|
|
11-30-2010, 02:18 PM | #1 |
Captain of the Enterprise
101
Rep 1,424
Posts |
DCT driving me nuts
Ok. I know DCT is supposed to be the best thing since sliced bread, but I am having an issue with the timing of the automatic down-shifting.
I just got a new M3 after trading it in for a fantastic 335i. My 335i was an automatic to which I always utilized the sport shifter. The 335i never messed with the gears unless I came to a full stop. The M3 is a totally different story. In the M3, when coming in hard to make a 90-degree turn, I do all my braking on the straight-away like a good boy. As a I turn the wheel into the turn, the gear indicator on the dash is obstructed by the steering wheel, the DCT throws me into either 2nd or 3rd gear, and I have NO IDEA what gear I'm in when throttling out of the turn. This is particularly bad when I think I'm coming in from 4th gear and move to downshift only to find out that the DCT has already put me in 2nd and I inadvertently downshift into 1st! The result is a brutal demonstration of my seatbelt. Can one of you more experienced DCT guys, help me learn how to drive this thing? |
11-30-2010, 02:22 PM | #2 |
Captain
289
Rep 666
Posts |
You know... you wouldn't have these issues with a 6 speed *Joking*
I believe there was a list of people who had submitted a claim(s) to the appropriate party to address this. Have you contacted your dealer?
__________________
Technik 330 Past Projects:
'05 BMW 330Ci ZHP - Technik's ZHP *Sold* '07 Subaru STI - *Sold* '18 Subaru STi Type RA #350 '19 Honda Civic Type R #31191 |
Appreciate
0
|
11-30-2010, 02:24 PM | #3 |
octane chick
79
Rep 1,187
Posts
Drives: ex-M
Join Date: Oct 2010
Location: Colorado
|
One thing that has a huge impact on DCT is the 5-level sport setting for your manual mode and drive mode. I like full-on 5 for both.
I can't comment on racing technique. I'm still getting used to it, and now that the break-in period is behind me, it's getting to be (more) fun. |
Appreciate
0
|
11-30-2010, 02:35 PM | #4 |
Captain of the Enterprise
101
Rep 1,424
Posts |
Is this a problem or just a characteristic of the DCT?
The manual does describe the following: "It [DCT] offers you the following functions: > Either manual or automatic mode: sequential mode or drive mode > Automatic downshifting and protection against incorrect gear selection, even in sequential mode > Launch Control > Automatic throttle blip" I'm hoping that there may be a work-around with either one of the DriveLogic settings. |
Appreciate
0
|
11-30-2010, 02:38 PM | #5 |
Captain of the Enterprise
101
Rep 1,424
Posts |
Does the S5 setting keep things in gear longer? I don't mind downshifting. I just want a reliable way to know what gear I'm in.
|
Appreciate
0
|
11-30-2010, 02:44 PM | #7 | |
Captain
86
Rep 856
Posts |
Quote:
Read the manual before you use it
__________________
///M3 Mods: | Eisenmann Race Exhaust | Primary Cats Delete (TTP) | ESS Tune | 19" Advan RS | Eibach Springs | MS Air Filter | BMW Perf. Spoiler | BMW Perf. Splitters | Euro LCI Tail lights | Angel iBright v.3.0 | 20% Tint | Matte black Kidney Grills | CF Side Gills | Painted Reflectors | Black M3 emblem
|
|
Appreciate
0
|
11-30-2010, 03:00 PM | #8 | |
BEAST
2
Rep 152
Posts |
Quote:
|
|
Appreciate
0
|
11-30-2010, 03:06 PM | #9 |
Captain of the Enterprise
101
Rep 1,424
Posts |
Yes... perhaps it is the equator. LOL.
I should adjust my characterization of the downshift as it did rev-match, but I'm not sure what S-mode I was in. I guess it was more unsettling than physically brutal. You can imagine the feeling of accidentally hitting 1st gear at 30 MPH. I assure you I've read the manual cover to cover many times over. Every review. Alot of threads. I have a PhD in M3! But as in any academic study, I'll need some more experience to get used to things. I'm going to experiment with S4 and S5 more methodically and see which mode better compliments my driving style. Any recommendations for an after-market heads up display? ;-) Last edited by James T. Kirk; 11-30-2010 at 03:28 PM.. |
Appreciate
0
|
11-30-2010, 03:24 PM | #10 | |
Moderator
7512
Rep 19,368
Posts |
Quote:
If that's the case, then you should be doing the pre-turn downshifting yourself as well. Maybe I am missing something but I don't understand why you'd want to take the turn in the wrong gear to begin with. If your exit speed requires second gear to properly accelerate, then you should hit second gear as soon as your RPM falls to a reasonable level to allow it, IMHO. Also, as others have said, make sure you are in S4 or S5 (or S6 if you are driving with DSC off). Otherwise the downshifts will be slow and leisurely with some clutch slippage instead of fast and snappy with rev-matching. |
|
Appreciate
0
|
11-30-2010, 03:29 PM | #11 |
Second Lieutenant
43
Rep 262
Posts |
Try shifting before you make you turn in. I have never had mine shift unexpectedly in a turn...even on the track. It will however shift down if you are going way to slow for a particular gear in S mode.
Dolby
__________________
- 1998 E36M3/4 (retired)
- 2005 E46 330i ZHP (totaled) - 2007 E90 335i Black/Blk/Alu Trim (retired) - 2009 E90 M3 - Jet Blk on Blk mDCT - 1987 E30 325is - track car conversion in progress |
Appreciate
0
|
11-30-2010, 03:29 PM | #12 |
8300
19
Rep 573
Posts |
In manual mode DCT will downshift automatically if it thinks the gear is too high. At this point there is no turning back until you either stop or accelerate again. It seems like you are trying to downshift too late, so DCT takes over for you. Try downshifting earlier while breaking for the corner. What you describe happens to me when I am lazy and approaching a red traffic light.
|
Appreciate
0
|
11-30-2010, 03:30 PM | #13 |
Captain
87
Rep 725
Posts |
So it sounds like you are not angry about the downshifting...but the fact that you can't see the gear you are in...?
__________________
2016 340i M-Sport 6-MT(on order)
2013 335is (still have) 2011.5 M3 ZCP (traded in) |
Appreciate
0
|
11-30-2010, 03:33 PM | #14 |
First Lieutenant
48
Rep 378
Posts |
It won't automatically downshift to first unless you are practically stopped. You will usually hang in second for a quick stop sign, even if you do lose all momentum for an instant.
If your revs dropped enough to force a downshift in s mode during a turn you were in too high a gear going into the turn ( by 2?) or you turn like a soccer mom on Sunday. Pick your own explanation! Last edited by Locksmythe; 11-30-2010 at 03:44 PM.. |
Appreciate
0
|
11-30-2010, 03:47 PM | #15 |
Lieutenant Colonel
171
Rep 1,530
Posts |
1) For a 90 degree corner, downshift to 2nd just before the turn.
2) using S5 will always let you know when it downshifts cause you gonna hear a huge blip between 2nd and first.
__________________
2011 E92 JB/BL/DCT--->80K Miles
2015 F80 SS/SO/DCT?->28K Miles 2015 Porsche 911S |
Appreciate
0
|
11-30-2010, 03:49 PM | #16 |
Captain of the Enterprise
101
Rep 1,424
Posts |
Angry about my M3? Are you kidding?? I'm so in love with my car that when my friends ask me how is my baby, I have to ask them if they're talking about my child or my M3!
I'm just trying to figure out how to better suit my car. Not the other way around. I've owned manuals and auto transmissions including the former M3 SMG. This DCT is in a class by itself. I was taught, however, not to use downshifting as a means to braking. So say I'm driving in 6th gear... I normally slow for a turn using only my brake and then quickly downshift to my exit gear (usually 2nd or 3rd) to pull out of the turn with some good torque. Should I be downshifting through the braking process? I feel like I don't know how to drive anymore! LOL. |
Appreciate
0
|
11-30-2010, 03:52 PM | #17 |
8300
19
Rep 573
Posts |
|
Appreciate
0
|
11-30-2010, 04:06 PM | #18 |
First Lieutenant
48
Rep 378
Posts |
Downshift before you turn the wheel or you will give up some turning traction to the shift. There are some annoyances to not being able to control the clutch. Just have to set the mode to let the computer know how you would prefer it control the clutch on your behalf. Read the thread on dct lag to see how bad it used to be.
|
Appreciate
0
|
11-30-2010, 04:09 PM | #19 |
octane chick
79
Rep 1,187
Posts
Drives: ex-M
Join Date: Oct 2010
Location: Colorado
|
In D5, the DCT will downshift as a means of braking on its own. I like that, as I've been cruising in drive mode and had to stop suddenly. The DCT downshifted, adding to the stopping force. Very nice!
|
Appreciate
0
|
11-30-2010, 04:15 PM | #20 | |
Havin' a blast!
125
Rep 4,847
Posts |
Quote:
__________________
BRP 1:56 | CVR 2:01 | ACS 1:53 | WSIR 1:34
|
|
Appreciate
0
|
11-30-2010, 04:20 PM | #21 | |
Captain
15
Rep 751
Posts |
Quote:
As you mentioned, you have to know your gear. Also, you need to know exactly where you are in that gear, since the car really falls off rapidly in torque if you let the rpms down much. But, without the left foot occupied with a clutch, you can left foot brake, which is the real key to a seamless transition from braking to throttle, since you can modulate either, or both, as needed. And with the comfort of knowing the downshift is not going to upset the suspension, you have more flexibility in timing your shifts, sometimes taking one when you would not with a conventional manual. Good luck with it. DCT is a great technology, but it’s not perfect, and it has to be learned. |
|
Appreciate
0
|
11-30-2010, 04:23 PM | #22 |
DJ CURTIZ - Bringin' that fresh Electro House 2ya!
27
Rep 77
Posts |
Isn't there a fancy upgraded steering wheel that shows you what gear you are in amongst other things ???
__________________
www.djcurtiz.com - Fresh beats since 4-3V@ Free downloads of my House Tracks - www.soundcloud.com/djcurtiz |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|