Any DCT owners changed their final drive / diff ratio?

[Martyn]

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.

[tdott]

I have not done this, but it is a mod that guys do. and I might be interested if there was a solution to fix the issues.

DCT cars have a 3.154 Ratio, and manual cars have a 3.846 diff. Swapping a manual diff in a DCT car is a common mod, 4.10 motorsports gears are a common mod for manual cars.

There is an issue with the manual diff in the DCT car where downshifts are no longer smooth and the auto mode doesn't work as well.
AFAIK there is someone offering a software change to fix it, but only came to light recently and I believe they charge a lot to change the diff ratio software wise.

Dinan offered a 3.45 ratio to DCT cars back in the days, but never was able to reprogram the car to shift right.
I believe guys have also built a custom setup with 3.62 gear sets from an E39 m5 diff. As well as fitting the clutch type lsd from the m5 into the e9xm3 diff.

[Martyn]

As per the title, anyone done this? What ratio did you go for and are you finding your DCT behaves?