n8dogg

Just a few question for you all who tune cars that run off 10% Ethanol. Unfortunately all stations in this area are 10%.

My car is a 2004 Z06, long tube, basic bolt ons which I've tuned for normal premium fuel.

-Stoich A/F is about 14.17?

-Does this bring the max power A/F down to 12.0-12.3?

TurboLX

Yes the stoich point moves as you indicated. Just keep in mind that most cheap widebands are displaying "AFR gas" by multiplying whatever actual lambda measurement they get by 14.7, so you'll still see the same numbers displayed as you're used to with E0. The best method here is to just set the stoich point in the tune to the right chemical balance (~14.1 for E10) and do the rest of your datalogging and correction work in units of lambda to avoid confusion associated with that ~4% shift in fuel chemistry.

kp1

This is correct. Set stoich at 14.1 in B3601 & tune using lambda.

But you are correct that for an NA application you would be shooting for a peak power AFR around 12.2 with E10.