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

[WopOnTour]

The EST signal directly controls the coil triggering, but it's created 
directly from the IGN REF signal from the DIS module (sourced from it's CKP 
sensor input) and time/phase shifted to create the appropriate advance on 
the "next cylinder"
Where are you proposing to connect the SECOND CKP input?
AFAIK what you are proposing would require 2 ECMs as you would require 2 
independent IGN REF signals in order to create a pair EST signals phased 90 
degrees from each other.
Why wouldn't you just use an older V8 DIS module? (Like the maybe the LT5 
version)
HTH
WOT
----- Original Message ----- 
From: "Brendan Patten" <bpatten at centurytel.net>
To: <gmecm at diy-efi.org>
Sent: Sunday, October 01, 2006 8:30 PM
Subject: [Gmecm] dual 4cyl DIS module for v8 use?


> 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?
>
>
>
>
>
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