What's a Blow off Valve?

A blow-off valve, dump valve or compressor bypass valve is a pressure release system present in most turbocharged engines. Its main purpose is to take the load off the turbocharger when the throttle is suddenly closed.

What is the benefit of a blow off valve?

Benefits of a Blow Off Valve

A blow off valve safely releases the excess air pressure. Compliment the function of the turbocharger. Installing a BOV is typically the next step after you install a turbocharger. It helps the entire turbo system function more efficiently and makes the drive much smoother.

Is a blow off valve bad for your car?

A vent to atmosphere BOV can also cause slight over-fueling between gear changes. This is because a portion of metered air is released from the intake system. It is worth noting that over-fueling is not harmful to the engine. It just means the unburnt fuel will exit the engine as exhaust.