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Engine Performance > Blow Off Valves

Turbosmart
All Turbosmart BOVs are made out of tough and durable billet aluminium and feature tool-free adjustment, solid internal valve seating construction.
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Turbo XS
With new and improved styling, the BOV-H-RFL remains true to it's roots - it's still really f'n loud! Like all our valves, the RFL relieves compressor pressure surge caused by changing gears or backing off the throttle and has been used on turbo charged engines running upto 35 psi boost. If you need to ask how loud it is, this valve is too loud for you! Blow Off Valve Type H-RFL comes standard with both a mild steel and aluminum weld-on adapters. Bolt-on kits are available for most OEM turbocharged applications.
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Perrin Performance
The PERRIN Performance™ blow off valve will accurately hold more boost then any other blow off valve on the market today. Turbo charged vehicles use blow off valves to release excess pressure within the boost tubes.When the throttle plate closes, pressurized air builds up inside the boost tubes. A wave of air pressure surges back to the turbo charger stopping the turbine from spinning. Vane damage, Bearing damage and increased boost lag can all occur.
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HKS
Blow-Off & Bypass Valves have one goal, prevent compressor surge. Compressor surge occurs when the throttle plate of a turbocharged engine closes and the pressurized air is forced back into the turbocharger’s compressor housing causing the turbo to slow down. Compressor surge not only decreases the spool of a turbo but can also damage its center cartridge. HKS Blow-Off and Bypass Valves prevent compressor surge by venting the excess pressure when a throttle plate closes, thus improving spool-up & longevity.
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GReddy
GReddy Blow Off Valves are easily adjustable to prevent both premature boost leakage and compressor surge. Each is made of durable cast and billet aluminum frame and the valve to diaphragm ratio provides performance that cheap piston types cannot offer. The spring stiffness adjustment screw and 3 different sizes give the GReddy user the option to match vehicles with mild upgrades to heavily tuned engines. Also available in an easy to install kit form for many turbocharged vehicles.
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Blitz
The Blow-off valve is essential to all turbocharged vehicles. The purpose of the BLITZ Blow-off Valve DD is to relieve compressor surge without reducing compressor speed. It controls boost pressure that is built up by the turbo and vents it into the atmosphere when the car is not under load (in between shifts).
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