, download and use set-up book from
car is not intended for use by beginners, inexperienced customers, or by the web, and examine all details carefully. If for some reason you decide this is
children without direct supervision of a responsible, knowledgeable adult. If not what you wanted or expected, do not continue any further. Your hobby dealer
you do not fulfill these requirements, please return the kit in unused and can not accept your kit for return or exchange after it has been partially or fully
unassembled form back to the shop where you have purchased it. assembled.

Before building and operating your XRAY, YOU MUST read through all of the Contents of the box may differ from pictures. In line with our policy of continuous
operating instructions and instruction manual and fully understand them to product development, the exact specifications of the kit may vary without prior
get the maximum enjoyment and prevent unnecessary damage. notice.

CUSTOMER SUPPORT
We have made every effort to make these instructions as easy to understand as XRAY Europe XRAY USA
possible. However, if you have any difficulties, problems, or questions, please do not K Vystavisku 6992 RC America, 2030 Century Center Blvd #15
hesitate to contact the XRAY support team at info@teamxray.com. Also, please visit 91101 Trenčín Irving, TX 75062
our Web site at www.teamxray.com to find the latest updates, set-up information, Slovakia, EUROPE USA
option parts, and many other goodies. We pride ourselves on taking excellent care Phone: 421-32-7401100 Phone: (214) 744-2400
of our customers. Fax: 421-32-7401109 Fax: (214) 744-2401
E-mail: info@teamxray.com E-mail: xray@rcamerica.com
You can join thousands of XRAY fans and enthusiasts in our online community at:
www.teamxray.com

FAILURE TO FOLLOW THESE INSTRUCTIONS WILL BE CONSIDERED AS ABUSE AND/OR NEGLECT.

SAFETY PRECAUTIONS
Contains: reference, even after completing the assembly. Use only genuine and original
LEAD (CAS 7439-92-1) ANTIMONY (CAS 7440-36-0) authentic XRAY parts for maximum performance. Using any third party parts
WARNING: This product contains a chemical known to the state of California on this model will void guaranty immediately.
to cause cancer and birth defects or other reproductive harm.
CAUTION: CANCER HAZARD Improper operation may cause personal and/or property damage. XRAY
Contains lead, a listed carcinogen. Lead is harmful if ingested. Wash and its distributors have no control over damage resulting from shipping,
thoroughly after using. DO NOT use product while eating, drinking or using improper construction, or improper usage. XRAY assumes and accepts no
tobacco products. May cause chronic effects to gastrointestinal tract, CNS, responsibility for personal and/or property damages resulting from the use
kidneys, and blood. MAY CAUSE BIRTH DEFECTS. of improper building materials, equipment and operations. By purchasing
any item produced by XRAY, the buyer expressly warrants that he/she is in
When building, using and/or operating this model always wear protective compliance with all applicable federal, state and local laws and regulation
glasses and gloves. regarding the purchase, ownership and use of the item. The buyer expressly
agrees to indemnify and hold harmless XRAY for all claims resulting directly
Take appropriate safety precautions prior to operating this model. You are or indirectly from the purchase, ownership or use of the product. By the act
responsible for this model‘s assembly and safe operation! Please read the of assembling or operating this product, the user accepts all resulting liability.
instruction manual before building and operating this model and follow all If the buyer is not prepared to accept this liability, then he/she should return
safety precautions. Always keep the instruction manual at hand for quick this kit in new, unassembled, and unused condition to the place of purchase.

IMPORTANT NOTES – GENERAL

• This product is not suitable for children under 16 years of age without the • Disconnect the battery pack before storing your model.
direct supervision of a responsible and knowledgeable adult. • When learning to operate your model, go to an area that has no obstacles
• Carefully read all manufacturers warnings and cautions for any parts used that can damage your model if your model suffers a collision.
in the construction and use of your model. • Remove any sand, mud, dirt, grass or water before putting your model
• Assemble this kit only in places away from the reach of very small children. away.
• First-time builders and users should seek advice from people who have • If the model behaves strangely, immediately stop the model, check and
building experience in order to assemble the model correctly and to allow clear the problem.
the model to reach its performance potential. • To prevent any serious personal injury and/or damage to property, be
• Exercise care when using tools and sharp instruments. responsible when operating all remote controlled models.
• Take care when building, as some parts may have sharp edges. • The model car is not intended for use on public places and roads or areas
• Keep small parts out of reach of small children. Children must not be where its operation can conflict with or disrupt pedestrian or vehicular traffic.
allowed to put any parts in their mouth, or pull vinyl bag over their head. • Because the model car is controlled by radio, it is subject to radio
• Read and follow instructions supplied with paints and/or cement, if used interference from many sources that are beyond your control. Since radio
(not included in kit). interference can cause momentary loss of control, always allow a safety
• Immediately after using your model, do NOT touch equipment on the margin in all directions around the model in order to prevent collisions.
model such as the motor and speed controller, because they generate high • Do not use your model:
temperatures. You may seriously burn yourself seriously touching them. - Near real cars, animals, or people that are unaware that an RC car is being
• Follow the operating instructions for the radio equipment at all times. driven.
• Do not put fingers or any objects inside rotating and moving parts, as this - In places where children and people gather
may cause damage or serious injury as your finger, hair, clothes, etc. may - In residential districts and parks
get caught. - In limited indoor spaces
• Be sure that your operating frequency is clear before turning on or running - In wet conditions
your model, and never share the same frequency with somebody else at the - In the street
same time. Ensure that others are aware of the operating frequency you - In areas where loud noises can disturb others, such as hospitals and
are using and when you are using it. residential areas.
• Use a transmitter designed for ground use with RC cars. Make sure that no - At night or anytime your line of sight to the model may be obstructed or
one else is using the same frequency as yours in your operating area. Using impaired in any way.
the same frequency at the same time, whether it is driving, flying or sailing,
can cause loss of control of the RC model, resulting in a serious accident. To prevent any serious personal injury and/or damage to property, please be
• Always turn on your transmitter before you turn on the receiver in the car. responsible when operating all remote controlled models.
Always turn off the receiver before turning your transmitter off.
• Keep the wheels of the model off the ground when checking the operation
of the radio equipment.

2
 IMPORTANT NOTES – ELECTRICAL
• Insulate any exposed electrical wiring (using heat shrink tubing or electrical or using inferior chargers can cause the batteries to become dangerously
tape) to prevent dangerous short circuits. Take maximum care in wiring, hot. Recharge battery when necessary. Continual recharging may damage
connecting and insulating cables. Make sure cables are always connected battery and, in the worst case, could build up heat leading to fire. If battery
securely. Check connectors for if they become loose. And if so, reconnect becomes extremely hot during recharging, please ask your local hobby
them securely. Never use RC models with damaged wires. A damaged wire shop for check and/or repair and/or replacement.
is extremely dangerous, and can cause short-circuits resulting in fire. Please • Regularly check the charger for potential hazards such as damage to the
have wires repaired at your local hobby shop. cable, plug, casing or other defects. Ensure that any damage is rectified
• Low battery power will result in loss of control. Loss of control can occur due before using the charger again. Modifying the charger may cause short-
to a weak battery in either the transmitter or the receiver. Weak running circuit or overcharging leading to a serious accident. Therefore do not
battery may also result in an out of control car if your car‘s receiver power is modify the charger.
supplied by the running battery. Stop operation immediately if the car starts • Always unplug charger when recharging is finished.
to slow down. • Do not recharge battery while battery is still warm. After use, battery retains
• When not using RC model, always disconnect and remove battery. heat. Wait until it cools down before charging.
• Do not disassemble battery or cut battery cables. If the running battery • Do not allow any metal part to short circuit the receiver batteries or other
short-circuits, approximately 300W of electricity can be discharged, leading electrical/electronic device on the model.
to fire or burns. Never disassemble battery or cut battery cables. • Immediately stop running if your RC model gets wet as may cause short
• Use a recommended charger for the receiver and transmitter batteries circuit.
and follow the instructions correctly. Over-charging, incorrect charging, • Please dispose of batteries responsibly. Never put batteries into fire.

R/C & BUILDING TIPS

• Make sure all fasteners are properly tightened. Check them periodically. Please support your local hobby shop. We at XRAY Model Racing Cars support
• Make sure that chassis screws do not protrude from the chassis. all local hobby dealers. Therefore we ask you, if at all possible, to purchase
• For the best performance, it is very important that great care is taken to XRAY products at your hobby dealer and give them your support like we do.
ensure the free movement of all parts. If you have difficulty finding XRAY products, please check out www.teamxray.
• Clean all ball-bearings so they move very easily and freely. com to get advice, or contact us via email at info@teamxray.com, or contact
• Tap or pre-thread the plastic parts when threading screws. the XRAY distributor in your country.
• Self-tapping screws cut threads into the parts when being tightened. Do
not use excessive force when tightening the self-tapping screws because
you may strip out the thread in the plastic. We recommended you stop
tightening a screw when you feel some resistance.
• Ask your local hobby shop for any advice.

WARRANTY
XRAY guarantees this model kit to be free from defects in both material and but is not limited to damage from crashing, chemical and/or water damage,
workmanship within 30 days of purchase. The total monetary value under excessive moisture, improper or no maintenance, or user modifications which
warranty will in no case exceed the cost of the original kit purchased. This compromise the integrity of components. Warranty will not cover components
warranty does not cover any components damaged by use or modification that are considered consumable on RC vehicles. XRAY does not pay nor refund
or as a result of wear. Part or parts missing from this kit must be reported shipping on any component sent to XRAY or its distributors for warranty. XRAY
within 30 days of purchase. No part or parts will be sent under warranty reserves the right to make the final determination of the warranty status of
without proof of purchase. Should you find a defective or missing part, contact any component or part.
the local distributor. Service and customer support will be provided through
local hobby store where you have purchased the kit, therefore make sure to Limitations of Liability
purchase any XRAY products at your local hobby store. This model racing car XRAY makes no other warranties expressed or implied. XRAY shall not be liable
is considered to be a high-performance racing vehicle. As such this vehicle for any loss, injury or damages, whether direct, indirect, special, incidental,
will be used in an extreme range of conditions and situations, all which may or consequential, arising from the use, misuse, or abuse of this product and/
cause premature wear or failure of any component. XRAY has no control over or any product or accessory required to operate this product. In no case shall
usage of vehicles once they leave the dealer, therefore XRAY can only offer XRAY‘s liability excess the monetary value of this product.
warranty against all manufacturer‘s defects in materials, workmanship, and
assembly at point of sale and before use. No warranties are expressed or
implied that cover damage caused by what is considered normal use, or cover Take adequate safety precautions prior to operating this model. You
or imply how long any model cars‘ components or electronic components will are responsible for this model’s assembly and safe operation.
last before requiring replacement.
Disregard of the any of the above cautions may lead to accidents,
Due to the high performance level of this model car you will need to personal injury, or property damage. XRAY MODEL RACING CARS
periodically maintain and replace consumable components. Any and all assumes no responsibility for any injury, damage, or misuse of this
warranty coverage will not cover replacement of any part or component product during assembly or operation, nor any addictions that may
damaged by neglect, abuse, or improper or unreasonable use. This includes arise from the use of this product.
All rights reserved.

QUALITY CERTIFICATE
XRAY MODEL RACING CARS uses only the highest quality materials, the cannot guarantee any parts once you start racing the car. Products which have
best compounds for molded parts and the most sophisticated manufacturing been worn out, abused, neglected or improperly operated will not be covered
processes of TQM (Total Quality Management). We guarantee that all parts under warranty.
of a newly-purchased kit are manufactured with the highest regard to quality. We wish you enjoyment of this high-quality and high-performance RC car and
However, due to the many factors inherent in model racecar competition, we wish you best success on the track!

In line with our policy of continuous product development, the exact specifications of the kit may
vary. In the unlikely event of any problems with your new kit, you should contact the model shop
where you purchased it, quoting the part number.
We do reserve all rights to change any specification without prior notice. All rights reserved.

3
 TOOLS REQUIRED

Allen 1.5mm (#111545 - HUDY EXCLUSIVE Limited Edition)

Combination Pliers
(HUDY #189020)

Allen 2.0mm (#112045- HUDY EXCLUSIVE Limited Edition)

Allen 3.0mm (#113045- HUDY EXCLUSIVE Limited Edition)

Side Cutters
(HUDY #189010)

Arm Reamer 3.0mm (#107643 - HUDY EXCLUSIVE Limited Edition)

Socket 5.5mm (#175535 - HUDY EXCLUSIVE Limited Edition)

Pocket Hobby Knife (HUDY #188981)

Socket 7.0mm (#177035 - HUDY EXCLUSIVE Limited Edition)

Special Tool for turnbuckles, nuts (HUDY #181090)

Reamer (#107602 - HUDY EXCLUSIVE Limited Edition)

Professional Multi Tool

(HUDY #183011)
Turnbuckle Wrench 4mm (HUDY #181040)
Scissors (HUDY #188990)

Turnbuckle Wrench 3mm (HUDY #181030)

Tweezer
INCLUDED EQUIPMENT REQUIRED
Transmitter Receiver Speed Controller Steering Servo
* Kit includes smaller but sufficient amount
of oil and grease to build the car.

450cSt (#106345) 5.000cSt (#106450)

HUDY Premium Silicone Oils HUDY Premium Silicone Oils

Electric Motor Pinion Gear LiPo Battery Battery Charger

with Setscrew

Lexan™ Paint Wheels & Tires & Inserts 190mm Bodyshell Double-sided Tape
OIL OIL
(HUDY #803053 C3-28) (HUDY #107875)
(HUDY #803062 A1-36)

(HUDY #106210)
Premium Graphite Grease

Fibre Tape Bearing Oil Threadlock CA glue

(HUDY #107870) (HUDY #106230)

TL CA
OIL

4
NOT INCLUDED

Alexander Hagberg (Factory Driver) SAMPLE OF OPTIONAL PARTS XRAY offers wide range of optional tuning parts
which are listed in a table like this. Please refer
When a QR CODE is found in the instruction manual, #30XXXX TYPE1 OPTION 1
to the exploded view of each main section to verify
scan the code to be directed to an online video that #30XXXX TYPE1 OPTION 2 which part is included in the kit while all other parts
explains that feature or adjustment in more detail. #30XXXX TYPE1 INCLUDED are available only as an optional part and must be
Make sure to watch all of the instructional videos to purchased separately.
▶ VIDEO TECH TIP #30XXXX TYPE1 OPTION 3
get the most performance out of your car.

COLOR INDICATIONS
At the beginning of each section is an exploded view of the parts to be assembled. There is also a list of all 305134 STYLE A - indicates parts that are included in the bag marked for the section.
the parts and part numbers that are related to the assembly of that section.
301004 STYLE B - indicates parts that are included in the box.
The part descriptions are color-coded to make it easier for you to identify the source of a part. Here are
what the different colors mean: 304900 STYLE C - indicates parts that are already assembled from previous steps.

CHASSIS PREPARATION
To protect and seal edges of graphite parts, sand edges smooth and then apply CA glue.

Do this for: chassis edges, countersunk holes, and shock towers.

▶ VIDEO TECH TIP

CHASSIS PREPARATION

CA

Apply only a bit of CA glue in the countersunk holes.

CA

CA

Apply only a bit of CA glue in the countersunk holes.

5
 1. GEAR DIFFERENTIAL & FRONT SOLID AXLE
#304932 #309002
GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4) 941015 SET OF CERAMIC BALL-BEARINGS (14)
304970
304910

964031 972050

981210
304980

964050
304930
GEAR DIFFERENTIAL 902310
304990 941015

972050 304930
305188
903256 971240
305134
304970

304910 902310
941015 305188
305134
981210 COMPOSITE SOLID AXLE
941015

#304971 #305136 #305137

HUDY SPRING STEEL™ OUTDRIVES ALU SOLID DRIVESHAFT ADAPTERS STEEL LIGHTWEIGHT SOLID AXLE DRIVESHAFT
ADAPTERS HUDY SPRING STEEL™

BAG 304900 XRAY GEAR DIFFERENTIAL - SET 902310 HEX SCREW SH M3x10 (10)
304910 COMPOSITE GEAR DIFF. CASE & COVER 903256 HEX SCREW SFH M2.5x6 (10)
304930 COMPOSITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4) 941015 BALL-BEARING 10x15x4 RUBBER SEALED - OIL (2)
304970 ALU GEAR DIFF OUTDRIVE ADAPTER - 7075 T6 (2) 964031 WASHER S 3.5x10x0.2 (10)
304980 COMPOSITE GEAR DIFF CROSS PIN 964050 WASHER S 5x15x0.3 (10)
304990 DIFF GASKET (4) 971240 SILICONE O-RING 24x0.7 (10)
305134 STEEL SOLID AXLE DRIVESHAFT ADAPTER - HUDY SPRING STEEL™ (2) 972050 SILICONE O-RING 5x2 (10)
305188 COMPOSITE SOLID AXLE 38T - SET 981210 PIN 2x10 (10)

➍ STEP ➍ ➎ DETAIL #304971

DETAIL
➍ ➎ HUDY SPRING STEEL™ OUTDRIVES

964050
S 5x15x0.3

➌
➎ ➋

972050
O 5x2

981210 #304932
P 2x10
GRAPHITE GEAR DIFF BEVEL & SATELLITE GEARS (2+4)

NOTE
ORIENTATION

964050 STEP ➍ DETAIL

S 5x15x0.3 ➊
Use tweezers to
insert pin.
➍ CUTAWAY VIEW

972050
O 5x2
➋

➌
981210
P 2x10
➎

6
 1. GEAR DIFFERENTIAL & FRONT SOLID AXLE

#304932
GRAPHITE GEAR DIFF BEVEL & INITIAL SETTING
SATELLITE GEARS (2+4) 5.000cSt
964031
S 3.5x10x0.2

Fill differential up to the top of the diff pin.

DO NOT fill the diff to the top of the housing.

TO ENSURE YOU HAVE THE SAME AMOUNT OF OIL FROM REBUILD TO REBUILD, DO THE FOLLOWING:

#107865
HUDY Ultimate Digital Pocket
7.90g Scale 300g±0.01g 9.40g

➊ Put the diff (without oil) on the scale and check the 7.9g + 1.5g = 9.4g ➋ Slowly pour oil into the diff and watch the weight. Add 1.5g of oil
weight (approximately 7.90g) into the diff. The approximate weight of the diff including oil is 9.40g.

TIPS FOR DIFFERENTIALS

LOW TRACTION MEDIUM TRACTION HIGH TRACTION SUPER-HIGH TRACTION

1.000cSt (HUDY #106410) 2.000cSt (HUDY #106420) 5.000cSt (HUDY #106450) 10.000cSt (HUDY #106510)
2.000cSt (HUDY #106420) 3.000cSt (HUDY #106430) 6.000cSt (HUDY #106460) 11.000cSt (HUDY #106492)
4.000cSt (HUDY #106440) 7.000cSt (HUDY #106470) 12.000cSt (HUDY #106512)
5.000cSt (HUDY #106450) 8.000cSt (HUDY #106480) 15.000cSt (HUDY #106515)
9.000cSt (HUDY #106490) 20.000cSt (HUDY #106520)
10.000cSt (HUDY #106510)

NOTE TIPS FOR FRONT DIFFERENTIAL

SOFTER oil increases rear traction, HARDER oil increases on-power steering and To increase on-power steering and cornering speed, the gear diff can also be used in the front.
stability. It is important not to use soft oils in high-traction conditions as this would NOTE: If you use the gear diff in the front, we recommend using optional
not increase traction, but would make the car loose as the car would become too #304971 HUDY Spring Steel™ outdrives because the stress on the outdrives in the front is
twitchy. much higher than in the rear.

However, if the oil is too soft, it could generate the same effect like the car has no
traction. Therefore it is very important to choose the correct oil very carefully. We USE THESE OILS FOR FRONT DIFFERENTIAL
recommend using softer oil first, then try harder oil to better understand the effect 500.000cSt (HUDY #106650)
on the car’s behavior at the track. Choose the oil accordingly. 1 000.000cSt (HUDY #106692)
2 000.000cSt (HUDY #106694)

To make the front differential tighter, you can use cleaning gum instead of oil.

▶ VIDEO TECH TIP

IMPORTANT!
Using cleaning gum instead of oil in the gear differential can lead to gear breakage because
#104002
HUDY AIR VAC – VACUUM PUMP the gears are working under dry conditions.

To make sure that all the air is removed

from the diff oil, we recommend using the
HUDY AIR VAC DIFF
HUDY Air Vac.
BUILD

After disassembling the gear diff the large O-ring may have an increased size
971240 and may be more difficult to re-install. We recommend either inserting the old
O 24x0.7
O-ring carefully in the diff cover, or installing a new O-ring if the old one cannot
be made to fit properly.

7
 1. GEAR DIFFERENTIAL & FRONT SOLID AXLE

DETAIL

903256
SFH M2.5x6

➊ ➌

➍ ➋

NOTE
ORIENTATION

Tighten the screws equally but do Finish tightening in this order.

NOT tighten them completely.

BEARING OIL OIL

941015 (HUDY #106230) OIL

BB 10x15x4

FRONT SOLID AXLE

#305136
ALU SOLID DRIVESHAFT ADAPTERS

902310 #305137
SH M3x10
STEEL LIGHTWEIGHT SOLID AXLE DRIVESHAFT
ADAPTERS HUDY SPRING STEEL™

941015
BB 10x15x4

OIL

BEARING OIL
(HUDY #106230) OIL

8
 2. CENTRAL TRANSMISSION
303120 902306
303764 OFFSET SPUR GEARS 48P
302960
301960 #305772 72T / 48P OPTION
903304
#305776 76T / 48P OPTION
902306 #305778 78T / 48P OPTION
303120 903305 902306 #305779 79T / 48P OPTION
301550
903305 903306 902306 #305781 81T / 48P OPTION
303759
902305 301550 #305784 84T / 48P OPTION
962042 #305784-O 84T / 48P OPTION
305578
303076 302062 OFFSET SPUR GEARS 64P
305523 305880 #305860 90T / 64P OPTION
305188
970050 #305862 92T / 64P OPTION
930407 #305866 96T / 64P OPTION
902306 902303
902308 902305 #305866-O 96T / 64P OPTION
902306 305578
#305869 99T / 64P OPTION
301550
#305870 100T / 64P OPTION
301550 305578 302062 #305870-O 100T / 64P OPTION
970050 #305874 104T / 64P OPTION
#305876 106T / 64P OPTION
304900 #305878 108T / 64P OPTION
#305880 110T / 64P INCLUDED
302769 305435 #305880-O 110T / 64P OPTION
302062 302062
#305882 112T / 64P OPTION
302768
#305884 114T / 64P OPTION

305435 #305578-O
FIXED PULLEY 20T - GRAPHITE (2)

302768

302769
#302063 or #302063-K
ALU ADJUSTMENT BALL-BEARING HUB (2)

#301007
301006 T4’21 ALU EXTRA-FLEX CHASSIS 2.0MM
T4’21 Alu Flex - SWISS 7075 T6
903305
301005
T4’21 Alu Solid

#183001
301004 HUDY PROFESSIONAL BULKHEAD
T4’21 Graphite 903305 ALIGNMENT TOOL 17MM #305436
HIGH-PERFORMANCE DRIVE BELT
LOW-FRICTION 3x351MM
903305

BAG 301550 ALU UPPER CLAMP WITH 2 ADJ. ROLL-CENTERS (L+R) 902305 HEX SCREW SH M3x5 (10)
301960 ULP GRAPHITE SHOCK TOWER FRONT 3.0MM 902306 HEX SCREW SH M3x6 (10)
02 302062 COMPOSITE ADJUSTMENT BALL-BEARING HUB (4) 902308 HEX SCREW SH M3x8 (10)
302768 ALU LOWER ADJUSTMENT BULKHEAD - FRONT R / REAR L 903304 HEX SCREW SFH M3x4 (10)
302769 ALU LOWER ADJUSTMENT BULKHEAD - FRONT L / REAR R 903305 HEX SCREW SFH M3x5 (10)
302960 ULP GRAPHITE SHOCK TOWER REAR 3.0MM 903306 HEX SCREW SFH M3x6 (10)
303076 ALU BELT TENSIONER BUSHING 930407 BALL-BEARING 4x7x2.5 STEEL SEALED - OIL (2)
303120 SET OF ALU SHIM (0.5MM, 1.5MM, 2.5MM) 962042 WASHER S 4x6x0.1 (10)
303759 ALU MOTOR MOUNT 970050 O-RING 5x1 (10)
303764 ALU CHASSIS BRACE - 7075 T6
304900 XRAY GEAR DIFFERENTIAL - SET
305435 HIGH-PERFORMANCE DRIVE BELT 3x351MM
305188 COMPOSITE SOLID AXLE 38T - SET
305523 ALU SOLID LAYSHAFT WITH BEARINGS
305578 FIXED PULLEY FOR LAYSHAFT WITH BEARINGS 20T (2) 301004 T4’21 GRAPHITE CHASSIS 2.2MM
305880 OFFSET SPUR GEAR 110T / 64 301005 T4’21 ALU SOLID CHASSIS 2.0MM - SWISS 7075 T6
301006 T4’21 ALU FLEX CHASSIS 2.0MM - SWISS 7075 T6
902303 HEX SCREW SH M3x4 SMALL HEAD - STAINLESS (10)

9
 2. CENTRAL TRANSMISSION

903305 DETAIL
SFH M3x5

NOTE
ORIENTATION

NOTE
DETAIL ORIENTATION

#183001
HUDY PROFESSIONAL BULKHEAD ALIGNMENT TOOL 17MM

To align the bulkheads straight, we suggest using

the HUDY Professional Bulkhead Alignment tool.

See page 13

SOLID AXLE

▶ VIDEO TECH TIP

T4 BELT TENSION

#302063 OR #302063-K
ALU ADJUSTMENT BALL-BEARING HUB (2)
GEAR DIFF

#302063 OR #302063-K
ALU ADJUSTMENT BALL-BEARING HUB (2)

10
 2. CENTRAL TRANSMISSION
L=R
FRONT BELT TENSION ADJUSTMENT L=R REAR BELT TENSION ADJUSTMENT
Front solid axle UPPER position - tab in bottom Front solid axle LOWER position - tab in top Rear diff UPPER position - tab in bottom notch - Rear diff LOWER position - tab in top notch - provides
notch - provides more steering, but less front notch - provides more front traction, but provides more on-power steering, but makes the more rear traction (mainly on-power), makes the
traction makes the car push on-power. rear slightly more loose. car more stable in chicanes, but makes the car
push on-power.

Recommended for medium-high traction Recommended for low-traction tracks. Recommended for medium-high traction tracks. Recommended for low-medium traction tracks.
tracks and technical tracks.

LOWER DIFF POSITION

LOWER DIFF POSITION

UPPER DIFF POSITION

UPPER DIFF POSITION

A B A B B A B A

INITIAL POSITION for CARPET/ASPHALT INITIAL POSITION for CARPET/ASPHALT

Place tab in this BOTTOM NOTCH Place tab in this BOTTOM NOTCH

TO LOOSEN FRONT BELT: TO LOOSEN REAR BELT:

Rotate both front nylon hubs in arrow direction A Rotate both rear nylon hubs in arrow direction A

TO TIGHTEN FRONT BELT: TO TIGHTEN REAR BELT:

Rotate both front nylon hubs in arrow direction B Rotate both rear nylon hubs in arrow direction B

1. 2. 3.
NOTE NOTE
ORIENTATION LONG side
902303 ORIENTATION
SH M3x4
SHORT side

970050
O 5x1

NOTE
ORIENTATION
966081
CH-CLIP 8 #966081 CH-CLIP 8 (10)
INCLUDED IN THE LAST AID BAG
NOTE Another alternative to secure the pulley
ORIENTATION
on the layshaft is to use the Clip which is
#966081 CH-CLIP 8 (10) included in the “Last Aid” Bag. To mount the
INCLUDED IN THE LAST AID BAG clip on the layshaft, you have to use special
Another alternative to secure the pulley Snap Ring Pliers.
on the layshaft is to use the Clip which is
included in the “Last Aid” Bag. To mount the
clip on the layshaft, you have to use special Snap Ring Pliers
Snap Ring Pliers.

Snap Ring Pliers OFFSET SPUR GEARS 48P OFFSET SPUR GEARS 64P
DETAIL
#305772 72T OPTION #305860 90T OPTION
#305776 76T OPTION #305862 92T OPTION CUTAWAY VIEW
#305778 78T OPTION #305866 96T OPTION
#305779 79T OPTION #305866-O 96T OPTION
#305781 81T OPTION #305869 99T OPTION
#305784 84T OPTION #305870 100T OPTION
#305784-O 84T OPTION #305870-O 100T OPTION
#305874 104T OPTION
#305578-O
FIXED PULLEY 20T #305876 106T OPTION
GRAPHITE (2) #305878 108T OPTION
#305880 110T INCLUDED
#305880-O 110T OPTION
#305882 112T OPTION NOTE
#305884 114T OPTION ORIENTATION

11
 2. CENTRAL TRANSMISSION

902305
SH M3x5

BEARING OIL
(HUDY #106230)
▶ VIDEO TECH TIP
902308
SH M3x8 OIL

0.1mm

930407
BB 4x7x2.5
BELT TENSIONER

3x8mm 3x5mm

962042
S 4x6x0.1

903305
SFH M3x5

MOTOR MOUNT FLEX ADJUSTMENT

The motor mount is part of the chassis flex adjustment. By adding and removing the screws from the motor mount you get different flex possibilities for different tracks and traction conditions.
NOTE: By removing screws from the motor mount, the spur gear becomes more susceptible to breakage in crashes.

▶ VIDEO TECH TIP FLEX OPTIONS

SOFT MEDIUM STIFF (INITIAL SETTING)

Use only the 3 rearmost screws to attach the motor mount (as Use only the 4 rearmost screws to attach the motor mount (as Using all screws to attach the motor mount (as shown) will give
shown). Do not install the 2 screws immediately in front of & behind shown); do not install the very front screw. This gives a good the best steering response, but with the least mechanical traction.
the spur gear. This allows the chassis to flex more in the central compromise between stability and initial response. The car will have The car will have more cornering speed, but will be more difficult
area, and will improve traction (especially on-power). Rear grip more rear grip than the full stiff setting, but will not be as stable as to drive. Mainly recommended for high-traction carpet conditions.
will be improved through the entire corner, but initial reaction will the soft setting.
decrease. This setting is recommended for low- to medium-traction
conditions, both on carpet and asphalt.

12
2. CENTRAL TRANSMISSION

L=R L=R DO NOT TIGHTEN FULLY

DO NOT TIGHTEN FULLY
902306
SH M3x6

902306
SH M3x6

DO NOT TIGHTEN FULLY

DO NOT TIGHTEN FULLY

FINISH TIGHTENING IN THIS ORDER. FINISH TIGHTENING IN THIS ORDER.

Bulkhead screws (4)

FULLY TIGHTEN Shock tower screws (4)
FULLY TIGHTEN Bulkhead screws (4)
FULLY TIGHTEN Shock tower screws (4)
FULLY TIGHTEN

In order to have perfectly aligned bulkheads, we recommend using the

902306 Hudy Professional Bulkhead Alignment tool.
SH M3x6

#183001
HUDY PROFESSIONAL
BULKHEAD ALIGNMENT
TOOL 17MM

13
 2. CENTRAL TRANSMISSION

DETAIL

303120 NOTE ORIENTATION

SHIM 3x6x0.5
Do not use shims for 0.5mm CHANNEL
initial setting
0.5mm
903304 0.5mm SHIM 0.5mm SHIM
SFH M3x4

903305
SFH M3x5

903306
SFH M3x6

3x5mm
Do not use 3x6mm screws for
initial setting 3x5mm 3x4mm

CHASSIS FLEX ADJUSTMENT

The brace great chassis flex adjustment possibilities depending on which screws are connected

SOFT - WITHOUT BRACE SOFT - MEDIUM MEDIUM (INITIAL SETTING)

If the brace is not installed, the car will have the most Install the brace using only the 2 forward bottom screws Install the brace using the 3 bottom centerline screws
steering and rotation. However, the car will be more (as shown). This gives improved on-power stability but still (as shown). This gives improved on-power stability
▶ VIDEO TECH TIP
difficult to drive as it is less stable. Recommended for offers great off-power steering and rotation. Recommended and traction, but makes the car push more off-power.
medium-high traction conditions and for small, technical for medium-high traction conditions and for small, technical Recommended for low- or high-traction conditions where
tracks with many hairpin corners. tracks with many hairpin corners. stability and traction is needed.

FLEX OPTIONS

STIFF EXTRA STIFF

In addition to all screws used for the “medium” setting, install a front screw at the top; In addition to all screws used for the “stiff” setting, install the 2 rear side screws; ensure
902305
SH M3x5 ensure you insert a 0.5mm shim between the T-brace and the motor mount (as shown). you insert 0.5mm shims between the T-brace and the chassis. This setting gives maximum
This gives improved stability. Recommended for very-high-traction conditions to improve stability.
stability, and also for very-low-traction conditions to generate more traction and stability.

303120
SHIM 3x6x0.5

3x5mm

0.5mm

14
 3. FRONT & REAR SUSPENSION

#303731 ALU LOWER 2-PIECE

SUSPENSION 0.25 ECCENTRIC
HOLDER STAND

#307217 TITANIUM SUSPENSION PIVOT PIN (2)

362315

303173-G 303723 307216

901408 303129

303129
362315
901308

303732 303174-G
903306

302173-G

302723 362315 FRONT ARMS - LONG

303129 #302173-H HARD RIGHT OPTION
302713 901408 #302174-H HARD LEFT OPTION
#302173-G GRAPHITE RIGHT INCLUDED
903306 302174-G
307216 #302174-G GRAPHITE LEFT INCLUDED

303129
REAR ARMS - LONG
#303173-H HARD RIGHT OPTION
362315
901308 #303174-H HARD LEFT OPTION
#303173-G GRAPHITE RIGHT INCLUDED
#303174-G GRAPHITE LEFT INCLUDED

BAG 302173-G FRONT SUSPENSION ARM LONG RIGHT - GRAPHITE 303732 ALU REAR SUSP. HOLDER WITH CENTERING PIN - FRONT (1)
302174-G FRONT SUSPENSION ARM LONG LEFT - GRAPHITE 307216 SUSPENSION PIVOT PIN (2)
03 302713 ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - FRONT - FF 362315 ECCENTRIC BUSHING SET (2)
302723 ALU FRONT LOWER 1-PIECE SUSPENSION HOLDER - REAR - FR
303129 COMPOSITE SET OF WHEELBASE SHIMS (3x1MM; 1x2MM) (2) 901308 HEX SCREW SB M3x8 (10)
303173-G REAR SUSPENSION ARM LONG RIGHT - GRAPHITE 901408 HEX SCREW SB M4x8 (10)
303174-G REAR SUSPENSION ARM LONG LEFT - GRAPHITE 903306 HEX SCREW SFH M3x6 (10)
303723 ALU REAR LOWER 1-PIECE SUSPENSION HOLDER - REAR - RR

2x L=R REAR ARMS REAR ARMS - LONG

#303173-H HARD RIGHT OPTION
#303174-H HARD LEFT OPTION
901308 901408 #303173-G GRAPHITE RIGHT INCLUDED
SB M3x8 SB M4x8 4x8mm
#303174-G GRAPHITE LEFT INCLUDED

3mm

INITIAL SETTING

▶ VIDEO TECH TIP LEFT REAR ARM 3x8mm

REAR LEFT ARM REAR RIGHT ARM

2mm

DOWNSTOPS

15
 3. FRONT & REAR SUSPENSION
2x L=R FRONT ARMS
FRONT ARMS - LONG
901308 #302173-H HARD RIGHT OPTION
SB M3x8
#302174-H HARD LEFT OPTION
#302173-G GRAPHITE RIGHT INCLUDED
4x8mm #302174-G GRAPHITE LEFT INCLUDED
901408
SB M4x8

INITIAL SETTING

3x8mm
FRONT RIGHT ARM

3mm
▶ VIDEO TECH TIP

FRONT RIGHT ARM FRONT LEFT ARM

2.2mm

DOWNSTOPS

REAR SUSPENSION It is extremely important that the arms move freely

on the pivot pins. If they do not, use the Arm Reamer
303129 (3.0mm) to slightly resize the holes in the arms.
SHIM 3x6x1 #303731 ALU LOWER 2-PIECE L=R
SUSPENSION 0.25 ECCENTRIC
HOLDER STAND #107633 HUDY Arm Reamer 3.0mm

903306
SFH M3x6

NOTE
ORIENTATION

NOTE
ORIENTATION L=R Marked
“RR”

ECCENTRIC BUSHINGS

INITIAL SETTING
FOR ASPHALT 1mm

INITIAL SETTING
FOR CARPET
0.5º 1.0º

1mm
NOTE ECCENTRIC BUSHINGS
ORIENTATION #307217
TITANIUM SUSPENSION INITIAL SETTING
FOR ASPHALT
PIVOT PIN (2)

INITIAL SETTING
FOR CARPET
0.5º 1.0º

ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER COMPOSITE ECCENTRIC
BUSHINGS
Middle position = 0.5 mm or 0.5° from center

Outer position = 1mm or 1° from center

Do not use INNER positions. Available positions
The XRAY rear alu lower suspension holders provide even greater range of adjustment for the rear suspension.
Using different combinations of eccentric bushings, fine adjustment of rear squat, rear toe-in, rear roll center, and
rear track-width can be obtained. For more information about the influence of rear squat, rear toe-in, rear roll
center and rear track-width on car handling, please refer to HUDY Set-up Book (#209100).

16
 3. FRONT & REAR SUSPENSION
FRONT SUSPENSION

903306
SFH M3x6

Marked
“FR”
NOTE ORIENTATION

FRONT SUSPENSION
303129
SHIM 3x6x1

NOTE
ORIENTATION
903306
SFH M3x6

ECCENTRIC BUSHINGS
INITIAL SETTING
FOR ASPHALT

INITIAL SETTING
Marked FOR CARPET
“FF” 0.5º 1.0º

1mm

#307217
TITANIUM SUSPENSION
PIVOT PIN (2)

1mm

All possible mounting

alternatives of eccentric bushings
NOTE
ECCENTRIC BUSHINGS ORIENTATION
INITIAL SETTING
FOR ASPHALT
It is extremely important that the arms move freely
INITIAL SETTING on the pivot pins. If they do not, use the Arm Reamer
FOR CARPET (3.0mm) to slightly resize the holes in the arms.
L=R
0.5º 1.0º

#107633 HUDY Arm Reamer 3.0mm

ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.

Middle position = 0.5 mm or 0.5° from center

Outer position = 1mm or 1° from center

The XRAY front alu lower suspension holders provide even greater range of adjustment for the front suspension. Using different combinations of eccentric bushings, fine adjustment of front
anti-squat, front kick-up, front toe-in, front roll center, and front track-width can be obtained. For more information about the influence of front anti-dive, front kick-up, front toe-in, front
roll center and front track-width on car handling, please refer to HUDY Set-up Book.

17
 4. STEERING

#301063
T4’21 GRAPHITE UPPER DECK 1.6MM

902306

#302547 902306
ALU STEERING PLATE 8.5MM FOR DUAL SERVO SAVER - ORANGE
301172

930306

902306

301062

303129

303454 362652
372503
303210
362652 372503
372503
303126 902305

302544
940508
302526
#302590
ALU DUAL SERVO SAVER SCREW M3x7 (2)

940508
302537
302548

303129 903306
302663
#302612-O
372649 903308 ALU ADJ. TURNBUCKLE M3 L/R 39mm
302612
ORANGE - SWISS 7075 T6 (2)

372661

372661
302663
302612
#302610
ADJ. TURNBUCKLE L/R 40mm
#302525 #302525-K HUDY SPRING STEEL™ (2)
ALU DUAL-SERVO SAVER ARM ALU DUAL-SERVO SAVER ARM

BAG 301062 T4’21 GRAPHITE UPPER DECK 2.0MM 362652 BALL END 4.9MM WITH THREAD 10MM (2)
301172 ALU UPPER DECK COLLAR FOR FLEX ELIMINATION 372503 COMPOSITE SERVO SAVER - X-STIFF - SET - V2
04 302526 COMPOSITE DUAL SERVO SAVER ARM 372649 BALL END 4.2MM WITH 4MM THREAD (2)
302537 ALU STEERING POST FOR DUAL SERVO SAVER (2) 372661 COMPOSITE STEERING BALL-JOINT OPEN 4.2 MM (4)
302544 ALU SHIM FOR RADIAL PLAY ADJUSTMENT OF STEERING ARM (2)
302548 ALU STEERING PLATE 8.0MM FOR DUAL SERVO SAVER 902305 HEX SCREW SH M3x5 (10)
302612 ALU ADJ. TURNBUCKLE M3 L/R 39 MM - SWISS 7075 T6 (2) 902306 HEX SCREW SH M3x6 (10)
302663 COMPOSITE BALL JOINT 5 MM - OPEN - V2 (8) 903306 HEX SCREW SFH M3x6 (10)
303126 ALU SHIM 3x6x5.0MM (10) 903308 HEX SCREW SFH M3x8 (10)
303129 COMPOSITE SET OF SHIMS (3x1MM; 1x2MM) (2) 930306 BALL-BEARING 3x6x2.5 STEEL-SEALED - OILED (2)
303210 REAR TURNBUCKLE L/R 26 MM - HUDY SPRING STEEL (2) 940508 BALL-BEARING 5x8x2.5 RUBBER-SEALED - OILED (2)
303454 BALL JOINT 4.9MM - OPEN (4)

18
 4. STEERING
NOTE ORIENTATION
Long side = Ball joint open
SERVO LINK
Adjust servo link to fit your servo
2x STEERING LINKS
#302612-O #302610
ALU ADJ. TURNBUCKLE M3 ADJ. TURNBUCKLE L/R 40mm
HUDY SPRING STEEL (2) THREAD
THREAD L/R 39mm ORANGE - SWISS
THREAD 7075 T6 (2) THREAD

2x L=R

26mm
approx. 17mm

5x8x2.5mm
#302547
OIL
ALU STEERING PLATE 8.5MM FOR DUAL SERVO SAVER - ORANGE
903308
SFH M3x8
Optional 8.5mm alu steering plate improves steering response, but makes the car
more difficult to drive in chicanes. Recommended for small, technical tracks, or
BEARING OIL tracks with many hairpin corners.
(HUDY #106230)
930306
BB 3x6x2.5
OIL

3x6x2.5mm
940508
BB 5x8x2.5
#302525 #302525-K
ALU DUAL SERVO SAVER ARM ALU DUAL SERVO SAVER ARM
NOTE
ORIENTATION

Tighten the screws gently but fully, and then loosen 1/3
turn so the composite dual-servo saver moves freely. We recommend using the aluminum dual-servo saver arms when better steering
response is needed. Also recommended for asphalt tracks.
▶ VIDEO TECH TIP ➊ Tighten fully
➋ Loosen 1/3 ccw
➌ Check free movement

HOW TO BUILD A PLAY (120° CCW)

FREE STEERING

2x L=R
NOTE ORIENTATION
Ball joint open

303129
SHIM 3x6x1

NOTE ORIENTATION
(outside)
To change Ackermann angle, use 2 identical
4mm THREAD shims (of same thickness) between the alu
INITIAL SETTING (1mm shim) steering plate and ball ends.

▶ VIDEO TECH TIP NOTE ORIENTATION

(outside)
Install the pivot balls with Professional
1mm 1mm 1mm 2mm
Multi Tool (HUDY #183011)
NOTE ORIENTATION
Ball joint open

HUDY MULTI-TOOL USE

19
 4. STEERING

303129
SHIM 3x6x2

H = (24T)
F = (25T)
303126 2mm K = (23T)
SHIM 3x6x5 10mm 2mm
THREAD

10mm THREAD

5mm

▶ VIDEO TECH TIP INITIAL SETTING

3x6x2mm When using optional #302525-K or #302525

3x7.5x1.5mm aluminum steering arms, we suggest using
STEERING SYSTEM optional shims.
3x7.5x1.5mm
SET-UP
#303134-K (3x7.5x1.5mm)
#303123-K (3x6x2mm)

When you want to eliminate steering lock in

high-traction conditions.

For more in-corner steering and better steering response, aluminum servo horns may be used.
ALU SERVO HORNS - OFFSET HUDY ALU SERVO HORNS HUDY ALU SERVO HORNS
#293491 KO, Sanwa - 23T #293497 KO, Sanwa - 23T #293501 KO, Sanwa - 23T
#293492 Hitec - 24T #293498 Hitec - 24T #293502 Hitec - 24T
#293493 Futaba - 25T #293499 Futaba - 25T #293503 Futaba - 25T
CLAMP ALU SERVO HORNS - OFFSET HUDY CLAMP ALU SERVO HORNS HUDY CLAMP ALU SERVO HORNS
#293401 KO, Sanwa - 23T #293404 KO, Sanwa - 23T #293407 KO, Sanwa - 23T
#293402 Hitec - 24T #293405 Hitec - 24T #293408 Hitec - 24T
#293403 Futaba - 25T #293406 Futaba - 25T #293409 Futaba - 25T
IMPORTANT!
When an aluminum horn is used, the steering servo saver is not used. This increases the risk of breaking the servo in serious crashes.

#302590
ALU DUAL SERVO SAVER SCREW M3x7 (2)
902305
SH M3x5

The optional screw removes excessive radial play

903306 of the steering.
SFH M3x6

▶ VIDEO TECH TIP

HOW TO BUILD A PLAY

FREE STEERING

20
 4. STEERING

TOP DECK FLEX SETTINGS

The new feature of the top deck is the flex setting adjustment.
902306
SH M3x6 There are three different flex setting alternatives.

SOFT MEDIUM STIFF

(INITIAL SETTING)
930306
BB 3x6x2.5

▶ VIDEO TECH TIP

No bushing or bearing is used. This allows The top deck is connected to the motor mount via The top deck is connected to the motor mount via
maximum flex and provides maximum steering. ball bearing. This setting eliminates a bit of steering bushing. This setting provides maximum stability as
However, the car is less stable on-power. but improves stability. it stiffens the entire car and eliminates flex to sides
FLEX OPTIONS and front/rear.

STIFF
INITIAL SETTING

MEDIUM

#301063
T4’21 GRAPHITE TOP DECK 1.6MM

We recommend using optional 1.6mm top deck for super-low traction conditions or in combination with
aluminum chassis as it provides more overall traction and steering.

21
 5. FRONT & REAR TRANSMISSION

DRIVE SHAFTS 901304 STEERING BLOCKS

930306
#305323 50mm STEEL 303455 #302252 MEDIUM OPTION
362648 303803 901302
#305324 52mm STEEL #302253 HARD INCLUDED
#305326 52mm ALU #302254 GRAPHITE OPTION 303433
303457
#305332 52mm ECS
#305333 50mm ECS 303455
901302 901304 362648
302814
#309002 303457
SET OF CERAMIC
BALL-BEARINGS 303433
(14) 303212
930306
302663
901302
362649 362652
303122
303127
302363-M
303354
307321 305328
980210 940510
305392
305241
901302 305341
940510 901304 902205
302663 305231 305350-K
303212

307221 362649 362652 #302202

305241 901302 ALU STEERING BLOCKS WITH GRAPHITE
362651
305253 303123 EXTENSION PLATES - SET
303123
305254 980210
301391
305224 305346
302253
901305 302291
305394 902205
305253 302364-M
901302 940510 305350-K
940510 902303 902310 901304

#303210 TURNBUCKLE M3 L/R 26mm #305409 CVD BB DRIVE SHAFT 50mm - SET - UPRIGHTS
HUDY SPRING STEEL™ (2) HUDY Spring Steel™ #303352 0° 2-HOLE MEDIUM OPTION
#305409 #303354 0° 2-HOLE HARD INCLUDED
#303360 0° 2-HOLE GRAPHITE OPTION
#303212-O ALU TURNBUCKLE L/R #304972
26mm ORANGE - SWISS 7075 T6 (2)

C-HUBS
#305308 ECS BB DRIVE SHAFT 52mm - SET
#305242 DRIVE SHAFT REPLACEMENT
#305309 ECS BB DRIVE SHAFT 53mm - SET #302363-M 4° RIGHT MEDIUM INCLUDED
CAP 3.5MM - ORANGE - STRONG (4)
#305308 #302364-M 4° LEFT MEDIUM INCLUDED
#305138 #305309 #302383-G 4° RIGHT GRAPHITE OPTION
#307222 TITANIUM FRONT ARM PIVOT PIN (2)
#307322 TITANIUM REAR ARM PIVOT PIN (2) #302384-G 4° LEFT GRAPHITE OPTION

301391 GRAPHITE BODY UPSTOP 2.0MM (2) 305332 ECS ES (ES) DRIVE SHAFT 52MM - HUDY SPRING STEEL™ - SET
BAG
302253 COMPOSITE STEERING BLOCK - HARD 305341 DRIVE AXLE - LIGHTWEIGHT - HUDY SPRING STEEL™
302291 STEEL STEERING BUSHING (2+2) 305346 ECS DRIVE AXLE FOR 2MM PIN - HUDY SPRING STEEL™
05 302363-M COMPOSITE C-HUB FOR BODY UPSTOP RIGHT - 4° DEG. - MEDIUM 305350-K ALU WHEEL HUB - BLACK (2)
302364-M COMPOSITE C-HUB FOR BODY UPSTOP LEFT - 4° DEG. - MEDIUM 305392 DRIVE SHAFT PIN 2 x 10 WITH FLAT SPOT (2)
302663 COMPOSITE BALL JOINT 4.9MM - OPEN - V2 (8) 305394 ECS DRIVE SHAFT PIN 2 x 9 WITH FLAT SPOT (2)
302814 T4’20 ANTI-ROLL BAR FOR BALL-BEARINGS - FRONT 1.4 MM 307221 FRONT ARM PIVOT PIN (2)
303122 ALU SHIM 3x6x1.0MM (10) 307321 REAR ARM PIVOT PIN (2)
303123 ALU SHIM 3x6x2.0MM (10) 362648 BALL END 4.9MM WITH THREAD 4MM (2)
303127 ALU SHIM 3x6x4.0MM (10) 362649 BALL END 4.9MM WITH THREAD 5MM (2)
303212 ALU ADJ. TURNBUCKLE M3 L/R 26 MM - SWISS 7075 T6 (2) 362651 BALL END 4.9MM WITH THREAD 8MM (2)
303354 COMPOSITE UPRIGHT 0° OUTBOARD TOE-IN - HARD 362652 BALL END 4.9MM WITH THREAD 10MM (2)
303433 ALU ANTI-ROLL BAR BUSHING - 6MM (2)
303455 COMPOSITE ANTI-ROLL BAR BALL JOINT 4.9 MM (4) 901302 HEX SCREW SB M3x2.5 (10)
303457 BALL JOINT 4.9MM - EXTRA SHORT OPEN (4) 901304 HEX SCREW SB M3x4 (10)
303803 ANTI-ROLL BAR FOR BALL BEARINGS - REAR 1.3 MM 901305 HEX SCREW SB M3x5 (10)
305224 ECS (ES) DRIVE SHAFT 52MM FOR 2MM PIN - HUDY SPRING STEEL™ (1) 902205 HEX SCREW SH M2x5 (10)
305231 DRIVE SHAFT COUPLING - HUDY SPRING STEEL™ 902303 HEX SCREW SH M3x4 SMALL HEAD - STAINLESS (10)
305241 DRIVE SHAFT REPLACEMENT CAP 3.5 MM (4) 902310 HEX SCREW SH M3x10 (10)
305253 ECS DRIVE SHAFT COUPLING FOR 2MM PIN - HUDY SPRING STEEL™ 930306 BALL-BEARING 3x6x2.5 STEEL-SEALED - OILED (2)
305254 ECS (ES) DRIVE SHAFT CASE FOR 2MM PIN - HUDY SPRING STEEL™ 940510 BALL-BEARING 5x10x4 RUBBER SEALED - OIL (2)
305328 ALU DRIVE SHAFT SWISS 7075 T6 - HARDCOATED - 50MM 980210 PIN 2x10 (10)

22
 5. FRONT & REAR TRANSMISSION
2x REAR TRANSMISSION 2x FRONT TRANSMISSION
901302
SB M3x2.5
DO NOT OVERTIGHTEN TL
THREAD LOCK

TL
THREAD LOCK
305392 GRAPHITE GREASE
P 2x10
(HUDY #106210)
GRAPHITE GREASE
(HUDY #106210)
305394 2x10mm
P 2x9

2x9mm
DETAIL STEP Set-screw against
the flat spot.

Set-screw against the flat spot. TL

▶ VIDEO TECH TIP THREAD LOCK

TIP
#305242
For easy installation of the
DRIVE SHAFT REPLACEMENT CAP
#305241 plastic caps, use pliers
3.5MM ORANGE - STRONG (4)
as shown.

ECS DRIVE SHAFT

MAINTENANCE DRIVE SHAFTS Longer drive shafts (52mm) make the car easier to drive because they give more traction and better stability, mainly in chicanes.
#305323 50MM - STEEL However, the car will understeer more than with shorter (50mm) shafts which give a lot of steering and make the car more aggressive.
Both left & right shafts should ALWAYS be the same length at one end of the car (front or rear).
#305324 52MM - STEEL
#305326 52MM - ALU 52mm shafts are recommended for carpet high-traction tracks.
#305334 51MM - ECS 51mm shafts are recommended for carpet tracks and large asphalt tracks.
#305333 50MM - ECS 50mm shafts are recommended for low-traction or tight asphalt tracks.

#305409 #305308 ECS BB DRIVE SHAFT 52mm - SET

CVD BB DRIVE SHAFT 50mm - SET - HUDY Spring Steel™ #305309 ECS BB DRIVE SHAFT 53mm - SET

#305308
#305409 #305309
#304972 #305138
▶ VIDEO TECH TIP

The CVD bearing driveshafts improve off-power steering and rotation, but decrease The optional ECS ball-bearing driveshafts feature a new ball-bearing assembly
rear traction and stability. Recommended for use in high-traction conditions, and for at the inner end of the driveshaft where it inserts into the outdrive. They offer
tracks with many hairpin corners. a significant performance improvement over the standard blade-type driveshafts.
The new ball-bearing driveshafts must be used with optional: The friction between the driveshaft and the outdrive is greatly reduced, which gives
BEARING ECS DRIVE
#304972 GEAR DIFF CVD BB DRIVESHAFT OUTDRIVES much smoother handling especially on fast direction changes such as chicanes. The
SHAFTS
reduced friction also helps to increase cornering speeds. The new ball-bearing
driveshafts must be used with optional #305138 SOLID AXLE ECS BB DRIVESHAFT
ADAPTERS.
We recommend the shorter 52mm shafts for smaller, more technical tracks, where
more initial steering is needed.
The 53mm shafts are best suited for more open and flowing track layouts. They will
provide slightly less initial steering, but better steering in the middle of the corner,
as well as on power.

L=R REAR TRANSMISSION

902205
SH M2x5 2x L=R Left UPRIGHT = Right UPRIGHT

0° OUTBOARD TOE-IN UPRIGHTS

940510
BB 5x10x4

UPRIGHTS
980210 Use Alu 50mm Drive Shafts in rear #303352 0° 2-HOLE MEDIUM OPTION
OIL
P 2x10
BEARING OIL #303354 0° 2-HOLE HARD INCLUDED
(HUDY #106230) #303360 0° 2-HOLE GRAPHITE OPTION

23
 5. FRONT & REAR TRANSMISSION
L=R 2x FRONT TRANSMISSION
902205
SH M2x5

Use Steel 51mm ECS

Drive Shafts in front

ALU OFFSET WHEEL HUBS

940510 OIL
#305350-K 0mm INCLUDED
BB 5x10x4
BEARING OIL
(HUDY #106230) #305351 -0.75mm OPTION
#305352 +0.75mm OPTION
980210
P 2x10 #302202 #305353 +1.5mm OPTION
ALU STEERING BLOCKS
WITH GRAPHITE STEERING BLOCKS
EXTENSION PLATES - SET
#302252 MEDIUM OPTION
#302253 HARD INCLUDED
#302254 GRAPHITE OPTION

The NEW FEATURE of the T4'21 car is the body upstops system. NOTE:
Before mounting the steering block, use the
2x CA Glue hobby knife to remove the excessive composite
309319 901305 L=R
3x7x3mm material from the inside window of the c-hub.
SHIM 3x7x3 SB M3x5
3x5mm

902305 902303
SH M3x5 SH M3x4

3x4mm

We recommend using the composite shim to create a bigger The set-screw is used to help center the graphite IMPORTANT:
▶ VIDEO TECH TIP surface that touches the body; this will help prevent paint upstop, whereas the button-head screw is used to adjust Make sure that neither the set-screw nor screw protrude
from being removed from the inside of the bodyshell. Before the height of the upstop. It is important to have both into the open cavity in the C-hub. If either screws are
inserting the screw, use CA glue to seal & strengthen the left & right upstops be the same height. protruding inside, the ECS drive shafts may touch them
outside edges of the upstop. which could bind the entire suspension while turning.
Insert the screw carefully. To check that both left & right upstop heights are the
same, measure the distance between the top of the set-
screw and the top of the slot in each graphite upstop.
BODY UPSTOPS

FRONT TRANSMISSION
2x SHORT C-HUBS
L=R
#302363-M 4° RIGHT MEDIUM INCLUDED
#302364-M 4° LEFT MEDIUM INCLUDED
#302383-G 4° RIGHT GRAPHITE OPTION
902310
SH M3x10 #302384-G 4° LEFT GRAPHITE OPTION
RIGHT C-HUB
marked 4R

LONG

4x
2x L=R 2x L=R

THREAD FRONT LEFT = FRONT RIGHT REAR LEFT = REAR RIGHT

THREAD
55.5mm 53.5mm

#303210 TURNBUCKLE M3 L/R 26mm #303212-O ALU TURNBUCKLE L/R

HUDY SPRING STEEL™ (2) 26mm ORANGE - SWISS 7075 T6 (2)

24
 5. FRONT & REAR TRANSMISSION
L=R REAR SUSPENSION Install the pivot balls with Professional
Multi Tool (HUDY #183011)
The information about the optional Active Rear
303122 Suspension is at the end of the manual.
SHIM 3x6x1

LEFT UPRIGHT = RIGHT UPRIGHT 53.5

mm
L=R
303127
SHIM 3x6x4
5mm THREAD
1mm
901304
SB M3x4
10mm THREAD

4mm
INITIAL SETTING

▶ VIDEO TECH TIP

25mm TIGHTEN GENTLY
L=R 2x

1:1 2x L=R
#307322
INITIAL SETTING TITANIUM REAR ARM PIVOT PIN (2)
HUDY MULTI-TOOL USE

2x L=R FRONT SUSPENSION

55.5
mm L=R 2x
303123
SHIM 3x6x2

INITIAL SETTING
901304
SB M3x4 5mm THREAD

2mm
10mm THREAD Install the pivot balls with Professional
Multi Tool (HUDY #183011)

2mm

#307222 23mm
TITANIUM FRONT ARM PIVOT PIN (2) TIGHTEN GENTLY

1:1 2x

25
 5. FRONT & REAR TRANSMISSION
2x L=R

Install the pivot balls with Professional 8mm THREAD

Multi Tool (HUDY #183011)

L=R FRONT TRANSMISSION INITIAL SETTING

FREE MOVEMENT

L=R

FREE MOVEMENT

RECOMMENDED BUMPSTEER SETTINGS:

CARPET - none shim

ASPHALT - 2mm thick shim
CARPET - none shim
ASPHALT - 2mm shim The number of shims changes the angles of the steering linkage.
When no shims are used, the car is easy to drive into the corner. As
the number of shims is increased, in-corner steering increases but
the car becomes more difficult to drive.

4x 4x

Install the pivot balls with Professional

18mm

Multi Tool (HUDY #183011)

2.0 m
m
4mm THREAD

2x FRONT ANTI-ROLL BARS

REAR ANTI-ROLL BARS
BEARING OIL #302812 FRONT 1.2mm
#303801 REAR 1.1mm
OIL (HUDY #106230)
930306 #303802 REAR 1.2mm #302813 FRONT 1.3mm
BB 3x6x2.5
INCLUDED #303803 REAR 1.3mm INCLUDED #302814 FRONT 1.4mm
#303804 REAR 1.4mm #302815 FRONT 1.5mm
#303805 REAR 1.5mm
#303806 REAR 1.6mm
BEARING OIL
OIL (HUDY #106230)

26
 5. FRONT & REAR TRANSMISSION
FRONT ANTI-ROLL BAR
DETAIL

L=R

FRONT ANTI-ROLL BAR

901302
SB M3x2.5
3x4mm

901304
SB M3x4

3x2.5mm
3x4mm

3x2.5mm

DETAIL
CENTER

▶ VIDEO TECH TIP

Set the bar into the center, remove the play in the bushings, and
ANTI-ROLL BARS tighten the set-screws fully.

When the bars are set, verify that If both sides still do not
both sides move at the same time. move at the same time,
If they do, the bars are set up adjust the length of the
correctly. If not, make sure that bar holders.
both downstops are the same and
that the bar wire is flat.

27
 5. FRONT & REAR TRANSMISSION
REAR ANTI-ROLL BAR
2x L=R
INITIAL POSITION

OUTER INNER

ANTI-ROLL BAR POSITION

INITIAL SETTING = OUTER BALL
Use the OUTER ball on medium-high
traction tracks. The car will roll less which
will make it easier to drive with more
cornering speed.
Use the INNER ball on low-traction
tracks (mainly low-traction carpet
tracks). The car will have more traction &
more steering, but will be more difficult
to drive because the car will roll more.

REAR ANTI-ROLL BAR

CENTER
DETAIL

901302 3x4mm
SB M3x2.5

901304
SB M3x4
3x2.5mm
3x4mm
3x2.5mm

Set the bar into the center, remove the play in the bushings, and
tighten the set-screws fully.

▶ VIDEO TECH TIP

If both sides still do not
When the bars are set, verify that both
move at the same time,
sides move at the same time. If they
adjust the length of the
do, the bars are set up correctly. If not,
bar holders.
make sure that both downstops are the
same and that the bar wire is flat.
ANTI-ROLL BARS

28
 6. SHOCK ABSORBERS

#104002
XRAY SPRINGS
HUDY AIR VAC – VACUUM PUMP - ON-ROAD
#308263 C = 2.3-2.6 OPTION
#308264 C = 2.5-2.8 INCLUDED
#308274 C = 2.3 OPTION
#308275 C = 2.5 OPTION
308354-K #308286 C = 2.6 INCLUDED
#308276 C = 2.7 OPTION
#308288 C = 2.8 OPTION
308092 #308277 C = 2.9 OPTION
(OPTION) #308290 C = 3.0 OPTION
965023
308334
303241 965023
308082

308037 308324
4 holes 3 holes 308364

1.1 1.1 308037

1.2 1.2
1.3 1.3 970131
972030

308327-K
#308308-O
ULP ALU SHOCK ABSORBER-SET - ORANGE (2) 308264 FRONT
308286 REAR

308044-K 308334

308316

303241
#308031-O
ALU XRAY SHOCK SPRING RETAINING COLLAR - ORANGE (4)

#308029
#308031-K
ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)
ALU XRAY SHOCK SPRING RETAINING COLLAR - BLACK (4)
Progressive shock system for touring cars for improved traction
and steering characteristics. Shock insert with 3 triangular cutouts
used with piston WITHOUT holes. The hardness of the shock is
influenced not by the holes in the piston, but rather by the insert.

303241 BALL UNIVERSAL 5.8 MM HEX (4) 308354-K ULP ALU SHOCK CAP-NUT WITH VENT HOLE - BLACK (2)
BAG 308037 COMPOSITE PISTONS 4-HOLE 1.0-1.2MM, 3-HOLE 1.0-1.2MM 308364 T4 HARDENED SHOCK SHAFT FOR ALU SHOCKS (2)
308044-K ULP ALU SHOCK ADJUSTABLE NUT - BLACK (2)
308082 T4 SHOCK ABSORBER MEMBRANE (4) 965023 E-CLIP 2.3 (10)
308092 T4 SHOCK FOAM INSERTS (4) (OPTION) 970131 O-RING 13 x 1.0 (10)
308308-K ULP ALU SHOCK ABSORBER-SET - BLACK (2) 972030 SILICONE O-RING 3 x 2 (10)
308316 SHOCK BALL JOINT - OPEN (4)
308324 ULP ALU SHOCK BODY (2) 308264 XRAY 4S SPRING-SET PROGRESSIVE C=2.5-2.8 (2)
308327-K ALU CAP FOR XRAY SHOCK BODY - BLACK 308286 XRAY 4S SPRING-SET C=2.6 (2)
308334 ULP COMPOSITE SHOCK PARTS

965023
C 2.3

4 holes Ø1.1mm
INITIAL SETTING

29
 6. SHOCK ABSORBERS

SHOCK OIL

NOTE
972030 ORIENTATION
O 3x2

SHOCK
SHOCK OIL OIL

SHOCK OIL CUTAWAY VIEW

DETAIL

➊
➋
970131 SHOCK OIL
O 13x1.0

Be careful not to cross-thread the collar on the shock body.

Install the ball joint with Professional NOTE!

Multi Tool (HUDY #183011) Set this distance to 8.5mm when DETAIL

using PSS system in front shocks.

9mm
INITIAL SETTING

INCORRECT

DETAIL

HINT: Pre-thread the ball joint using an M3 screw.

CORRECT WARNING! Be careful not to pre-thread too far, since the ball joint may
split or the plastic threads may strip out.

OIL 450cSt SHOCK FILLING #104002

➊ Fully extend the piston rod so HUDY AIR VAC – VACUUM PUMP
the piston is at the bottom of
the shock body.

➋ Hold the shock upright and

▶ VIDEO TECH TIP slightly overfill the shock body
with shock oil.
SHOCK OILS (50ml) #106352 525cSt OPTION
➌ Let the oil settle and allow
#106325 250cSt OPTION #106355 550cSt OPTION
air bubbles to rise to the top.
Slowly move the piston up #106330 300cSt OPTION #106357 575cSt OPTION
and down to allow oil into all #106335 350cSt OPTION #106360 600cSt OPTION
cavities within the shock body.
HUDY AIR VAC SHOCK #106337 375cSt OPTION #106362 625cSt OPTION
BUILD ➍ Extend the piston rod most #106340 400cSt OPTION #106365 650cSt OPTION
of the way out of the shock #106367 675cSt OPTION
#106342 425cSt OPTION
body. Let the shock rest for 5
minutes to allow the air bubbles #106345 450cSt INCLUDED #106370 700cSt OPTION
to escape. #106347 475cSt OPTION #106375 750cSt OPTION To make sure that all the air is removed
#106350 500cSt OPTION #106380 800cSt OPTION from the shock oil, we recommend
➎ Add shock oil as necessary. using the HUDY Air Vac.

After you insert the

Foam insert DETAIL
membrane, ensure that
(OPTION)
it is fully seated inside
the alu cap.

CUTAWAY VIEW

30
 6. SHOCK ABSORBERS

➊ When installing the shock cap assembly on the

shock body, some oil will leak out... this is normal.

➋ Tighten the cap and clean off any excess oil.

➌ After the shock is assembled, the shock rod will

push itself out of the shock body fairly quickly.

➍ Follow the next procedure to adjust the rebound.

REBOUND ADJUSTMENT REBOUND CHECK

RELEASE 2-3 turns TIGHTEN FULLY
➊ ➋ ➌

50%
25%
75%

0%

100%

AFTER THE SHOCK IS ASSEMBLED YOU HAVE TO SET THE SHOCK REBOUND: REBOUND CHECK:

It is very important to push the shock shaft into the shock body slowly otherwise air can come into the shock body
➊ Release the shock cap by 2-3 turns.
which would create bubles.
➋ Push the shock shaft fully up. For the first time the extra oil will release through
100% rebound - do not do step 2 and 3
the hole in the alu cap-nut.
75% rebound - repeat steps 1 to 3 until the shock shaft will push out 75% of its length
➌ Tighten the shock cup. When tightening the shock cap, extra oil will again release 50% rebound - repeat steps 1 to 3 until the shock shaft will push out 50% of its length
through the hole in the alu cap - nut. When tightening, the shock shaft will push 25% rebound - repeat steps 1 to 3 until the shock shaft will push out 25% of its length
out from the shock body. 0% rebound - repeat steps 1 to 3 until the shock shaft will push out 0% of its length

If the shock shaft does not rebound enough, you will have to refill the shock with shock oil, and then repeat the
bleeding and rebound adjustment procedure.

SHOCK LENGTH ADJUSTMENT: #308031-O

ALU XRAY SHOCK SPRING RETAINING COLLAR - ORANGE (4)
It is VERY IMPORTANT that all shocks are equal length.

Fully extend the shock absorber and measure the end-to-end length; we
recommend using digital calipers to give an accurate measurement. If a shock
absorber is shorter or longer than others, adjust the shock length by tightening
or loosening the ball joint on the shock rod.
#308031-K
ALU XRAY SHOCK SPRING RETAINING COLLAR - BLACK (4)

▶ VIDEO TECH TIP

ASSEMBLY VIEW

Install the balls with Professional Multi

Tool (HUDY #183011)

SHOCK & SPRINGS

CHOICES

31
 7. FRONT & REAR ASSEMBLY
902312
REAR BODY MOUNT SET
#301336 0mm INCLUDED
301207
#301337 +1mm OPTION
301219 #301338 +2mm OPTION
303129
902310 308308-K 301231
FRONT BODY MOUNT SET
#301322 0mm INCLUDED
303129 #301323 +1mm OPTION
902310 #301324 +2mm OPTION

FRONT ECC. BODY MOUNT SET

#301326 0mm INCLUDED
303129 #301327 +1mm OPTION
#301328 +2mm OPTION
981212
301322
#301351-O
ALU ADJUSTABLE BODY POST STOP (2)
301322

960030
981212 301325

301204 #301210
301326
GRAPHITE UPPER HOLDER FOR
BUMPER 2.5MM
903310

903308

903310
#301232
T4 FOAM BUMPER WIDE - HARD

902308 301336

308308-K 902312
306219
902308 301390
301336
306219

902312
306219
981212

301390
306219 981212

BAG 301204 COMPOSITE BUMPER 902308 HEX SCREW SH M3x8 (10)

301207 COMPOSITE BUMPER UPPER HOLDER BRACE 902310 HEX SCREW SH M3x10 (10)
07 301219 COMPOSITE UPPER HOLDER FOR BUMPER 902312 HEX SCREW SH M3x12 (10)
301322 FRONT BODY MOUNT SET 903308 HEX SCREW SFH M3x8 (10)
301326 FRONT ECCENTRIC BODY MOUNT SET 903310 HEX SCREW SFH M3x10 (10)
301325 T4 COMPOSITE BRACE FOR BUMPER - LOW (2) 960030 NUT M3 (10)
301336 REAR BODY MOUNT SET 981212 PIN 2x12 (10)
301390 GRAPHITE ADJ. SHIM FOR REAR BODY POST 3.0MM (2)
303129 COMPOSITE SET OF WHEELBASE SHIMS (3x1MM; 1x2MM) (2) 301231 T4 FOAM BUMPER - LIGHT & STRONG
306219 COMPOSITE SET OF SERVO SHIMS (4)
308308-K ULP ALU SHOCK ABSORBER-SET - BLACK (2)

32
 7. FRONT & REAR ASSEMBLY

BODY POST ORIENTATION

903308
SFH M3x8

903310
SFH M3x10

960030
N M3

REARWARD CENTER FRONTWARD

(INITIAL SETTING)

3x10mm

3x10mm

It is important to use the same body setting

3x10mm (rearward, center, frontward) on both front and
rear body posts at the same time.
3x10mm
3x8mm

This new, innovative & unique feature allows adjustment of the body position for all kind of surfaces, traction conditions, touring classes, using only one body. There are
three different body positions; rearward, center, and forward. Depending on the conditions the body post positions can be easily changed which allows the body to be moved.

• The body in the REARWARD POSITION makes the car super stable and very easy to drive. It makes the car easier to drive in chicanes and more predictable in high-traction
conditions.

• The body in the CENTER POSITION makes the car more aggressive and steer faster, but is a bit more difficult to drive in low-grip conditions.

• The body in the FORWARD POSITION is the most aggressive. It makes the car steer a lot, but is more difficult to drive when the traction is high or when the track has a
lot of chicanes.

#301210
DETAIL
GRAPHITE UPPER HOLDER FOR BUMPER 2.5mm
(Alu shim 4x6x2mm - INCLUDED)

902312
SH M3x12

INITIAL SETTING

#301232
T4 FOAM BUMPER WIDE - HARD
ALU SHIM 4x6x2mm

33
 7. FRONT & REAR ASSEMBLY
2x L=R #301351-O
ALU ADJUSTABLE BODY POST STOP (2)
981212
P 2x12

Very handy, easily externally adjustable body

post made from Swiss 7075 T6 aluminum. Allows
for adjustment of body height by 3mm without
needing to change the position on the body post.

FRONT ECC. BODY MOUNT SET

#301326 0mm INCLUDED
#301327 +1mm OPTION
#301328 +2mm OPTION

FRONT BODY MOUNT SET

#301322 0mm INCLUDED
#301323 +1mm OPTION
#301324 +2mm OPTION

INITIAL SETTING
SLP SHOCK ABSORBER PARTS

DETAIL
For some very specific racing conditions like extreme-
ly-low traction, these SLP shocks with SLP Shock Tow-
er are available. Also optional SLP Alu Progressive
902310
SH M3x10 Shock System Set for improved traction is available.
Please note that all these part are only for optional
SLP shock absorbers and cannot be combined with
ULP shock absorber parts.
303129
SHIM 3x6x1

#301962
2mm SLP SHOCK TOWER FRONT 3.0MM GRAPHITE
2mm
303129
SHIM 3x6x2

1mm
#308307-O or #308307-K
SLP ALU SHOCK ABSORBER - SET (2)

FRONT SHOCK SPRING

C=2.5-2.8

More information about optional lower

shock tower is at the end of the manual.

▶ VIDEO TECH TIP

#308039
SLP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)
#308029
ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)

SHOCK SHIMMING The progressive shocks improve traction and steering characteristics.
TUTORIAL This ULP progressive system directly fits the ULP shocks in the kit.

34
 7. FRONT & REAR ASSEMBLY

L=R
BODY POST POSITION

902312
SH M3x12

FRONTWARD CENTER REARWARD

(INITIAL SETTING)
981212
P 2x12

It is important to use the same body setting (rearward,

center, frontward) both on front and rear body posts
at the same time.

#301351-O REAR BODY MOUNT SET

ALU ADJUSTABLE BODY POST STOP (2)
#301336 0mm INCLUDED
Very handy, easily externally adjustable body post made from
Swiss 7075 T6 aluminum. Allows for adjustment of body height #301337 +1mm OPTION
by 3mm without needing to change the position on the body post. #301338 +2mm OPTION

INITIAL SETTING
SLP SHOCK ABSORBER PARTS
902308
SH M3x8 DETAIL
For some very specific racing conditions like
extremely-low traction, these SLP shocks with SLP
Shock Tower are available. Also optional SLP Alu
Progressive Shock System Set for improved traction
306219 is available. Please note that all these part are only
SHIM 3x6x1 for optional SLP shock absorbers and can not be
combined with ULP shock absorber parts.

#302962
306219 SLP SHOCK TOWER REAR 3.0MM GRAPHITE
SHIM 3x6x2 2mm

1mm
REAR SHOCK SPRING
C=2.6
#308307-O or #308307-K
SLP ALU SHOCK ABSORBER - SET (2)

The information about optional lower shock

tower is at the end of the manual.

▶ VIDEO TECH TIP #308039

SLP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)
#308029
ULP ALU PROGRESSIVE SHOCK SYSTEM - SET (2)

SHOCK SHIMMING The progressive shocks improve traction and steering characteristics.
TUTORIAL This ULP progressive system directly fits the ULP shocks in the kit.

35
 7. FINAL ASSEMBLY
Motor Receiver Speed Controller
(NOT INCLUDED) (NOT INCLUDED) (NOT INCLUDED)

903306
296510 903306 306234
306310
306301
303126 306201
305912~306000
(NOT INCLUDED) 903310 903308
902308
Steering Servo
303126 306204 (NOT INCLUDED)
309402
296510
Servo Screw
(NOT INCLUDED)
903310
903306 902306
902320

326176

901305 #306410
960140
ALU FAN MOUNT
306192

306192

306190 #306195
903310 ALU FULLY ADJ. BATTERY HOLDER
Wheels & Tires & Inserts + WEIGHT FOR SHORT BATTERIES
LiPo Battery Pack
(NOT INCLUDED) 960140 (NOT INCLUDED)

#306165 #306551
GRAPHITE BATTERY STRAP XRAY PURE TUNGSTEN
ALU REAR WING SHIM
CHASSIS WEIGHT 11g
#353561 SILVER XRAY OPTION
#293561 SILVER HUDY OPTION
#293561-O ORANGE HUDY OPTION

BAG 296510 ALU COUNTERSUNK SHIM (10) 901305 HEX SCREW SB M3x5 (10)
303126 ALU SHIM 3x6x5.0MM (10) 902306 HEX SCREW SH M3x6 (10)
07 305912~306000 NARROW PINION GEAR ALU HARD COATED (OPTION) 902308 HEX SCREW SH M3x8 (10)
306190 GRAPHITE BATTERY ADJ. WIDTH PLATE (2) 902320 HEX SCREW SH M3x20 (10)
306192 COMPOSITE ADJUSTABLE BATTERY HOLDER & BACKSTOP (2+2) 903306 HEX SCREW SFH M3x6 (10)
306201 ALU SERVO MOUNT - LONG 903308 HEX SCREW SFH M3x8 (10)
306204 ALU SERVO MOUNT - BLACK 903310 HEX SCREW SFH M3x10 (10)
306234 GRAPHITE FLOATING SERVO HOLDER NARROW 3.0MM 960140 NUT M4 WITH FLANGE (10)
306301 ANTENNA MOUNT - THIN
309402 BODY CLIP FOR 6MM BODY POST (4) 306310 ANTENNA (2)
326176 COMPOSITE LIPO BATTERY BACKSTOP (2+2)

3x6mm
303126 3x6mm SFH
SHIM 3x6x5 SFH

902306
SH M3x6

903306 5mm
SFH M3x6

3x10mm
SFH 3x6mm
903310 SH
SFH M3x10

36
 7. FINAL ASSEMBLY

The information about optional forward

servo mount is at the end of manual.
903306
SFH M3x6

From Servo

▶ VIDEO TECH TIP

For improved weight balance and for more space for electronics, we recommend using a narrow, light servo.

When adjusting steering on the radio, we recommend Attach servo arm to servo output shaft
using full steering adjustment in order to get the best using screw from servo. Servo saver must
IMPORTANT! steering from the car. It is important to verify that the be perpendicular to chassis when servo
steering block does not touch the C-hub; that would 90°
is in neutral.
STEERING SYSTEM lead to chassis tweak due to extra servo strain. DETAIL
SET-UP

#306410
ALU FAN MOUNT
902308
SH M3x8

(#901302) 3x2.5mm set screw

(NOT INCLUDED)

#293110 HUDY BRUSHLESS RC FAN 30MM

#293111 HUDY BRUSHLESS RC FAN 40MM
Motor & Pinion
(NOT INCLUDED)

1mm

Adjust the motor so the pinion meshes with the 1mm

spur gear properly. Make sure the gear mesh is
not too tight.

There should be a small amount of play between

the teeth of the pinion gear and the spur gear.
Some motors do not have a chamfer on
DETAIL
the motor housing. If your motor does
not have a chamfer on the housing and
you want to use a small pinion, the motor
may touch the top deck. Use a moto-
tool with grinding bit or file to remove
material from the top deck; this will allow
the motor to be moved closer to the spur
gear or you can shim out the motor by
using #303122 (3x6x1mm) shims.

37
 7. FINAL ASSEMBLY

NOTE: If the antenna tube does not hold the antenna properly, apply a small
Feed the receiver wire drop of the CA glue to the outside end of the antenna tube while inserting it into
903308 into the antenna tube the holder. Make sure not to apply glue to the inside of the antenna tube, or the
SFH M3x8 CA
antenna wire may get permanently stuck.

Receiver
(NOT INCLUDED)

Speed Controller
(NOT INCLUDED)

Double-sided Tape
HUDY #107875
(NOT INCLUDED)

#306551
XRAY PURE TUNGSTEN
CHASSIS WEIGHT 11g
303126
SHIM 3x6x5

5mm

903310
SFH M3x10

901305
SB M3x5
To ensure correct functioning of the battery
holder, do not overtighten the screw; the holder
must be able to move

HEIGHT ADJUSTMENT
1 turn = 0.5mm

902320
SH M3x20

NOTE ORIENTATION

38
 7. FINAL ASSEMBLY

#107870 #306195
HUDY FIBRE-REINFORCED TAPE ALU FULLY ADJ. BATTERY HOLDER
903310 + WEIGHT FOR SHORT BATTERIES
SFH M3x10

LiPo Battery Pack

(NOT INCLUDED)

▶ VIDEO TECH TIP

#306199
GRAPHITE HOLDER FOR ADJ. BATTERY
HOLDER FOR NARROW BATTERIES (2)

WEIGHT BALANCE

#309862
XRAY STAINLESS STEEL WEIGHT FOR
NARROW BATTERY PACK 35G

#293082
HUDY PURE TUNGSTEN WEIGHT 10g

#293081
HUDY PURE TUNGSTEN WEIGHT 5g

Make sure to have a small Make sure to have a small

amount of play amount of play

▶ VIDEO TECH TIP

Make sure to have a small Make sure to have a small

amount of play amount of play
BATTERY MOUNTING BATTERY BACKSTOP
SYSTEM The new adjustable battery backstop system secures the battery in the car in a tweak-free, non-fixed manner to
help improve traction and makes it more stable and easier to drive.

It is very important that battery has a very small amount of play in all directions so it does not tweak the car,
but the play cannot be too much otherwise the battery may fall out in crashes.

Make sure to have a small Make sure to have a small

amount of play amount of play

Make sure to have a small Make sure to have a small

amount of play amount of play

39
 7. FINAL ASSEMBLY

960140
N M4

▶ VIDEO TECH TIP

HOW TO TWEAK
YOUR T4 Make sure the wheel nuts are very
tight, so the wheels do not loosen
during operation.

BODY UPSTOPS
ALU REAR WING SHIM
#353561 SILVER XRAY OPTION
#293561 SILVER HUDY OPTION
#293561-O ORANGE HUDY OPTION

EXTRA INFORMATION ABOUT OPTIONAL PARTS FOR T4'21

#300902 ACTIVE REAR SUSPENSION™ SET
ALU C-HUB ACTIVE REAR SUSP.
302350 #302350 0º - INCLUDED
#302351 2º RIGHT OPTION
▶ VIDEO TECH TIP #302352 2º LEFT OPTION
#302353 4º RIGHT OPTION
#302354 4º LEFT OPTION

ARS 303122-K
302296

302291

901304 302253
302291
302350

902310
302296
302663 362650

362648 302663
303212

40
 OPTION

902205
SH M2x5
2x L=R

940510
BB 5x10x4 OIL

BEARING OIL ALU WHEEL HUBS - OFFSET

(HUDY #106230) Use Alu 50mm Drive
980210
INCLUDED #305350-K (0 mm)
Shafts in rear
P 2x10
OIL #305351 (-0.75 mm)
BEARING OIL #305352 (+0.75 mm)
(HUDY #106230) #305353 (+1.5 mm)

#302202
ALU STEERING BLOCKS
STEERING BLOCKS WITH GRAPHITE
EXTENSION PLATES - SET
DRIVE SHAFTS #302252 MEDIUM
#305323 50MM - STEEL INCLUDED #302253 HARD
#305333 50MM - ECS #302254 GRAPHITE

ALU C-HUB ACTIVE REAR SUSP.

#302350 0º - INCLUDED
#302351 2º RIGHT OPTION
SHORT #302352 2º LEFT OPTION
902310 #302353 4º RIGHT OPTION
SH M3x10
LONG #302354 4º LEFT OPTION

L=R 2x
303122
SHIM 3x6x1

4mm THREAD
1mm INITIAL SETTING
901304
SB M3x4

10mm THREAD Install the pivot balls with Professional

Multi Tool (HUDY #183011)

1mm

#307322 TITANIUM REAR ARM PIVOT PIN (2) 25mm

1:1 2x L=R

41
 OPTION
ARS™ MOUNTING ALTERNATIVES
There are two alternatives how to mount ARS linkage. Depending if you want to have increased or decreased toe-in when the car is pressed
303122
SHIM 3x6x1 ALTERNATIVE DECREASING TOE-IN ALTERNATIVE INCREASING TOE-IN

1mm
1mm

1mm

▶ VIDEO TECH TIP

ARS

The link is mounted from the bottom of the steering block to the RF suspension holder. With The link is mounted from the top of the steering block to the bulkhead. With this setting,
this setting, the toe-in decreases when the car is pressed. This means that if you set the toe-in the toe-in increases when the car is pressed. This means that if you set the toe-in to 3°,
to 3°, then when the car enters the corner, the toe-in decreases which increases cornering then when the car enters the corner, the toe-in increases which increases rear traction and
speed but decreases rear traction. Recommended for medium-high traction conditions. stability but generates more push. Recommended for low-medium traction conditions.

By adding more shims under steering block, the toe-in is more decreasing under pressing By adding more shims on the top of the steering block, the toe-in is more increasing under
the car. pressing the car.

When using the ARS mounting

alternative, mount the ball joints
to the bulkheads before mounting
the bulkheads to the chassis.

The optional ARS aluminum C-hubs were redesigned to work with the new T4'21 rear suspension geometry and are available in 0º | 2º |4º caster.

ALU C-HUB ACTIVE REAR SUSPENSION™

0º
C-hub is recommended for high-traction conditions as it generates greater off-power steering, rotation, and cornering speed.

2º C-hub angled toward the front of the car helps to generate more traction but also generates more off-power steering and
cornering speed compared to standard rear suspension. Recommended for medium-traction conditions.

4º C-hub angled toward the front of the car generates maximum traction. Recommended for very-low-traction conditions. As
the wheelbase will be shortened a lot with this setting, it is recommended to lengthen the rear wheelbase by moving the
rear arms fully back.

The effect of the toe-in change can be checked on a set-up station. Set the desired toe-in, than press the car to the ground and check how much the toe-in changes and in which direction.

42
 OPTION

303126
SHIM 3x6x5
FLOATING FORWARD MOUNT SERVO HOLDER
Optional floating forward mount servo holder set allows mounting of the servo holder to the
chassis more forward which leads to increased steering and steering response.

Recommended for conditions where better steering response is needed. Makes the car more
reactive but less stable.

902306
SH M3x6

3x6mm

306235
903306
SFH M3x6 3x6mm

3x6mm 3x6mm

903310
SFH M3x10

306205

5mm

3x10mm

903306
SFH M3x6

From Servo

43
 OPTION

ULP LOWER SHOCK TOWER FOR LOWER SHOCK MOUNTING – FRONT #301961
ULP GRAPHITE SHOCK TOWER FRONT
306219 The new feature of the arms is to mount the shocks lower. To use this option you need to use optional low ULP shock 3.0MM - LOWER
SHIM 3x6x1 towers which allows you to mount shocks 4mm lower to lower the CG.

With the lower shock mounting, the car is more stable as it rolls less, is easier to drive in chicanes, and has improved
steering response. Recommended for medium-high technical tracks, especially for carpet.
306219
SHIM 3x6x2

902306
SH M3x6

902310
SH M3x10
3x10mm 301961

2mm
2mm

3x10mm
3x6mm

2mm 1mm
2mm
If you use the lower ULP shock tower,
DETAIL
you need to mount the set-screw for
mounting shock to the LOWER hole.

1mm

ULP LOWER SHOCK TOWER FOR LOWER SHOCK MOUNTING – REAR

The new feature of the arms is to mount the shocks lower. To use this option you need to use optional low ULP shock towers which
306219
SHIM 3x6x1 allows you to mount shocks 4mm lower to lower the CG.

With the lower shock mounting, the car is more stable as it rolls less, is easier to drive in chicanes, and has improved steering
response. Recommended for medium-high technical tracks, especially for carpet.
306219
SHIM 3x6x2

If you use ULP lower graphite shock

902306
SH M3x6 tower, you need to move the body post
one hole higher.

1mm 3x6mm

2mm
3x6mm
3x6mm
1mm
302961
2mm

#302961
ULP GRAPHITE SHOCK TOWER
REAR 3.0MM - LOWER
If you use the lower ULP shock tower,
DETAIL
you need to mount the set-screw for
mounting shock to the LOWER hole.

44
NOTE

45
 199181

107905

108201
104002

108205

108203

199911
109800

107771
107865

181040

107712 107702 183000

181030

107714 181034
181110

107719

107715 293110

107713

107716 107880
293111

104002 HUDY AIR VAC - VACUUM PUMP - ON-ROAD 107720 CHASSIS RIDE HEIGHT GAUGE 30-17MM FOR 1/8 & 1/10 OFF-ROAD 108201 FLAT SET-UP BOARD FOR 1
106260 HUDY TIRE ADDITIVE - TIRE GRIPPER - 50ML - V2 107750 HUDY GRAPHITE QUICK CAMBER GAUGE 1.5°, 2°, 2.5° FOR 1/10 TC 108203 FLAT SET-UP BOARD FOR 1
107090 HUDY BEARING CHECKING TOOL 107771 HUDY BODY GAUGE 1/10 ELECTRIC TOURING CARS 108205 FLAT SET-UP BOARD FOR 1
107601 LIMITED EDITION - REAMER FOR BODY 0-9MM + COVER - SMALL 107855 HUDY PIT LED 109305 UNIVERSAL EXCLUSIVE SET
107643 LIMITED EDITION - ARM REAMER # 3.0MM 107865 HUDY PROFESSIONAL DIGITAL POCKET SCALE 300G/0.01G 109360 ALU NUT FOR 1/10 TOURIN
107702 CHASSIS DROOP GAUGE SUPPORT BLOCKS FOR 1/10 (2) 107870 HUDY FIBRE-REINFORCED TAPE - BLACK 109370 ALU SET-UP WHEEL FOR 1/
107712 CHASSIS DROOP GAUGE -3.0-10MM FOR 1/10 CARS (10MM) 107875 HUDY ULTRA DOUBLE-SIDED TAPE 109800 HUDY ALU TRAY FOR ON-R
107713 CHASSIS RIDE HEIGHT GAUGE STEPPED 2.0-15.0MM 107880 CHASSIS BALANCING TOOL (2) 109840 HUDY ALU TRAY FOR 1/10
107714 ULTRA-FINE CHASSIS DROOP GAUGE 4.0-6.6MM 107904 HUDY QUICK-TWEAK STATION 1/10 & 1/12 ON-ROAD 109860 HUDY ALU TRAY FOR SET-U
107715 CHASSIS RIDE HEIGHT GAUGE 1.0-15.0MM (BEVELED) 107905 HUDY TWEAK BOARD SET 109880 HUDY ALU TRAY FOR ACCE
107716 ULTRA-FINE CHASSIS RIDE HEIGHT GAUGE 3.8-8.0MM 108150 HUDY 1/10 TOURING CAR STAND - V3 111545 LIMITED EDITION - ALLEN
107719 QUICK DOWNSTOP GAUGE TOOL 1.0-6.5MM 108190 HUDY ALU TRAY FOR PARTS 112045 LIMITED EDITION - ALLEN
 107904 199270

106260
107855

199060
109880

298100 107875 107870

108150
183011

107090
107750
109840
107601

107643

177035
109305

109360 175535

109370
111545

132045
109860

108190 112045

188981
113045

188990

1/10 TOURING CARS 113045 LIMITED EDITION - ALLEN WRENCH # 3.0MM 199060 HUDY ALU TOOL STAND
1/10 TOURING CARS - SILVER GREY 132045 LIMITED EDITION - ALLEN WRENCH + BALL REPL. TIP # 2.0MM 199181 HUDY CAR BAG - 1/10 ON-ROAD - TC - PAN CAR - CUSTOM NAME
1/10 TOURING CARS - DARK GREY 175535 LIMITED EDITION - SOCKET DRIVER # 5.5MM 199270 HUDY LIPO SAFETY BAG - CUSTOM NAME
T-UP SYSTEM FOR 1/10 TOURING CARS 177035 LIMITED EDITION - SOCKET DRIVER # 7.0MM 199911 HUDY PIT MAT ROLL 750X1200MM WITH PRINTING
NG SET-UP SYSTEM (4) 181030 HUDY SPRING STEEL TURNBUCKLE WRENCH 3 MM 293110 HUDY BRUSHLESS RC FAN 30MM
/10 RUBBER TIRES (4) 181034 TURNBUCKLE WRENCH 3 & 4MM - HUDY SPRING STEEL™ 293111 HUDY BRUSHLESS RC FAN 40MM
ROAD DIFF & SHOCKS 181040 TURNBUCKLE WRENCH 4MM - HUDY SPRING STEEL™ 298100 HUDY TIN ROUND BOX 80X30MM
OFF-ROAD DIFF ASSEMBLY 181110 HUDY BALL JOINT WRENCH
UP SYSTEM 183000 HUDY PROFESSIONAL BULKHEAD ALIGNMENT TOOL 19MM For more information about tools, set-up equipment
ESSORIES & PIT LED 183011 HUDY PROFESSIONAL MULTI TOOL and accessories suitable for your car please visit:
WRENCH # 1.5MM 188981 HUDY POCKET HOBBY KNIFE
WRENCH # 2.0MM 188990 HUDY PROFESSIONAL BODY SCISSORS 47
 RC AMERICA, 2030 Century Center Blvd #15, Irving, TX 75062, USA
PHONE: 214-744-2400, FAX: 214-744-2401, xray@rcamerica.com

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