Motec M84 - Ignition circuit
05-09-23, 08:49 AM
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Motec M84 - Ignition circuit
Hi, I am new to the M84 ECU. I am trying to understand how to manage the ignition circuit. If I understood well from a prior thread I should connect NE to ref and G to sync, is that correct?
However, I realized that the voltage spike that the crank angle sensor returns is very weak. Should I build an interface (a trigger) between the crank angle sensor and the ECU, such that the voltage that the ref and sync inputs in the ECU receive are 12V? Or is this managed by the Ignitor in the ignition system? And for the ignitor, do I just connect it to the ports A3, A4, A5 of the M84? Or it is not that simple?
Moreover, I can't manage to find a datasheet of the ignitor. What is the role of the furthest left connector? (the *) In the wiring diagram we can see that it is connected to the original ECU, but I can't manage to find anywhere a description of what each port of the original ECU does, so I am a bit lost.
And also, why are both leading spark plugs connected to the same coil? This means that they both produce a spark at the same time, but both rotors are shifted by 180° if i am not mistaken.
To sum up, I am a bit lost in managing the ignition. It would be nice if someone could help me out.
Here is a diagram of the wiring.
However, I realized that the voltage spike that the crank angle sensor returns is very weak. Should I build an interface (a trigger) between the crank angle sensor and the ECU, such that the voltage that the ref and sync inputs in the ECU receive are 12V? Or is this managed by the Ignitor in the ignition system? And for the ignitor, do I just connect it to the ports A3, A4, A5 of the M84? Or it is not that simple?
Moreover, I can't manage to find a datasheet of the ignitor. What is the role of the furthest left connector? (the *) In the wiring diagram we can see that it is connected to the original ECU, but I can't manage to find anywhere a description of what each port of the original ECU does, so I am a bit lost.
And also, why are both leading spark plugs connected to the same coil? This means that they both produce a spark at the same time, but both rotors are shifted by 180° if i am not mistaken.
To sum up, I am a bit lost in managing the ignition. It would be nice if someone could help me out.
Here is a diagram of the wiring.
05-13-23, 10:01 AM
#2
F'n Newbie...
iTrader: (6)
Ok, so a couple things here...
1) you should really be raising these questions with your dealer. Motec operates on a dealer network where only dealers can order the ECU's and each dealer needs to prove competence before being accepted. I assume you bought this second or third hand, in which case you'll need to establish a relationship with a regional dealer.
2) The M84 is now obsolete in motec's catalog. Even when it was active it was only an entry-level option. You'll REALLY benefit from returning this and buying an M1 series ecu instead.
3) Run some basic searches, this information is available: https://www.motec.com.au/m84/M84downloads/
4) Call motec themselves. They are REALLY GOOD about providing technical information over the phone! I called them while trying to decide what ECU to get and was connected to the actual engineer that does their rotary software in less than 5 minutes.
5) Motec is considered a "motorsports" ecu, this assumes that the end user has a degree of competence and experience (if not a dedicated race team). They aren't necessarily catering to the hobbyist.
1) you should really be raising these questions with your dealer. Motec operates on a dealer network where only dealers can order the ECU's and each dealer needs to prove competence before being accepted. I assume you bought this second or third hand, in which case you'll need to establish a relationship with a regional dealer.
2) The M84 is now obsolete in motec's catalog. Even when it was active it was only an entry-level option. You'll REALLY benefit from returning this and buying an M1 series ecu instead.
3) Run some basic searches, this information is available: https://www.motec.com.au/m84/M84downloads/
4) Call motec themselves. They are REALLY GOOD about providing technical information over the phone! I called them while trying to decide what ECU to get and was connected to the actual engineer that does their rotary software in less than 5 minutes.
5) Motec is considered a "motorsports" ecu, this assumes that the end user has a degree of competence and experience (if not a dedicated race team). They aren't necessarily catering to the hobbyist.
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Carlos Iglesias (05-14-23)
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