Reply to Squash's reply about What ECM should I use for my Mopar 440 conversion project?

[Brian Roth]

What is a P4 device? Does it still have a 24 pin and a 32 pin connector? Is
it externally tunable? Is a lap top and software required?

Brian

> ----------
> From: 	Squash
> Reply To: 	gmecm at diy-efi.org
> Sent: 	Friday, March 16, 2001 5:06 PM
> To: 	gmecm at diy-efi.org
> 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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> 
> 
> =====
> Trains, Trucks, and EFI at http://www.trailrunners4x4.org/users/realsquash
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