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Originally Posted by RICE RACING
We dynoed a Toyota supra with auto gearbox and it made following
470rwkw on 11.0:1 AFR 12 deg timing 34psi boost
470rwkw on 12.5:1 AFR 12 deg timing 34psi boost
471rwkw on 12.5:1 AFR 18 deg timing 34psi boost
We have dynoed FSAE engines and made no difference in power or torque from 10.8:1 AFR to 13.9:1 and all ratios between....
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My auto supra registered 5-7% more power just by trimming off fuel from the stock 10.5-11:1 up to 12.5:1
That was at holding 18psi on stock turbos.