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Originally Posted by Samuel M. Ross
When I say ~15 in of vacuum, I'm talking about what it starts out at just before you first depress the accelerator and the vacuum switch on top of the valve cover brings the IP's Vacuum Control Valve [VCV] into the circuit and begins to bleed off the vacuum levels. On my car this initial drop in vacuum is to ~10 in just as you indicate. So we are talking the same number once this clarification is made. Some day FORUMs like this will allow me to attach a short digital video clip of my vacuum gage readings and an accompanying audio track explaining what's what.
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When I say 10" of vacuum, I'm talking about the setting at idle, simply using a Mityvac into the port. When you first depress the accelerator, the vacuum will start at 10" and begin to drop from there.
15" is too much vacuum, IMHO, and the transmission will shift fairly softly.......somewhat mushy.........under most driving conditions.
As I mentioned, the SD is currently set at 8" at idle.