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

[Squash]

I know, a 747 is a fine computer.  I think that a P4 would be easier to work with when starting on
a motor like a 440 that is presumably unlike any calibration currently out there.  But maybe this
one is tame enough that it wouldn't be a problem.  

I think the 95 ECM is nice, 32 blm cells (more forgiving at the beginning of tuning), 8192 ALDL,
runs TBI, etc.

I started tuning on a 730/aujp, and I've helped tune a 747, and it felt like stepping back to C128
instead of a PC.

But there are lotsa people that can/will help with a 747 calibration and it's fully hac'd.

All IMHO,
Squash

--- Bruce Plecan <nacelp at bright.net> wrote:
> 
> 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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