Launch control issue

eclause13 · 02-11-2013, 07:12 PM

Alright so I have a 09 e92 m3 with the DCT and I followed these steps to do the launch control.....

1 Turn on power button
2 Turn off DSC
3 Drove more then 6 miles and pushed up the 6 bars
4 Released brake and held forward until checkered flag shows up
5 Gas all the way down
6 Release shifter and held gas down

My issue is that when I release the brake and then put the gas to the floor the car moves like the clutch is slipping. I'm on flat ground so that isn't the issue. Any suggestions to what I'm doing wrong? Thanks.

kevin///mlee · 02-11-2013, 07:18 PM

Does it roll forward before you push the shifter forward and press on the gas pedal? If it does then the ground isn't perfectly flat

SYZ · 02-11-2013, 07:21 PM

Are you positive you are on flat ground? My car will roll forward the same way if its not perfect. It seems I can only engage launch control 5% of the time because of this.

Your steps are correct.. oil temp needs to be at normal temperatures as well otherwise it won't work, but if the checkered flag is coming up, then it should be working fine. Are you actually seeing the flag? How is the car moving like the clutch is slipping? Can you describe it better?

eclause13 · 02-11-2013, 07:50 PM

Yes the checkered flag does show up. As soon as I let off the brake and hold the shifter forward then push the gas pedal down is when it starts moving forward. I will double check to make sure the ground is perfectly flat again though.

1SICKM · 02-11-2013, 08:47 PM

The car moves forward even on flat ground due to engine vibration. As soon as u get the flag and it revs, release the stick quickly. Why are u launching on the street? You won't gain anything and have everything to loose...

SYZ · 02-11-2013, 09:09 PM

What's the issue with launching on the street? There isn't anything illegal about it in lots of places.

1SICKM · 02-11-2013, 09:56 PM

Quote:

Originally Posted by SYZ

What's the issue with launching on the street? There isn't anything illegal about it in lots of places.

I never said it was illegal. All your gonna get is a lot of wheel spin, even on R compound tires. If you get wheel hop which is possible, you run the risk of breaking something in the rear. So I'll ask,you again....what are you trying to accomplish? If its spinning tires and looking cool you will accomplish that. If your trying to get a good launch, it will never happen.

M3takesNYC · 02-11-2013, 10:01 PM

LC allows me a perfect launch and allows the quickest times I ever am able to do with a DCT. Only other option is to just press the pedal down from a stop but the problem is you waste time in 1-5k RPMS where the engine is not in its powerband whereas LC allows you to access the powerband from time 0.

I don't do it often but for the best launch it certainly works.

eclause13 · 02-11-2013, 10:08 PM

I just got the car and don't plan on ever tracking the car. I wanted to try the LC.

M3takesNYC · 02-11-2013, 10:28 PM

OP, go ahead and enjoy the car, including LC! BMW did not put it there not to use and they cannot and will not deny a claim for its use. Sure, using it all the time is silly as ultimately what is the point but to use it a few times here or there to feel what a full out pull feels like from a stop is pretty cool.

I personally get more enjoyment out of slower rolling bursts in 2nd gear. You get the full press back into your seat and are at the powerband the entire time with no tire spin. Best "feeling" in my view.

SYZ · 02-11-2013, 11:07 PM

Quote:

Originally Posted by 1SICKM

I never said it was illegal. All your gonna get is a lot of wheel spin, even on R compound tires. If you get wheel hop which is possible, you run the risk of breaking something in the rear. So I'll ask,you again....what are you trying to accomplish? If its spinning tires and looking cool you will accomplish that. If your trying to get a good launch, it will never happen.

I don't get much wheelspin when I use it. It takes off pretty well. I bet with a supercharger it is pretty useless though.

JuRuKi · 02-12-2013, 06:18 PM

I read somewhere in this forum that with DCT if you floor the pedal from a dead stop past the click it does some type of launch? can anyone confirm this?

1SICKM · 02-12-2013, 07:01 PM

correct. It drops the clutch at 3k. do it enough times and you will fry your clutch! Guaranteed....happened to well known forum member after one day at the 1/4 mile track

JuRuKi · 02-12-2013, 08:37 PM

^^ thx for the heads up

EliteM3 · 02-13-2013, 12:20 AM

I have the same problem. You can't have the brake on to initiate launch control. And the car will not roll forward until you floor it...at which point I still haven't released the lever.

I don't get how you can use this usefully if it rolls forward when you don't want to.

It's like the engine revving is slowly engaging the clutch pushing the car forward. Weak!

Nordstat · 02-13-2013, 12:48 PM

Quote:

Originally Posted by 1SICKM

correct. It drops the clutch at 3k. do it enough times and you will fry your clutch! Guaranteed....happened to well known forum member after one day at the 1/4 mile track

And this is worse than LC, which seems to drop the clutch at ~5k?

No sarcasm...just seems counter intuitive.

C|3R1C · 02-13-2013, 05:50 PM

Quote:

Originally Posted by Nordstat

And this is worse than LC, which seems to drop the clutch at ~5k?

No sarcasm...just seems counter intuitive.

I read on a thread here stating when you floor it from a stop, the clutch slips a little on purpose to produce a smooth start. LC on the other hand is a controlled clutch drop intended to protect the tranny and keep the clutch from slipping/glazing. The computer controls those two in different ways. Something to this effect was in the thread of how to maintain your tranny with a vt650.

CanAutM3 · 02-13-2013, 07:55 PM

Quote:

Originally Posted by eclause13

Alright so I have a 09 e92 m3 with the DCT and I followed these steps to do the launch control.....

1 Turn on power button
2 Turn off DSC
3 Drove more then 6 miles and pushed up the 6 bars
4 Released brake and held forward until checkered flag shows up
5 Gas all the way down
6 Release shifter and held gas down

My issue is that when I release the brake and then put the gas to the floor the car moves like the clutch is slipping. I'm on flat ground so that isn't the issue. Any suggestions to what I'm doing wrong? Thanks.

Does not answer your question, however just for your info, your step 1 is not required. You do not need the "power" button to be engaged to activate launch control.

PhoenixRising · 02-15-2013, 09:35 AM

I can't wait to get out of the break-in period so I can try this out. Patience is NOT one of my virtues.

02-11-2013, 07:12 PM	#1
eclause13 Enlisted Member Drives: 2009 E92 M3 DCT Join Date: Oct 2011 Location: Schaumburg, IL Posts: 41 iTrader: (0) Garage List 2009 BMW E92 [0.00]	Launch control issue Alright so I have a 09 e92 m3 with the DCT and I followed these steps to do the launch control..... 1 Turn on power button 2 Turn off DSC 3 Drove more then 6 miles and pushed up the 6 bars 4 Released brake and held forward until checkered flag shows up 5 Gas all the way down 6 Release shifter and held gas down My issue is that when I release the brake and then put the gas to the floor the car moves like the clutch is slipping. I'm on flat ground so that isn't the issue. Any suggestions to what I'm doing wrong? Thanks.
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02-11-2013, 08:47 PM	#5
1SICKM Captain Drives: 2009 M3 E92 Join Date: Oct 2010 Location: Mansfield, NJ Posts: 858 iTrader: (5)	The car moves forward even on flat ground due to engine vibration. As soon as u get the flag and it revs, release the stick quickly. Why are u launching on the street? You won't gain anything and have everything to loose... __________________ E92 M3 DCT...Powered by ESS VT2 650 Aquamist HFS-3 CURRENT WORLD RECORD HOLDER 1/4 MILE - 12/7/12 (ESS VT2 625, Meth Off) ATCO RACEWAY: 10.65 @ 131.79MPH 1.725 60FT

02-12-2013, 07:01 PM	#13
1SICKM Captain Drives: 2009 M3 E92 Join Date: Oct 2010 Location: Mansfield, NJ Posts: 858 iTrader: (5)	correct. It drops the clutch at 3k. do it enough times and you will fry your clutch! Guaranteed....happened to well known forum member after one day at the 1/4 mile track __________________ E92 M3 DCT...Powered by ESS VT2 650 Aquamist HFS-3 CURRENT WORLD RECORD HOLDER 1/4 MILE - 12/7/12 (ESS VT2 625, Meth Off) ATCO RACEWAY: 10.65 @ 131.79MPH 1.725 60FT

02-15-2013, 09:35 AM	#19
PhoenixRising Important text here Drives: 2013 M3 Conv Join Date: Dec 2012 Location: Phoenix, AZ Posts: 100 iTrader: (0) Garage List 2013 BMW E93 M3 [0.00] 2004 Porsche 911 C4S [0.00]	I can't wait to get out of the break-in period so I can try this out. Patience is NOT one of my virtues. __________________ 2013 M3 Conv - AlpWhite/Black/DCT, AA exhaust, BPMSport StageII tune & code 2007 X5 4.8i (sold for 2013 M3 Conv) 2003 X3 3.0 (sold for 2007 X5) 2004 Porsche 911 C4S Conv

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02-11-2013, 07:18 PM	#2
kevin///mlee Private First Class Drives: EX0 M3 Join Date: Sep 2012 Location: NorCal Posts: 141 iTrader: (1)	Does it roll forward before you push the shifter forward and press on the gas pedal? If it does then the ground isn't perfectly flat

02-11-2013, 07:21 PM	#3
SYZ troll Drives: E93 ///M3, C32 ///AMG Join Date: Jan 2013 Location: Scottsdale Posts: 118 iTrader: (0)	Are you positive you are on flat ground? My car will roll forward the same way if its not perfect. It seems I can only engage launch control 5% of the time because of this. Your steps are correct.. oil temp needs to be at normal temperatures as well otherwise it won't work, but if the checkered flag is coming up, then it should be working fine. Are you actually seeing the flag? How is the car moving like the clutch is slipping? Can you describe it better?

02-11-2013, 07:50 PM	#4
eclause13 Enlisted Member Drives: 2009 E92 M3 DCT Join Date: Oct 2011 Location: Schaumburg, IL Posts: 41 iTrader: (0) Garage List 2009 BMW E92 [0.00]	Yes the checkered flag does show up. As soon as I let off the brake and hold the shifter forward then push the gas pedal down is when it starts moving forward. I will double check to make sure the ground is perfectly flat again though.

02-11-2013, 09:09 PM	#6
SYZ troll Drives: E93 ///M3, C32 ///AMG Join Date: Jan 2013 Location: Scottsdale Posts: 118 iTrader: (0)	What's the issue with launching on the street? There isn't anything illegal about it in lots of places.

02-11-2013, 10:01 PM	#8
M3takesNYC Banned Drives: m3 Join Date: Feb 2013 Location: NYC Posts: 426 iTrader: (0)	LC allows me a perfect launch and allows the quickest times I ever am able to do with a DCT. Only other option is to just press the pedal down from a stop but the problem is you waste time in 1-5k RPMS where the engine is not in its powerband whereas LC allows you to access the powerband from time 0. I don't do it often but for the best launch it certainly works.

02-11-2013, 10:08 PM	#9
eclause13 Enlisted Member Drives: 2009 E92 M3 DCT Join Date: Oct 2011 Location: Schaumburg, IL Posts: 41 iTrader: (0) Garage List 2009 BMW E92 [0.00]	I just got the car and don't plan on ever tracking the car. I wanted to try the LC.

02-11-2013, 10:28 PM	#10
M3takesNYC Banned Drives: m3 Join Date: Feb 2013 Location: NYC Posts: 426 iTrader: (0)	OP, go ahead and enjoy the car, including LC! BMW did not put it there not to use and they cannot and will not deny a claim for its use. Sure, using it all the time is silly as ultimately what is the point but to use it a few times here or there to feel what a full out pull feels like from a stop is pretty cool. I personally get more enjoyment out of slower rolling bursts in 2nd gear. You get the full press back into your seat and are at the powerband the entire time with no tire spin. Best "feeling" in my view.

02-12-2013, 06:18 PM	#12
JuRuKi Private Drives: E90 M3 Join Date: Sep 2012 Location: SoCaL Posts: 71 iTrader: (1)	I read somewhere in this forum that with DCT if you floor the pedal from a dead stop past the click it does some type of launch? can anyone confirm this?

02-12-2013, 08:37 PM	#14
JuRuKi Private Drives: E90 M3 Join Date: Sep 2012 Location: SoCaL Posts: 71 iTrader: (1)	^^ thx for the heads up

02-13-2013, 12:20 AM	#15
EliteM3 Private Drives: 2009 E90 M3 Join Date: May 2012 Location: Morgan Hill, CA Posts: 90 iTrader: (0)	I have the same problem. You can't have the brake on to initiate launch control. And the car will not roll forward until you floor it...at which point I still haven't released the lever. I don't get how you can use this usefully if it rolls forward when you don't want to. It's like the engine revving is slowly engaging the clutch pushing the car forward. Weak!