I've been combing the forum trying to learn as much as I can about flex fuel support in the E38. I have a car that is not flex fuel currently but it looks like I can flip the switches and turn it on. My intention would be adding the sensor so I could be safe with varying mixtures of ethanol, not using a COS with the switch or running a fake PWM signal instead of the sensor.
What I haven't found is anyone flipping on the flex fuel options on a big horsepower engine with forced induction. The problem I am trying to overcome is the availability of E85. There's lots of it around home but when I take a roadtrip with the car E85 coverage is spotty. It would be very slick to be able to tune for varying mixtures!
Has anyone had success doing this?