Any DCT owners changed their final drive / diff ratio?

[Tomba]

Internal Flash
Memory configuration
Sector Address Size Type
01 0xA0000000 0x00004000 RW
02 0xA0004000 0x00004000 RW
03 0xA0008000 0x00004000 RW
04 0xA000C000 0x00004000 RW
05 0xA0010000 0x00004000 RW
06 0xA0014000 0x00004000 RW
07 0xA0018000 0x00004000 RW
08 0xA001C000 0x00004000 RW
09 0xA0020000 0x00020000 RW
10 0xA0040000 0x00040000 RW
11 0xA0080000 0x00080000 RW
12 0xA0100000 0x00078000 RW

can you try to rewrite any of first 8 sectors? if so, i can give you patched data with signature check bypass.

I don't have a car by hand currently. But can do this once I am working again.
I can change the final drive ratio and read out the memory again after flashing. I suspect they (magicmotorsport) bypass RSA themself. At least as far as I know they do this on Fxx DMEs as well. First flash takes 5-8 minutes. One after that mostly 2 or less minutes. I haven't flashed any DCT yet.

[olza]

xHP currently supports some DCT transmission and adds the possibility to change the final drive ratio.
Unfortunately I don't have an A2L file for the DCT transmission. I can read it with X17/Flex tool (MagicMotorsport). But don't know the location/value to edit.

In attachment DKG/DCT read from E9X M3.

Internal Flash
Memory configuration
Sector Address Size Type
01 0xA0000000 0x00004000 RW
02 0xA0004000 0x00004000 RW
03 0xA0008000 0x00004000 RW
04 0xA000C000 0x00004000 RW
05 0xA0010000 0x00004000 RW
06 0xA0014000 0x00004000 RW
07 0xA0018000 0x00004000 RW
08 0xA001C000 0x00004000 RW
09 0xA0020000 0x00020000 RW
10 0xA0040000 0x00040000 RW
11 0xA0080000 0x00080000 RW
12 0xA0100000 0x00078000 RW

can you try to rewrite any of first 8 sectors? if so, i can give you patched data with signature check bypass.

[olza]

this is GTS HW-NR 7844978 ZB-NR 7845773 - SW-NR 7845781

[Tomba]

OMG thank you for external eeprom dump and PFlash sectors 0-7 dumps!!! This is i need so much!!!

Final Drive Ratio is at 0x271FC (Sector 8) offset in your int_flash dump. Value is (4E 0C) = 0xC4E = 3150 (3.15x1000).

No problem. Glad I could be off assistance. Thanks for pointing out the final drive ratio, helps a lot!

Nice find.

Tomba, does the X17/Flex automatically correct checksums/rsa?

Yes, it does. As far as I know currently only MAPS are able to be changed.
You can also clone gearbox control units with the software

Was this a read from a GTS flashed DCT?

Or normal Euro or NA?

I'll have to check, I believe normal European one.
You can compare 0da files from SP daten and compare "regular" file vs "GTS" file. I still think without A2L file it will be hard.

[tdott]

xHP currently supports some DCT transmission and adds the possibility to change the final drive ratio.
Unfortunately I don't have an A2L file for the DCT transmission. I can read it with X17/Flex tool (MagicMotorsport). But don't know the location/value to edit.

In attachment DKG/DCT read from E9X M3.

Was this a read from a GTS flashed DCT?

Or normal Euro or NA?

[olza]

seems i hacked signature check today, thanks to this dump binarys!

[S54B32]

If someone knows how to correct checksum, we can maybe repack 0PA/0DA files to flash with Winkfp. I have access to a DCT swap (with different rear ratio) to test.

[Martyn]

Nice find.

Tomba, does the X17/Flex automatically correct checksums/rsa?

[olza]

xHP currently supports some DCT transmission and adds the possibility to change the final drive ratio.
Unfortunately I don't have an A2L file for the DCT transmission. I can read it with X17/Flex tool (MagicMotorsport). But don't know the location/value to edit.

In attachment DKG/DCT read from E9X M3.

OMG thank you for external eeprom dump and PFlash sectors 0-7 dumps!!! This is i need so much!!!

Final Drive Ratio is at 0x271FE (Sector 9) offset in your int_flash dump. Value is (4E 0C) = 0xC4E = 3150 (3.15x1000).

[Tomba]

xHP currently supports some DCT transmission and adds the possibility to change the final drive ratio.
Unfortunately I don't have an A2L file for the DCT transmission. I can read it with X17/Flex tool (MagicMotorsport). But don't know the location/value to edit.

In attachment DKG/DCT read from E9X M3.

[Peter De La Mare]

I went 3.62 a couple of years ago. The downshift blips disappeared as expected. TRS Performance in the UK tweaked the map to reflect the ratio change. Now back to normal.

[tdott]

I believe changes are in the DCT module also, GTS software on a regular M3 is a popular mod. One of the first guys that claimed to have been able to change the ratios says he starts with the GTS software and makes his changes.

[terra]

Yeah, i've seen similar too. I wonder why in the MSS60 both manual, SMG and DCT ratios are defined and in the MSS65 manual and SMG ratios are defined if they aren't used....

Could be for other functions like cruise control or shift lights. Though idk why the SMG ratios would be there.

[Martyn]

Yeah, i've seen similar too. I wonder why in the MSS60 manual, SMG and DCT ratios are defined and in the MSS65 manual and SMG ratios are defined if they aren't used....

[terra]

I believe I have located the final drive ratio in the MSS60 so I need someone with swapped gears to try it. I did have someone who had fitted a 3.62 in their E92 but he has other issues at the moment.

From what I'm seeing, there needs to be something edited within the transmission software itself (in fact 335 guys sometimes will flash M3 DCT software so that they can run the M3 ratio).