Aluminium Dump Valves There is no doubt that Forge are one of the U.K's leading manufacturers of alloy aftermarket accessories. All of their parts are made in-house under strict ISO9001 regulations. Parts are manufactured using CNC machinery and together with Forge's confidence in their product, they also offer a lifetime guarantee and "no hassle" service promise. The idea of dump valves is to create an outlet for excess boost pressure, built up after prolonged acceleration. Once the throttle is released, any excess boost pressure creates a negative feedback within the system by flowing back through the intercooler and into the turbo. Without a dump valve, the pressure would normally act against the spinning turbo. By fitting a dump valve, the pressure is released, therefore reducing turbo lag and improving pickup between gears. Forge offer re-circulating dump valves where the air charge is dumped back into the air system (this reduces external noise and improves throttle response) and atmospheric dump valves where the air charge is released into the atmosphere (this creates the classic 'whooshing' sound when changing gear). Available for many applications including; Audi TT / S3 / A4 / A6 / RS4 / S4 / ALLROAD, Fiat Uno / Punto, Ford Cosworth / Escort RS Turbo / Fiesta RS Turbo, Lancia Delta, Mitsubishi EVO / GTO, Nissan GTi-R / 200SX, Renault 5 GT Turbo, Saab, Smart, Seat Ibiza / Leon / Toledo, Subaru Impreza, VW Beetle / Bora / Golf / Passat. | 
