|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Search | Today's Posts | Mark Forums Read |
|
BMW 3-Series (E90 E92) Forum
>
DCT
|
|
03-14-2012, 02:28 PM | #1 |
Second Lieutenant
28
Rep 252
Posts |
DCT
In reasonably simplistic terms could anyone explain the difference/benefits of DCT over the normal Auto box.
Anyone with experience of the DCT box care to share their experiences of driving with it? Thanks
__________________
NOW SOLD - Counting down to the M3 - E92 May 07' 335i M-Sport - Sapphire Black - Manual - Black Leather Interior - Heated Seats - Bluetooth Handsfree - BMW Performance Black Grill - 19's - Saying No to the Diesel Revolution!
|
03-14-2012, 03:48 PM | #4 |
Captain
45
Rep 787
Posts |
DCT is like having two gearboxes - one has the odd gears and the other has the even. When it changes gear, it effectively disengages the clutch on one and engages it on the other at the same time, so the shifts are practically instant. Normal autos have to disengage one gear then engage the next, so they shift slower.
Advantages are better fuel economy (as it's not slipping the clutch except when pulling away) and better performance. The only real disadvantages are that some are badly behaved when manuevering (though I haven't heard any complaints about the box that BMW use) and they're even more complicated than a conventional automatic.
__________________
2019 VW Golf GTI Performance | H&R rear ARB
Previously 2007 E92 335i SE auto | Quaife LSD | Birds B3 ARBs | Evolve Stage 1 |
Appreciate
0
|
03-14-2012, 04:04 PM | #5 |
Brigadier General
190
Rep 4,655
Posts |
The technical side seems to be covered so all I can add is the way it feels vs the standard BMW auto.
It's quicker, it's similarly smooth and it's actually got a decent sport mode. Having 7 gears is also a good conversation piece down the pub! I'm expecting a big bill if it breaks... Matt |
Appreciate
0
|
03-14-2012, 04:05 PM | #6 |
First Lieutenant
39
Rep 394
Posts |
I really wish I could afford a DCT 335i it sounds like a mint bit of kit. I don't really even want to drive one coz I know it'll piss me off knowing I'll have to 'make do' with the step tronic. I only hope that the step box is as good as I hope it will be. I'm not expecting miracles but just smooth, fairly fast changes.
How much do decent spec DCT 335i's go for now? Must still be over 20k. |
Appreciate
0
|
03-14-2012, 04:08 PM | #7 | |
First Lieutenant
39
Rep 394
Posts |
Quote:
|
|
Appreciate
0
|
03-14-2012, 04:12 PM | #8 |
Second Lieutenant
28
Rep 252
Posts |
Sounds like an amazing bit of kit.
Quite glad they seem to go for so much though as would of been out of my price bracket.
__________________
NOW SOLD - Counting down to the M3 - E92 May 07' 335i M-Sport - Sapphire Black - Manual - Black Leather Interior - Heated Seats - Bluetooth Handsfree - BMW Performance Black Grill - 19's - Saying No to the Diesel Revolution!
|
Appreciate
0
|
03-14-2012, 06:11 PM | #9 |
Brigadier General
190
Rep 4,655
Posts |
Sorry for the shameless plug, but it sounds to me like you guys should check out my new car thread here...
http://www.e90post.com/forums/showthread.php?t=653416 I've recently bought a mint, DCT, twin turbo 335i with the HDD based Nav and in a great colour combo for around 24k. I'll be doing a lot of write ups including about the DCT box so check it out. Matt |
Appreciate
0
|
03-14-2012, 06:50 PM | #11 |
Brigadier General
230
Rep 3,899
Posts |
DCT was never an option on E90 generation 335i saloon either - was only available on the coupe so it looks like BMW may stick to the same formula when the F32 is available.
|
Appreciate
0
|
03-14-2012, 09:36 PM | #12 |
Brigadier General
220
Rep 3,016
Posts |
Basic operation and schematic here:
http://auto.howstuffworks.com/dual-c...ansmission.htm |
Appreciate
0
|
03-15-2012, 03:02 AM | #13 |
Lieutenant
12
Rep 444
Posts |
I've missed the boat on this one. Anyone know when they started fitting them?
Did they just go in the 335i and M3, or is there the opertunity to buy a used, say 330d with DCT? I'm guessing since they aint in the E90, they won't be in the E91 either??
__________________
E46 M3 SMG titanium silver, with grey leather. 335d now longgg gone.
|
Appreciate
0
|
03-15-2012, 03:04 AM | #14 |
-
288
Rep 2,596
Posts |
|
Appreciate
0
|
03-15-2012, 03:12 AM | #15 |
Lieutenant General
1867
Rep 13,043
Posts
Drives: BMW M340I G20
Join Date: Aug 2007
Location: UK
|
Around mid to late 2008. 335i and M3 at the time
|
Appreciate
0
|
03-15-2012, 03:38 AM | #16 |
Lieutenant
63
Rep 438
Posts |
I had a DSG box in my last car and it was brilliant. If they did a dct in the engine I went fori would have gone for it for sure. I test drove a normal auto in the 2.0d and it was ok although not nearly as good as a twin clutch. Saying that though the manual box is pretty crap so if I had the choice again I'd have gone for the auto. Sure the dct would be superb though
__________________
YMB M4
E93 320d Msport - sadly gone to the salvage yard. |
Appreciate
0
|
03-15-2012, 07:32 AM | #17 | |
Captain
18
Rep 617
Posts |
Quote:
|
|
Appreciate
0
|
03-15-2012, 09:35 AM | #18 | |
First Lieutenant
39
Rep 394
Posts |
Quote:
Can anyone tell me how the step tronic compares to the smg box in the old m3? I understand the mechanics around it but in practice how does the step feel against the smg when driving quickly though the gears? Faster, slower, smoother, jerkier? |
|
Appreciate
0
|
03-15-2012, 10:39 AM | #19 |
Brigadier General
190
Rep 4,655
Posts |
The SMG is more alike to the DCT than the standard Auto mate. It's far more aggressive, jerky and aggressive than the one you will drive, but also quicker.
BMW autos are VERY good, they are just not especially sporty. Expect smoothness but little excitement. Matt |
Appreciate
0
|
03-15-2012, 11:02 AM | #20 |
Lieutenant General
1867
Rep 13,043
Posts
Drives: BMW M340I G20
Join Date: Aug 2007
Location: UK
|
And clunky and nasty
|
Appreciate
0
|
03-15-2012, 11:15 AM | #21 |
Colonel
240
Rep 2,810
Posts
Drives: Jaguar XE P250 HSE
Join Date: Jan 2008
Location: Glasgow
|
The DCT came out on M3 and E92 (plus convertible versions) from March 2009.
|
Appreciate
0
|
03-15-2012, 09:25 PM | #22 |
First Lieutenant
83
Rep 387
Posts |
With reference to the OP question. DCT is amazing! Super quick shifts that aren't even noticeable. I actually don't think I could go back to anything else! Amazing gearbox!
|
Appreciate
0
|
Bookmarks |
Thread Tools | Search this Thread |
|
|