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

[Brendan Patten]

V8 module hard to find cheap.  I had a few 4cyl modules laying around.

Guess only option for this route is the 8cyl module.

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf Of WopOnTour
Sent: Sunday, October 01, 2006 10:05 PM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] dual 4cyl DIS module for v8 use?

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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