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

[Bruce Plecan]

Nope the P4s use 3 connectors on the ecm.  It also uses a memcal, which is a
series of chips on a carrier.  Uses an eprom just like the C3s but are much
larger.   All the program info is on the memcal.
Bruce


----- Original Message -----
From: "Brian Roth" <broth at sanjuan.edu>
To: <gmecm at diy-efi.org>
Sent: Friday, March 16, 2001 2:24 PM
Subject: Reply to Squash's reply about What ECM should I use for my Mopar
440 conversion project?


> 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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