Ive been searching around but I cant seem to find any definitive information on this subject. Can HPTuners add/enable flex fuel support to a previously non-flex fuel vehicle? I am looking for a solution that would involve installing an ethanol content sensor into the fuel system and wiring it to the stock PCM, upgrading injectors and fuel pump, and enabling flex fuel in the stock OS or possibly writing another OS to my PCM that will support flex fuel. This is purely for a performance application of e85, I am not worried about the small loss in fuel economy.
My particular vehicle is an 03 sierra, but I would also like to be able to do this for other cars in the future.
Thanks