n. - The noise emmitted from a blow-off valve in a vehicle equipped with a turbo forced induction system when excessive back pressure is released. Excessive back pressure is created when the throttle is closed during gear changes or deceleration, causing turbo cavitation.
There is an orange SRT-4 here with black rims on it that has this blow-off valve thing all the time... like he just lets go of the gas when he is going 20 km/h and PSSSSSSHHHHHHH ...I mean I have an air compressor and if I turned it on and then undid the drain plug it wouldn't make so much PSSSSSSHHHHHHHing
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