Maybe someone can chime in who is a tuner, but what are the limits of knock/detonation resistance for E85 at 12.5:1 compression? Should the OP consider going with a much lower compression to make reliable power on E85?
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Pheonix_gts86 What made you stay with 12.5:1 compression? Just for reference, the new Porsche Turbo makes 640hp with a compression of 8.7:1, and it seemed to be necessary to drop compression from 9.8:1 to do it reliably on pump gas. Maybe there is a lot of wiggle room with E85, but if the effective compression gets too high then maybe that won't be reliable.