Continuing ignition timing debate from the 416 thread.

Newbomb Turk said

What I am saying is you can’t, with a sweep test determine what the engine wants or needs or however you want to say it what a proper timing curve would look like.

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Still having a hard time wrapping my head around this. You can't use a sweep test on a dyno set an ignition curve because it sweeps too fast and the power changes you see won't be accurate enough to determine a curve. But, you can use a dyno in a sweep test to determine if you made any gains when you change the curve?