build thread for 2.8 carb to chevy tbi.

[Kadams87]

I thank kadams for all this cause i want this swap to look as clean as possible so least amount of wires under hood. Most splicing will be done incab needing the interior diagram. Im not burning no chip until i gain access to the tools to do it my self being im studying electrical engineering, and have one hell of an school supplied with almost everything.

moates.net is your friend on that one. I have the BURN 2 chip burner, a few chips and the socket adapter. Everything set me back 85 bucks if I remember. TurnerPro to do the bin editing, it's free.

 

[Lil-Pony]

ill keep it in mind i have to learn the code and other stuff before i will do it, as long as the engine runs i wont worry about it. i may keep the egr, i may not

cammeddrz how did you retain the egr, did you hook it up to the new ecm, or have it as a stand alone, or did you delete it?

 

[cammeddrz]

If you want to start burning chips, and what not. Before you waste time on that, Call speedometer solutions, and get a custom vss that will mount into your ford t-case, but send the gm signal.

That will make a bigger difference.

don't forget to use the gm knock sensor too.

For the record, the gm 2.8 is within 2% of the ford 2.8 on displacement, valve sizes, cam profiles etc..do modifying the tune is all but unnecessary

 

[Lil-Pony]

Im not going to modifiy today maybe later when i have 100$ layin around, but for sure.

 

[Lil-Pony]

finished the wiring harness, looked at the ecm and found a little white box screwed to the back.

 

[Kadams87]

finished the wiring harness, looked at the ecm and found a little white box screwed to the back.

Bad link on the picture

 

[Lil-Pony]

fixed hopefully

 

[Kadams87]

finished the wiring harness, looked at the ecm and found a little white box screwed to the back.

that is the DRAC, on chevy's the VSS goes into that and it converts the pulses to a signal that the cruise control, abs, speedometer, and ecm can use. It calibrates the signal for tire size and gear ratio basically.

 

[Lil-Pony]

so not needed since i can run a vss signal directly into the ecm on a later date.

 

[Kadams87]

so not needed since i can run a vss signal directly into the ecm on a later date.

No the VSS goes into that box on the Green/Black and Black wires that are right next to each other then I think it's the blue wire that goes to the ECM. The wiring diagram will show it. That box has to be between your ECM and the VSS

 

[Lil-Pony]

so this lets this the ecm understand the vss
i believe i dont have that diagram

 

[cammeddrz]

we didn't use the DRAC on ours, because we didn't use the VSS.

 

[Kadams87]

so this lets this the ecm understand the vss

Correct

we didn't use the DRAC on ours, because we didn't use the VSS.

He said for when he added a VSS later.

 

[cammeddrz]

not all tbi ecms came with a DRAC module, or an ETM (elapsed timer module) on models that had a drac, it needs the drac to use a vss. and on models that came with an etm, the etm needs to be present at all times for it to run

 

[Lil-Pony]

ok. thanks for the answer was really wondering if i should throw it away or keep it, ill mount it but not hook it up or anything.