dsrturbonz wrote:
I have factory inlet runners with the plasmaman plenum attached to it. It makes274 rw kw dyno pack at 8psi. But after that if we increase the boost up to 15-20+ it wont make more power. It makes a horrific sound echoing from what sounds like the turbo. We done exhaust checks,intercooler test, inlet cams at 120deg and ex 115 everything bang-on and we cant figure out why it wont make more power. The head should be able to flow a easy 700hp. So now we're considering changing the plenum to a greddy one and before we did i wanted to try and find a car running over this much HP using factory runners275kw is about 370BHP give or take i think
What are the specs on the turbo (both sides). Sounds like compressor surge (the REAL compressor surge) from a poorly matched hot vs cold side. Can you post a vid?
BTW, factory intake runners and cams will easily flow enough for over 300rwkw (400rwhp).