Adapting 55 pin M1.3 Megasquirt to 88 pin M42 engine harness

[downforce22]

I have been looking into running my 318is on megasquirt (in preparation for turbo). I was hoping I could get some help with a couple things on the wiring between the two engines.



I have DIYPNP MS2 unit with 3 BIP373 drivers and I know I could add one more driver and wire in the cam sensor to make it run. I tried to trace the pinouts and was wondering if any of you could verify my wiring connections and answer a couple of questions about the ignition settings. Here are the two ETMs that I was using to verify my connections, one is for the e36 m42 with maf so slightly different from e30 m42. See attached for where I am at. I also used the 55 pin table from nando's 325ix website to compare to m1.3 wiring.


http://www.armchair.mb.ca/~dave/BMW/e30/e30_92.pdf
http://www.armchair.mb.ca/~dave/BMW/e30/e30ix_90.pdf


1. How do I power the coils? Looking at the ETM these are run individually, as sequential ignition. I have 3 drivers. Can I just set up for wasted spark using 2 drivers as is?

2. In order to run wasted spark, do I need to utilize/ add in a provision for the cam sensor?  How does the engine know when to fire each back? Is that why the cam sensor is required, or can it just use the crank sensor without the cam sensor wired up? Will I need to run Dual Wheel with missing tooth? Or can I use the Cylinder ID sensor with the connection from the cam sensor on the m42?

3. Do I need to tie all of my grounds together? Or can I just pick a ground and match it up with another ground between the two ecus?

4. The m42 uses a 2 wire ICV while the M20 uses a 3 wire. I am left with only one input for the ICV currently on the m42 harness. Can I set it up similar to the 3 wire and just set the % open value in tunerstudio to get it to modulate between that and 0 when it goes into idle mode? Essentially i would calibrate the ICV as an open only type unit and would find where that open point is, if that makes any sense. I missed it above but pin 29 needs to go to pin 4 (or pin 22 depending) on the m1.3 harness.

5. I know the wires of the TPS need to be changed from WOT switch style TPS to the variable that the m42 runs. But when I look at the ETM, the m20 engine doesn't show which wire is the ground. Does pin 12 go to 52 or 53? Same with pin 59. Is the tps ground shared with the afm ground or similar?

6. Does the diagnostic port need to be connected? I am not sure those do anything, Is that to the port under the hood for resetting the oil light etc?

7. Does anything else look backward or like this wouldn't work? I think the coils firing correctly and the icv are the hardest part of making this work.

8. Do any of these wires need to be shielded? How do I go about doing that?