What ECM should I use for my Mopar 440 conversion project?

[Bruce Plecan]

Why?
747 is a nice basic computer.
For a motorhome, ANYTHING is going to be better then a Carb.
Motorhome ain't gonna be doing any rapid transistions, and sudden alttitude
changes, or RPM changes.   I'd think the C3 might have alot of advantages,
none of less the 747 is fully commented and lots of willing to help folks
have used it.
Bruce




----- Original Message -----
From: "Squash" <realsquash at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Friday, March 16, 2001 12:06 PM
Subject: Re: What ECM should I use for my Mopar 440 conversion project?


> I would try wiring in a 95 pickup ECM or some other P4 type device, even
if you have to change
> injector drivers.  I just cannot fathom tuning something like that with a
747...
>
> Squash
> p.s. tunercat has a TDF for the 95 truck
>
> --- Brian Roth <broth at sanjuan.edu> wrote:
> > I have sourced a wiring harness for my Mopar 440 to GM TBI conversion
> > project. It looks like I will be getting the harness from a 4.3 Astro
van.
> > According to my research using AllData's wiring diagrams the 4.3, 5.7
and
> > 454 harnesses are essentially the same. It looks like I may have to
reroute
> > a few wires. I will probably be getting all the sensors as well and I
will
> > attempt to use the Astro van fuel pump suitably modified for external
use as
> > I have done with my Ford 5.0 EFI powered  Mitsubishi pickup.
> >
> > Now I need a throttle body (which I think I have located) and an ECM.
> >
> > Which ECM should I use? Can I use one from a 4.3 Astro or S10 or do I
have
> > to have one from a V8? Doesn't the computer determine engine speed from
the
> > distributor which would make it off by two cylinders if it counts every
> > pulse if I use a 6 cylinder ECM on an 8 cylinder? Do I need an ECM for a
> > truck?   It looks to me like the truck ECM's and the car ECM's do not
even
> > have the same connectors.
> >
> > How about the distributor pickup? Someone wrote me that I can put a GM
> > pickup in my mopar distributor. Can I use a pickup from a  4.3 or even a
2.8
> > for that matter or does it have to come from a V8. How about a Caddy
4.1? Do
> > I have to start with a mopar dissy that has no advance or can I just
disable
> > the mechanical and vacuum advance on my current dissy?
> >
> > My primary goal in doing this conversion is to improve the fuel economy
on
> > my motorhome which got 5 mpg on our last trip but should get about 7 mpg
> > with a properly tuned carbueretor (Now using a Quadrajet instead of the
> > stock ThermoQuad). I am hoping for about 9 mpg after the TBI conversion.
> > What kind of mileage does a 454 TBI powered rig get when it is working
hard?
> >
> > Brian
>
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