Blow-off And Diverter Valves From GFB

GFB offers and extensive range of direct bolt-on kits to take the hassle out of installation. When we say "bolt-on", that's exactly what we mean - no cutting, no drilling, no adaptors needed. Whatever you drive, as long as it has a turbo or a supercharger, we have a valve to suit!

Along with a perfect fit, you’ll also find unique features such as GFB’s patented Venting Bias Adjustment System, and Turbo Management System (TMS) technology.

GFB pioneered the dual-port blow-off valve back in 1999, a design which has since been borrowed by most other BOV manufacturers. The use of atmosphere and recirculation venting ports helped achieve a blow off sound without causing issues such as stalling and backfiring.

Subsequently, in 2001, GFB patented the Venting Bias Adjustment System, which allows the ratio of air vented through either of the two outlets to be infinitely varied. The importance of this feature is twofold; it offers the ability to control how loud (or quiet) the valve is, and it allows the valve to be used successfully on cars with sensitive engine management, which would otherwise suffer driveability issues.

All of GFB’s Blow-off and Diverter Valves feature our Turbo Management System (TMS) technology, which is a method of controlling the flow rate of the air released by the valve to help maintain boost pressure in the intercooler wherever possible when the throttle is closed, offering the following benefits:

• Higher boost upon reopening the throttle for instant response
• Up to 40% more boost throughout the spool-up process
• Up to 30% reduction in lag time
• No compressor surge

In practical terms, fitting a GFB valve with TMS technology can sharpen the throttle response and reduce lag (especially during a gearshift), reducing the time it takes to return to peak boost after lifting off the throttle.

Unbeatable quality, direct bolt-on fit, exclusive venting bias adjustment to control the sound, AND a performance benefit – that’s what we mean by Performance Without Compromise.

Feature Comparison Chart

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TMS Benefit
Spring Pre-Load Adjustment
Improved Boost Holding
Quiet Operation
Maximum Sound
Medium Sound
Adjustable Sound
In-Cabin Electronic Sound Adjustment