Wow! This is great news! Wish I new this a month ago. It would have saved me a lot of work. I have it running pretty well now with my setup but the starting is a little slow. I have read this can be a problem with "time based" versus "trigger return". I also need to run the dummy coil. Once I figure out how to build the trigger and mod my board I will probably make the switch. Thanks again!toydoctor72 wrote:I have shared VR inputs between a megasquirt and a toyota ecu, it works fine! Just use a occilliscope to insure the waveform hasn't been modified any or the amplitude of the waveform isn't to low. So far I have done two vehicles this way, furthermore the megasquirt triggers the ignitor well enough for the factory ecu to not set any igf codes.
You should be able to use one of the ignition outputs to trigger igt on the factory ignitor. Insure that the output is NON INVERTED or the LED output is pulled low or grounded when the engine is not running. The factory ignitor is looking for a 5v high (from a 1k pull-up resistor to 5v) to charge the coil then when the signal goes low the ignitor then fires the coil.
As long as the factory ecu sees igf and speed signals from the cam and crank sensors, it will function as though it was in control of the engine.
Ryan
Todd