Tuesday, April 18, 2006 - 08:47 am, by: Tim Appleton(Timbo)
Yep, Brett. You should have it tuned on the fuel that you intend running in it if you are running an aftermarket ecu, or piggyback. If you are going to change from standard to ethanol blend fuel in a modified car then you'd need to retune it for the one you're running as the two fuels have different densities, thus resulting in different air-fuel ratios.