How does a dump valve work ?
A blow-off valve is an air pressure bypass valve that is placed between the turbo compressor and the throttle.
When your turbocharged car is on boost, the entire intake system is filled with pressurised air; from the turbo compressor, through the throttle body and inlet manifold and into the combustion chambers. When the throttle is closed, this pressured air can no longer enter the engine. The only path available for the air is to try to flow back the way it c...
