GFB VTA
Installation Instructions
Part # T9430
+61 2 9534 0099 sales@gfb.com.au www.gfb.com.au facebook.com/GFBturbo instagram.com/gofastbits
Installation
The VTA replaces the short plastic joiner
connecting the turbo outlet to the charge pipe.
Begin by removing the main charge pipe. First
unplug the connector from the pressure sensor so
the wiring does not get damaged ( ). There are
2 plastic clips ( )on each end of the charge pipe
that must be spread apart whilst wiggling the pipe
free. Remove the charge pipe and set aside.
Now remove the short joiner section from the
turbo, again by spreading the 2 clips apart and
wiggling it free. Carefully remove the o-rings from
the joiner and install them onto the VTA.
Before re-installing the charge pipe and VTA, the
manifold vacuum tap now needs to be installed to
supply manifold pressure/vacuum to the VTA.
Follow the plastic vacuum hose shown ( )
downwards to where it connects to the intake
manifold.
This hose needs to be unclipped, which is done by
sliding the tab in the direction shown ( ).
Unclip and pull it free from the metal barb.
Screw the supplied hose barb into the threaded
hole in the GFB manifold tap, making sure to use
tape or sealant on the thread to prevent leaks.
Push the supplied hose onto the manifold tap hose
barb, then slide the manifold tap onto the metal
barb on the intake manifold. Secure it with the
supplied plastic clip as shown ( ).
Push the plastic vacuum hose onto the end of the
GFB manifold tap until it clicks into place ( ).
Feed the supplied vacuum hose towards the
location where the VTA will sit. It is neatest to run it
towards the firewall, then under the turbo intake
pipe.
Installation - Continued
Now the VTA and charge pipe can be assembled
and fitted back onto the car.
Ensure the o-rings have a light coat of oil, then clip
the VTA on to the charge pipe first (not the turbo
first). It is important to orient the VTA so that the
notch lines up with the corresponding arrow on
the charge pipe ( ), then press them together
until the clips lock into place.
Now clip the charge pipe and VTA assembly into
place, ensuring all clips are securely attached, and
the wiring connector is plugged back onto the
pressure sensor on the charge pipe.
Now connect the vacuum hose from the manifold
tap to the port on the VTA. The hose should be
trimmed to length so there is no excessive slack.
Spring Adjustment
The GFB VTA DOES NOT require spring pre-load adjustment to suit specific boost pressures. The
pressure-balancing design means that whilst the throttle is open, the pressure on both sides of the piston
is equal so it will stay shut under boost REGARDLESS of the spring setting or the boost pressure.
The spring pre-load on the VTA is used to adjust how easily the valve vents, and how long it vents for when
lifting off the throttle.
A softer spring pre-load will allow the valve to vent easily, and the sound will trail on for a longer time. A
firmer pre-load will mean you need to drive the car harder before you start to hear the valve vent, and the
venting duration will be shorter.
Spring pre-load
adjustment screw
The screw in the centre of the VTA’s cap is the spring
pre-load screw. To change the spring pre-load, you
simply swap the screw for a longer or shorter one.
The VTA comes supplied with 4 different length
screws, the shortest of which is installed in the valve
from the factory. The longer the screw, the firmer the
spring pre-load.
Take the car for a test drive to decide if you prefer a
different pre-load screw. It is generally best to choose
a screw that allows you to drive the car sedately
without hearing the valve vent.
WARNING:
GFB recommends that only qualified motor engineers fit this product. GFB products are engineered for best
performance, however incorrect use or modification may cause damage to or reduce the longevity of the
engine/drive-train components.
GFB LIFETIME WARRANTY:
Our commitment to quality means that when we put our name to something, we are also staking our
reputation on it. That’s why we back our products with the best warranty in the business!
You should expect a lifetime of use from a well-engineered product, so if your GFB product fails as a result of
defective materials or faulty workmanship whilst you remain the original owner, we will repair or replace it
(limited only to the repair or replacement of GFB products provided they are used as intended and in
accordance with all appropriate warnings and limitations. No other warranty is expressed or implied).
If a fault occurs as a result of usage outside of the terms of the warranty, or you are not the original owner, fear
not, we can still help you. You should never need to throw a GFB product away, as spare parts are available
and won't cost the earth.
TECH SUPPORT:
We want you to get the best advice, first time. That’s why our engineers are available to answer any technical
questions you may have. Head to www.gfb.com.au/contact-us to get in touch.
