I know that TBI ecms all run from a reprogramed chip that stores all the variable and whatnot in them to run the motor at various conditions.

And I'm pretty sure that the TPI ecm (or at least newer ecms) have the ability to learn and adjust the variables for better performance, not just go fast performance.

Has anyone tried to make or design a ecm device that would learn as you drive or as you add better parts like cams, heads, or exhaust. It seems to me that the weak part of the TBI system is the ecm because it can't do anything other than what is is programed to do. There are guys on this board who have done way more mods than me, most of which I was going to do myself but after I see there 1/4 mile times it makes me think again about these mods.

Could a mass air flow TPI computer system be adapted to work with our TBIs so we wouldn't have to do so much chip tuning?

 

TPI ECM's are nothing special. They don't have any kind of learning features that our computers do not. They all have block learns (BLM) to adjust the fueling if it's off, our TBI ecm's have that too.

Any speed density system in general will need tuning of the chip if things are changed. The fueling runs off of the expected volumetric efficiency of the engine. If you suddenly throw a cam in that totally shifts the VE of the car, the chip will obviously be off.

Could you take a carbed car and throw heads and a cam on it and expect the carb to adjust itself and give it more fuel? No.

 

I guess I don't know as much as I thought I did. I'm kinda lost when it comes to the computer aspect of these cars.

 

Bronyraur is misleading you
TPI computers are actually powered by pentium chips... Everybody knows that.

 

Thank you for the waste of bandwidth, and my time.

 

lighten up hoss it was a joke

and, cmon, bandwidth? lol you surfing the net via a TBI computer?

If time and bandwidth were concerns then maybe a reply wasn't the best course of action.

 

The 749 will also work in a tbi application. The firing stratagy is different but people have used them before. Not a direct plug it in and drive away, though.

 

I'm about as light hearted as it gets. but comments like that, are what drag good informative theads down. there was potential for a very good discusion/thread here. then you comment entered.

and when you pay for bandwidth for a high data transrering server, you would understand.

 

i was talking to a guy in texas awhile back who sells 383 crate engines for tbi trucks. he said the tbi truck ecms are much better than ours as their baud rate is al lot faster and they have close to ten times as many pages of code. he said he's swapped tbi truck ecms into third gens a number of times successfully. i looked for the link to his page, but haven't been able to find it yet.

 

Maybe the late model trucks if they have PCM's or something. But the TBI trucks in the same era as our cars run the 7747 ecm. It's basically identical to our computers except IIRC it doesn't have an IAC maybe. The baud rate is the same slow one though. Only the P4 TPI computers have the fast baud rate.

 

he was talking about the late model tbi truck ecm

 

what is the model number for late model truck ecm(1994-1995 model year)? i believe it is now understood those trucks run at a much higher fuel pressure that earlier models. anyway that is what GM mechanic told me. not sure if a correlation just an observation.

 

So basically there is really no way around the chip burning.

I was having some thoughts about making a connector that would plug into the chip connection and have the ecm run from a laptop with some really good software to learn the variables to make the ecm help the motor perform better without all the guess and check. Its just a thought but its the only thing I can come up with to make things a little better/easier for us TBI guys.

 

They already make devices that eliminate teh prom to allow real time tuning and other features. Still have to do the work yourself, though. Theres no way around that. To my knowledge, the later PCMs are meant for use with an electronically controlled automatic transmission. They can be flashed but I hear its kinda slow given the datarate.

 

va454ss succesfully swapped over to a '7060. I'm not sure if it is a pcm or ecm, but other than re-pinning the harness and a slight issue with the vss (which obviously got fixed), it worked out well for him. It's been discussed before.

I think it would be a feasable option for us as well, though I'm not too knowledgable on the chip tuning aspects. I know va454 uses the autoprom. I'm leaning towards the prominator right now, though if I'm gonna swap ecm's, I'd better deside fast I guess.

 

I'll be going prominator soon and was wondering about swapping ecm's then too. I was thinking about swapping for the faster baud rate. Now i thought the only other computer we could put in was the 747 which apparently doesnt have a faster rate, so what else can go in and is it worth it?

-chuck

 

With the new romless board, and RBob's super 60 code coming out soon. our computer will be the one to have

 

I havent been reading diyprom board much lately, and such have no clue what that means....but that sounds sweet!

-chuck

 

https://www.thirdgen.org/techbb2/sho...hreadid=244675

enjoy the read!