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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > DCT failure?



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      09-14-2012, 09:08 AM   #1
max1352012
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DCT failure?

Folks, I want to know if anyone is aware of any DCT failure due to JB4+FBO+Meth on a N55 ? I am currently FBO and want Meth but am afraid of the DCT. I heard some DCT slips or things like that, any experience shared is highly appreciate it, thanks guys! If it slips, what does it mean for the reliability of the trans ?
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      09-16-2012, 09:30 AM   #2
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So, nobody is aware of a DCT trans failure on a N55?????????? Thanks
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      09-16-2012, 12:28 PM   #3
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the clutch will start to slip after 420 torque or so.. Bu tjust don't go crazy on the launch control and you'll be fine
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      09-16-2012, 04:01 PM   #4
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Why not upgrade the DCT?
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      09-16-2012, 09:40 PM   #5
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I believe the M3 dct clutch pack upgrades could probably be used to beef up the transmission. Haven't heard of anyone doing it on an N54/55 car just yet.
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      09-17-2012, 08:47 AM   #6
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Quote:
Originally Posted by ParkNuts View Post
I believe the M3 dct clutch pack upgrades could probably be used to beef up the transmission. Haven't heard of anyone doing it on an N54/55 car just yet.
Forgive my ignorance, but why would the M3 DCT clutch pack be better than the one in the 135i? Even stock, our N55 engine makes more torque than the S65, never mind an N55 that is tuned, FBO + Meth.

I understand that the M3 would likely have beefier components overall but do you really think BMW would overbuild the M3's DCT to handle nearly double it's stock torque output? If anything, I would expect the M3's DCT to be designed to handle more revs but I don't see any reason for BMW to build it to handle that much additional torque.
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      09-17-2012, 09:47 AM   #7
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The two transmissions are actually the same (different part numbers due to different output shafts), with different software to control all the settings the M3 can set the transmission to. I was referring to the clutch pack upgrades the M3 guys get when they supercharge their cars.
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      09-17-2012, 01:54 PM   #8
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Quote:
Originally Posted by ParkNuts View Post
The two transmissions are actually the same (different part numbers due to different output shafts), with different software to control all the settings the M3 can set the transmission to. I was referring to the clutch pack upgrades the M3 guys get when they supercharge their cars.
Oh sorry, I didn't realize you were talking about the clutch pack upgrades, not necessarily the M3 clutch packs.

Yeah, I thought the DCT in these cars were the same with different software and of course the M3 gets the real LSD.
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