What does a blow off valve do?
by 
philipp2000
ANSWERS: 4
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The blow-off valve regulates boost pressure. If boost exceeds a certain threshold, the valve opens and dumps the excess air to atmosphere instead of into the engine, keeping you from either producing more power than you want and/or blowing your engine. BO valves comes in really handy when the throttle snaps shut like during an upshift and the turbo (which is spinning rapidly) still tries to cram air into the engine. Without a blowoff valve, the air will hit the closed throttle, come back, and try to slow the turbo. At best, this reduces turbo efficiency and engine power. At worst, you'll snap/shatter turbine parts which may cause secondary fragmentation damage.
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**The blow-off valve regulates boost pressure. If boost exceeds a certain threshold, the valve opens and dumps the excess air to atmosphere instead of into the engine, keeping you from either producing more power than you want and/or blowing your engine.** ---- Sorry, no it does'nt, that is the job of the wastegate. The wastegate prevents the turbo from overboosting and is controlled via an arm connected to the actuator. This actuator is connected to the intake and once max. boost is reached pushed the arm and opens the Wastegate "dumping" and exhaust pressure that is'nt needed either into the exhaust or atmoshphere. The blow off valve however "dumps" pressure from the intake manifold once the butterfly/throttle closes as a vacuum is created in the intake. The b.o.v is connected to this via a tube etc. once that vacuum occurs the b.o.v pulls open relieving pressure from returning into the turbo (back pressure) so it can spool up quickly and like in the previous answer stop it blowing up in some cases.
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go to the adult section and I'll tell chew....;+
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it goes TSSSSSS when you change gear......this is all it is good for.,... :)
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