uh DCT lag?

JZBDCT · 03-22-2012, 04:31 PM

I"m driving in MDM and in manual mode and when I'm I"m in second with my heavy foot, the car is lurching forward like I'm a worried father teaching his daughter how to drive. What is this? Am I doing something wrong? Is this what other BMW drivers were experiencing?

kitw · 03-22-2012, 04:35 PM

If it's cold, then that is normal. Which mode is the throttle in, sport? Sometimes, it's an foot problem, the acceleration throws your foot off the pedal...

In Extremis · 03-22-2012, 08:58 PM

I think I know what you're talking about. I discovered it the first week I owned an e92 when driving in flip flops. If the acceleration throws your foot off or your foot sticks at all when accelerating hard at low speeds, the car will lurch. I believe it's because the engine decelerates very quickly when power is interrupted and then gets the signal very quickly for a lot of power. It moves suddenly, interrupts power again, and you're in that cycle of lurching.

Zzhou · 03-22-2012, 11:47 PM

I have experienced this both in 1st, and 2nd gear when try to keep RPM at 5000. Maybe its just normal.

Verify · 03-23-2012, 10:38 AM

yup

Moxie · 03-23-2012, 11:12 AM

Quote:

Originally Posted by Baggy_M

ive had mine for a few weeks now, its like stated above, noticable when its cold and your new to the car. after a week or so i have not felt it really

After a little while you learn how to drive w/o the bucking.

JDM3 · 03-23-2012, 11:47 AM

What year do you have? 2008 and early 09's had lag until the dealer fixed with a DCT flash. My late 09 has no lag

aresh · 03-23-2012, 12:23 PM

You need the software update

///M Ryder · 03-23-2012, 01:54 PM

Quote:

Originally Posted by aresh

You need the software update

Not in a 2012.....it's all in the foot...............Phil

bigjae1976 · 03-23-2012, 07:10 PM

When its cold, the car may lurch if you are not smooth with the gas.

Also, I've found that when decelerating in S4/5 that once the car starts to down shift itself, it usually will not respond to a manual downshift and takes a second if you decide to mash the throttle and upshift.

GIdriver · 03-23-2012, 07:30 PM

Quote:

Originally Posted by ///M Ryder

Not in a 2012.....it's all in the foot...............Phil

^ This.

JZBDCT · 03-24-2012, 03:07 AM

Quote:

Originally Posted by bigjae1976

When its cold, the car may lurch if you are not smooth with the gas.

Also, I've found that when decelerating in S4/5 that once the car starts to down shift itself, it usually will not respond to a manual downshift and takes a second if you decide to mash the throttle and upshift.

Thank you!

03-22-2012, 04:31 PM	#1
JZBDCT Second Lieutenant 15 Rep 214 Posts Drives: e92 Join Date: Jul 2011 Location: yonder iTrader: (0)	uh DCT lag? I"m driving in MDM and in manual mode and when I'm I"m in second with my heavy foot, the car is lurching forward like I'm a worried father teaching his daughter how to drive. What is this? Am I doing something wrong? Is this what other BMW drivers were experiencing? __________________ 2012 BMW M3 Coupe JZB/Fox Red DCT ZCP. Vorsteiner Double Sided Carbon Fiber CSL Boot Lid. Paint Match Grills, Side markers, Reflectors. Carbon Fiber Splitters. Lux Angel Eyes. Custom Rear Section Exhaust with valves. Next mod: Valentine 1
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03-22-2012, 04:35 PM	#2
kitw Colonel 471 Rep 2,991 Posts Drives: F91 M8, 991.2 GT3 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (20)	If it's cold, then that is normal. Which mode is the throttle in, sport? Sometimes, it's an foot problem, the acceleration throws your foot off the pedal...
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03-22-2012, 08:58 PM	#3
In Extremis First Lieutenant 38 Rep 385 Posts Drives: G42 M240i xdrive Join Date: Aug 2010 Location: Long Island, NY iTrader: (1)	I think I know what you're talking about. I discovered it the first week I owned an e92 when driving in flip flops. If the acceleration throws your foot off or your foot sticks at all when accelerating hard at low speeds, the car will lurch. I believe it's because the engine decelerates very quickly when power is interrupted and then gets the signal very quickly for a lot of power. It moves suddenly, interrupts power again, and you're in that cycle of lurching.
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03-22-2012, 11:47 PM	#4
Zzhou Captain 57 Rep 600 Posts Drives: 2012 E92 SSII ZCP DCT Join Date: Aug 2011 Location: West Lafayette,IN/Shanghai,China iTrader: (0)	I have experienced this both in 1st, and 2nd gear when try to keep RPM at 5000. Maybe its just normal. __________________ AA Green Filter/AA Pulley/AA catless X-pipes/AA signature exhaust/AA TUNE/TMS studs/Project Kics R40/R888/VOLK ZE40/ST60,ST40 BBK/MCS 2WAY NR/Vorsteiner GTS5 Bumper/APR GT250/APR SPLITTER
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03-23-2012, 10:38 AM	#5
Verify Captain 23 Rep 638 Posts Drives: M3 Join Date: Mar 2012 Location: MD-NY iTrader: (1)	yup Last edited by Verify; 04-04-2013 at 01:09 PM..
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03-23-2012, 11:47 AM	#7
JDM3 Major 109 Rep 1,292 Posts Drives: 2009 M3 E92 Join Date: Oct 2010 Location: Long Valley, NJ iTrader: (7)	What year do you have? 2008 and early 09's had lag until the dealer fixed with a DCT flash. My late 09 has no lag
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03-23-2012, 12:23 PM	#8
aresh First Lieutenant 31 Rep 369 Posts Drives: 2006 550i Join Date: May 2009 Location: NY iTrader: (1)	You need the software update
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03-23-2012, 07:10 PM	#10
bigjae1976 Major General 1570 Rep 8,075 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	When its cold, the car may lurch if you are not smooth with the gas. Also, I've found that when decelerating in S4/5 that once the car starts to down shift itself, it usually will not respond to a manual downshift and takes a second if you decide to mash the throttle and upshift. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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