A Forge Motorsport Recirculation Valve is designed to be an upgrade to the factory valve. Capable of dealing with higher boost pressures, more reliably designed. Forge also offer the option of an atmospheric valve on many cars.
- Uprated for higher boost pressures
- Replace failure-prone factory valves
- Helps to reduce turbo-lag
When you come off the throttle on a turbocharged car the built-up charge of pressurized air has to go somewhere. If it can't, or if the air isn't released quickly enough then the turbo will slow down or even stall leading to a delay getting back on boost when you get back on the throttle.
This is where a dump valve comes in. It releases the built-up pressure. Most cars have a dump valve of some sort fitted from the factory. This will have been tuned for the factory tune and boost levels though. On many cars, a soft flexible diaphragm is part of the valve, and these wear out. Once the valve is leaking it can cause problems with how the engine functions.
Forge Motorsport offer a wide range of uprated Dump Valves. These are designed to handle additional boost. Each valve is designed to do a very thorough job of releasing pressure, getting your turbo back on boost fast.
A recirculating valve is what most cars come fitted with from the factory. It discretely recirculates excess air back into the inlet. While there will be no extra noise, the valve will be compatible with increased boost pressure. This is often desirable for motorsports as it allows you to meet track noise regulations and the excess pressurised air often contains oil particles, which, on its way back through the engine aids lubrication.
On vehicles where the valve is connected to the ECU (increasingly common on many modern engines), Forge are supplying a complete kit with relevant wiring and plugs.
These are generally supplied with full instructions.