Tuning for E10?
Thread Starter
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
Tuning for E10?
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?
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?
Pro
Joined: Feb 2003
Posts: 745
Likes: 136
From: Detroit MI
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.
