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Really strange trigger issues

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2 reluctor sensors gapped at around 0.75-0.80 mm

I need lower threshold values at higher rpms than at lower rpms to get correct readings.

At 1000-2000 rpm it works fine with 2-2.5v threshold and filter at level 3.

But in order to stable readings without misfires or trigger errors at 6000 rpm I need to lower filter to 1 and reduce threshold values to minimum, 0.2v!

I tried different sensors (these ones are new), different cables everything… still the same.

It seems kind of backwards? It seems I get lower voltage values at higher rpm’s… how can that be.

Could switched + and – cables to the sensor make a reverse reading like that?


Any ideas? It's hard to scope the signal with the car running.

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At higher RPM the signal can sometimes drop off a bit but nothing to the extent of needing trigger levels that low.

Really need to get the scope on there to look at what is coming into the ECU.

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