Found this in travels on the interwebs
Sort of handy, even if just to play and learn from.
Knowing the Gemini has a static timing of about 8°
Depending on age of dizzy, mechanical advance of about 10° and much the same for VAC advance.
I could punch the numbers in and have a play
spark advance calculator
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antus
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Re: spark advance calculator
Thats a nice spreadsheet to visualise all the numbers. Im going to move this to tools, and sticky it. I think others doing conversions without a matching factory calibration will be able to use this to get a starting point.
Thanks to our friends at thirdgen.org for creating it!
Thanks to our friends at thirdgen.org for creating it!
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
Re: spark advance calculator
Yeah not sure why I posted where I did 
If you had the info for an old dizzy you could probably get a good safe table out of it. Even if its rpm is backwards
If you had the info for an old dizzy you could probably get a good safe table out of it. Even if its rpm is backwards