Custom reluctor ring, suggestions on where to get one

KitCarlson said
It is harder than that. The diameter must shrink, and it is not possible to just scale it down. The sensor diameter influences the trigger points, so the sensor output does not exactly track dimensions of openings and tabs. The electrical signal duration shrinks for openings, and extends for tabs. The ECU, is very application specific, so signals need to be very close to OEM, or there will be problems. Yes it is possible, you just have to understand sensing methods, and make adjustments, in ring design and or sensor choice.

Huh? Why would it care if it was 5 degrees of rotation on a 12 inch wheel versus a 12 foot wheel? As long as it was the same number of degrees, how would it know? It's late so maybe I am missing something, but if they are both rotating at the same rpm, there wouldn't be any difference between the rise and fall of the signal, right?

Not trying to be argumentative, I know you have far more experience in this, just not seeing how the ECM would even know.

Here is what I know about the stock Magnum system. The flex plate I measured was 11.75" in diameter and the notches where .4" wide. This calculated out to almost exactly 4 degrees of rotation. I also know that a manual trans motor uses a different pickup than an automatic trans motor, and the difference is in the length of the sensor, suggesting that the diameter of the ring on a flywheel is different than that of a flex plate. Don't have data on the flywheel so I don't know how it compares.

Not certain, but seems like I have been told that the Magnum ECM only cares about one edge of the notch.

Also, I am aware that the notch can shrink to where the computer can't see it, so I am being careful to avoid that.