23psi with stock turbo WHERE? yes, at 3000rpm it is possible, if you wont crash hpfp, and it is possible without crashing with additional fueling. not possible at 6000+ rpm for sure, so who needs 23psi at 3000rpm?
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Originally Posted by Solid67
Stock turbo should be good for over 500awhp so I dont think you are at the limit unless you have dynoed your car. Go check out Pure Turbos IG story from today and you will see they posted the dyno from Tom Wrigley's M240i which has BM3, catless dp, drop in filter, wagner heat exchange. They used a combination of E40/Meth to hit 505awhp and 700nm (not sure how much torque that is). Seen guys running as high as 23psi on the stock turbo (I believe one forum member even took it up to 25psi).
If we factor in the B58TU turbo, those can come close to putting down 525-550hp and same for tq (maybe even higher tq). I know the turbo is different, but not really sure what the difference is in terms of the compressor and turbine.
I'm coming close to pulling the trigger on the BMS meth kit or the Fuel-It! CPI kit so I can max out the stock turbo.
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