I picked up a spare 55 pin megasquirt from diypnp designed for a stock m20. I pulled the cover off and it has 3 BIP drivers for wasted spark on a 6 cylinder.
I also have an m42 318is and am hoping to get the car running on the ms unit. I have looked over the wiring pinouts and it looks like for the most part I can get the m42 to run on the ms unit. There are a couple of problems I have found that I need to address.
1. Ignition system - The m20 uses a single coil while the m42 uses 4 coil packs. I only see one pin for the coil from the m20 pinout while the m42 needs either 4 individual drivers or 2 drivers for wasted spark. If I do wasted spark, how does the ECU know which coil set to fire? Is it via the cam sensor on the m42? How do I determine which input the ms unit is expecting? Do I need to change wiring to make it work or can I just select the coil on plug option from the ignition menu?
2. Cam sensor - Do I need to wire in the cam sensor? The m20 obviously works without one but uses the cap and rotor. What signal is the ms unit looking for my engine?
3. Knock sensor - The m42 comes with an knock sensor on the e36 motor, if i have to add something for sequential ignition, should I add something for a knock sensor? Where do I install that?
Besides that, I think I can just compare the m20 pinout to the m42 and link everything else together with an adapter, right?
I also have an m42 318is and am hoping to get the car running on the ms unit. I have looked over the wiring pinouts and it looks like for the most part I can get the m42 to run on the ms unit. There are a couple of problems I have found that I need to address.
1. Ignition system - The m20 uses a single coil while the m42 uses 4 coil packs. I only see one pin for the coil from the m20 pinout while the m42 needs either 4 individual drivers or 2 drivers for wasted spark. If I do wasted spark, how does the ECU know which coil set to fire? Is it via the cam sensor on the m42? How do I determine which input the ms unit is expecting? Do I need to change wiring to make it work or can I just select the coil on plug option from the ignition menu?
2. Cam sensor - Do I need to wire in the cam sensor? The m20 obviously works without one but uses the cap and rotor. What signal is the ms unit looking for my engine?
3. Knock sensor - The m42 comes with an knock sensor on the e36 motor, if i have to add something for sequential ignition, should I add something for a knock sensor? Where do I install that?
Besides that, I think I can just compare the m20 pinout to the m42 and link everything else together with an adapter, right?
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