DCT slow shifting on track

wwjd15 · 04-23-2011, 09:57 PM

Today at LVMS I had slow shifting issue, it happened during a few sessions. I wonder if my tranny was overheated or what was wrong.
When the shift getting slow, it would take up to 2k-2.5k rpm delay to shift a gear. For example, if I up-shift in 2nd gear at 7k rpm, the rpm would hit 8.5k before shifting into 3rd, about 1 second delay. It happened at any gear as well, so I had to shift at 6k-6.5k rpm which was really annoying. However, I didn't see any warming or something unusual. Can someone shed me some light on what's going on?

wwjd15 · 04-26-2011, 10:11 PM

hmm, am I the only one experienced this?

skierman64 · 04-26-2011, 10:20 PM

What transmission mode were you in? Did it make a difference if you changed modes?

wwjd15 · 04-26-2011, 10:36 PM

Quote:

Originally Posted by skierman64

What transmission mode were you in? Did it make a difference if you changed modes?

I only used one mode for the whole day. I believe it's sport, DSC off, S6.
For some sessions it shifted normal, and very crispy, but for others were not. I couldn't figure out why.

skierman64 · 04-26-2011, 10:48 PM

Next time it happens try S4 for a few laps and see if it makes a difference.

wwjd15 · 04-26-2011, 10:52 PM

Quote:

Originally Posted by skierman64

Next time it happens try S4 for a few laps and see if it makes a difference.

Thanks! I will.
It sucks the car didn't give me any error or notice.

rzm3 · 04-26-2011, 11:16 PM

Have not experienced this issue so far. Even in hot summer days.

dawgdog · 04-27-2011, 06:39 AM

I haven't experienced it either. What I have experienced is some problems early in my first session on some track days where it failed to downshift. I usually run in S5 with M mode on. Probably should not use M-mode but I drive on a track with little run off and do not carry insurance.

ChrisK · 04-27-2011, 07:51 AM

I remember reading somewhere that S6 was not a good choice for the track.

klammer · 04-27-2011, 09:21 AM

I run s5 all the time on track and have had zero issues. Not sure what is going on, but good luck

noxredna · 04-27-2011, 10:22 AM

Never faced this problem, try switching up settings and than going back to S5 or S6 depends whether you have DSC off or not. If it still persists, pit-in turn off the car, take your keys out and restart the car. The DCT transmission is strongly controlled by the ECU and sometimes you really never know with electronics.

I have overheated my transmission before in Willow Springs last summer, reached around 270F and they give a warning error light and the transmission will not shift at all until it cools down. Scary, because I could get my transmission over heated within 2 laps of willow springs albeit the ambient temperature was close to 95F.

Other than that, I have tracked the DCT for over 15 trackdays and have no issues with it.

If it still persists, stop by the dealership and ask them to take a look - obviously don't tell them that the problem existed on the track but rather hard driving on the road.

Brosef · 04-27-2011, 11:21 AM

could be that the transmission was getting hot. I agree with the others that you should give S4 a try. that's what I use 100% of the time (both on the street and on the track). I like S4 the most because it gives you the rev-matched downshifts, but doesn't give you as much of a power "surge" when upshifting, so it doesn't upset the chassis as much when you shift mid-turn.

I also have a DCT temp gauge in my car and I've noticed that with spirited driving and a lot of shifting, S6 generates more heat than S4. that's obviously not surprising, but I thought I'd throw that out there as a data point.

Montoya · 09-11-2011, 01:04 PM

This weekend two of us had this same issue. We were both on S4. We were at ORP which is 2200 feet and it was 92 degrees... Not sure what the equivalent temp would be at sea level.

Anyways, it was about a second delay. Sometimes if I breathed the shifting for a lap it would go back to normal...

stega · 09-12-2011, 10:13 AM

Do you happen to know what version of the dct software you have??

Reason I ask is ESS said their DCT software made the clutch engage quicker and in return there was less heat.
But
ESS also said that if you had BMW's latest DCT software you would not need their software because it had been greatly improved and worked just fine with their kits 575+...

Montoya · 09-12-2011, 11:24 AM

Quote:

Originally Posted by stega

Do you happen to know what version of the dct software you have??

Reason I ask is ESS said their DCT software made the clutch engage quicker and in return there was less heat.
But
ESS also said that if you had BMW's latest DCT software you would not need their software because it had been greatly improved and worked just fine with their kits 575 ...

Mine is fully up to date, the other individual who had the issue is an '11, so I'm assuming it also is fully up to date. One other point mention is that orp is a pretty low speed circuit, in combination with altitude, makes cooling an issue.

wwjd15 · 09-12-2011, 12:21 PM

yes. Mine is 2011. I think it should be newer version? I had this problem again and again... probably trannly oil cooler is must.

persian54 · 09-12-2011, 12:39 PM

Quote:

Originally Posted by wwjd15

yes. Mine is 2011. I think it should be newer version? I had this problem again and again... probably trannly oil cooler is must.

You're just too fast Ricky :P

stega · 09-12-2011, 12:40 PM

Quote:

Originally Posted by wwjd15

yes. Mine is 2011. I think it should be newer version? I had this problem again and again... probably trannly oil cooler is must.

Should be....

A bit off topic. Can I see your rear seat closeout/delete??

I saw you have one in your sig and I am making one for myself at the moment and wanted to see as many as possible...?

wwjd15 · 09-12-2011, 12:43 PM

Quote:

Originally Posted by persian54

You're just too fast Ricky :P

LOL~ I wish that's the cause.

Quote:

Originally Posted by stega

Should be....

A bit off topic. Can I see your rear seat closeout/delete??

I saw you have one in your sig and I am making one for myself at the moment and wanted to see as many as possible...?

My buddies just took some shoot yesterday. I'll post up once they finish.

stega · 09-12-2011, 12:55 PM

Ok perfect. I saw those shots in your thread but none of the interior yet.

0-60Motorsports · 04-03-2012, 06:33 AM

Can you tell us which oil cooler u used for the DCT please? Thanks

MaxL · 04-03-2012, 09:31 AM

I've heard about that happening in S6 several times before. Seems like this mode is optimized for straight line acceleration, and not as much for track driving. The engine does not reduce power much if at all during the shift so there is great deal more slip and heat produced in S6. I am not fast enough to overheat DCT (also, it's cold here most of the time), but still prefer S5 and S4 for track driving to avoid traction loss while shifting 2->3.

04-23-2011, 09:57 PM	#1
wwjd15 Drives: 11 E92 M3 MR Join Date: May 2009 Location: Orange County Posts: 1,258 iTrader: (6)	DCT slow shifting on track Today at LVMS I had slow shifting issue, it happened during a few sessions. I wonder if my tranny was overheated or what was wrong. When the shift getting slow, it would take up to 2k-2.5k rpm delay to shift a gear. For example, if I up-shift in 2nd gear at 7k rpm, the rpm would hit 8.5k before shifting into 3rd, about 1 second delay. It happened at any gear as well, so I had to shift at 6k-6.5k rpm which was really annoying. However, I didn't see any warming or something unusual. Can someone shed me some light on what's going on? __________________ Build #1 NA: Big Willow 1:30.449 (NT01), Buttonwillow 13CW 1:56.634 (NT01), Autoclub Speedway Fontana 1:49.422 (NT01), Mfest2012 LMVS 1:59.002 (NT01+AD08), Streets of Willow 1:22.36 (RS3), Chuckwalla 2:02.46 (RS3), Laguna Seca 1:41.74 (R888), Infineon 1:50.346 (R888) Build #2 VF SC: Buttonwillow 13CW 1:54.037 (TD), Big Willow 1:29.63 (R888)
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04-26-2011, 10:11 PM	#2
wwjd15 Drives: 11 E92 M3 MR Join Date: May 2009 Location: Orange County Posts: 1,258 iTrader: (6)	hmm, am I the only one experienced this? __________________ Build #1 NA: Big Willow 1:30.449 (NT01), Buttonwillow 13CW 1:56.634 (NT01), Autoclub Speedway Fontana 1:49.422 (NT01), Mfest2012 LMVS 1:59.002 (NT01+AD08), Streets of Willow 1:22.36 (RS3), Chuckwalla 2:02.46 (RS3), Laguna Seca 1:41.74 (R888), Infineon 1:50.346 (R888) Build #2 VF SC: Buttonwillow 13CW 1:54.037 (TD), Big Willow 1:29.63 (R888)

04-26-2011, 10:20 PM	#3
skierman64 Brigadier General Drives: 2008 E92 Space Gray M3 & E36M3 Join Date: Dec 2006 Location: Greater St Louis Metro area Posts: 3,069 iTrader: (1) Garage List 1998 M3 Coupe [0.00] 2008 M3 Coupe [0.00]	What transmission mode were you in? Did it make a difference if you changed modes? __________________ Get a professional motorsports full featured stopwatch app for your Blackberry here: http://appworld.blackberry.com/webstore/content/19464 Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive

04-26-2011, 10:48 PM	#5
skierman64 Brigadier General Drives: 2008 E92 Space Gray M3 & E36M3 Join Date: Dec 2006 Location: Greater St Louis Metro area Posts: 3,069 iTrader: (1) Garage List 1998 M3 Coupe [0.00] 2008 M3 Coupe [0.00]	Next time it happens try S4 for a few laps and see if it makes a difference. __________________ Get a professional motorsports full featured stopwatch app for your Blackberry here: http://appworld.blackberry.com/webstore/content/19464 Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive

04-26-2011, 11:16 PM	#7
rzm3 Moderator Drives: 2008 M3 Join Date: Aug 2007 Location: IL/TX Posts: 4,569 iTrader: (13)	Have not experienced this issue so far. Even in hot summer days. __________________ Powered by M-World / AiM Evo4 Data Logger / KW Competition 2-Way / Brembo GT 365 / Pagid Yellow RS-29 / Rear Seats Delete Previous Mods: RBM3 / StopTech 380/355 / Moton Clubsport & Street Sport / Dinan Stage 1 / H&R Sport / M-World GT4 Aero / Eisenmann Sport & Race / Akrapovic Slip-On

04-27-2011, 06:39 AM	#8
dawgdog Colonel Drives: 08 e92 M3 dct Join Date: Oct 2006 Location: Seattle, Wa. Posts: 2,075 iTrader: (0)	I haven't experienced it either. What I have experienced is some problems early in my first session on some track days where it failed to downshift. I usually run in S5 with M mode on. Probably should not use M-mode but I drive on a track with little run off and do not carry insurance. __________________ AW on Fox Red Extended, Alum trim, ZPP, ZTP, DCT, 19" wheels, Heated front seats, HD radio, Sat radio, I-pod & usb, Premium sound, AP racing BBK, 18 Volk Racing TE 37s, Akrapovic Evolution exhaust, AST suspension

04-27-2011, 07:51 AM	#9
ChrisK Brigadier General Drives: 2011 E92 M3 Join Date: Jun 2007 Location: IL Posts: 4,679 iTrader: (4)	I remember reading somewhere that S6 was not a good choice for the track. __________________ 2011 E92 M3: AW/BLK • DCT Europäische Lieferung am 6. August 2010

04-27-2011, 09:21 AM	#10
klammer Colonel Drives: 11 spc gry m3 e90, 07 X5 Join Date: Jan 2010 Location: chicago Posts: 2,762 iTrader: (0)	I run s5 all the time on track and have had zero issues. Not sure what is going on, but good luck __________________ mods: akra evo, dinan 3.45 diff, ess akra tune, dinan stg.3, Alcon bbk, HRE P40

04-27-2011, 10:22 AM	#11
noxredna Captain Drives: 2008 BMW M3 Coupe, 2012 BMW M5 Join Date: Sep 2008 Location: Philadelphia & Singapore Posts: 668 iTrader: (0)	Never faced this problem, try switching up settings and than going back to S5 or S6 depends whether you have DSC off or not. If it still persists, pit-in turn off the car, take your keys out and restart the car. The DCT transmission is strongly controlled by the ECU and sometimes you really never know with electronics. I have overheated my transmission before in Willow Springs last summer, reached around 270F and they give a warning error light and the transmission will not shift at all until it cools down. Scary, because I could get my transmission over heated within 2 laps of willow springs albeit the ambient temperature was close to 95F. Other than that, I have tracked the DCT for over 15 trackdays and have no issues with it. If it still persists, stop by the dealership and ask them to take a look - obviously don't tell them that the problem existed on the track but rather hard driving on the road.

04-27-2011, 11:21 AM	#12
Brosef Lieutenant Colonel Drives: 2011 M Join Date: Aug 2009 Location: Chicago Posts: 1,517 iTrader: (3)	could be that the transmission was getting hot. I agree with the others that you should give S4 a try. that's what I use 100% of the time (both on the street and on the track). I like S4 the most because it gives you the rev-matched downshifts, but doesn't give you as much of a power "surge" when upshifting, so it doesn't upset the chassis as much when you shift mid-turn. I also have a DCT temp gauge in my car and I've noticed that with spirited driving and a lot of shifting, S6 generates more heat than S4. that's obviously not surprising, but I thought I'd throw that out there as a data point.

09-11-2011, 01:04 PM	#13
Montoya Lieutenant Drives: M3 Join Date: Apr 2009 Location: Portland Posts: 573 iTrader: (0)	This weekend two of us had this same issue. We were both on S4. We were at ORP which is 2200 feet and it was 92 degrees... Not sure what the equivalent temp would be at sea level. Anyways, it was about a second delay. Sometimes if I breathed the shifting for a lap it would go back to normal... __________________ '08 E92 IB, Gone '10 GT3 now in my garage! '10 X5 3.5D '12 E91 Xi Wagon MT sports package

09-12-2011, 10:13 AM	#14
stega Captain Drives: 2011 M3 E93 Join Date: Nov 2010 Location: Boca Raton, FL Posts: 666 iTrader: (3)	Do you happen to know what version of the dct software you have?? Reason I ask is ESS said their DCT software made the clutch engage quicker and in return there was less heat. But ESS also said that if you had BMW's latest DCT software you would not need their software because it had been greatly improved and worked just fine with their kits 575+...

09-12-2011, 12:21 PM	#16
wwjd15 Drives: 11 E92 M3 MR Join Date: May 2009 Location: Orange County Posts: 1,258 iTrader: (6)	yes. Mine is 2011. I think it should be newer version? I had this problem again and again... probably trannly oil cooler is must. __________________ Build #1 NA: Big Willow 1:30.449 (NT01), Buttonwillow 13CW 1:56.634 (NT01), Autoclub Speedway Fontana 1:49.422 (NT01), Mfest2012 LMVS 1:59.002 (NT01+AD08), Streets of Willow 1:22.36 (RS3), Chuckwalla 2:02.46 (RS3), Laguna Seca 1:41.74 (R888), Infineon 1:50.346 (R888) Build #2 VF SC: Buttonwillow 13CW 1:54.037 (TD), Big Willow 1:29.63 (R888)

09-12-2011, 12:55 PM	#20
stega Captain Drives: 2011 M3 E93 Join Date: Nov 2010 Location: Boca Raton, FL Posts: 666 iTrader: (3)	Ok perfect. I saw those shots in your thread but none of the interior yet.

04-03-2012, 06:33 AM	#21
0-60Motorsports Captain Drives: BMW M3 JB 04 Coupe Join Date: Aug 2007 Location: Kingdom of Bahrain Posts: 885 iTrader: (1)	Can you tell us which oil cooler u used for the DCT please? Thanks __________________ Current Mods: GC Coilovers, Eibach Sways, RE RTABs/RSMs/RCAs, INTRAVEE II + Alpine KCA-420i, Black Roundels, ///MFEST Badges, Depo's, Screen protector for OEM 16:9 display, VCSL Bumper + Race Lip, CF Boot, CF Rear Diffusor, DIETZ TV in Motion, AP Headers, RT Cats, Oem exhaust + 80mm tips, Z8 Starter Button, Lamin-X, GM SMG Paddles, 0-60 Steering, OEM CSL interior, OEM CSL Intake, EVOLVE Tune, BBS CH's, 3K AE's & Low Beams, FX-R Proj

04-03-2012, 09:31 AM	#22
MaxL Captain Drives: M3 e90 Join Date: Jun 2007 Location: Toronto Posts: 842 iTrader: (0)	I've heard about that happening in S6 several times before. Seems like this mode is optimized for straight line acceleration, and not as much for track driving. The engine does not reduce power much if at all during the shift so there is great deal more slip and heat produced in S6. I am not fast enough to overheat DCT (also, it's cold here most of the time), but still prefer S5 and S4 for track driving to avoid traction loss while shifting 2->3. __________________ Running a business is like driving on a race track - My Blog

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