Tuning for E85 using the stock O2 sensor?
Posted: Sun Jan 09, 2022 8:03 pm
Hello,
When I was tuning my supercharged 2007 S2000 on 93 octane over the last few years, it became evident that the stock O2 sensor pegs rich at 10.14 LAM or 11.52 LAM.ADJ; no matter how rich the car runs, that is the indication. That worked fine for gasoline, as I was generally targeting 11.8 LAM.ADJ on 93. However, I recently bought the parts necessary to run flex-fuel on the car (FFC-100 and a GM sensor, plus a big box of fuel system parts), and e85 will require a much richer target AFR than the stock O2 sensor can measure.
What would be the best approach to tuning this setup? Is there a way to replace the stock sensor with something that has more range? I know I can always buy a stand-alone wideband, but that data won't be integrated into the log files. Do I just tune it on gasoline and extrapolate fueling and timing through the range of ~E10-E85?
Thank you.
When I was tuning my supercharged 2007 S2000 on 93 octane over the last few years, it became evident that the stock O2 sensor pegs rich at 10.14 LAM or 11.52 LAM.ADJ; no matter how rich the car runs, that is the indication. That worked fine for gasoline, as I was generally targeting 11.8 LAM.ADJ on 93. However, I recently bought the parts necessary to run flex-fuel on the car (FFC-100 and a GM sensor, plus a big box of fuel system parts), and e85 will require a much richer target AFR than the stock O2 sensor can measure.
What would be the best approach to tuning this setup? Is there a way to replace the stock sensor with something that has more range? I know I can always buy a stand-alone wideband, but that data won't be integrated into the log files. Do I just tune it on gasoline and extrapolate fueling and timing through the range of ~E10-E85?
Thank you.