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russian
russian New Reader
12/18/18 9:11 p.m.
alfadriver said:

I *think* the second pulse is to run the ionization system.  

Nope, this signal originates in combustion detection module and goes into ECU, not to the coil. This is CDM telling ECU whatever it's telling ECU, and I wonder what is it telling ECU under which conditions so that I can use this signal in order to tune engine.

russian
russian New Reader
12/23/18 8:49 p.m.

https://www.youtube.com/watch?v=ZaqVyCWncFc

 

Seem to match a picture from https://www.diva-portal.org/smash/get/diva2:158518/FULLTEXT01.pdf once you flip it - we might be able to have angle of peak cylinder pressure in the logs or on a gauge 

 

russian
russian New Reader
12/31/18 9:25 a.m.

Got it! it was a lot of fun but now I know how to have my Miata knocking while standing still! And ion sense hardware is definitely producing the signal!

https://github.com/rusefi/rusefi_documentation/tree/master/misc/Saab_Trionic_8_Combustion%20Detection%20Module_on_Mazda_Miata_running_rusEfi

https://www.youtube.com/watch?v=g6YsVTBH334

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