GM Module timing curves

[damanx]

Well, now that I have a new 350mhz dual time base scope, I might be able to look at some signals when I can make the time, and, after the spare ecm shows up. (Don't want to be destroying the only ECM at the moment.)

And, this spark latency is something that I think has been giving me a little grief on my tuning.

[notime2d8]

Any more info on this...? I bought one of the cheap Ebay distributors with a unidentified module...i'm thinking i should replace it.

[jdarg]

The *only* to know its correct is to try to map out the timing vs. RPM at the crank w/ a light and correct it in the latency table. I don't think mine was > 2-3 degrees out though and that was only in a couple of spots so depending on your goals (this is a Jeep and I'm not concerned with ETAs) it might be splitting hairs.