13BT DEI 1989 (RX7) Ignition circuit

[Jfunesa]

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.

[NathanB]

Hi,

Yes, Ne to Ref and G to sync.

This information is covered in our datasheets. M84 is the same conventions as M800:

https://www.motec.com.au/filedownload.p ... docid=1284

https://www.motec.com.au/filedownload.p ... docid=1281

For ignition:

https://www.motec.com.au/filedownload.p ... docid=1245

https://www.motec.com.au/filedownload.p ... docid=1251

In regards to the ignition system, seeing as the ignition system is possibly 34 years old it may be worth considering converting to 4 coils with built in ignitors and running the system direct fire.