How to Megasquirt your 3G Hemi

Modz said

+1 also have to rebuild my engine first. But knowing what I'm getting myself into is excellent :)

I notice you bought both
MS3 wiring harness (8 ft): $67
MS3x wiring harness (8 ft): $72

Was there a reason for this? How much of the original engine loom was used?

Thanks

Click to expand...

I only used the plugs from the factory harness. I took a couple feet of factory wire with the plug when I was able, which proved useful for the injector wiring and coil pack wiring.

I could have wired every pin individually, but I wanted all the wires labeled so when they made it to the engine bay it was easy to know what was what.

Theoretically you could get the factory wiring harness manual and do it the exact opposite of what I did (i.e. You could plug everything in, route the factory plug to the megasquirt, then cut all wires and make that connector).

The factory wiring would have needed some lengthening for the injectors with the hilborn, and would not have been as clean of an install. But, of you're running 6.1 covers or similar, the factory harness routing would be ideal. That would be a good way to save money (if you mounted the ms3x box where the factory harness would reach, anyway). Lots of research figuring out the factory wiring colors though I imagine.