GFB DV+ T9354 diverter valve for Ford, Volvo and Porsche with Borg Warner turbocharger

DV+ T9354: no noise or unnecessary extras – just performance

A simple and essential upgrade for up to 30% faster boost pressure build-up

Retains factory ECU control and returns vented air to the intake system

GFB DV+ T9354 is a performance-focused product that delivers:

• sharper throttle response,
• faster boost pressure recovery when changing gear,
• elimination of boost pressure leaks,
• long service life.

Proven TMS technology for reliable boost pressure retention and optimal throttle response

T9354 is a fully recirculating direct replacement valve for the factory pneumatic diaphragm BPV (bypass valve) used with Ford, Volvo, Porsche and Borg Warner turbochargers. It is designed for users who want improved performance without additional noise.

Using GFB TMS technology, T9354 can help the engine reach peak boost pressure up to 30% faster than the factory diverter valve when changing gear.

The factory BPV has several important design and operating weaknesses.

Tuned engines running high boost pressure generate a great deal of heat in the charge air. As the BPV is mounted directly on the compressor, it is exposed to the hottest part of the intake air and to heat from the compressor housing. This can cause the factory diaphragm to rupture. If the damage goes unnoticed for some time, the turbocharger may be damaged because the ECU increases turbocharger speed in response to the loss of boost pressure.

The operation of the factory BPV is not optimised for throttle response. Due to its soft spring and the solenoid valve built into the vacuum hose, it can operate in only two positions – fully open or fully closed.

The factory BPV cannot open and close progressively according to the current boost pressure. Throttle response is therefore poorer when the valve vents more air than necessary, for example during partial throttle lift-off. T9354 solves these issues with durable metal and silicone valve components, so the DV+ is designed for long-term use even in demanding conditions.

For improved performance, the DV+ has carefully selected spring stiffness and adjustable spring preload, enabling progressive operation and sharper throttle response. This is the basis of GFB’s TMS principle, which has been shown to reduce the time to peak boost pressure by 30% when changing gear. The benefit is particularly noticeable when modulating the throttle to balance the vehicle in a corner.

Suitable for: Ford Focus II (DA), Land Rover Freelander II (L359), Land Rover Range Rover Evoque I (L538), Porsche 911 997, Volvo C30 I (533), Volvo S40 II (544), Volvo S60 II (134), Volvo V40 II (525), Volvo V50 I (545), Volvo V60 I (155), Volvo XC60 I (156).