TwinTurbo.NET: Nissan 300ZX forum - My max boost is 15 psi...or not?
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Subject My max boost is 15 psi...or not?
     
Posted by evan_aggie on October 21, 2015 at 10:20 AM
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Message I noticed something quirky that ends up making sense (from what I can tell).

My 530bb were installed (by me) with too low of preload on the wastegates. I set them up to crack at 9 psi and be fully open at 14-15 psi. I thought my boost controller would keep them shut regardless since the solenoid wouldn't "send" that psi to them. Alas, I realized when Greg and Seb came to dyno my car that the pressure was forcing them open irrespective of my boost controller.

Fast forward a long long time, and during my most recent track event at TWS I noticed something rather interesting. On the long front straight going about 125 w/ WOT, I saw my boost actually creep up to 18-20 psi.

My guess is that only then, when I was going that fast and pulling that much air into the engine, despite the wastegates being 100% open, was the turbo STILL generating more pressure than the WGs could release.


     
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