Possible to use a ECU from a diferent B6?

[caldy315]

All,

I have been planning on upgrading to a Stage 1+ tune after riding in a local persons B6 USP. I've recently aquired some TT225 injectors, so I'm shooting for a Stage 1+ tune. Before I start figuring out what company to go with, I was wondering if by chance I came across someone parting out their A4 that had a tune, would I be able to buy and use their tuned ECU with my car? I know the SKC and have programmed my own keys from scratch, so I've done some Vag Commander work.

If so, do I have to defeat the immobilizer? I would rather not, as that is what doesn't allow just any old key to start the car, at least from my reading. Ideally, I'd have both a stock set of injectors and ecu along with a tuned ECU and larger injectors.

Figured I would see what this was about before going to APR or another tuning company to get tuned.

[csosnowski]

You can pair the "new" ecu with the car.

You'll have to pull the skc out of the "new" ecu and have your existing skc to do it.

The procedure is outlined here under the heading "Engine Control Unit (ECU) Swapping (USED ECU)." Clicky.

To defeat the immo you would have to open the bin and change some hex and checksum the file, then flash it back to the ecu.

Honestly it would be easier to purchase an MPPS flashing cable from ebay and purchase a tune from a member here and flash it yourself. No immo voodoo to worry about.

[f1torrents]

any old key to start the car

Not quite, there is over 4000 combinations of Audi key blades out there.

[caldy315]

First off, not sure why this thread got duplicated. Tried to figure out how to close the other one but couldn't.
I think I got my answer in the other duplicate thread though, which was even if you do buy a different ECU that is previously tuned, if you try to pair to your car without defeating the immo, the tune will revert back to stock.

Not quite, there is over 4000 combinations of Audi key blades out there.

I meant, with defeating the immo, if you had the right key but it wasn't chipped right, the car would start and run. At least that's how I understand it. The immo tells the car that the key is legit.

You can pair the "new" ecu with the car.

You'll have to pull the skc out of the "new" ecu and have your existing skc to do it.

The procedure is outlined here under the heading "Engine Control Unit (ECU) Swapping (USED ECU)." Clicky.

To defeat the immo you would have to open the bin and change some hex and checksum the file, then flash it back to the ecu.

Honestly it would be easier to purchase an MPPS flashing cable from ebay and purchase a tune from a member here and flash it yourself. No immo voodoo to worry about.

I have no problem pulling the SKC. I did that to make my own key, I have the 4 digit SKC number. But I don't want to defeat the immo. What I want is two ecu's that are (or look to be) for my car's VIN, one stock, one tuned. But it sounds like that's a pipe dream as the tune will erase itself if the VIN doesn't match.

[Matt Devo]

buy a second stock ECU, pair it, then get it flashed

[blitz2190]

if you feel your up to the task you put your skc in the new ecu following this
http://nefariousmotorsports.com/foru...p?topic=2973.0

[blitz2190]

if you feel your up to the task you put your skc in the new ecu following this
http://nefariousmotorsports.com/foru...p?topic=2973.0

or better yet if your ecu is stock pull the 95040 immo bin from yours and flash to the new one

[Pothole]

I have a second ECU I have thrown in my car when I was trying to rule out a lean issue and wanted to rule out the APR tune.


I dont know what car it came out of but everything worked fine except my cruise control, figured maybe it was in an auto or didn't have cruise.

[caldy315]

buy a second stock ECU, pair it, then get it flashed

That actually makes sense. Best of both worlds, although the price is still the same, plus the cost of the ECU. Not bad though. If I have an 05, I should be able to use an 03-05 ECU and change everything to my car correct?

I have a second ECU I have thrown in my car when I was trying to rule out a lean issue and wanted to rule out the APR tune.


I dont know what car it came out of but everything worked fine except my cruise control, figured maybe it was in an auto or didn't have cruise.

Pothole, but was yours the tuned ECU or did you put in a different ECU that was tuned? If the latter, than sounds like what I wanted to do.

[csosnowski]

If an ecu is flashed with a tune putting it in another car and pairing it with the new immo information does not re-write the tables that are changed when the ecu is tuned.

[caldy315]

If an ecu is flashed with a tune putting it in another car and pairing it with the new immo information does not re-write the tables that are changed when the ecu is tuned.

I was just quoting what Matt Devo had mentioned I think in the other duplicate thread. He said:

depends on the tune - some/most will revert to a stock-like mode if the paired VIN changes, so having the SKC doesn't help, immo defeat is the only way. It would be easier just to get flashed with a tune that allows you to switch between stock/performance modes without having to change hardware

[csosnowski]

Hmm, I've never heard of that before. It seems odd since there are several ecu's for sale in the classifieds that still have their immo intact.

Either way, you could do it the easy way and find yourself an AK box ecu (2003+ iirc) and an MPPS cable from eBay. There are members on this board that write good tunes and they aren't $600.

[Pothole]

That actually makes sense. Best of both worlds, although the price is still the same, plus the cost of the ECU. Not bad though. If I have an 05, I should be able to use an 03-05 ECU and change everything to my car correct?



Pothole, but was yours the tuned ECU or did you put in a different ECU that was tuned? If the latter, than sounds like what I wanted to do.

My second one is OEM stock Audi tune on it. The one that came with my car has APR's tune on It now.

[Matt Devo]

Hmm, I've never heard of that before. It seems odd since there are several ecu's for sale in the classifieds that still have their immo intact.

APR and Revo both do it for sure. There's nothing to stop someone from selling a flashed ECU regardless, but the buyer needs to know the potential pitfalls of pairing the immo / learning a new VIN

[Pothole]

It is possible my "stock tune" ECU has had the imobolizer turned off, I got it from a friend of a friend.

It would make sense that it was set up like that as the first guy used it for diagnosing issues also.

[csosnowski]

APR and Revo both do it for sure. There's nothing to stop someone from selling a flashed ECU regardless, but the buyer needs to know the potential pitfalls of pairing the immo / learning a new VIN

Well that's good info, I was unaware of that previously. Its also retarded that they'd write the tune that way as well.

I remember when I had my b5s4 and I wanted to have APR do something with the tune, they said sure but you've got to pay us $150 to transfer the license to you before we can even touch the ecu. I declined and flashed a tune from somewhere else myself for next to nothing.

It seems silly to me.