Quote Originally Posted by Ron View Post
Oops. I was already with you on the why...didn't mean to imply cutting the advance off totally.
I was wondering about the how using Megasquirt -- I got ya with the emulating... Thanks!

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Maybe this will help-
This is a from the first warm run on a thoroughly beefed up engine in son's street car.
(Definitely not a PRV, but if something can go wrong, it will ;-).
Note the advance climbs after the accelerator is released and the advance drops sharper (for the first half).
It turns high 10s and is very well behaved (no exhaust/engine braking problems).

wot-idle.jpg
Your screencap from VCMscanner isn't very relevant here. Especially if he is just reving the engine in neutral.