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Hmm, seems S65 coils works differently. According to: https://ia801005.us.archive.org/11/items/BMWTechnicalTrainingDocuments/ST709%204th%20Generation%20M3%20Complete%20Vehicle/04_MSS60%2520Engine%2520Management.pdf the ion signal is actually sent over the primary ground line, not over the secondary....

The S85 and 65 coils have a connection across the secondary winding while the other bmw coils I have do not. It seems most of the coils have a "spark booster" gap in them intended as an anti plug fouling measure. This makes reading a voltage across the gap in the secondary impossible. You...

We have done a little bit of work towards the valvetronic on the N52, I pulled apart a sensor and we found the data sheets that give the data protocol. N series is something we collectively would like to do but there is limited resource to apply to it currently. A little off topic, but: I don't kno...

I read through this thread, and am starting to process some of the academic papers regarding ion sense. So forgive me if I'm asking obvious questions. BMW S85 (and presumably S65, but it looks like they moved the electronics into the ECU) use dumb coils, and have electronics that apply the bias volt...