The delay is in the electronics themselves ...
So glad you are posting about this. I felt like I was the only one here. And although I'm sure that's not quite true, it does seem like a secret. A stock class racer first told me about how the car always slower when they took out that heavy secondary spring from the DC distributor. I didn't learn the real reason for most of the delay until much later.
This is the reason for the solid line and the dashed line in the Direct Connection graph in post #11 here:
https://www.forabodiesonly.com/mopar/thr...post-1972040585In theory the timing could increase (depending on the spring perch setting) but on a slow ECU, its flat, which is still a hell of a lot better than losing timing.
They set up the heavy spring and weights to counteract the delay in electronic switching (sometimes called slew rate). Every electronic operation takes time.
This secondary portion of the advance can't be done with all advance mechanism. That's with the MSD, my suggestion for Dave was to set it up to delay the 'all in' to a higher rpm. That way the slew will have less effect through the top of your power curve.
https://www.tapatalk.com/groups/racingfu...-less-t765.htmlMore links on slew in
Innova 3568 Timing Light, now slew rate Yes, that's half of it. It's not really a secret, just to many people read to much of the internet and drink the koolaid!
It's all marketing.
The other half of it is the get the correct timing at a given rpm.
A 906 Mopar head will not make it's most power at 4,000 with timing set at 38
A 15 degree Brodix head wants like 22 degrees at 4,000 rpm and 28 degrees at 7,000 if that tells you anything
With a locked out distributor you have a backwards curve when you add in the slew rate, so the motor is off at all rpms
A 602 GM crate motor makes max power at 34 degrees. So when these guys lock their distributors out and run them on the dyno they have to set the timing to 39 degrees to get max power. Well 39 - 5 degrees of slew rate = 34
But this destroys power below the max power rpm
