4L80e controller

Silverback

BoostRetard
Has anyone had any luck adapting any of the factory GM stuff to run one? Searching through the old threads it looks like JS was tinkering with it but I don’t know that I’ve ever seen it go past the guinea pig stage.

If so which box are you using? This turbocharged small block that has inspired all these 4L80 questions is currently running a strange conglomeration of GM stuff (‘165 harness repined, ‘730 ecm, everything wired like a ‘749 with a $58 mask out of a sy/ty and, I’ve been experimenting with the $60 stuff from the GM ECM world), so it’s not like a “roll your own” or a semi roll your own solution is going to scare me away, I’d probably actually prefer it.

If I can’t find an answer that I like there I’m probably going to go with the TCI box, since I can’t figure out what makes the others worth 2x or more as much. I know that the Jet setup is just the gm setup with a custom chip, the GM setup is now actually the TCI box with a GMPP sticker on it, and the huges box is just the 3rd controller box (can’t remember who makes it right now) with their name stuck on it.
 

mattw

Active member
Re: 4L80e controller

What turbo charged small block are you referring to?


This ECM was used in diesel apps and its just a tranny controller:

$D3 16128420 92 - 93 C/K Diesel Truck L65, Auto Trans, TCM


I am pretty sure that Jeff has piggy-backed this one to a 749 for tranny control:

$31 16197427 or 16156930 95 C/K Truck, Van, 5.7L & 7.4L (HD)




-Matt
 

JSM

Active member
Re: 4L80e controller

Yes I did get and have the stock gm ecm mostly refined for tranny control.

It is not easy, and takes several hours of wiring and knowledge of ecm's.

I will offer all that information free of charge to any customer, but with the disclaimer I am not responsible and can not provide technical support for it.
 

Silverback

BoostRetard
Re: 4L80e controller

mattw said:
What turbo charged small block are you referring to?

Well, it started as an L98 small block in an ’87 formula… what it ends up as… well, vastly different… but still a 350ci SBC and for the time being it still even has a long runner intake.

I've been lurking here a long time since I get asked a lot of sy/ty stuff and because a turbocharged TPI engine is very similar to the turbocharged 4.3, in power band... the biggest difference is that you guys misplaced 2 cylinders...

This ECM was used in diesel apps and its just a tranny controller:

$D3 16128420 92 - 93 C/K Diesel Truck L65, Auto Trans, TCM

Yea, that’s what I assumed people were using, but after a little poking around it looks like a mid 90’s big block ECM would be the easiest since it is already all setup for the sensors that you have on a gas engine, just piggy back it and don’t let it control anything but the tranny

JS Manufacturing said:
Yes I did get and have the stock gm ecm mostly refined for tranny control.

It is not easy, and takes several hours of wiring and knowledge of ecm's.

I will offer all that information free of charge to any customer, but with the disclaimer I am not responsible and can not provide technical support for it.

At this point it doesn’t look to be all that difficult, assuming what you’re doing is basically what I stated above… just piggy back the inputs from the harness that’s there and only use the tranny and TCC outputs on the ECM and don’t worry about the SES that you would get if it was connected… maybe mount a separate LED and test terminal somewhere for quick diagnostics, hell since you’re not using it to control the engine maybe even hack it to do datalogging for the engine sensors and a wide band…

What ECM did you actually use in yours? Is it as controllable as something like the TCU? Can you think of some way to do the paddle shifting deal with it?

I’m almost wondering if between time and actual money spent on parts if I wouldn’t be ahead just getting the TCU and going out to the garage and welding on something else instead… (though it did only take me 45min to do all the repining that I mentioned in the first post, and I have much better GM terminal tools now…). OTOH, I really like the fact that the TCU can run 2 different programs with a switch (say a “street” and “performance” program) and has provisions for upshift/downshift switches…
 
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