using E-manage. That is a POS. By time you spend all the money on the hardware, sensors, harness, you would have spent more than a zemulator and got an ineffective tuning tool. A piggy back is confined to the parameters built into the main ecu. That is why they suck if you want to change one parameter, other paremeters get a effected indirectly. You are just chasing your tail. You changed A/F ratio and now timing has changed. Why not cut the B.S. and change the actual ecu code?
