Connections: 25mm inlet and outlet
Vacuum hose connection: 5mm
Color: Black anodised finish for those who prefer keep things a little more clandestine.
VTA or Risurculation: 100% resurculation only.
- Advanced TMS benefits
- Spring pre-load adjustment for max. response
- CNC billet aluminium and brass construction, Australian made
- Anodised finish for long lasting performance and looks
- Vacuum nipple can be rotated to 4 positions
- Will hold for unlimited boost!
- Built to last
- No need for a "re-build" kit
Best choice for:
- Designed to replace the stock Bosch diverter valve on applications like Audi, Ford, SAAB, VW but with the TMS advantage.
- dv+ Diverter valve
- Fitting instructions with detailed instructions for how you set the spring pre-load.
Whats does TMS mean?
TMS? GFB’s Turbo Management System is the term we apply to our diverter
valves that have features designed specifically for the purpose of
turbo lag reduction. Tests show that TMS features can return the engine
to peak boost up to 30% faster than a factory diverter valve when
shows comparative manifold boost pressure rise during 1st to 2nd gear
shift as tested on a Nissan CA18DET with a T28 turbo. GFB TMS
improvement is seen as a 30% faster return to peak boost, during which
time up to 40% more boost is available)
Frequently asked questions:
What boost level can I use with a GFB blow-off valve?
level you like! The design of all GFB blow-off valves means that you
can run boost levels that will more likely blow up hoses before the
valve will leak. Because of the acetal seat the piston makes a perfect
seal, and our valves have been tested in the factory to pressures of
110psi (if you can blow up one of our valves on a car we'd like to hear
How do I adjust the spring pressure to suit different boost levels?
don't need to! At full throttle there is equal boost pressure on both
sides of the piston, so it doesn't matter what boost level you are
running, the pressure balances itself out. It then requires very little
spring pressure to stay shut. The spring adjustment is used to match the
VACUUM signal of the car. The idea is to adjust the valve so that the
piston remains just closed at idle. This way, when you lift off the
pedal, the spring will be neutralized so that the boost is free to push
the piston open.
Why choose a GFB Blow of Valve:
More Power - Ours holds the boost, can yours?
diverter valves are commonly known to leak or fail, especially with age
or higher boost levels. A GFB TMS will hold as much
boost as you can throw at it, 24/7 - No frequent re-builds or replacement required.
Better Response - Through reduced turbo lag!
GFB TMS is designed specifically to minimize lag - tests show that it
can return the engine to peak boost up to 30% faster than a factory
diverter when shifting gears, whilst delivering up to 40% more
Better Drivability - Smoother than stock!
diverters tend to operate either fully open or fully shut. This can
cause annoying surging at freeway speeds, requiring constant throttle
corrections to hold a steady speed. The GFB TMS completely eliminates
this problem, making the car smoother to drive.