My take: ///M-DCT vs PDK vs GTR DCT vs AMG Speedshift 7 Speed MCT

captainaudio · 10-14-2011, 07:37 PM

Quote:

Originally Posted by -=Hot|Ice=-

Thanks! Yes they should. It would make a world of a difference.

Actually it would not make a world or difference, it would make a slight difference. I recently drove a Jag XKR-S on the road and on a track. The ZF auto in that car may not shift as fast as a DCT but it shifts pretty damn fast and is incredibly smooth. For what I would use the car for if Jag went to a DCT it would mean nothing to me.

CA

-=Hot|Ice=- · 10-14-2011, 08:09 PM

Quote:

Originally Posted by captainaudio

Actually it would not make a world or difference, it would make a slight difference. I recently drove a Jag XKR-S on the road and on a track. The ZF auto in that car may not shift as fast as a DCT but it shifts pretty damn fast and is incredibly smooth. For what I would use the car for if Jag went to a DCT it would mean nothing to me.

CA

I guess it comes down to personal preference. I think it would really help add to the driving experience.

Nine · 10-14-2011, 08:33 PM

Getrag makes a great DCT, they are used in cars like the 458 italia and SLS AMG.

09E92M34ME · 10-14-2011, 08:33 PM

i have a 09 DCT and it went from good to great with the software update. unbelieveable!

ES_TRADER · 10-14-2011, 08:44 PM

My one and only gripe about dct is sometimes I have no clue what gear I'm in. Like approaching a quick right turn u slow down, ur watching the road and for pedestrians but also have to look down to see if dct downshifted for u to the proper gear or are u still in 6th. And have to change yourself

-=Hot|Ice=- · 10-15-2011, 01:35 AM

Quote:

Originally Posted by richpuer

My one and only gripe about dct is sometimes I have no clue what gear I'm in. Like approaching a quick right turn u slow down, ur watching the road and for pedestrians but also have to look down to see if dct downshifted for u to the proper gear or are u still in 6th. And have to change yourself

I believe your gear is shown in the middle of the gauge cluster. A heads up display would of been nice. We should see an M heads up display like the current gen M5 in the next M3.

saeyedoc · 10-15-2011, 08:43 AM

In normal mode, PDK will upshift for max fuel economy, but it's completely different in sport or sport mode. OP, did the P-car you drove have sport chrono?

-=Hot|Ice=- · 10-15-2011, 10:32 AM

Quote:

Originally Posted by saeyedoc

In normal mode, PDK will upshift for max fuel economy, but it's completely different in sport or sport mode. OP, did the P-car you drove have sport chrono?

I didn't see the timer so I don't think the car was equipped with Sport Chrono Plus.

Quote:

Originally Posted by shift@red

I've driven most and still think pdk is the best (sport mode/chrono)...along with the ferrari dual clutch.

Your assessment of pdk sounds like you didn't have the setting right or didn't have sport chrono at all in the car.
It's funny that it took BMW 4 years of tweaking to get it right or close to right whereas most of the others have been nearly perfect from the day of their launch.
They are all relatively close overall, but it's little things that you prefer in one over the other. It comes down to personal preference.

After all...Porsche created this technology over 20 years ago so you can thank them for inventing it (along with many other things like synchro mesh).

Very close. Honestly, I think the tables would of turned if the Sport Chrono Pack was equipped.

gthal · 10-15-2011, 01:47 PM

The downshift "clunk" you noticed on the MCT tranny... was that all of the time or just sometimes. I ask because my experience with the MCT is that it downshifted and rev matched well. Not as fast as the DCT on up or downshifts (the DCT is just crazy fast and seamless) but quite capable. I didn't spend enough time with the MCT to really find if the downshift was a problem.

-=Hot|Ice=- · 10-15-2011, 01:49 PM

Quote:

Originally Posted by gthal

The downshift "clunk" you noticed on the MCT tranny... was that all of the time or just sometimes. I ask because my experience with the MCT is that it downshifted and rev matched well. Not as fast as the DCT on up or downshifts (the DCT is just crazy fast and seamless) but quite capable. I didn't spend enough time with the MCT to really find if the downshift was a problem.

I would say it most of the time. The car can double de-clutch but it didn't feel that way.

gthal · 10-15-2011, 01:54 PM

Quote:

Originally Posted by -=Hot|Ice=-

I would say it most of the time. The car can double de-clutch but it didn't feel that way.

Very interesting... I didn't notice this issue but it will bug me if it is a problem.

rjd598 · 10-15-2011, 01:59 PM

the dct finds any means possible to get to seventh too if your in granny mode so its not just pdk. i always thought pdk was the godfather of transmissions

-=Hot|Ice=- · 10-15-2011, 02:00 PM

Quote:

Originally Posted by rjd598

the dct finds any means possible to get to seventh too if your in granny mode so its not just pdk. i always thought pdk was the godfather of transmissions

I didn't have the Sport Chrono pack. This may of played a roll.

BigHat · 10-16-2011, 03:54 PM

It was interesting to see Lexus go SMG in the LFA as it offered more "feel and involvement" than DCT options.

I do like DCT and also had an SMG-II car before this one. I do sometimes wish there was a bit more of a "kick in the butt" with DCT than there is currently but all-in-all it's a fine transmission.

karussell · 10-17-2011, 03:30 AM

great write up. I have driven all of these except the MB and would agree with you on your ranking. my pet peeve with PDK is the dumb shift buttons that it comes with standard. they are absolutely worthless. In typical Porsche fashion, they make you pay extra for something that should be standard like actual shift paddles. I still prefer manual cars for track toys, but the DCT is great for daily use and fun on the track as well.

M3V8Driver · 10-17-2011, 11:52 AM

Quote:

Originally Posted by Nine

Getrag makes a great DCT, they are used in cars like the 458 italia and SLS AMG.

Not sure by your post if this is what you were insinuating, but the BMW DCT was developed (mostly) by Getrag.

I also like how the DCT shift paddles move with the steering wheel, unlike the GT-R's and some others.

///Matthew · 10-17-2011, 12:47 PM

Quote:

Originally Posted by hgtran21

nothing beats the s2000 shifter imo

I miss mine.

infamousdru · 10-20-2011, 02:14 PM

Quote:

Originally Posted by M3V8Driver

Not sure by your post if this is what you were insinuating, but the BMW DCT was developed (mostly) by Getrag.

I also like how the DCT shift paddles move with the steering wheel, unlike the GT-R's and some others.

with paddles mounted onto the stearing column..its usually easier for tracking..that is the reason for the design...a turn at a high speed with the paddle on an odd side of the steering wheel can cause some difficulty..if its mounted to the coulumn its always in one place...i have a gtr and its so much easier mounted on the column then on my dct cars.....however it IS all about preference ;-)

HotIce · 08-14-2012, 12:49 AM

Quote:

Originally Posted by mkoesel

Nice write up Hot-Ice.

Mercedes should can the planetary MCT box and just put the DCT from the SLS in all the AMG cars.

Unfortunately, the DCT in the SLS has a very tiny lag on up-shifts as well.

E90Spacegrey · 08-14-2012, 01:08 AM

OP do you know if DCT on m cars has changed at all or just the software updates makes the transmission so much smoother than other car makers?

Terraforce1 · 08-14-2012, 01:12 AM

Great write up and comparison of the different boxes. I have to say I love my DCT, never ceases to amaze me at how good it really is

10-14-2011, 08:33 PM	#25
Nine Banned 49 Rep 1,922 Posts Drives: Not ZCP, FML. Join Date: May 2010 Location: DC, Miami, NYC iTrader: (2)	Getrag makes a great DCT, they are used in cars like the 458 italia and SLS AMG.
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10-14-2011, 08:33 PM	#26
09E92M34ME Captain 70 Rep 920 Posts Drives: 2009 E92 M3 Join Date: Jul 2008 Location: VIRGINIA iTrader: (0)	i have a 09 DCT and it went from good to great with the software update. unbelieveable! __________________ 09 E92 M3,AW/FR. MODS:Performane Kidney Grills,Side Gills,Exhaust Tips,BMW Performance Pedals,359 Satin Black GTS Wheels,275/35/19R & 255/35/19F PSS's,Dinan Stage I Suspension,Macht Schnell Spacers 12mmF,5mmR,Rear Fogs,Euphoria 6k,LCI Tails,LUX v3,OEM IND Painted Alpine White CF Performance Spoiler, Front Splitters, and Front Reflectors,Gloss Black Hood Vents,M Performance Steering Wheel.
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10-14-2011, 08:44 PM	#27
ES_TRADER Colonel 344 Rep 2,928 Posts Drives: 328i, 335i, M3, 535i, X5, 36M Join Date: Oct 2010 Location: OC iTrader: (3) Garage List 2014 Ford Raptor [0.00] 2012 328i E92 [10.00] 2013 X5 [0.00] 2013 335i F30 [8.00] 1990 Toyota Previa [0.00] 1997 E36 M3 [10.00] 2011 E92 M3 [0.00] 2011 535i [0.00]	My one and only gripe about dct is sometimes I have no clue what gear I'm in. Like approaching a quick right turn u slow down, ur watching the road and for pedestrians but also have to look down to see if dct downshifted for u to the proper gear or are u still in 6th. And have to change yourself
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10-15-2011, 08:43 AM	#29
saeyedoc Captain 284 Rep 835 Posts Drives: 2013 Carrera S, 2013 Panny GTS Join Date: Jun 2010 Location: San Antonio, TX iTrader: (0)	In normal mode, PDK will upshift for max fuel economy, but it's completely different in sport or sport mode. OP, did the P-car you drove have sport chrono?
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10-15-2011, 01:47 PM	#31
gthal Major General 1901 Rep 5,678 Posts Drives: 2018 340i xDrive Join Date: Jul 2007 Location: Canada iTrader: (2)	The downshift "clunk" you noticed on the MCT tranny... was that all of the time or just sometimes. I ask because my experience with the MCT is that it downshifted and rev matched well. Not as fast as the DCT on up or downshifts (the DCT is just crazy fast and seamless) but quite capable. I didn't spend enough time with the MCT to really find if the downshift was a problem. __________________ 2020 X3 M40i \| Black \| Current DD 2020 C8 Corvette \| Z51 \| Torch Red ... built and waiting for delivery 2016 M2 \| Long Beach Blue \| 6MT 2015 M4 \| Austin Yellow \| DCT 2012 MB C63AMG \| 2011 E92 M3 \| 2010 E92 M3
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10-15-2011, 01:59 PM	#34
rjd598 Banned 1770 Rep 6,696 Posts Drives: F30 340i Join Date: Jan 2009 Location: San Diego,CA iTrader: (2) Garage List 2016 BMW 340i [0.00]	the dct finds any means possible to get to seventh too if your in granny mode so its not just pdk. i always thought pdk was the godfather of transmissions
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10-16-2011, 03:54 PM	#36
BigHat Lieutenant 7 Rep 513 Posts Drives: '11 M3 E93 Join Date: Jan 2010 Location: NoVa iTrader: (0)	It was interesting to see Lexus go SMG in the LFA as it offered more "feel and involvement" than DCT options. I do like DCT and also had an SMG-II car before this one. I do sometimes wish there was a bit more of a "kick in the butt" with DCT than there is currently but all-in-all it's a fine transmission.
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10-17-2011, 03:30 AM	#37
karussell Lieutenant Colonel 353 Rep 1,749 Posts Drives: 4 wheels Join Date: Sep 2009 Location: NorCal iTrader: (1)	great write up. I have driven all of these except the MB and would agree with you on your ranking. my pet peeve with PDK is the dumb shift buttons that it comes with standard. they are absolutely worthless. In typical Porsche fashion, they make you pay extra for something that should be standard like actual shift paddles. I still prefer manual cars for track toys, but the DCT is great for daily use and fun on the track as well. __________________ "It gave you amazing satisfaction, but anyone who says he loved it is either a liar or he wasn't going fast enough." - Jackie Stewart on racing at the Nurburgring
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08-14-2012, 01:08 AM	#42
E90Spacegrey Enlisted Member 2 Rep 42 Posts Drives: 2009 E90 Space Grey Join Date: Jul 2012 Location: Bay Area iTrader: (0)	OP do you know if DCT on m cars has changed at all or just the software updates makes the transmission so much smoother than other car makers?
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08-14-2012, 01:12 AM	#43
Terraforce1 If you ain't first, you're last! 7 Rep 580 Posts Drives: '14 Boxster GTS + 14' 1199 S Join Date: Feb 2011 Location: Europe iTrader: (0)	Great write up and comparison of the different boxes. I have to say I love my DCT, never ceases to amaze me at how good it really is
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