It releases the built up pressure. Most cars have a valve of some sort these days. This will have been tuned for the factory remap and factory boost levels though. On many cars a soft flexible diaphragm is part of the valve and these wear out. The factory valve will be designed for quietness too.Forge Motorsport offer a wide range of uprated Atmospheric Dump Valves / Blow Off Valves. These are designed to handle additional boost. Because they are atmospheric, they release the charge of air with that distinctive "Whoosh" noise. Each valve is designed to do a very thorough job of releasing pressure, keeping your turbo spinning fast. Releasing to atmosphere rather than recirculating the air should help to keep inlet temperature down (because air coming out of the turbo is warmer than air from outside the engine bay). Forge Motorsport offer properly engineered solutions with most of their products and these are no exception.
Many modern engines have problems when you switch from recirculating to vent to atmosphere. Forge have, in most cases, engineered a complete solution to try and get around this. Forge are also offering complete kits for vehicles with ECU controlled valves (many newer VAG cars have this set-up).This means you can enjoy the sporty blow off valve noise on a wider range of cars than ever. For many of us that noise is all part of the fun a of a turbocharged car! These are generally supplied with full instructions.
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Demon Tweeks, 75 Ash Road South, Wrexham Industrial Estate, Wrexham, LL13 9UG, United Kingdom. The item "Forge Blow Off / Dump Valve / Engine Tuning And Fitting Kit FMDVST180A" is in sale since Sunday, July 8, 2018. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Air Intake & Induction\Dump, Bypass & Blow-Off Valves".The seller is "demontweeksdirect" and is located in Wrexham. This item can be shipped worldwide.