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Thanks Brian, I suspected that this would be the correct formula.

Thanks Miles, I have read this info in the knowledge center.
Jeff

I don't know what IIRC means. All I want to do is calculate actual timing at any given point in advancefrommapwarmfull.

Brian, that is a surprise, that would never have occurred to me. In the knowledge center, shelgame talks about total timing being calculated by adding basic timing + advance from RPM + Advance from...

I noticed that in a tune that I have that is NOT a turbonator tune, advance from rpm max graph line starts out at low rpm with high advance, for example 900 rpm might be at 54 degrees and 7000 rpm...