GFB Deceptor Pro II (part T9525) - Manual (Page 2)

Installing the blow-off valve
PLEASE NOTE!
Since the T9525 Deceptor Pro II is commonly used to replace plastic Bosch style valves, it is
important to note that in most cases the GFB valve MUST be installed in the opposite
orientation to a Bosch diverter valve.
Bosch valves are typically factory installed
so that boost pressure enters the side of the
valve, and dumps through the base. The
Deceptor Pro II should be oriented so that
boost enters the base, and dumps through
the sides. THE DECEPTOR PRO II
WILL NOT OPERATE CORRECTLY
IF INSTALLED IN THE INCORRECT
ORIENTATION.
For typical Bosch diverter valve replacements (image shows a VW Golf GTI):
1.
Remove any factory-fitted engine covers, and locate
the factory diverter valve. Take note of the orientation
and trace the hoses that connect to it. The bottom of
the Bosch valve is typically connected to a hose or
fitting that vents air into the turbo’s intake, whilst the
side of the valve is connected to the intercooler piping
where it receives boost pressure (see picture). If this is
the case, the Deceptor Pro II must be installed in the
reverse orientation.
2.
Some cars have crimp-type hose fittings on the diverter
valve (can be seen on the vacuum hose in the picture
above), which cannot be re-used once removed. If your
car has these clamps, make sure you have suitable
replacements on hand for the installation.
3.
Remove the 2 large and one small hose clamps from the factory diverter valve, then pull the valve free
from the hoses.
4.
Check the location of the small vacuum hose that attaches to the top of the diverter valve. Take note of
the orientation of the vacuum nipple on the Deceptor Pro II to determine if it points in the right
direction. If not, the cap can be removed and re-fitted in any one of 4 positions for a better fit.
5.
Fit the Deceptor Pro II into the factory hoses in the correct orientation, and tighten the hose clamps.
Adaptors Available
Base (inlet) adaptors:
5320 – 20mm hose inlet
5330 – 30mm hose inlet
5333 – 33mm hose inlet
5335 – 35mm hose/1” pipe mount base
5338 – 38mm (1.5”) pipe mount base
Recirc (outlet) adaptors:
5220 – 20mm
5230 – 30mm
5233 – 33mm