[Gmecm] RE: Gmecm Digest, Vol 12, Issue 21

Tue Feb 14 18:36:59 UTC 2006

My apologies, I didn't catch that it was a DIS setup. I can't speak for
that code set, but for the '7747 TBI on a small block V8 setup, you want
VSS so it controls idle properly, among other things. Searching the
archives will yield a bunch of information (and probably bickering)
about it.

On the 250, I'm not talking about the newer, small-cap, 8-pin HEI module
with the external weatherpack/metripack connectors built onto it, I'm
talking about the large cap, 7-pin HEI module, which has a
four-conductor harness that drops out of the distributor housing similar
to the other three wire harness that plugs into the cap.
(http://www.performancedistributors.com/modules.htm has pics of both
modules, and both distributors can be seen at
http://classictrucks.com/tech/0402cl_tpi_16_z.jpg) To convert a
non-computer HEI distributor to use that module, you'd have to grind
away a little of the distributor housing to allow the additional harness
to exit the housing.  But again, if you're going with DIS, then that has
nothing to do with it.

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf Of gmecm-request at diy-efi.org
Sent: Tuesday, February 14, 2006 12:00
To: gmecm at diy-efi.org
Subject: Gmecm Digest, Vol 12, Issue 21

   1. TBI Swap - Iron Duke Tech IV (Andrew Gibson)
   2. Re: TBI Swap - Iron Duke Tech IV (Aphelion79)

----------------------------------------------------------------------

Message: 1
Date: Mon, 13 Feb 2006 13:00:11 -0800 (PST)
From: Andrew Gibson <andrewsharyn at yahoo.com>
Subject: [Gmecm] TBI Swap - Iron Duke Tech IV
To: gmecm at diy-efi.org
Message-ID: <20060213210011.81525.qmail at web60814.mail.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"

The reason I reccomended what I did is because the 1227748 ecm spark
tables and base spark setting are for DIS. It was never used on a
distributor so the timing may be way wacked once est is commanded. I am
going to check it out but haven't done it yet. As for using a
distributor from a TBI it could work well. If it will fit the motor.
(There are about 4-5 different designs for the block) and doing so will
also require burning a very custom prom. Currently Tunercat is the only
one with 1227748 definition files for editing. And then you have to buy
proms, burner, etc. to get going.

  And the 250 HEI distributor? I have 2. Both do not have any external
connectors and the module location would require major modificaiton to
the distributor and cap. Potentially opening up for water intrusion.
Again I don't know how the 1227748 ecm will handle the spark tables on a
distributor. So I'm leaving the mechanical adavances for now.

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Message: 2
Date: Tue, 14 Feb 2006 09:50:09 -0600
From: Aphelion79 <aphelion79 at cox.net>
Subject: Re: [Gmecm] TBI Swap - Iron Duke Tech IV
To: gmecm at diy-efi.org
Message-ID: <43F1FC31.4040100 at cox.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

First of all, I took everything off of the donor engine... its the same
exact engine as I've got in my Jeep, but my Jeep is  carburated, and the
Olds is Fuel Injected... so The Dizzy I took off of the Olds, the Intake
Manifold/TBI, and all sensors will screw directly into my Jeep's
block/head... so Yes, I did in fact take the distributor from the Olds,
the only thing left out in the junkyard is the engine block/transmission
lol... The distributor is a giant heatsink with two coils mounted to it,
is all... and a shaft with an o-ring on it to plug the hole where the
mechanical dizzy went...  For VSS, I do not need it do I?... my speedo
is mechanical into my Transfer Case so I can just not use the VSS plug
and cap it off / pull the wires, right?  VSS shouldn't send any info to
the ECM that would deal with anything except shifting the transmission,
and your MPH on the Dash Display, correct? I am currently missing two
sensors, the Knock Sensor, and the Crankshaft Position Sensor.  From
what I can tell on the wiring diagrams any other sensors I either am not
using, or already have!

I'll be tearing into the wiring harness tomorrow (Wednesday) to rebundle
wires for my application/lable them and I will post any questions I have
then...

Thx for the help all!
-Matt