[Gmecm] dual 4cyl DIS module for v8 use?

[Brendan Patten]

Okay, here's what I got going on.

2000 model Vortec 5.3L Gen III small block.

I want to use a 1227730 ecm with $8D code to control injection and
ignition on this.

I have already successfully changed the $8D code to work with DIS
ignition on my 3.1L v6.


I want to mount a 7x trigger wheel behind my harmonic damper, and mount
two crank sensors, 90 degrees apart.

I want to use two 4cyl DIS modules.

This should work to run wasted spark on the 8 cylinder.  The 4 cyl
modules spark every 180 degrees.  By placing second sensor 90 degrees
after first, I will now have spark every 90 degrees, alternating back
and forth from module to module.

Question I have is on the EST signal back to the module for timing
control.

Is this signal used only to tell the module at what advance to do, or
does the pulse from the ecm occur exactly when spark is desired?