| I was curious to see if I could get more power from more boost from the turbos. Seeing as I get no detonation from just under 24psi on 94 octane I would of thought the turbos capable of making a lot more boost, as they must be quite efficient and not producing that much heat. Trouble we have all found with these turbos though is in the actuators. They are very weak. Even with heavier springs they cant hold much boost. I believe Chipp from GMS installed a HKS actuator with much difficulty and no great improvement. I thought I would ask PE themselves if they have better actuators or have a housing that can accomadate external wastegates. Heres the email that I recieved that I thought may interest some. "Those turbos were not designed to exceed 1.3kgm cm/2 or 19PSi. Runing any more then this boost level completely exceeds the thermal effiency of the turbochargers meaning running increased boost pressure could cause turbo failure and the gains would be minimal per PSi. If you were to run stiffer wastegate springs the actuator mounting brackets could possibly and may already be folding. To obtain greater power it would be best to run larger turbos at the sacrifice of lower-end power but in turn they would generate more efficient air flow at higher boost levels. " Interesting that it sounds like they expect the mounting bracket to be pritty damn weak.
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