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Old 10-11-2012, 09:38 AM
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here is an example of a boost retard curve file with vacuum advance. the base timing was set to 42 blower was building about 5psi. our Atmospheric pressure is at 12, so yours may vary.
you will need to set your TOTAL timing first with your distributor locked out. If you will be taking more than 18 of timng away I would highly recomend using a phaseable rotor in your distributor.
Now, since i'm running vacuum advance both the retard from the MAP curve and the RUN curve will add to each other. I fine tuned the timing on the vehicle while someone else is driving.. do this at your own risk, never drive and use a computer at the same time!!
Attached Images
File Type: jpg 6530 vac-boost curve eplained.JPG (235.5 KB, 176 views)

Last edited by msdtech27; 10-11-2012 at 09:45 AM.
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