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Blitz Blow Off Valve
Blitz Blow Off Valve
Blow Off Valve: The Compressor Bypass Valve (CBV), also known as a blow-off valve, helps to keep the Turbo spinning when the driver lets off the throttle.

Without a CBV, the throttle plate would close, creating a wall to the pressurized air wooshing out of the turbo. The air would crash into the closed plate, then air behind it would pile up, and eventually a wave of pressure would travel back to the turbo. Besides being a shock to the turbo, it would basically cause the turbo to come to a stop.
Then when you wanted to get back on the gas, you'd have to wait for the turbo so spin up all over again. With a CBV, the turbo can free-wheel for a while (like when you're shifting), because the intake pressure is relieved.
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