Quote:
Originally Posted by 85rx-7gsl-se
The thing is with a FCD, once you reach the factory boost cut limit( I believe its 8 psi), the FCD just keeps telling the ECU that you only have 8psi of boost regardless of actual boost which mean its not compensating with more fuel and retarded timing.
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Once the boost gets into +, the boost sensor has nothing to do with fuel delivery; it is all ignition timing retard.
Thus, FCD does not affect fuel delivery at all.
Max ignition timing is around 17 or 18 degrees total advance, so even with premium octane, running up to 15psi is no problem.
-Ted