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Message: <blockquote data-quote="mcglsr2" data-source="post: 1228740" data-attributes="member: 15705">Ah, okay.  I would sort of expect a BPV for a supercharger.  The BOV is new to me on superchargers - my experience is more in the turbo realm of things, and even there BOV's strike me more as a fad than a requirement.  All depends on setup of course.  So basically the tune/piggy-back is tricking the computer - meaning the computer measured more air, and it thinks it's getting it, but it's not, so the piggy back pulls back some fuel, even though the computer thinks it's giving the right amount.I'm not sure how a tune fixes this without the computer tables themselves being boost referencing?  Or at least changing to 2 or 3 Bar MAP?Why run a BOV instead of a BPV as the system seems designed for?</blockquote>