This is where a BOV comes in, it creates that passage for the compressed air charge to escape before it reverts back to the turbo and tries to stall the compressor wheel. When an engine is ‘on boost’ and the throttle is closed quickly, a large volume of compressed air can no longer make its way into the intake plenum, and will then look for the next easiest route to move to. Carl Ruiterman, E&H Motorsīlow-off valves are an essential part of a forced induction system, as they vent off pressure surges between the throttle body and turbo. BOVs contain a valve that allows the pressurized air in your intake piping to vent to either the atmosphere, or back into the pre-turbo intake pipe when the throttle is closed - greatly reducing the risk of damage to the turbocharger, or intake piping, because where else is all that compressed air meant to go? Without a BOV, compressor surge can be a real problem on older, worn-out turbochargers - resulting in premature turbo failure. Before we get the truth behind blow-off valves, it would make sense to get a brief overview of how these noisy suckers work.
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