We did not do this so you can use boost by gear. We did this for its performance benefits. When you spin the blower faster then bleed off the boost after you hit your desired peak PSI then you move the entire power curve to the left. Meaning we will have way more HP and TQ lower in the rpm band at 14psi then anything on the market. It also allows us to offer a supercharger that can run a "daily" map at 14psi and then a "kill" map at 18psi. Or a daily of 12psi and a built motor with 20+ psi.
Otherwise you are always stuck to the PSI of the pulley you have on.
The BPV just opens when its told to so if you set that at 15 then it opens at 15 and dumps the excess charge air vs a WG dumps the excess exhaust.
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