He is a great and trusted tuner, so any info from him can be taken as correct. He said its straight off the S13 KA24DE ECU. This may be stuff you already know, but better to cover everything in one thread. Then you can fire up the engine and let it idle, megatune shows you what your current spark advance is and you can verify with the timing light on the crankshaft. Then you crank the engine and rotate the dizzy until you see 10 BTDC on the crank timing mark with your timing light, that calibrates the trigger angle, then you go back in and set fixed angle to -10 which turns off fixed angle mode and lets you run from your table again. Ignition timing is tough to understand, but easy to adjust and set.
The idea is that you set the trigger angle to say 78 degrees, then you entered a fixed angle of 10 degrees just for setup purposes. Example: if you want to run total timing of 40 degrees somewhere in your spark table then you need a trigger that happens before 40 degrees, like 50 degrees. You set up your own trigger angle, so you can set it at 78, 59, 53, whatever you want as long as it triggers ealry enough to allow for your max advance. v2.2 requires the pullup resistor, v3 maybe it doesn't need the resistor? From my understanding either the v2.2 or v3 megasquirt will work with the optical trigger input. Your question on hall sensor for tuning confuses me a little. Yeah, I couldn't find it by searching either.
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