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The reason why the the crank position sensor is around 66 degrees BEFORE TDC is that it makes it easier for the computer to register TDC with an early "heads up". Having the sensor before TDC gives the ECU early warning that TDC is rapidly approaching. It's important to have this around that degree of separation because with a lot of noise coming from electrical components and the ignition system, the ECU can easily lose sync.
To run a sequential ignition setup you will need both cam and crank inputs.
As far as the crank position sensor, you want about a 1.5-2mm air gap between the crank trigger wheel and crank sensor.
Last edited by FrontGarage911; 07-14-2021 at 04:18 PM..
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