KitCarlson said

I have found a slight spring bias on the distributor drive gear, serves to minimize gear drive backlash. VW used this method in their drives, a simple fix.

While missing tooth gear sensor are more universal, the timing reference is virtual, and are less real-time due to Kalman filter, angle interpolation, and other processing. Updates in RPM occur at 1 or more revolutions.

My system acurately measures RPM on a cylinder basis, and adjusts for rate of change. Timing updates are done at the real leading edge of each cylinder reference signal.

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