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

[Brian Roth]

That cruisers web site is very cool. Thank you very much. Do you know to
what all the body type letters refer? I think S is for S-10's but what are
the rest for. Which letter is for Astro Vans? The site showed the 7747 to be
in truck 4.3's with various letter designations. It did not state that it
was in vans. Is the Astro considered to be a truck for this purpose? If so,
what is it's letter?

Brian

> ----------
> From: 	steve ravet
> Reply To: 	gmecm at diy-efi.org
> Sent: 	Friday, March 16, 2001 6:08 PM
> To: 	gmecm at diy-efi.org
> Subject: 	Re: What ECM should I use for my Mopar 440 conversion
> project?
> 
> 
> 
> Brian Roth wrote:
> 
> > 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.
> 
> 
> I think the 747 would be a perfect place to start.  It'll be in full
> size pickups and Astro vans, but not S-10s.  Check Ludis' WWW page for
> applications and years (www.cruzers.com/~ludis).  Doesn't matter what
> engine the ECM itself is from as long as you have a calibration and
> calpak or whatever it is called from a V8.  The "car" equivalent of the
> 747 has a very similar pinout although not exactly the same.
> 
> > 
> > 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?
> 
> Jason Weir has a WWW page about injecting his CJ-7
> (http://home.att.net/~jweir/home.htm).  Here's what he said about the
> distributor:
> 
> Distributor - As for the distributor, If your vehicle doesn't already
> have one, you will need one with a magnetic pickup. From my experience
> the
> GM ignition unit is not very picky about what type of pickup is used. In
> my Jeep I used the stock distributor and just added a GM connector to
> the
> wires so they would connect to the ignition module.
>       The distributor must also be modified so that the vacuum and
> centrifugal advance mechanisms not longer function. With this swap the
> computer
> will have complete control over timing once the initial timing is set.
> 
> I know there have been other Chrysler conversions...  Have you been thru
> the archives?
> 
> 
> -- 
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
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