As your engine increases in RPM, more exhaust gas is created. That exhaust gas flows over the exhaust turbine, which turns the compressor wheel, which is compressing the air from your intake and pushing it into your engine. This compressed air is what is commonly referred to as 'boost'.
The more exhaust gas going over the exhaust turbine, the faster it spins, and the more air is compressed and flows into the intake.In order to regulate this potentially never ending cycle, our turbos have been fitted with a wastegate and wastegate actuator. The wastegate actuator uses a vacuum powered actuator to slowly open the wastegate, providing bleed off of excess exhaust gas to ensure that overboosting does not occur. I believe factory wastegates are in the 12.5 or so PSI range, that is to say, they should be fully open by 12.5 PSI of 'boost'. The boost controller sits between the wastegate actuator and the actual vacuum source, in this case the intake manifold. When the boost controller senses that the correct amount of boost has been achieved, it quickly opens its valve and the vacuum pressure at the wastegate actuator quickly jumps from 0 to whatever you have determined is optimal. It then quickly opens the wastegate and the excess exhaust gases are vented (in most cases to your exhaust stream)
So, your initial question asks "Will the turbos/wastegates limit themselves?" - yes, but you have circumvented this by installing a boost controller.
The reason I am asking is because I can't run more than 15 psi with my boost controller no matter how much I turn it up. This indicates you have a boost leak, find the cause of it and re-set your boost controller.
"boobies have power" - Bernie(NoVA)
1993 Ultra Red Z32 TT Convertible
2003 R50 2+2 4WD
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