Diverter Valves and Blow Off Valves



Replacement Vacuum operated Diverter Valve for VAG 2.0 FSiT

We are proud to announce another industry first for the Volkswagen and Audi tuning market from Forge Motorsport!

Many owners of any VAG vehicle equipped with the all new 2.0T FSI engine, have unfortunately discovered, that the OEM electronically controlled bypass valves, which bolts directly to the compressor cover of the turbocharger, have their limitations. If you are running increased boost pressures, after a software remap (chip), or the OEM valve is being subjected to high temperatures, the lifespan of the unit is significantly reduced.

We have seen diaphragms split.We now have the worlds first fully engineered solution offering both significantly improved reliability as well as valve related boost response. Our valve and installation kit replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control over valve actuation. This product has been thoroughly designed and tested with the expressed intent of offering improved valve response and maintaining ECU control while resulting in absolutely NO fault codes, NO check engine lights, and no adverse effects of any kind. All of the necessary components and detailed instructions are included and everything is designed to make installation as simple as possible.

Atmosheric Blow Off spacer for VAG 2.0 FSi Turbo Engines

Yet another first for the Volkswagen and Audi Tuning Market from Forge ! With the introduction of the VAG 2.0 litre FSi Turbo Engine, and the procurement of our own development/project car, we have developed a Patented Atmospheric Blow-Off adapter specifically designed to fit this application. Simple in execution, yet offering the desirable atmospheric blow-off valve sound, this product has been designed to be fully compatible with the Bosch ME9 engine management systems employed on the following vehicles: Audi A3 2.0T FSI Audi B7 A4 2.0T FSI Volkswagen MK5 Golf GTI/Jetta GLI 2.0T FSI.

Volkswagen Golf/Jetta MK4 1.8T Blow Off Valves

The Splitter is a truly remarkable valve that gives a combination of blow off and recirculation valve operation all at the same time and has been specifically designed for the many turbo engined applications that operate metered airflow management sysyems. This means you get all the noise of the blow off valve whilst retaining the compatibility with the recirculation requirements of the engine management system. As a bonus we also offer the ability to convert the valve to recirculation only mode for those times when stealth running is required.

This valve uses a Copper and Zinc alloy piston which utilises new sealing technology along with a variable spring preload incorporating a ratchet type top adjuster that will allow for the positive and precise adjustment to match the valve to your engine. This is achieved by using a unique single, conical, progressive rate spring that can allow for the retention of boost pressure over a wide adjustment range. This unique spring design also allows for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring. Other manufacturers valves using cylindrical springs with adjustable pre-load often experience restricted piston travel and a reduction in flow volume.

Volkswagen Golf/Jetta MK4 1.8T Diverter Valves

Fitment Guide
All VAG 1.8T engines
All VAG 2.7 Bi-Turbo engines
Porsche 911/996 turbo
Ford Focus RS
Made from billet aluminium, this recirculating diverter valve dumps the charge-air back into the air intake system keeping external noise to a minimum. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably.