Quote:
Originally Posted by Senna-F1
I have a flex fuel tune. I’m pretty sure timing and fuel are set for pump and e85, and then interpolated for whatever mix you end up using. Obviously fuel has to work this way, and I assume timing works the same way. Tune for best and worst fuel case and interpolate the points for the mixtures of each fuel type.
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You could be right, that's above my pay grade.
I actually misspoke. I was thinking boost. Unfortunately, on 91 octane my car started knocking at 13 psi without pulling a bunch of timing.