Audi A4 MSA12 - Turbo pressure limiter question

[Thomas777]

Hello everyone!

I'm getting acquainted with the MSA12 ECU. This is in my '95er Audi A4 B5 with 1Z engine. I managed to discover most of the maps. I'm already over some modifications and test rounds. Looks like I'm stuck. I cannot raise the turbo pressure above 1990 mBar. I heard there is an SVBL value at address 06025, which I changed from 1990 to 2500. As far as I know, this engine controller has only one turbo map, its values have been changed to 2200 mBar max.
Has anyone experienced that there would be another turbo limiter map or maybe somewhere else in the SVBL? As far as I know the MAP sensor can measre up to 1,5 Bar.

Some information of my ECU:
Hardware part number:
- AUDI: 028 906 021-F ( 028906021F )
- BOSCH: 0 281 001 366/367 ( 0281001367 )
Software part number: 28SA2680

Engine code: 1Z (in Audi A4 B5 ’95er)

Thank you in advance for your help.

[rfernandes]

after turbo map you have a turbo pressure limiter map..you can find easy its a 10x10 map

[Thomas777]

Hi!

Thanks for the help!
As i know after the turbo map is the N75 map (with start address: 07CD8), which is 9x9 map. Is this the turbo limiter map then, not N75 map?
Can you give me the start address and the factor offsets for a turbo limiter map?
662024

[rfernandes]

post your file here

[Thomas777]

I've uploaded the files.

These include:
orig
ver6 - This works pretty well, except the turbo pressure doesn't go above 1990mBar
ver7 - Recent attempt to modify SVBL at 06025 so far unsuccessful