Megasquirt 3 assembly

Ask questions about DIY board assembly issues, fault finding and testing. (Covers all Megasquirt versions and board.)

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Megasquirt 3 assembly

Postby Smorris » Fri Dec 01, 2017 8:21 pm

Letting everyone know before hand I am extremely new to this and have barely developed a basic understanding of what I’m doing. However I am assembling a diy kit for megasquirt 3(non mapdaddy) and I’m at the point where I need to make my jumpers according to what I want/need. And honestly I’m not exactly sure what’s the best option for me to do. Am I using engine ignition output for my coil module. Just basically wanting to know what exactly should I do and what’s the best thing to do. The engine is S52 (1999 M3 obdII)
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Re: Megasquirt 3 assembly

Postby billr » Tue Dec 05, 2017 12:16 pm

I'm taking a guess here: this is a BMW with 60-2 crank wheel and VR sensor? What kind of IAC, stepper or PWM? What kind of ignition coils do you want to use, single, wasted, or COP? Do you want the coil drivers inside the MS box or external?

Let's cover the easy one first. On the mainboard, jumper the "TachSelect" pad to the "VRin" pad. Also jumper the "Tsel" pad to the "VRout" pad. That jumpering is used for virtually everything except triggering from ignition points. Adjust the two potentiometers (pots) on the mainboard full CCW and you should be all ready to get sync and read rpm in TunerStudio.

More jumpering will be needed for the IAC and coil outputs, but we need to know what type IAC and coils you have.
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Re: Megasquirt 3 assembly

Postby prof315 » Wed Dec 06, 2017 4:33 am

Most E46s use a Hall effect CKP NOT VR, the IAC is 3 wire PWM and the coils are dumb (no ignitor built in). If the trigger wheel is part of the flywheel the CKP is Hall Effect if it's on the harmonic balancer the CKP is VR
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