This is actually being looked into. At the very least though, it would take some new code in the ECU and a GM sensor that is used on the flex-fuel vehicles that can be used to monitor the amount of ethanol in the fuel.

Normally, the two maps in the ECU are used for knock. When knock is at or above 6 counts, the octane flag in the ECU begins to decrement from 255. How much this decreases determines how much in between the two timing and fuel maps the ECU operates.


Eric

 

Since there would be a 30-40% more fuel for E85 it would need a totaly seprate map. If you were to dump E85 in on your gas map you probably could not even get the car to start. So no the low oct map would not work. Would need some kida swith. Would be way cool if some one figures it out on a stock ECU ware you can just flip a switch to change maps.

 

I had an Audi A4 with APR software and being able to switch through 4 sets of maps through the cruise control was amazing. Nothing else like it really.