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Mate, the stock car makes what? 260HP AT THE ENGINE!!! U r saying with just a retune, and a streetport that u r taking it to about 400HP at the engine on 8PSI instead of 10???
My 13B from an FC in my RX3 totally rebuilt with a high flowed turbo and microtech computer with a 3" straight thru exhaust and no CAT with a huge FMIC made 270RWHP on 13PSI and 330RWHP on 22PSI running on racing fuel.
Are ur power figures on dynojet, coz if they are that could explain it, dynojet seems to give about 20% more power than a dyno dynamics.
But there is no way u r making 500RWHP with stock turbos on 18PSI, 18PSI is over the stock turbos efficiency anyway and u r blowing urselfr if u think u can get that. Big money, big turbos such as T-78's and GT3540's are only just getting 500HP. If u could really do that with stock turbos why the hell would u be getting aftermarket turbos?
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