[Diy_efi] Mopar tuning?

[David M. Ingebretsen]

Thanks Clair.

_______________________________________

David M. Ingebretsen, M.S., M.E.
Collision Forensics & Engineering, Inc.
2469 East Fort Union Boulevard, Ste 114
Salt Lake City, UT 84121

801 733-5458
dingebre at 3dphysics.net

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-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Clair Davis
Sent: Friday, September 15, 2006 7:48 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Mopar tuning?

The main issues I had (and which may not apply to your project) were the
following:

IAC wiring - had to sort out hi/lo coils and the Mopar wiring diagrams
don't list them that way.  +/- for each coil is easy enough, but I
rolled the dice on which was hi/lo.  Shouldn't be an issue, but it's a
matter of swapping 4 wires around to fix it if I need to.  This ASSumes
a stepper motor IAC, not the Ford-type thing.  Since you're talking
Jeep, which was and still sort of continues to be its own thing,
ANYTHING could have been used.  Lots of AMC heritage clinging to that
division, and all the EFI control units for the trucks were developed by
the AMC/Jeep engineers.  Vastly different architecture than the pass car
controllers.

TPS function & wiring - My original GM TPS wouldn't bolt up to the
aftermarket Mopar throttle body (go fig), and the TPS I needed was
"handed" opposite from the OEM Magnum TPS.  That is, the throttle shaft
twisted CW rather than CCW, for example.  Found an earlier pre-Magnum TBI
TPS that
did the job, and even shared the GM connector.  Had to swap a couple
wires, though, and many of the Mopar TPS's aren't adjustable.  I'm
thinking the Mopar PCM reads the initial resistance and sets that as the
baseline.  I hope that's not a problem with my 7730.

MAP wiring - just a matter of making sure the wires in the connector are
correct for the sensor, and that the plug fits.  Another non-problem.

Clair


----- Original Message ----- 
From: "Scott Peitzsch" <jlg-sep at comcast.net>
To: <diy_efi at diy-efi.org>
Sent: Thursday, September 14, 2006 9:30 PM
Subject: Re: [Diy_efi] Mopar tuning?


> > Great idea. I've thought about it a lot. Custom EFIS has a MPI
conversion
> > kit based on GM parts for about the same price, too.
> >
> > I think the real reason is because I'm tired of trying to kludge the
> > components together. I like the idea of putting the Mopar unit on with
the
> > Mopar PCM because it was designed to work together. I'd jut like to
retain
> > the fun of tweaking the calibration :)
>
> Kludge what together?  You already have everything you need with
> the '747 setup on the engine now.  You don't need anything from
> Custom EFIS at all - just the sensors and controls that are already on
> your engine.
>
> The IAT and CTS sensors are the same.  The TPS from your TB can be
> moved over if you like, or you can use the one for the Mopar TB, as long
> as you use the existing 5V reference.  The IAC is the ONLY issue, and
> its a trivial one at that.  You may have to use one of the external IAC
> mounting kits, like those offered by Street and Performance.
>
> If you can buy just the intake, throttle body and fuel rails from Mopar,
> and source the rest from the local junkyard, you're going to be dollars
> ahead AND end up with a better system in the end.  The bonus is that
> you don't even have to replace the engine harness - just repin the ECM
> connectors (same pins, 2 of the three connectors are the same '747 to
> '730) and rewire at the intake/TB.
>
> -Scott
>
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