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DCT slipping with lots of Torque? Nope!
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View Poll Results: Does your DCT slip and/or Have Problems with 400tq+ ? | |||
I have a DCT with 400tq+ and my clutch slips (I HAVE abused my transmission) | 17 | 18.09% | |
I have a DCT with 400tq+ and my clutch slips (I have NOT abused my transmission) | 18 | 19.15% | |
I have a DCT with 400tq+ and NO problems with my transmission (I HAVE abused my transmission) | 29 | 30.85% | |
I have a DCT with 400tq+ and NO problems with my transmission (I have NOT abused my transmission) | 30 | 31.91% | |
Voters: 94. You may not vote on this poll |
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09-16-2012, 03:14 PM | #1 |
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DCT slipping with lots of Torque? Nope!
[Short Story]
I dyno'd conservatively at 460tq and my DCT trans is handling the power like a beast. Clutches grab strong, no slipping. [Long Story] Hi guys. I kept hearing rumors about DCT's and their lack of ability to hold large amounts of torque, causing slip and the like. Well, I just wanted to share an experience from the other side. I can only really find one instance of DCT slippage from "having too much torque" l, but I was still nervous non-the-less as I piled on the mods, testing out my 7spd DCT. Just as a background and to familiarize everyone with my setup: I have a 2012 335is with the DCT transmission. I'm running BMS DCI, AR catless DP's, ETS FMIC, and a Cobb protune done by Jake@ProTuningFreaks. In my tank lies 6 gallons of e85 with 10 gallons of 93 octane. This is a new map I'm running, and it still in the process of being smoothed out, but I took the opportunity at ///Mpact East 2012 to have my car dyno'd on the very conservative Dyno Dynamics setup they had. Unfortunately, I don't have base numbers to compare with, as I went head first into mods as soon as I picked up the car, but my car read 460tq to the wheels at ///Mpact!! Needless to say, while doing logs and just driving my car hard for the past few days, I have had no problems with my transmission holding the power, WOT through a gear, or through shifts with sport mode on as well. I have been running 3 gallons of 85 to my 13 gallons 93 octane for a few weeks prior to this and that wasn't causing any issues either. So far, I have to say, the DCT is working like magic and I haven't seen any problems that I keep hearing people spreading because of one (maybe two) instances of dogged cars with DCT slippage. I'll update with my dyno graph in a bit. Again, this map is still a work in progress
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09-16-2012, 03:31 PM | #2 |
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Parts wear down over time, Im not surprised that its not slipping right away, most cars that had problems were because they were constantly tracked/raced. Let us know how everything holds up!
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09-16-2012, 03:46 PM | #3 |
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+1 it's only a matter of time.
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09-16-2012, 05:06 PM | #5 |
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Interested in the long term effects on the DCT.
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09-16-2012, 05:08 PM | #6 |
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Not even a new stock cluch slips on high torque. But however, I remember reading somewhere that the 335is DCT is stronger than the N55 135i DCT.
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09-16-2012, 05:10 PM | #7 | |
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sorry
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09-16-2012, 05:55 PM | #8 | |
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Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost. Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold) |
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09-16-2012, 07:56 PM | #9 | ||
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I stay away from brake launching and trying to WOT from a dig without using LC. There is another LC not mentioned in the Owners Manual which can be used for those special occasions at a red light Sport On S Mode (Not M or D Mode) {when you launch you can shift manual, dont let the DME shift for you} DTC Completely Off "Firmly" Hold Brake Down, Press gas peddle down pass the kick down, release the brake.....off you go with a hell of alot of wheel spin Use it only once within a period of time, multiple use you will start to experience clutch slippage, or the DME will not allow you. |
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09-16-2012, 11:51 PM | #10 | |||
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09-17-2012, 11:05 AM | #12 |
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with one hand i wish u luck that your tranny goes on forever. i know a few guys who very occasionally do WOT with fbo + meth +100 oct launches with zero trannh issues. even i do hard launches but thats very rare.
other problem area is the downshifter in kick down. that shocks the tranny + sudden torque load. try avoiding that from happening. with other hand i suggest you start saving pennies for an upgraded driveshaft( like DSS) plus a tranny rejuvination ( level 10 or whatever its called) looking around 6k installed + you may want to upgrade lsd sooner than later. thats another 2K the harder you push it, the harder the car will hit your wallet
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09-17-2012, 11:11 AM | #13 | ||
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Its seems you have been moderate at doing this though. Your throttle modulation helps with the strain on the clutches with that type of launching. |
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09-17-2012, 12:57 PM | #14 |
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lol this is an entertaining topic
"hey guys my 2012 DCT isn't slipping and i just recently installed all the parts and got pro-tuned" unfortunately, in 0-2 years, you'll need a rebuild. it's not if the clutch packs will slip or not, it's when. |
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09-17-2012, 01:42 PM | #15 | |
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I did five launches in my autocross runs and 4 of them were with the method I described. Within the number of launches and amount of time I had between though launches, I didn't have any slipping problems, but that's not to say it won't happen later. |
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09-17-2012, 01:58 PM | #16 | |
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Could you please enlighten me with some examples and facts, instead of just commenting to be a dick? Of all the searching I did, I had a hard time finding info of actual cars with problems with their DCT's slipping and not able to hold their power. All except for one example of a car thrashed with LC after LC after LC at the track. All I want to do is add actual examples to the discussion of DCT slipping instead of just he said she said, one example being mine. |
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09-17-2012, 02:46 PM | #17 |
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Interesting read about DCT abilities from a 700HP e92. Search Google for: M3 DCT Build Journal - World's First BMW DCT Build.
Posting links to other forums is apparently frowned upon. |
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09-17-2012, 03:42 PM | #18 |
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Very simple, clutch packs need replacement over time. More power/torque == earlier need of replacement.
I'm going to build a Procede/Meth/RB setup with my new '09 DCT. I have budgetted a new upgrade clutchpack for next year. This after my research for the ZF box and the harm tuning can do to a gearbox. I consider the ZF box as stronger then my new DCT box. But we will see.
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09-17-2012, 06:12 PM | #20 |
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I agree, had to do quite some research and measurements on my ZF AT to proof slippage.... between the engine, the box and the wheels... it's a slow but progressive process... day by day... at the end only physical inspection can provide evidence...
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09-17-2012, 06:32 PM | #21 |
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lol... Look, I understand the whole more power = more wear. All I'm saying is, people keep saying the same thing about DCT's, but where's the evidence???? It's like a game of telephone gone mad, but with everyone saying the same damn thing. I have only found evidence of clutch slip/wear on a DCT car that has been launch controlled 10+ times in a row at a track, creating extreme amounts of heat. Only two cases I could find in existence, and both transmissions were ABUSED. Why is it so hard to believe that the DCT can hold the power and last for more than a year or two max?
I don't want to defend one way or the other, or get offended when someone says XYZ. I just want to see some evidence. There are plenty of e9x M3's with superchargers and I still couldn't find DCT slippage problems. What you are telling me is that because 2 people, who admitted to ABUSING the crap out of their transmissions signifies that ALL DCT's can't handle 400+ tq and will slip or fail. Maybe a poll is in order... asking people with DCT's to come forward and get some actual numbers in order. |
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09-17-2012, 08:07 PM | #22 | |||
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Have I expereince slippage, yea sure, but the slippage was due to driver error and not understanding how the DCT and its safety mechanisms work |
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