TwinTurbo.NET: Nissan 300ZX forum - No boost past 12 psi
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Subject No boost past 12 psi
     
Posted by RoidRage76 on June 01, 2012 at 9:31 AM
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Message Hello,

Boost won't go above 12 psi, even when my Profec B Spec II is at 100% duty cycle. My profile is current and I've checked the following:

- Boost leak test - no leaks
- No exhaust leaks upstream of the turbos
- Wastegate actuators synchronized and both are cracking at about 8.5 psi. No more adjustment room in the adjustment nuts

Any suggestions as to what to try next?

I see that one possibility is the wastegates need to crack at a higher pressure (11-12 psi), but am I correct that stock wastegate cracking pressure is about 7psi? If that's true then I should be able to go higher than 12 PSI without replacing the wastegate actuators, no?

     
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