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fatgtr wrote:engine vacuum as at its highest at idle.
fatgtr wrote:engine vacuum as at its highest at idle. due to the fact thats the pistons moving up and down create a vacuum. and because the throttle butterfly is sealed, there is no atmospheric pressure entering. under wide open throttle there is 0 or very littlevacuum in the intake.
turbos force more air into the engine making lets say positive pressure. hence why when the throttle shuts all that pressure in the intake piping needs to be vented somewhere, ie through a bov.
sorta hard to explain. but some of you may get what im trying to say
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