Custom reluctor ring, suggestions on where to get one

DionR said

This is a Hall Effect sensor, I thought those were pretty much instantaneous?

So what you are saying is that it's the distance past the edges that is the issue, and the diameter of the wheel won't change that distance, even though the number of degrees it rotates will change to get the distance.



Here is what I got from a Mopar engineer years ago in this regards:

"The good news is that it's much simpler than you are thinking. The JTEC is counting on/off pulses. It doesn't care about the width. If you carve 8 equally spaced notches in the pulley/tone ring, then the JTEC will be happy.
Try and line up your new crank trigger to a notch the same time the OEM crank trigger is on a notch. You should have good luck. You will need to adjust the timing by trial and error, but a trip to the drag strip will find the best setting."

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Sounds like they only use one edge, the rise or fall, so it should work. I assumed in error, that both edges used. It would be nice to know which edge is used for static timing settings. By capturing the distributor sensor, crank sensor, and coil primary signals on multi channel scope or logic analyzer, will help in your static setup of front sensor.

Standard Hall sensors generate a low signal for metal target viewed by sensor, and a open collector high, with open slot. A pull-up resistor to 5V is supplied by ECM. This will let you easily know what to align.