2k, 0 psi at 5 grand mights be a small amount of boost, or a cheap gauge. An n/a car will reach 0 at w.o.t.and at highrpma small amount of vacuume may return.

 

Not any N/A car that I have seen, they all operate in vacuum, they are a glorified air pump after all. The car is sucking air, @ higher RPM is sucking a lot more air, that would create more vacuum, not less.

 

At Wot an NA car is going to be very close to 0vac, it would be so close that it would look like 0 on a guage. My car hits 0 at around 2000 rpms give or take.

Back to my original question though, if the N75 valve fails will it leave the gates open? Im out of state right now so I cant look into it myself until thursday. Thanks