Converting a Mopar 440 to GM TBI translated

[Squash]

Maybe using the 94/95 truck ECM would be a good idea?  TBI, P4, 32 BLM cells, etc.  Would be
easier to get feedback from the ECM i'd think.  

Squash

--- Shannen Durphey <shannen at grolen.com> wrote:
> Don't forget the little 2.8 tbi.  It's got reeealy tiny bores.
> 
> The tbi used on the 454 is small for the engine's size.  Using something smaller
> still would reduce the overall power made by the engine.  Your 440 may truly suffer
> if you were to use a tb sized for a small block engine.  The actual hp rating of
> the tbi 454 is around 220.  With a 350 sized TB, you likely won't draw enough air
> into the engine to generate numbers that high.
> 
> One option is to find someone with access to a machine shop and see if you can get
> the throttle bores machined larger.
> 
> There are adapters available from Holley and GM (and maybe others) which will allow
> the throttle body to be bolted to a 4bbl manifold.  The GM part is fairly spendy if
> purchased through the dealership.
> 
> You migh consider using a Chrysler electronic ignition distributor with a GM
> ignition module.  You will need to permanently prevent the vacuum and mechanical
> advance mechanisms from moving in order to take advantage of the ecm;s ability to
> adjust spark timing.
> 
> Beyond any doubt, the best ecm to use is the 1227747, which was used in most 8 cyl
> tbi pickups, and some 4.3 v6 applications.  Search the gmecm home page, there's a
> ton of info about it, and there are many free tools to help tune it when you're
> ready. 
> 
> Cadillac tbi systems can have subtle differences from other GM systems.  Sometimes
> they have no IAC to control idle speed, but use an external motor to open the
> throttle.  This scheme is not designed to work with a "regular" GM tbi ecm.  I have
> not heard of anyone adapting the Caddy system for use with a 7747 or one of its
> cousins.
> 
> Download and look through the diy-efi archives.  There are plenty of war stories
> and more than a few different versions of this same question there.  You'll find
> more information than you want to know, and you'll probably end up with a few new
> ideas before you're done.
> 
> But by far, the best answer for the simplest swap is to locate a complete TBI
> equipped 454 and get all your parts in the same place.  Any other option involves
> more time, effort, and research.
> 
> Shannen
> My clock says 8:36pm...
> 
> Jove Malcolm wrote:
> > 
> > as a real quick answer, theres two major TBI units gm made. one was found on
> > the 4.3's and 305's and 350's. flows like 500cfm or something around there.
> > Then there is the bigblock TBI unit, with 2" butterflies. this is what all
> > the aftermarket units are based on.
> > ----------------------------
> > Jove Malcolm / TheDrip
> > drip at home.com
> > ICQ: 6778499
> > http://www.sendon.net/~drip
> > 1989 Chevy Blazer
> > 1980 Pontiac Trans Am WS6
> > 1960-1990 Combined pile of rust
> > approximately the size of a vehicle
> > 
> > ----- Original Message -----
> > From: <ECMnut at aol.com>
> > To: <gmecm at diy-efi.org>
> > Sent: Wednesday, March 07, 2001 7:08 PM
> > Subject: Re: Converting a Mopar 440 to GM TBI translated
> > 
> > > I want to install a GM TBI system on my
> > > 1978 Dodge motorhome with a 440.
> > > I think that something similar to what
> > > was used on a 454 would work pretty well.
> > > I am trying to pinch pennies so I do not
> > >  want to spring for a setup taken
> > > directly off a 454.
> > >  My brief research
> > > seems to indicate that there
> > >  was only one GM two barrel throttle
> > > body made,  the model 220, which was
> > > used on everything from V6's to 454s.
> > > I want something close to what was used
> > >  on the 454 but fuel injected 454 components
> > >  are not available at the price I am willing
> > >  to pay.
> > > Could I get the throttle body from, say,
> > > a Cadillac 4.1, add injectors designed for
> > > a 454, use the harness, computer and sensors
> > > from a 4.3 V6 or 2.8 V6, distributor from the
> > >  Caddy 4.1(modified to work on the 440)
> > > and be ready to rock and roll? It seems that
> > >  I may not want to use all of the Caddy 4.1
> > > setup because it is Digital Fuel Injection.
> > > I have installed a 1988 Mustang 5.0 EFI motor
> > >  in my 1983 Mitsubishi pickup complete with Mustang
> > >  rack and pinion steering and a disc brake Dana 44
> > >  from an Isuzu Trooper. I know this conversion
> > > involves the four letter word F-O-R-D but it
> > >  does work pretty good.
> > > I mention this mainly to indicate that I am willing to
> > >  modify things to make them work.
> > >
> > > Let me know what you
> > > think if you have the time.
> > > Brian Roth
> > > broth at sanjuan.edu
> > > --------------------------------------------------------------------------
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> > >
> > 
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=====
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