Thread: Anyone used Megasquirt before

I got the wideband working properly tonight. It turns out that I was supposed to have a capacitor wired in to the analog wire and sent to ground to keep the "noise" at bay. I was using the wrong wire to go to the MS unit as well. The connector on the PLX wideband has wideband, narrowband, ground, and 3.3v. The 3.3v goes to the afr gauge (which is killer because I hated getting rid of my gauge), the wideband went to pin #23 on the MS along with the capacitor that came with my PLX (luckily I kept it in a safe place that I could actually find), and the ground went to pin #19 along with a ground coming from the capacitor.

So in short, I recommend checking the schematics for your particular wideband instead of relying on what you think you know or even the megamanual.

Another update on this.

Today I basically put the board back to the way it was when I received it. It had dual ignition outputs, meaning that I could have directly driven two coils instead of using the EDIS module and only one output. Power wire to the coilpacks, coil A ground to pin 36 on megasquirt and coil b ground to pin 6 on megasquirt. Simple enough, you do have to change a bunch of settings in Megatune but that's no biggie. Here's a link to the MS forums describing the situation. Megasquirt MSEXTRA / MS3EFI • direct drive edis coil (View topic)

With the board set up this way, you have complete control over spark for things such as launch control, rev limiters, etc. With the EDIS module, you couldn't cut spark, only fuel.