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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > DCT Transplant



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      06-07-2012, 06:41 PM   #1
benzy89
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DCT Transplant

So I'm not sure what made me think of this, but would it be possible to transplant a DCT transmission into an E90 335? Mechanically I really don't see any insurmountable obstacles & that the only real headaches would be minor fitment issues + the software.
  • The E90 M3 uses the DCT so fitment wise (drive shaft, mounting the transmission in a sedan, etc) it should be compatible
  • The 335is utilizes the DCT, so we know for a fact that the N54 engine + DCT get along fine (even on tuned N54s)

Aesthetics aside (modifying the interior for the new shift knob, buttons for the DCT settings, replacement steering wheel) this sounds very possible. I know that my reasoning is very basic, but I was wondering if anyone has more knowledge on the compatibility of the DCT into an E90 335 + what the potential obstacles are.
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      06-07-2012, 06:52 PM   #2
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Actually regular 335i was offered with DCT overseas. Unlike here, only in the IS.

If you really want to spend the cash, I am sure it can be done.
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      06-07-2012, 07:12 PM   #3
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So software & fitment aren't problems, its a "how much is this gonna cost me?" Anybody know the going rate for a DCT?
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      06-07-2012, 07:50 PM   #4
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New ones are almost 8 grand from Tischer. There was another thread about this not long ago. Not worth it imo.
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      06-07-2012, 08:25 PM   #5
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Yikessss --- Guess I should start looking for a totaled M3/335is with a DCT
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      06-07-2012, 08:30 PM   #6
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Just do a manual swap so you can get a single turbo
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      06-07-2012, 08:45 PM   #7
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Well that and upgraded clutch packs are about 4k, and the stock ones start slipping just north of 400 wtq.
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      06-07-2012, 09:20 PM   #8
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Originally Posted by Lulz_M3 View Post
Well that and upgraded clutch packs are about 4k, and the stock ones start slipping just north of 400 wtq.
The DCT?? Idk about that just because all the E9x M3s with the ESS S/C kit seem to be doing alrite. I mean if that's really an issue you can always upgrade your DCT:
http://www.sspperformance.com/sub-ca...ransmission--/
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      06-07-2012, 09:40 PM   #9
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The DCT?? Idk about that just because all the E9x M3s with the ESS S/C kit seem to be doing alrite. I mean if that's really an issue you can always upgrade your DCT:
http://www.sspperformance.com/sub-ca...ransmission--/
Even the 650 kit is only pushing 420 lbs of torque
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      06-07-2012, 09:52 PM   #10
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it would be probably cheaper and easier to just trade for a DCT car
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      06-07-2012, 10:13 PM   #11
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^^Not the point. Trying to see if a E90 335is is possible
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      06-08-2012, 12:17 AM   #12
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I prefer a true manual, but this would be interesting. Good luck if you decide to go through with this and post lots of pics/vids
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      06-08-2012, 07:41 AM   #13
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Quote:
Originally Posted by benzy89 View Post
The DCT?? Idk about that just because all the E9x M3s with the ESS S/C kit seem to be doing alrite. I mean if that's really an issue you can always upgrade your DCT:
http://www.sspperformance.com/sub-ca...ransmission--/
Uh yeah, the M3's make peanuts for torque. And by the time you add in labor for installing those clutch packs, plus the price of the upgrade to DCT im betting you will be easily over 10k. But hey, if you got the funds - go for it and show us all how it is done.
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      06-08-2012, 08:00 AM   #14
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Well the S65 V8 doesn't have TQ (less than a stock N54), the DCT in the 335is has illustrated that upping the power on the N54 platform won't turn the gears into mush. If I can find a used DCT (totalled/junked M3/135/335) then I'll start investigating more in-depth. I just like the benefits of the DCT -- Automatic when you want & shifts faster than a stick.
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      06-08-2012, 09:18 AM   #15
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Actually it has shown MANY signs of weakness on both the 335is and the N55 335i models. http://www.e90post.com/forums/showth...t=dct+slipping
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      06-08-2012, 09:24 AM   #16
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^^NO good, so its safe to assume that the DCT in the F10 M5/F12 M6 has been reinforced/upgraded in some way? The S63 has 500 ft/lbs of TQ stock, so I can't imagine that it's the exact same trans as in the M3s.
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      06-08-2012, 10:13 AM   #17
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dude, stock autos are faster than most manual drives, arent they 100ms shifts or something insane like that?

dct isnt gonna be that much faster, and imho, the only benefit ud get is that 7th gear.
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      06-08-2012, 10:33 AM   #18
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This is becoming more & more expensive and less & less beneficial as this goes on. An AT upgrade/rebuild is sounding a lot more reasonable and realitic.
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      06-08-2012, 12:52 PM   #19
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Quote:
Originally Posted by benzy89 View Post
This is becoming more & more expensive and less & less beneficial as this goes on. An AT upgrade/rebuild is sounding a lot more reasonable and realitic.
How is it more realistic or reasonable when there is not a single upgraded automatic that has handled more power over a proven period of time than a stock automatic and the only upgrade available is criticized by anyone with knowledge about upgrading this automatic transmission?
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      06-08-2012, 12:57 PM   #20
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Level 10 AT Upgrade

http://www.e90post.com/forums/showthread.php?t=582230
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      06-08-2012, 01:12 PM   #21
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Quote:
Originally Posted by benzy89 View Post
Yes, thats who I'm talking about. Not proven reliable. Not even proven to be an upgrade. Not dissing Level 10. But I doubt it holds anymore than the stock box. Let me see it hold 600wtq consistently and I'll believe it.
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