Comp XE275HL Idle Vacuum

AJ/FormS said

Try to imagine, on an autocross track, where on that track you will be at or below that rpm, and repeatedly stabbing the brakes, to drain the booster. My guess is it will never happen, therefore my guess is that a properly functioning booster will not have a problem.

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I'm honestly not trying to be gratuitously argumentative, but this bleed off does happen... The problem is that, for doing weight transfer to pitch a RWD car around in particular, you left foot brake a lot (or heel & toe) while still partly in the throttle if you are really aggressively working the car through a set of tight corners. So the engine dropping low RPM's to recover the vacuum loss does not always occur as one might think. It really does happen that way. Happens in rallying too, snapping the car through a tight set of corners.