GFB Deceptor Pro II Blow-off Valve (part T9533) - Manual (Page 3)

Valve Installation
T9533 is suitable for custom hose-mount installations (1.25” I.D. hose inlet and outlet), and is
also a direct factory replacement for:

Mitsubishi Lancer EVO I-X

Mitsubishi Lancer Ralliart

Mitsubishi Lancer GSR (4G93)

Mitsubishi Ralliart Colt
For typical Mitsubishi installations:
1.
Locate the factory diverter valve, and if
necessary, remove any intercooler hoses in order
to gain access to the valve – in most cases this
isn’t necessary. Loosen the two hose clamps,
then pull the valve free from the two large hoses.
2.
Open the small hose clip that retains the vacuum
hose and slide the vacuum hose off the valve (if
it is difficult to remove, try pushing the end of
the hose off carefully with a flat screwdriver
instead of pulling it).
3.
Check the orientation of the factory valve
vacuum nipple, and compare it to the GFB valve.
The Deceptor Pro II cap can be removed and re-
fitted in 4 orientations if required for a better fit.
4.
Push the base of the GFB valve (Stealth FX
pictured) into the hose so that it is in the same
orientation as the factory valve. Then push the
plumb back outlet into the turbo intake pipe.
Tighten both hose clamps.
5.
Re-connect the vacuum hose onto the nipple and
replace the hose clip.
Spring Adjustment
Contrary to popular belief, the spring pre-load DOES NOT need to be adjusted to suit different
boost levels. The valve will stay shut under full throttle conditions regardless of boost pressure or
spring pre-load.
Rather, the spring pre-load affects how easily
the valve opens when you lift the throttle, and
how long it stays open when it vents. Adjusting
the spring is a simple matter of ensuring the
valve opens enough to release the air, but not
long enough to cause idling problems. The guide
below will walk you through the steps involved.
The screw in the centre of the head is the spring
adjuster (shown opposite). Use the supplied
5mm hex key for this screw.
The softest spring setting is achieved when the
top of the adjustment screw is 3mm above the
head of the valve. Do not set the screw more
than 3mm above the head.