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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 > 335is DCT



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      11-12-2012, 12:25 AM   #1
P-rex
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335is DCT

Anyone knowledgable or experienced with the DCT in the 335is. I'm noticing on a few occasions that when in situations in passing other cars ... The car revs high but doesn't change gears right away... I have ease off and then it up shifts... Is DCT slipping?
Also, at what mileage does the dual clutch need to be changed and what's it gonna run me ?

Thanks
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      11-12-2012, 02:25 AM   #2
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Umm....maybe I am misreading but wouldn't you want to be in the power range when you pass and press on the gas? Why would you want low rpm and high gear when you are building up power?
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      11-12-2012, 05:36 AM   #3
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Quote:
Originally Posted by tmaung
Umm....maybe I am misreading but wouldn't you want to be in the power range when you pass and press on the gas? Why would you want low rpm and high gear when you are building up power?
When the car is revving ... It's hitting around 6000 pr 6500 rpm's and not increasing speed.... Like as if its in neutral... It's not until I until I take my foot off the accelerator does the car then dro to lower rpm's and kick into gear... Similar to when your let off the clutch when driving MT.... It freaks me out.... Especially when passing on one lane roads on the opposite traffic lane when cars are approaching
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      11-12-2012, 11:22 AM   #4
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That seems very strange,

so what you are describing, is when you want to pass you mash the pedal but the car just revs likes it’s in natural so instead of accelerating the car is decelerating?

I think traction control (aka fun control) is kicking in and killing your power.
Repeat what you are doing but with the DCT off, report back.
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      11-12-2012, 11:27 AM   #5
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Quote:
Originally Posted by P-rex View Post
When the car is revving ... It's hitting around 6000 pr 6500 rpm's and not increasing speed.... Like as if its in neutral... It's not until I until I take my foot off the accelerator does the car then dro to lower rpm's and kick into gear... Similar to when your let off the clutch when driving MT.... It freaks me out.... Especially when passing on one lane roads on the opposite traffic lane when cars are approaching
Yeah if you push it and the DTC is on and the wheels start spinning then it feels like neutral. As suggested, I would turn off at least DTC and try again and maybe even with DSC off. It maybe your tires not gripping. If it isn't the tires spinning then I would take it to the dealer to get it checked out. As long as it isn't abuse, I think you'll be covered under warranty.
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      11-12-2012, 04:18 PM   #6
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Thanks guys...it feels like the gear isn't catching and traction related... Similar to when you shift from 3rd to 4th and leave your foot fully on the clutch for 5 secs before you release... I'll turn off the DTC and DSC and let you know if it makes any difference... Again it happens sporadically
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      11-12-2012, 04:21 PM   #7
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what year is your 335is? if it's early 11 model, there should be software update available for dct.
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      11-12-2012, 04:30 PM   #8
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You're gonna wanna PM "BuraQ" -- He's probably running one of the most aggressive setups on a DCT 335is. Any questions you'll have, he'll probably be able to answer or point you in the right direction.
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      11-12-2012, 06:05 PM   #9
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Thanks - my car is pure stock and I picked it up last July... The in service date was Jun 24/11... The worst part was that it's supposed to be CPO'ed.... And I took possession with the alignment shot... Possible golf tee mod which they fixed and now when I went to get the tires swapped in for winters... They told me the rears are toast... I only put on 4000km (2500 miles) so far... The car was previously a dealer salesmen in a one year lease.
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      11-12-2012, 06:46 PM   #10
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Take it to the dealer and ask about any software updates to see if that will solve the issue. Any mods on the car?

Anyways, BuraQ knows just about everything related to the 335is so im sure he will chime in
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      11-12-2012, 08:43 PM   #11
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Exact same issue

I posted this awhile back as I had two other Large passengers in the vehicle And from about 45 mph Floored it and the RPM shut up but the vehicle went basically no faster and I thought it was the clutch slipping. All the replies I got centered around the MechTronic controller was not applying the full clutch pressure and that it wasn't the clutch slipping. It's a late 2010 build 335is. I had only 14,000 miles on it when I experienced it. No mods so doubt it was the clutch. Plus others that are at FBO using the DCT transmission aren't having or reporting any issues even with higher output. Sorry for the bad grammar I'm entering this using Siri on iPhone
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      11-12-2012, 08:50 PM   #12
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Quote:
Originally Posted by P-rex View Post
Anyone knowledgable or experienced with the DCT in the 335is. I'm noticing on a few occasions that when in situations in passing other cars ... The car revs high but doesn't change gears right away... I have ease off and then it up shifts... Is DCT slipping?
Also, at what mileage does the dual clutch need to be changed and what's it gonna run me ?

Thanks
Couple of questions:

1) How fast were your going just before your decided to WOT in passing the other vehicle ?

2) Was your Sport button on ?

3) Was DTC on/medium/off?

4) Did you go pass your kick down on the gas peddle ie did your floor it ?

Thanks
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      11-12-2012, 09:10 PM   #13
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I was going around 70km (45mph) with sport button off...in D drive...full DTC on... The car dropped a gear or two... Wasn't looking but heard it... It just didn't kick into gear and I had to fall back out of fear... I didn't punch it fully... I would say 60% given then situation and the throttle I was expecting from the car...

I've driven stick all my life and DCT for 3 months .. So not sure if I did anything that would have caused this...

Also, given my rear tires are toast... I am assume the the dealership who demo'ed the car might have abused the LC
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      11-12-2012, 09:47 PM   #14
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Quote:
Originally Posted by P-rex View Post
The car was previously a dealer salesmen in a one year lease.
Signs of a heavily abused, unloved car
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      11-12-2012, 10:42 PM   #15
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Quote:
Originally Posted by P-rex View Post
I was going around 70km (45mph) with sport button off...in D drive...full DTC on... The car dropped a gear or two... Wasn't looking but heard it... It just didn't kick into gear and I had to fall back out of fear... I didn't punch it fully... I would say 60% given then situation and the throttle I was expecting from the car...

I've driven stick all my life and DCT for 3 months .. So not sure if I did anything that would have caused this...

Also, given my rear tires are toast... I am assume the the dealership who demo'ed the car might have abused the LC
Your DCT had disengaged the gear, misnomered as a slippage, until it reached a safe operating range in the power band. D mode and Sport off then an instant aggressive drive is a no no for this car

Whenever you are going to get aggressive in your driving turn the Sport button ON and S mode -(if your not acquainted with M mode)
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      11-12-2012, 10:58 PM   #16
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Quote:
Originally Posted by BuraQ
Quote:
Originally Posted by P-rex View Post
I was going around 70km (45mph) with sport button off...in D drive...full DTC on... The car dropped a gear or two... Wasn't looking but heard it... It just didn't kick into gear and I had to fall back out of fear... I didn't punch it fully... I would say 60% given then situation and the throttle I was expecting from the car...

I've driven stick all my life and DCT for 3 months .. So not sure if I did anything that would have caused this...

Also, given my rear tires are toast... I am assume the the dealership who demo'ed the car might have abused the LC
Your DCT had disengaged the gear, misnomered as a slippage, until it reached a safe operating range in the power band. D mode and Sport off then an instant aggressive drive is a no no for this car

Whenever you are going to get aggressive in your driving turn the Sport button ON and S mode -(if your not acquainted with M mode)
Thanks - I'll give a try
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      11-12-2012, 11:27 PM   #17
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Quote:
Originally Posted by BuraQ View Post
Your DCT had disengaged the gear, misnomered as a slippage, until it reached a safe operating range in the power band. D mode and Sport off then an instant aggressive drive is a no no for this car

Whenever you are going to get aggressive in your driving turn the Sport button ON and S mode -(if your not acquainted with M mode)
+1 have had this happen to me when I first bought my Is. I thought it was related to my car being tuned and FBO but, I have learned this also happens bone stock as well. Like Bura Q said, when you want to get aggressive put the gearbox in sport mode and use the manual shift to put the car in the proper gear for passing power. This way you will never get slippage. There is a small learning curve when driving DCT.
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      11-13-2012, 12:53 PM   #18
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Thank you all for the reassurance.... I was getting worried that I might be facing a failing tranny in the near future ....

Thanks again
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      11-13-2012, 06:46 PM   #19
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How do we know if the DCT software update was done (by prev owner) and if not should we get it done. My is is a 10-10 build. One of the first
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      11-13-2012, 06:51 PM   #20
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Quote:
Originally Posted by M3coupe
How do we know if the DCT software update was done (by prev owner) and if not should we get it done. My is is a 10-10 build. One of the first
you would have to ask your SA. My update was done in February 2012. my car was manufactured in March 2011
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      11-13-2012, 07:23 PM   #21
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Do you by chance remember what the update was designed to fix?
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      11-13-2012, 07:36 PM   #22
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Do you by chance remember what the update was designed to fix?
Nothin specific no, but RENNtech would not flash their tune on my car unless I got that update so there must have been something of importance

Previous to the update when I shifted their was a lot of kick in the engagment of each gear. After the update the gear to power transition was alot more smoother with less kick and roughness

Car will feel slower at first because the adaptive driving will be reset after module update
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