GFB Respons T9000 Blow off Valve for Subaru Applications

RESPONS TMS: SMARTER THAN A DUAL PORT BLOW OFF VALVE

On the surface, it may look like just another dual-port blow-off valve, but the Respons is actually much more than that. Featuring GFB’s patented venting bias adjustment system, the Respons allows you to precisely control how much air vents from each of the two outlets.

Why is this so important? There are two key reasons:

Adjust how loud the blow-off sound is. Recirculate all of the air for silent factory operation, vent it all to atmosphere for maximum noise, or set it ANYWHERE in between to suit your preference.
Get a blow-off sound WITHOUT causing stalling, backfiring, or any other BOV-related issues, even on a car with a sensitive airflow meter (MAF).

The Respons isn’t just a noise-maker, it also:

• Offers better throttle response
• Faster boost recovery on gearshift
• Unlimited boost-holding!

For example, using GFB’s TMS (Turbo Management System) principle, tests show that the Respons can return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears.

Twisting the adjusting ring opens up the atmosphere port, whilst the recirculation port is simultaneously closed. This results in possible venting ratios ranging from 100% recirculation, right through to 100% atmosphere and anywhere in between.

Performance AND sound without compromise!

Available In A Huge Range Of Universal And Direct Bolt-On Kits

This bolt-on kit has everything you need included, it fits directly in the factory location (not on a separate adaptor), and no modifications to the car are required.

Product specification:

• Adjust the volume of your blow-off sound
• Up to 30% faster boost recovery on gearshift
• Get the blow off sound without the hassles - even on sensitive MAF-based systems
• Hold unlimited boost pressure
• Direct bolt-on kits available

GFB is no stranger to dual port BOVs. In fact, GFB pioneered the design in 1999, following up with the patented venting bias adjustment system in 2001.

This technology is not just a gimmick – it’s the key to getting a blow-off sound without the issues (unlike other valves), and is exclusive to GFB.

How does a GFB Respons improve performance?

Boost holding

Unlike factory bypass valves, or other brand valves that require different springs for different boost levels, a GFB valve CANNOT be forced open by high boost!

The balanced piston design in a GFB valve uses boost pressure on either side to cancel out the forces. Therefore it doesn’t matter how much boost you run, you can be sure a Respons valve will deliver all of it to the engine.

Throttle response and boost recovery

GFB’s TMS (Turbo Management System) principle is based on an operating method that is different to all factory bypass valves, which can be summarised as:

- A factory bypass valve is open until required to shut.

- A GFB TMS valve is shut until required to open.

This difference in operating methods means that the GFB valve only vents when required, and only enough air to prevent compressor surge.

For example, during a gearshift it is possible to preserve a small amount of boost pressure for a short duration. Then, when the throttle is then re-opened, peak boost is reached faster than if all pressure is lost (as is the case with the factory valve that remains fully open too long).

Application:

SUBARU GT MY01-02
SUBARU GT MY98-00
SUBARU STi MY99-00
SUBARU WRX MY99-00
SUBARU B4 (BE, BH, BT) EJ20TT MY98-03
SUBARU XT MY03-04 (Series I)
SUBARU Impreza 2.0 Turbo GT EJ205 MY98-00