One of the tables in the E38 (etc.) has the various AFR's for mixes of gas & ethanol. I have converted my turbo 2010 Camaro to use E85 and rather like the results. However, I question how the Eq Ratio (Alcohol) is being used. I understand that there's interpolation between the Eq Ratio (gas) and Eq Ratio (alcohol), as controlled by one of the other tables.
This is where I'm getting confused. For argument sake, let's say that I'm running 80% alcohol (as measured my the FF sensor) and the AFR for alcohol lambda is 10.8 (I don't have the exact number in front of me). Does the computer correctly take the 10.8 AFR / 1.35 Eq ratio and target 8 AFR (which would be very rich)? My wideband numbers don't seem to correlate this. OR... is it using the left-most cell in the AFR table (14.6xxx) and applying the eq ratio against that one?