questions about DCT....

135iDCT · 04-09-2011, 04:19 PM

How much torque the DCT can handle?
is there any mods to make it handle more?
how long it take to change gears in ms? (the lexus ISF takes 200 ms)

is the DCT same in m3 and 135i....??

1on135_deal · 04-09-2011, 04:23 PM

well in the M3 u have a M-dct in my mind its like .3or.4 faster than 135 dct but you would never know if you didnt drive the M3. Torque wise I hear it can handle upwards of 400wtq

135iDCT · 04-09-2011, 04:34 PM

what do u mean .3 .4 faster??
if it's true 400 lb that's low

135iDCT · 04-09-2011, 04:36 PM

waiting for the expert people

1on135_deal · 04-09-2011, 04:43 PM

to the wheel and mili secs

Aries932 · 04-09-2011, 07:14 PM

From my understanding it is a different transmission. The reason why the transmission cannot handle past 360-400wtq is completely due to the clutch slipping from my understanding. There was a whole post about it that I cannot seem to find.

oman135 · 04-10-2011, 10:36 AM

in manual mode why does the dct change the gears automatically in red line

? it should not change until when i want to chenge the gear thats a proper double clutch trans !?
is it the same on the m3 ?

Walt White Coupe · 04-10-2011, 11:30 AM

in manual mode why does the dct change the gears automatically in red line ?

My understanding is that it doesn't change gears unless you hit the paddle.

oman135 · 04-10-2011, 11:34 AM

Quote:

Originally Posted by Walt White Coupe

in manual mode why does the dct change the gears automatically in red line ?

My understanding is that it doesn't change gears unless you hit the paddle.

no i tried it changes in red line

N55 Power · 04-10-2011, 12:36 PM

Quote:

Originally Posted by oman135

Quote:

Originally Posted by Walt White Coupe

in manual mode why does the dct change the gears automatically in red line ?

My understanding is that it doesn't change gears unless you hit the paddle.

no i tried it changes in red line

Buy a manual instead and redline it till your moter blows up.

oman135 · 04-10-2011, 12:41 PM

Quote:

Originally Posted by N55 Power

Buy a manual instead and redline it till your moter blows up.

didnt ask ur opinion about buying a manual !

most of the dcts doesnt change automatically !
when u are going sideways and it changes to 2nd its a big problem !

Aries932 · 04-10-2011, 01:04 PM

Quote:

Originally Posted by oman135

didnt ask ur opinion about buying a manual !

most of the dcts doesnt change automatically !
when u are going sideways and it changes to 2nd its a big problem !

I am pretty sure the 135i DCT will shift at redline automatically...also it will downshift automatically to stop the car from stalling. Otherwise it will not shift as long as you are in manual mode.

So I am not sure about your experience, but if you are going sideways and it shifts it is basically like backing off the throttle. The cars back end will just come straight or if you are not drifting you will just slow down. Not exactly the biggest problem, but it would most definitely jack up your lap times. However regular automatics work in the same way with regards to shifting.

Walt White Coupe · 04-10-2011, 01:17 PM

Yes it will down shift automatically if your foot is off the gas and slowing down. I haven't tried it but I suspect if it automatically up shifts at the red line it is more like the engine hits the rev limiter and then it shifts.

oman135 · 04-10-2011, 03:17 PM

Quote:

Originally Posted by Walt White Coupe

Yes it will down shift automatically if your foot is off the gas and slowing down. I haven't tried it but I suspect if it automatically up shifts at the red line it is more like the engine hits the rev limiter and then it shifts.

yes but i have driven an evo x with sst (dct) and in manual mode it doesnt shift automatically in redline unless u shift . exactly same as manual transmission . but in the 135i even in manual mode when it hits red line it shifts automatically which i dont like . then its better to keep it in S mode its the same it will shift when it hits the red line !

anyways someone told me that its not good to use manual mode all the time he says the transmission gets hot. is this true because 99% i use manual mode !

dicker · 04-10-2011, 03:21 PM

Quote:

Originally Posted by oman135

didnt ask ur opinion about buying a manual !

most of the dcts doesnt change automatically !
when u are going sideways and it changes to 2nd its a big problem !

If you're going sideways in first gear it's not really doing to do much. Now third gear to 4th could be an issue.

Aries932 · 04-10-2011, 10:15 PM

Quote:

Originally Posted by oman135

yes but i have driven an evo x with sst (dct) and in manual mode it doesnt shift automatically in redline unless u shift . exactly same as manual transmission . but in the 135i even in manual mode when it hits red line it shifts automatically which i dont like . then its better to keep it in S mode its the same it will shift when it hits the red line !

anyways someone told me that its not good to use manual mode all the time he says the transmission gets hot. is this true because 99% i use manual mode !

BMW would not have let you go to manual mode if it was not reliable. Everything about the BMW aside from launch control is designed to be reliable. So I really wouldn't worry about any overheating issues.

Also it is better to shift yourself according to what shiv said in his testing. He said if you let the car shift itself at redline you will see boost loss/throttle closure...but if you shift yourself you will see zero boost loss/throttle closure.

1on135_deal · 04-10-2011, 10:55 PM

Quote:

Originally Posted by oman135

in manual mode why does the dct change the gears automatically in red line

? it should not change until when i want to chenge the gear thats a proper double clutch trans !?
is it the same on the m3 ?

The m3 dct does the same thing if u ever push the paddle down all the way u can feel a click that click pretty much shifts you into next gear . Going side way lets see i havent had any issues i have 4,500 miles on my tires and i almost need new tires on the 135 so im going sideways alot you see. =)

135iDCT · 04-11-2011, 02:42 PM

I think no one can answer my questions

is there any way to contact bmw to give me the correct answers!!

1on135_deal · 04-11-2011, 03:58 PM

your questions make no sence your are talking about apples and oranges yes apples fall under the fruit catagory and oranges are orange. Like self explantory stuff here read a lil live a lil. jeez =)

135iDCT · 04-15-2011, 08:21 AM

thanx....that's the answer i was waiting for

Amalfitano · 04-15-2011, 10:30 AM

BMW only needed to make sure the DCT could handle the power levels they threw at it. They either didn't put a DCT on the 1m because of price or because they felt it couldn't reliably handle the extra power and overboost. I doubt M or bmw would tell you either way in an official manner. If you you did the ED like one of the 1addicts members, they could probably be a little more open about it in person since it wouldn't be official.

04-09-2011, 04:19 PM	#1
135iDCT Lieutenant 138 Rep 571 Posts Drives: 135I Join Date: Apr 2011 Location: wm iTrader: (0)	questions about DCT.... How much torque the DCT can handle? is there any mods to make it handle more? how long it take to change gears in ms? (the lexus ISF takes 200 ms) is the DCT same in m3 and 135i....??
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04-09-2011, 04:23 PM	#2
1on135_deal First Lieutenant 18 Rep 347 Posts Drives: 2011 135i Join Date: Dec 2010 Location: NY iTrader: (0)	well in the M3 u have a M-dct in my mind its like .3or.4 faster than 135 dct but you would never know if you didnt drive the M3. Torque wise I hear it can handle upwards of 400wtq __________________ "you blink I shift" DCT
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04-09-2011, 04:34 PM	#3
135iDCT Lieutenant 138 Rep 571 Posts Drives: 135I Join Date: Apr 2011 Location: wm iTrader: (0)	what do u mean .3 .4 faster?? if it's true 400 lb that's low
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04-09-2011, 04:36 PM	#4
135iDCT Lieutenant 138 Rep 571 Posts Drives: 135I Join Date: Apr 2011 Location: wm iTrader: (0)	waiting for the expert people
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04-09-2011, 04:43 PM	#5
1on135_deal First Lieutenant 18 Rep 347 Posts Drives: 2011 135i Join Date: Dec 2010 Location: NY iTrader: (0)	to the wheel and mili secs __________________ "you blink I shift" DCT
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04-09-2011, 07:14 PM	#6
Aries932 Captain 38 Rep 611 Posts Drives: AW 2011 135i DCT Join Date: Feb 2007 Location: Woodland Hills, CA iTrader: (3)	From my understanding it is a different transmission. The reason why the transmission cannot handle past 360-400wtq is completely due to the clutch slipping from my understanding. There was a whole post about it that I cannot seem to find. __________________ 2011 AW 135i - DCT - M Package - BMW Performance Suspension Kit - Berk Street Midpipes - Evolution Racewerks FMIC - JB4 - BMS Intake - BMS Downpipes
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04-10-2011, 10:36 AM	#7
oman135 Major 69 Rep 1,041 Posts Drives: F80 M3 Join Date: Aug 2010 Location: Oman-Muscat iTrader: (0)	in manual mode why does the dct change the gears automatically in red line ? it should not change until when i want to chenge the gear thats a proper double clutch trans !? is it the same on the m3 ? __________________ 2016 YMB F80 M3 Last edited by oman135; 04-10-2011 at 11:07 AM..
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04-10-2011, 11:30 AM	#8
Walt White Coupe Captain 225 Rep 741 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	in manual mode why does the dct change the gears automatically in red line ? My understanding is that it doesn't change gears unless you hit the paddle.
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04-10-2011, 01:17 PM	#13
Walt White Coupe Captain 225 Rep 741 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	Yes it will down shift automatically if your foot is off the gas and slowing down. I haven't tried it but I suspect if it automatically up shifts at the red line it is more like the engine hits the rev limiter and then it shifts.
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04-11-2011, 02:42 PM	#18
135iDCT Lieutenant 138 Rep 571 Posts Drives: 135I Join Date: Apr 2011 Location: wm iTrader: (0)	I think no one can answer my questions is there any way to contact bmw to give me the correct answers!!
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04-11-2011, 03:58 PM	#19
1on135_deal First Lieutenant 18 Rep 347 Posts Drives: 2011 135i Join Date: Dec 2010 Location: NY iTrader: (0)	your questions make no sence your are talking about apples and oranges yes apples fall under the fruit catagory and oranges are orange. Like self explantory stuff here read a lil live a lil. jeez =) __________________ "you blink I shift" DCT Last edited by 1on135_deal; 04-11-2011 at 03:59 PM.. Reason: gfg
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04-15-2011, 08:21 AM	#20
135iDCT Lieutenant 138 Rep 571 Posts Drives: 135I Join Date: Apr 2011 Location: wm iTrader: (0)	thanx....that's the answer i was waiting for
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04-15-2011, 10:30 AM	#21
Amalfitano Second Lieutenant 15 Rep 269 Posts Drives: 2009 135i STEP, Future //M2012 Join Date: Jan 2010 Location: Chicago iTrader: (1) Garage List 2009 135i [0.00]	BMW only needed to make sure the DCT could handle the power levels they threw at it. They either didn't put a DCT on the 1m because of price or because they felt it couldn't reliably handle the extra power and overboost. I doubt M or bmw would tell you either way in an official manner. If you you did the ED like one of the 1addicts members, they could probably be a little more open about it in person since it wouldn't be official.
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