Does anyone know what happens to spark latency above 6400 rpm in 727/730 ecm?? I am running $8D, with ARFP/AUJP modified bin. Does the last value in the table in the bin continue or does it go to zero, because there's nothing there when the ecm does its final SA calculation??
I rev my solid roller 383 to 6900-7100 rpm. I am running a Dynamod ignition module in a small cap dist. I am also running a MSD Digital 6 ignition box. I have called performance distributers (the makers of dynamod module) along with MSD and they dont even know what I am talking about when I mention latency. I have read most of the posts here referring to different values in the tables, but I havent seen anything referring to high rpm above 6400. I know I can manually check commanded value in Tunerpro vs the actual SA on the crank, but I'm not so comfortable free revving my engine to 7000 rpm in my driveway..
Thanks in advance.. I have learned so much here, but this one has me stumped..
Sal

 

It will use the last value in the table. This is how all of the tables in the ECM work. At above or below the last or first axis value, that row/column is used.

You don't want to rev the engine to 7K RPM while leaning over it with a timing light? I've seen that before, BTDT. That is not wanting to lean over the engine at high RPM. There is a good thread on SA latency, the link is in the Tuning Guide Book sticky, chap 5, '8063/8746/7747 ECM section.

RBob.

 

Thanks for the tip RBob!! I'll reread that article... Have you or anyone tested the latency values for a DynaMod Ignition module?? more specifically part number 000444??

When I called Performance Distributors to ask them their latency values they didnt know. I then asked if their module was made to resemble latency values of a GM "369" module or a "048" module.. the person had no clue what I was referring to.
Thanks