In fact I kept the original ECU in place to control some stuff like :electronique throttle body,sterring switch,A/C switch,speedo-meter,etc...
I only use VEMS to control the Fuel and ignition.
Working that way I achieved to get the engine running like an OEM ( cold start,sterring rpm,A/C control rpm),and keep the OBD fonctionnal.
For me it's necessary because I use my car every days
And the most important for me is to keep the original ecu working in case of vems crash( by wrong manipulation
).
I'm still a newbie
.
Talking about the harness why don't they use a different connector with a bigger ground pin section(mm²) able to drive more current and work with only one wire ground input.
And that's what I've done on my board.
I run my car with Vems for more than one year now without flyback diode and it seems to be good.But I have some electric noise(bad craks) in my audio system that and I can't fix.
and also some issue with my laptop connection.
Tha's why I would like to put this diode hoping for some improvement....