Yet another Auto to DCT swap

[Brett Shepard]

Thanks to everyone's previous efforts, I just completed the DCT with M3 GTS flash swap on my 2010 auto 335i. I'm using the MFactory lightweight flywheel, M3 diff and axles with carbon fiber driveshaft. Everything was pretty straight forward. I did have some issues with another install of ncsexpert that I thought I removed. Ncexpert and NCS Dummy were looking at two different work folders. I had to swap pin 8 of x6031 to pin 10 on the trans harness for it to correctly communicate P/N position.
I only swapped the DCT, GWS, center console with drivelogic switch so far. Coded Kombi, DSC, JBBF and CAS. I have all 6 modes of drivelogic in manual mode. I have some tuning issues to work out before I can run it hard but shifts great through all gears at mid and part throttle. I looked up the SZL and I believe the one currently in the car will allow adjustable launch control. I'll verify in the next few days. Again, thanks for the efforts of everyone involved in this project! Feels like a new car!!

 

[aus335iguy]

Well done, you’re one of very few people who’ve completed this succesfully
You didn’t use the m3 DSC, Kombi or SZL. That’s interesting.

 

[dyezak]

:thumbsup:

 

[L€X]

Hello!

Thanks to everyone's previous efforts, I just completed the DCT with M3 GTS flash swap on my 2010 auto 335i. I'm using the MFactory lightweight flywheel, M3 diff and axles with carbon fiber driveshaft. Everything was pretty straight forward. I did have some issues with another install of ncsexpert that I thought I removed. Ncexpert and NCS Dummy were looking at two different work folders. I had to swap pin 8 of x6031 to pin 10 on the trans harness for it to correctly communicate P/N position.
I only swapped the DCT, GWS, center console with drivelogic switch so far. Coded Kombi, DSC, JBBF and CAS. I have all 6 modes of drivelogic in manual mode. I have some tuning issues to work out before I can run it hard but shifts great through all gears at mid and part throttle. I looked up the SZL and I believe the one currently in the car will allow adjustable launch control. I'll verify in the next few days. Again, thanks for the efforts of everyone involved in this project! Feels like a new car!!

Hello! I swaped m3 gts gws, szl, dsc and m3 gts soft. But launch control and shift lights don't work yet. Do you know some one Who did that successfully?

 

[Traf]

You used the M3 mecatronic to be able to use the M3 diff ratio ?

 

[L€X]

You used the M3 mecatronic to be able to use the M3 diff ratio ?

No, i use stock diff 335i dct 2,56 ratio and flash m3 gts trans. Also i use m3 gws, dashboard, dsc and szl

 

[aus335iguy]

Great to see that other people are doing the swap. I’d like to help you but dont know where to start.
@Brett Shepard How did you get on ?
@L€X I dont think anyone has the shift lights working. Launch control should work though

 

[L€X]

Great to see that other people are doing the swap. I’d like to help you but dont know where to start.
@Brett Shepard How did you get on ?
@L€X I dont think anyone has the shift lights working. Launch control should work though

Ok, thanks, i Will try something else. Now i have mdm Mode lol, but its doesn't work as it should

 

[Stokes]

No, i use stock diff 335i dct 2,56 ratio and flash m3 gts trans. Also i use m3 gws, dashboard, dsc and szl

Unfortunately, the 2.56 ratio diff will cause super soft, laggy shifts at higher speeds when running the M3/GTS DCT setup. Ends up that a 2.81 is a happy medium between 335is/135i DCT programming and M3 DCT programming.

 

[Brett Shepard]

I've had very little time to do more than drive the car a couple times. I haven't tried launch control yet. My understanding is that you won't be able to get the shift lights to work. I should get back to working on the car in the next couple weeks.

 

[L€X]

Unfortunately, the 2.56 ratio diff will cause super soft, laggy shifts at higher speeds when running the M3/GTS DCT setup. Ends up that a 2.81 is a happy medium between 335is/135i DCT programming and M3 DCT programming.

Are you sure? I didn't Drive fast yet, but looks like 2,56 diff is Ok... What type of diff do you have?

 

[Stokes]

Are you sure? I didn't Drive fast yet, but looks like 2,56 diff is Ok... What type of diff do you have?

I thought the same until after 4th year at full throttle. I tried resetting transmission adaptations and all kinds of other things. In the thread on the conversion, it was discovered (not by me) that the ratio was outside parameters. I tried a used 3.08 diff and wow, hard shifts from 4th gear and up. Someone else verified the 2.81 would work, then I bought a 240i bmw lsd (2.81) and swapped my cover with it. The 3.08 was to high on the revs for me.

 

[aus335iguy]

And just like that the price of 240i diffs doubled....

 

[Stokes]

The BMW Motorsport LSD didn't sell well as a dealer install. I think originally it was a $4k option. Mine was $2.2k when I picked it up (no core required). Ends up the pumpkin is the same, just the rear mount is different but resolved with using your original cover.

It's basically an old school clutch type (25%) in the same wierd casing that they use for non-M cars. I'm wondering if I can add a third clutch disc like on previous gen diffs and even machine the cap and get 4 disc's in there?

Not as strong as the M diff or the 100% variable lock up either. I wasn't ready to go full M.

 

[DirtKurt]

Stop messing around and drop in a camaro ss diff

 

[Seb335i]

The 335d Dif is 2.81 as it's very common here in France may 2.81 335d Dif be a good solution ?

 

[L€X]

The 335d Dif is 2.81 as it's very common here in France may 2.81 335d Dif be a good solution ?

I swapped 335d diff on my 335i dct, it's bolt on, cheap and it works. But there is no lsd on this diff (((

 

[Seb335i]

I swapped 335d diff on my 335i dct, it's bolt on, cheap and it works. But there is no lsd on this diff (((

Yes I well know that's it's an open diff but if it works with M3 GWS and flash it's a good start for me. I've already a 335d diff

 

[L€X]

Yes I well that's it's an open diff but if it works with M3 GWS and flash it's a good start for me. I've already a 335d diff

Yes, 335d diff will works nice with m3 gts flash and gws. Very fast shift

 

[E92-Ghandi]

I swapped 335d diff on my 335i dct, it's bolt on, cheap and it works. But there is no lsd on this diff (((

Does it have a welded ring or bolted?