as far as i know, you'd need a piggy back or a stand alone to do this....to mess with your AFR you need to add or remove fuel, and the only way I know you can do this is to take control of the injectors from the stock ecu and put something else in charge.S.S.S.P5 said:hey guys, just wondering if you could shed a little insight-
i just swapped in a fsze into my usdm fsde protege5, and am curently runing it on the stock ecu, and would like to hear some options for advancing the timing for the up'd compresion + the a/f and what not