Okay, I think this is starting to sink in...thanks...
How my brain looks at this now is 14.75 PSI on the graph is zero vacuum or WOT and at that point there is no advance from the MAP sensor\boost retard curve. When the throttle is closed and vacuum increases, the graph moves to the left and the further it goes to the left the more advance is being added to the distributor. Furthest left is full advance at max vacuum at idle (based on your curve shown anyway).
Last night I drove the car with the laptop and vacuum gauge inside the car so I could watch. At idle and when at high vacuum when running the red line in the Boost Retard graph stays right around 7.00 PSI with the vacuum gauge at 20"
I never saw the red line go less than 7.00 PSI. So should I start the left side of the curve at 7.00 PSI or at 4.00 PSI as in your graph. And the bottom of the curve should level off at 14.75 PSI all of the time right?
The one thing I'm still fuzzy on, the relation of the 20" on vacuum gauge to 7.00 PSI on the graph.
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Lance
1985 Monte Carlo SS Street Car
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