ECU EPROM QUESTION... will it work?

[Cheks_Talon_TSi]

I have a 1991 TSi FWD Manual trany and a friend of mine is parting out a 91 TSi FWD Automatic Transmission... his car has an EPROM ECU, will that ECU work on my car???

I believe the ECU has nothing to do with the transmission but I am not sure... can someone help me with this question...

By the way, does a 1G AWD ECU will work on a 1G FWD???

I will apreciate a lot your feedback

Sergio G.

 

[boostngst]

I know that the maps are actually different for the auto's versus the mani. Plus the auto ecu code pulls timing in between shifts.

As far as fwd vs awd, for the 2g's the only difference is 1 1k resister but I'm not 100% sure about the 1g's.

If anything get it and hold onto it until you get it socketed.

 

[huafist]

If you have the ECU socketed and a new chip burnt, it'll work fine. FWD or AWD is designated by a combination of R129 and R130 resistosrs, both of which are 1k.

These two resistors denote whether or not it's FWD or AWD, Federal or California.

The config for Federal AWD is R129 install, R130 not installed.

 

[Cheks_Talon_TSi]

If you have the ECU socketed and a new chip burnt, it'll work fine. FWD or AWD is designated by a combination of R129 and R130 resistosrs, both of which are 1k.

These two resistors denote whether or not it's FWD or AWD, Federal or California.

The config for Federal AWD is R129 install, R130 not installed.

I am getting confused...

My idea is to buy that EPROM ECU and get it socketed to use a Stage III Chip... but that's why I want to know if it will work on my FWD Manual trany... So, will it work??

Hope anyone can help me!

Thanks

Sergio G.

 

[1gp0wer]

Yes, it will work. The ecu itself has nothing to do with the transmission; that is controlled by the TCU (transmission control unit). The difference is, the injector sizes were different between manual and auto transmissions, so the maps are calculated for different sized injectors. I can't recall the sizes offhand, or find them readily, maybe someone can chime in with those. Bottom line though, if you're burning a new chip, you can have the maps flashed for your specific injectors, whether they're upgraded or stock from your MT car, and it will work.

IIRC, it's actually the TCU that drops timing between shifts, but that may be wrong.

 

[DSM BEEYACH]

Sup Guys,
I have i similar question i just did a FWD to AWD conversion on my 95 talon any way ever thing works just fine untill the car heats up to its normal operation temp. After the car heats up it dose not run as good as i know it should. Anyway i did not replace my ECU from FWD to AWD so iam thinking could that be it. The reason i ask is that a few years ago i work'd in a body shop and, one guy brought in an A4 AUDi on which he swapped out his manual tranny for an automatic tranns and his car would over heat becouse of it and, just would not run right untill he swap out the ECU. Also it does seems that my engine heats up more than it did on my 95 gsx. Before i could pop the hood after runing the car for a long time and pull the oil cap and it would just be warm as to now its to hot to touch. yet the engine temp on gauge is the same. Anyway iam just woundering if i should swap out my FWD ECU for an AWD ECU or can i just do something with the R129 and R130 resistors to make it work properly with my AWD. I just dont want to lose my EPROM ECU if i dont have to. Any input would be greatly appreciated.

 

[huafist]

Sup Guys,
I have i similar question i just did a FWD to AWD conversion on my 95 talon any way ever thing works just fine untill the car heats up to its normal operation temp. After the car heats up it dose not run as good as i know it should. Anyway i did not replace my ECU from FWD to AWD so iam thinking could that be it. The reason i ask is that a few years ago i work'd in a body shop and, one guy brought in an A4 AUDi on which he swapped out his manual tranny for an automatic tranns and his car would over heat becouse of it and, just would not run right untill he swap out the ECU. Also it does seems that my engine heats up more than it did on my 95 gsx. Before i could pop the hood after runing the car for a long time and pull the oil cap and it would just be warm as to now its to hot to touch. yet the engine temp on gauge is the same. Anyway iam just woundering if i should swap out my FWD ECU for an AWD ECU or can i just do something with the R129 and R130 resistors to make it work properly with my AWD. I just dont want to lose my EPROM ECU if i dont have to. Any input would be greatly appreciated.

Read my above post. R129 installed and R130 not installed is the proper configuration for a Federal AWD ECU.

 

[DSM BEEYACH]

Quote: Read my above post. R129 installed and R130 not installed is the proper configuration for a Federal AWD ECU.

Sounds good man thanks alot for your reply. Are you sure that every thing else is the same like the fuel maps.

 

[huafist]

Quote: Read my above post. R129 installed and R130 not installed is the proper configuration for a Federal AWD ECU.

Sounds good man thanks alot for your reply. Are you sure that every thing else is the same like the fuel maps.

Fuel maps are only different between A/T and M/T, if memory serves. But even if they're not - hell, you have an EPROM ECU. Just burn a new chip and be done with it

 

[talondude4]

all ready been down this road, yes it will work there is a separate thing called a tcu or some thing of that nature. this is what i read so don't quote me.
all i know is like 50 people like said it would work

 

[DSM BEEYACH]

Quote: Fuel maps are only different between A/T and M/T, if memory serves. But even if they're not - hell, you have an EPROM ECU. Just burn a new chip and be done with it

Yea your right about burning a new chip but since i have no way to do so at this time i guess i'll just will have to swap in a awd ECU. Do you know if a 97 gsx ECU would work on a 95 talon. Also i thought that those two resistors are just speed limiters or iam i wrong about that.

 

[DSM BEEYACH]

all ready been down this road, yes it will work there is a separate thing called a tcu or some thing of that nature. this is what i read so don't quote me.
all i know is like 50 people like said it would work

So is there some thing that i have to do with the tcu that you have mentioned.

 

[huafist]

Also i thought that those two resistors are just speed limiters or iam i wrong about that.

You're quite wrong, R129 and R130 are only there to designate Federal/California and FWD/AWD configurations. Using this method, Mitsu could build 1 ECU and use it for multiple car configs.

all ready been down this road, yes it will work there is a separate thing called a tcu or some thing of that nature. this is what i read so don't quote me.
all i know is like 50 people like said it would work

The TCU shouldn't make any difference between FWD and AWD - only between M/T and A/T. Same with the ECU.

I just noticed that you're a 2G. This information probably won't apply to the 2G ECU. I know very little about their configuration.

 

[Talesin]

Yes, you can use a 1G AWD or FWD manual ECU in either car... there are minor differences, but they're negligible. It won't screw up the car, in other words.

The 1G automatics, though.. since you have a socketed ECU, you can just change out the chip. The standard automatic fuel map is for the 380cc injectors that come in the 1G automatics... and will not work right with the 450cc injectors that come in the manual.

Just swap the EPROM with one holding fuel maps for your injectors, and the automatic ECU will work just fine in your manual.


Cheers!

 

[DSM BEEYACH]

Quote: you're quite wrong, R129 and R130 are only there to designate Federal/California and FWD/AWD configurations. Using this method, Mitsu could build 1 ECU and use it for multiple car configs.

Well thanks again for your reply but can you tell me what the difference is between the Federal/California configurations. And what is a TCU.

 

[DSM BEEYACH]

Yes, you can use a 1G AWD or FWD manual ECU in either car... there are minor differences, but they're negligible. It won't screw up the car, in other words.

The 1G automatics, though.. since you have a socketed ECU, you can just change out the chip. The standard automatic fuel map is for the 380cc injectors that come in the 1G automatics... and will not work right with the 450cc injectors that come in the manual.

Just swap the EPROM with one holding fuel maps for your injectors, and the automatic ECU will work just fine in your manual.

Sorry about this but you lost me on this one. I was never planing on using a 1G ECU i just wanted to keep my 2G EPROM ECU if it was possible to make it work properly with my AWD setup. I mean it does work as is but just not the way that it should. Also do you know if an ECU off a 97 GSX would work on a 95 tsi AWD.

 

[talondude4]

Quote: you're quite wrong, R129 and R130 are only there to designate Federal/California and FWD/AWD configurations. Using this method, Mitsu could build 1 ECU and use it for multiple car configs.

Well thanks again for your reply but can you tell me what the difference is between the Federal/California configurations. And what is a TCU.

tcu is....

transmission
control
unit

 

[DSM BEEYACH]

Quote: tcu is....

transmission
control
unit

Well thanks again for your reply with that info but, from what i understand is that only automatic trannys have those units. So that really does not apply to me since i got a manual tranny. Am i right or wrong on this one.

 

[Dream On]

You are correct. Manual cars do not have a TCU.

 

[talondude4]

what he said^^^^ you asked what it was so i just told you.

OK so let me get this straight, i can take an ecu out of a manual car and have it work.
so would that be differant with a manual? I'm just curios thats all?

 

[Cheks_Talon_TSi]

Thanks everyone for answering my original question

After reading all threads, I got this conclusions (Please let me know if I am wrong):
ABOUT 1G DSM ECU:
1.- 1990 ECUs are different from the 91-94 DSM turbo ECUs... So a 1990 ECU won't work on my 91 Tsi.

2.- If I use a 1G (91-94) ECU from an automatic on my car, it will work but ECUs of automatic cars are programmed for 350CC inyectors (stock inyectors on automatic DSMs). Since my car is Manual and got the stock 450CC inyectors, it will be running rich.

3.- If I got an EPROM ECU from a 1G automatic, I can get it socketed and burn a chip for my 450CC inyectors and it will work fine!!!

4.- TCU is the device which control the automatic trany, so only automatic cars got this TCU. ECUs doesn't have anything to do with the transmission.

5.- The ECU of 1G AWD is different from the ECU of the 1G FWD (R-129 & R130). Nevertheless, it will work no matter if it is an AWD or FWD. I mean, I can use an ECU from an AWD on my car (FWD) and it will work fine!!!

Am I right on every conclusion I got??? or am I wrong?

Thanks in advance

 

[talondude4]

i think your right on the button. I'm not sure about #1 though whats the difference..
only that one yr was differant from all the other 1g's?

 

[steve]

ABOUT 1G DSM ECU:
1.- 1990 ECUs are different from the 91-94 DSM turbo ECUs... So a 1990 ECU won't work on my 91 Tsi.

A '90 ECU will work in a '91-94 car by swapping pins 6 and 14 but not the other way without modifing the the ignition circuit in a '90 car to make the tach work correctly. The '90 ECU's software isn't quite as good as the later ECUs so using one should be the last option.

Steve

 

[Talesin]

Yes, you can use a 1G AWD or FWD manual ECU in either car... there are minor differences, but they're negligible. It won't screw up the car, in other words.

The 1G automatics, though.. since you have a socketed ECU, you can just change out the chip. The standard automatic fuel map is for the 380cc injectors that come in the 1G automatics... and will not work right with the 450cc injectors that come in the manual.

Just swap the EPROM with one holding fuel maps for your injectors, and the automatic ECU will work just fine in your manual.

Sorry about this but you lost me on this one. I was never planing on using a 1G ECU i just wanted to keep my 2G EPROM ECU if it was possible to make it work properly with my AWD setup. I mean it does work as is but just not the way that it should. Also do you know if an ECU off a 97 GSX would work on a 95 tsi AWD.

I was replying to the original poster... you know, up at the very top of the thread, who was asking if he could use a '91 1G FWD Auto ECU in his '91 1G FWD manual. And then asked if an AWD ECU will work in a FWD.

Thought that would be obvious. :b

 

[DSM BEEYACH]

What are my Option: Here the way i see it.

Option A: Try to modify my stock FWD EPROM ECU to work properly on my AWD setup.
Option B: Try to find a AWD EPROM or Non EPROM ECU that will work properly on my AWD.
Option C: Leave a note to my family gas up my car go find an empty garage close of all ventilation. Sit in my car at WOT and, wait for the sweet release of death.


Anyway if any body see's another way out please let me know. And on another note i pull'd my ECU apart and found that i have the R130 resistor installed but i cant find the R129 resistor any where could it be on the other side of the ECU. What would happen if i pull the R130 resistor out. please some one help cuzz option C: keeps looking better and, better to me.

DSM'S CANT LIVE WITH THEM CANT LIVE WITH OUT THEM.