Just to make sure I'm clear, one question. If I set the distributor at 42* with no curves, then put the two curves in you showed above...my timing at idle would be 18* correct? Run retard pulling 24* out at 900 (42-24=18).
If I wanted more timing at idle, I'd do your curves above except raise the run retard at idle to say 10* (42-10=32*). The question then would be what to do with the run retard curve from 1000-2500 RPM?
The Boost Retard curve you posted would pull 10* out when vacuum drops, how much more would we need the Run Retard to pull out at cruise to keep it from pinging is the million dollar question...
Cruise is generally between 1300-1800 RPM just FYI.
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Lance
1985 Monte Carlo SS Street Car
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