GFB T9355 User Manual

GFB

P.O. Box 1017

Riverwood, NSW 2210, Australia

Ph: [phone] Fax: [phone]

Website: www.gfb.com.au Email: [e-mail]

GFB DV+

Installation Instructions

Part #T9355

INSTALLation

?Remove the engine cover by pulling up on

each side in the locations indicated ( ),
then slide the cover towards the front of the
car ( ) to release the rear clip.

There is a small vacuum hose ( )
connected to the top right of the engine cover,
this can either be disconnected so the cover
can be removed, or leave the hose connected
and simply lay the cover upside-down on the
back of the engine bay.

?The turbo intake pipe needs to be removed

to gain access to the lower bolt on the diverter
valve. Using a Torx driver, remove the screws
shown by the yellow arrows.

Pipe clamp

?Lift the pipe clamp up to remove it. Pull the

turbo end of the intake pipe free, then pull the
clamp end out and set the pipe aside. Note
that the pipe is sealed with o-rings and these
can initially make the pipe difficult to remove ­wiggling the pipe up and down as you pull on it
can help break the o-ring grip.

?It helps to remove the rubber boot

surrounding the dipstick for easier access to
the lower diverter screw. To do this, remove
the dipstick and lift the boot out. Replace the
dipstick to prevent dirt getting into the
dipstick tube.

?Using a 5mm hex key (a ball-end hex key

makes this task easier), remove the two
screws holding the factory diverter valve on.

?Un-clip the electrical connector then

remove the factory diverter.

1. Remove the yellow o-ring from the factory
diverter.

3. Remove the second yellow o-ring and keep it handy, as
these will be used in the DV+ assembly.

Remove all other parts including the spring - all you need for
the DV+ installation is the bare solenoid body and the two
yellow o-rings.

2. Using a flat screwdriver in the o-ring groove,
carefully pry the piston surround from the
solenoid body.

4. Assemble the GFB parts onto the factory solenoid body as shown in the exploded view below, making
sure to use the GFB-supplied plunger spring, and the two yellow factory o-rings.

Main piston spring:

Please see notes on

the next page

Note that the bolt holes are NOT
SYMMETRICAL. When you assemble the DV+
body onto the solenoid body, check the
alignment of the holes - if they do not line up
properly, rotate the DV+ body 180 degrees
and check that they line up correctly before
installing on the car.

X

GFB-supplied

plunger spring

Installation - continued

?Install the DV+ assembly onto the turbo,

making sure to hold the piston so it doesn’t fall out
during this process. Don’t forget to use the
supplied longer screws.

?Clip the electrical connector back on, then re-

install the turbo intake pipe.

?Re-fit the rubber dipstick boot.
?Re-install the engine cover, making sure the

vacuum hose on the top right corner is connected.

Using the main spring

The DV+ can be configured in two different ways, depending on your desired outcome. Fitting the DV+
with the main spring installed as shown on the previous page can be thought of as a “Sport” mode,
offering the best possible throttle response and boost recovery during on/off throttle applications (i.e.
during gearshift with a manual transmission).

Using the main spring means the DV+ can open and close progressively in response to how much boost
pressure is present, unlike the factory diverter which just opens fully regardless of whether there is boost
to vent or not. Because this operation method is different from the factory diverter, it is not unusual to
hear a different sound from the intake when lifting off the throttle at low RPM, especially if you have an
aftermarket intake or a larger turbo installed.

Additionally, in some cases this different operating method may be mis-interpreted by the ECU as a faulty
diverter valve (is simply sees the diverter doing something different, it doesn’t know the diverter is
actually attempting to improve throttle response), resulting in fault code P2261 being recorded. This
does not indicate that the DV+ is faulty, nor does it cause any issues to the turbo or engine.

If the idea of a possible fault code of different sound bothers you, and you simply want a direct
replacement for the factory diverter that is stronger, holds boost better, and lasts longer, you can choose
to install the DV+ WITHOUT the main spring behind the piston. This configuration can be thought of as an
improved “Standard” mode, which behaves just like the factory diverter, but with the added benefits of
better boost-holding, strength, and reliability.

This product is intended for racing use only, and it is the owner's responsibility to be aware of the legalities of
fitting this product in his or her state/territory regarding noise, emissions and vehicle modifications.

GFB products are engineered for best performance, however incorrect use or modification of factory systems
may cause damage to or reduce the longevity of the engine/drive-train components.

GFB recommends that only qualified motor engineers fit this product. Warranty is for the period of one year
from the date of purchase and is 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.