[Phantom]

I have no issue editing the ECU as I have done that currently using HPtuners and a secondary program TinyTuner that has additional tables mapped that HPtuners does not have. The issue is the lean burn portion has not been mapped if I can locate it I can easily add it to the program to edit it when I want.

The issue with piggy-backing it is that if I would do this the ECU would try to learn out the "trick". So the Fuel Trims would be pegged at +15-20 due to the skewing of the injectors and the ECU trying to get back to 14.7:1 AFR. This could be corrected by also scaling the O2 sensor at the same time so it thinks that its is at 14.7 or replacing the O2 with an O2 simulator so it thinks it is always at 14.7. If I would go the sim route then I will need to get a wideband O2 and change the fuel maps when the weather changes a lot and when gas changes to the winter blend.

I currently can/could set the ECU to do lean cruse by sending it into Speed Density mode (The MAF is not used) and editing the VE table. The biggest problem with this is that the fueling will be based on the RPM and Load only. That could work but I will get burst knock when there are throttle transitions or if I need to accelerate quickly from a cruse cell.

I would like to be able to run it based on TPS% delta, MPH, RPM, Load, and time with an EGR factor. Also to edit the timing when in Lean mode currently I run 45-50 degrees advance when cruising.