[rjahl]

Originally Posted by ivanchen1211

Yes, if I run stock 7623588 with only power class byte change, there's zero error. After your file showed 2DE3, I then tried flash ECE version 7581355 with only power class byte change, seems no error as well so far For those who wanna try, I had coding error and could not default code it with NCSExpert(shows error when you perform sg_something), but after changing the vo from BU33(US3.0i) to DU53(ECE 3.0si) I can code it with no problem.

That's wild, The E85 is a really strange creature. Canbus confusion for sure. So the 2006 model year had a different Kombi or is the software older? If you try running any of the TCU tunes that activate the gear display, you could run into the same problem as some of the older E60s did.

[ivanchen1211]

Originally Posted by rjahl

That's wild, The E85 is a really strange creature. Canbus confusion for sure. So the 2006 model year had a different Kombi or is the software older? If you try running any of the TCU tunes that activate the gear display, you could run into the same problem as some of the older E60s did.

I've checked cluster input in WDS, it is identical before 2006/09 and after except washer fluid sensor. So should be a software issue. Can I ask you which ZB number version was your tune based on?

[rjahl]

Originally Posted by ivanchen1211

I've checked cluster input in WDS, it is identical before 2006/09 and after except washer fluid sensor. So should be a software issue. Can I ask you which ZB number version was your tune based on?

Attached is a table I did a really long time ago. Without double checking should be 7623585

Probably S6723586. 0da

[rjahl]

Originally Posted by ivanchen1211

I've checked cluster input in WDS, it is identical before 2006/09 and after except washer fluid sensor. So should be a software issue. Can I ask you which ZB number version was your tune based on?

If I had to guess there is a difference in the CAN settings in this section of the calibration file.

[ivanchen1211]

After comparing the 7623588 and 7623586 bin file, there are only 4 addresses bytes that are different. 0x486C, 0x4888, 0x4913, 0x4B1A. I wonder if I modify the 4 addresses value of your file to 7623588 value will fix the issue and gain the benefit of your extra tuning, since your file was based on 7623586.

However I have no idea what those functions are....worth trying?

[rjahl]

Originally Posted by ivanchen1211

After comparing the 7623588 and 7623586 bin file, there are only 4 addresses bytes that are different. 0x486C, 0x4888, 0x4913, 0x4B1A. I wonder if I modify the 4 addresses value of your file to 7623588 value will fix the issue and gain the benefit of your extra tuning, since your file was based on 7623586.

However I have no idea what those functions are....worth trying?

I took a quick look but these being one byte parameters they are difficult to trace however these all appear to be CAN message related.

[ivanchen1211]

Originally Posted by rjahl

I took a quick look but these being one byte parameters they are difficult to trace however these all appear to be CAN message related.

I managed to find xdf file from hassmachine and able to see what these bytes are for.

I compared the values in each bin, 3 of them seems related to INSTR 7 which meets the 2DE3 error code kombi-7.

486C seems related to the 2DE1 and 2DE2 fuel level sensor error

[ivanchen1211]

Well, it is very interesting since in previous post hassmachine indicate that the difference is c_abc_inc_tout_icl_3 and c_abc_max_tout_icl_3 but those values are identical in 7623588 and 7623586

[dt99]

Hi all,

This is a really useful thread with loads of useful info!

I'm hoping someone can point me in the right direction to help with a 3 stage manifold upgrade on my UK spec n52 2.5i. The 3 stage manifold is fitted and my goal is to get the car to the same power as a 2.5si, as the key difference is the 3 stage manifold (based on my research).

I've tried what I can do with bimmer labs and have flashed the rsa delete and trying to run the 2.5si tune (7581342). I get the 2FA4 error which puts the car into limp mode.

I've tried running the stock tune instead of the rsa delete which runs into the same problem.

Car runs fine with the stock 2.5i tune with or without the rsa delete.

As I understand it its to do with the power class which in some cases you can edit using NCS expert by matching the CAS powerclass to the 6BMOT, but I don't seem to be able to access the CAS with the E85 chassis in NCS expert to be able to do this (but by the sounds of it that is locked out after 10 hours anyway).

I think this issue is solved in the custom 330 3 stage manifold tunes as the power class byte is changed and it looks like a map exists for the 3.0i to 3.0si upgrade, but I haven't managed to find anything that works for the 2.5i to the 2.5si 3 stage upgrade.

Would anyone be able to point me in the right direction as to how to solve this?

And I have turned to chatgpt to see if it can work out where the power class byte might be between the 2.5si.bin file and the 2.5i bin file but had no luck!

[dt99]

Oh, also, I'm taking the car to the nurburgring in a couple of weeks.

[ptpending]

Originally Posted by dt99

Hi all,

This is a really useful thread with loads of useful info!

I'm hoping someone can point me in the right direction to help with a 3 stage manifold upgrade on my UK spec n52 2.5i. The 3 stage manifold is fitted and my goal is to get the car to the same power as a 2.5si, as the key difference is the 3 stage manifold (based on my research).

I've tried what I can do with bimmer labs and have flashed the rsa delete and trying to run the 2.5si tune (7581342). I get the 2FA4 error which puts the car into limp mode.

I've tried running the stock tune instead of the rsa delete which runs into the same problem.

Car runs fine with the stock 2.5i tune with or without the rsa delete.

As I understand it its to do with the power class which in some cases you can edit using NCS expert by matching the CAS powerclass to the 6BMOT, but I don't seem to be able to access the CAS with the E85 chassis in NCS expert to be able to do this (but by the sounds of it that is locked out after 10 hours anyway).

I think this issue is solved in the custom 330 3 stage manifold tunes as the power class byte is changed and it looks like a map exists for the 3.0i to 3.0si upgrade, but I haven't managed to find anything that works for the 2.5i to the 2.5si 3 stage upgrade.

Would anyone be able to point me in the right direction as to how to solve this?

And I have turned to chatgpt to see if it can work out where the power class byte might be between the 2.5si.bin file and the 2.5i bin file but had no luck!

the european N52 2.5 have real 2.5 engine displacement, while US 325 and European 125i have 3.0 displacement
the EU 325i with N53 engine have 3.0 displacement

[firesnatch]

Originally Posted by dt99

Hi all,

I've tried what I can do with bimmer labs and have flashed the rsa delete and trying to run the 2.5si tune (7581342). I get the 2FA4 error which puts the car into limp mode.

Did you see this post? here

[dt99]

Originally Posted by ptpending

the european N52 2.5 have real 2.5 engine displacement, while US 325 and European 125i have 3.0 displacement
the EU 325i with N53 engine have 3.0 displacement

Yes, but there is an European spec n52 2.5 displacement found in the Z4 2.5 si that has the stage manifold as I understand it making around 218bhp?

I have the non 3 stage manifold in the z4 2.5i making about 177bhp.

[dt99]

Originally Posted by firesnatch

Did you see this post? https://www.e90post.com/forums/showpost.php?p=25402696&postcount=1

For some reason that link isn't working for me...

[firesnatch]

Originally Posted by dt99

For some reason that link isn't working for me...

Sorry, i fixed the link in my original post. Or just copy and paste it.

[dt99]

Originally Posted by firesnatch

Sorry, i fixed the link in my original post. Or just copy and paste it.

Thanks! Yes I've seen that, but for whatever reason I'm unable to get to the CAS ECU through NCS expert for the E85 chassis (if I select the E89 chassis it gives me the option to select the CAS ECU) so I assume that isn't possible on the E85 chassis or or doesn't have one?!
Although I could be missing something as not really used NCS expert much.

So I get these options when selecting the E85 chassis:


Whereas on the E89 chassis for example you can select the CAS ecu:

[firesnatch]

Unfortunately I do not know. ChatGPT says that 2002-2004 models may not have a CAS at all. You could look for it under the dash above your pedals. I believe there would be a white box there labeled "CAS". If you don't have a CAS module, I'm not sure of the solution.

[firesnatch]

I asked ChatGPT and it said to try the following. I take no responsibility if this is wrong or destroys your car

🔧 Step-by-Step: Update Power Class Without CAS
- Launch NCS Expert
Use the "Expertmode" profile.
- Read the FA (Vehicle Order)
Select chassis: E85
Select ECU: choose AKMB
Press F2 (FA/VO) → then F1 (Enter VIN) → enter your VIN
Press F6 (Back)
- Change FA/VO Power Class
Press F4 (Process ECU) → select AKMB
Press F5 (Change ZCS/FA)
Add or update 6BMOT with the correct power class code (e.g., N46, M54, etc.)
Then press F6 (Back) to return.
- Write the Updated FA to Modules
Press F6 (Back) again
Press F5 (Change ZCS/FA) again if needed
Then choose AKMB, and then ALSZ to write the new FA to both modules.
NCS Expert should confirm the new FA has been written.

[dt99]

Originally Posted by firesnatch

I asked ChatGPT and it said to try the following. I take no responsibility if this is wrong or destroys your car

🔧 Step-by-Step: Update Power Class Without CAS
- Launch NCS Expert
Use the "Expertmode" profile.
- Read the FA (Vehicle Order)
Select chassis: E85
Select ECU: choose AKMB
Press F2 (FA/VO) → then F1 (Enter VIN) → enter your VIN
Press F6 (Back)
- Change FA/VO Power Class
Press F4 (Process ECU) → select AKMB
Press F5 (Change ZCS/FA)
Add or update 6BMOT with the correct power class code (e.g., N46, M54, etc.)
Then press F6 (Back) to return.
- Write the Updated FA to Modules
Press F6 (Back) again
Press F5 (Change ZCS/FA) again if needed
Then choose AKMB, and then ALSZ to write the new FA to both modules.
NCS Expert should confirm the new FA has been written.

That makes me nervous! I'm not sure I want to try that as the car is at least running with the 2.5i tune!

I am more comfortable modifying the .bin files for the 2.5i and 2.5si trying to change the relevant power class but I don't know which byte value to change. Does anybody know which byte is the power class byte on the E85 2.5i and 2.5si tune?

At this stage I'd happily pay someone to make me a tune file!

[ptpending]

https://www.e90post.com/forums/showp...96&postcount=1

Originally Posted by dt99

For some reason that link isn't working for me...

[ivanchen1211]

Originally Posted by dt99

That makes me nervous! I'm not sure I want to try that as the car is at least running with the 2.5i tune!

I am more comfortable modifying the .bin files for the 2.5i and 2.5si trying to change the relevant power class but I don't know which byte value to change. Does anybody know which byte is the power class byte on the E85 2.5i and 2.5si tune?

At this stage I'd happily pay someone to make me a tune file!

I have successfully flashed a E60 N52 523i (2.5L) to 525i (2.5L) by modifying the 525i stock file power class and runs without any problem

Same routine for Z4 2.5i to 2.5si I believe

If you want I can help.

[ivanchen1211]

Originally Posted by dt99

Hi all,

This is a really useful thread with loads of useful info!

I'm hoping someone can point me in the right direction to help with a 3 stage manifold upgrade on my UK spec n52 2.5i. The 3 stage manifold is fitted and my goal is to get the car to the same power as a 2.5si, as the key difference is the 3 stage manifold (based on my research).

I've tried what I can do with bimmer labs and have flashed the rsa delete and trying to run the 2.5si tune (7581342). I get the 2FA4 error which puts the car into limp mode.

I've tried running the stock tune instead of the rsa delete which runs into the same problem.

Car runs fine with the stock 2.5i tune with or without the rsa delete.

As I understand it its to do with the power class which in some cases you can edit using NCS expert by matching the CAS powerclass to the 6BMOT, but I don't seem to be able to access the CAS with the E85 chassis in NCS expert to be able to do this (but by the sounds of it that is locked out after 10 hours anyway).

I think this issue is solved in the custom 330 3 stage manifold tunes as the power class byte is changed and it looks like a map exists for the 3.0i to 3.0si upgrade, but I haven't managed to find anything that works for the 2.5i to the 2.5si 3 stage upgrade.

Would anyone be able to point me in the right direction as to how to solve this?

And I have turned to chatgpt to see if it can work out where the power class byte might be between the 2.5si.bin file and the 2.5i bin file but had no luck!

Try flash this
I used a 2.5si VIN and there are over 3 hundreds of stock tune
I used one of them and modified power class from 01 to 00
Can you share your VIN?
By the way E85 Z4 does not have a CAS, it uses the old EWS
Also, the ChatGPT above was just giving out useless nonsense info...

edit: I have updated the link with 7581341 file that stated 2.5si ECE with modified power class from 01 to 00

OK i have delete the file link as I stupidly edited 2190 instead of 2191...

Try pull off Disa valve cable after flash, if it is successful, DISA valve error will pop up.