BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
European Auto Source (EAS)
Post Reply
 
Thread Tools Search this Thread
      02-11-2013, 06:12 PM   #1
eclause13
Enlisted Member
United_States
7
Rep
42
Posts

Drives: 2009 E92 M3 DCT
Join Date: Oct 2011
Location: Schaumburg, IL

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.
Appreciate 0
      02-11-2013, 06:18 PM   #2
s14_kev
Major
s14_kev's Avatar
367
Rep
1,036
Posts

Drives: E90 M3, E30 M3
Join Date: Sep 2012
Location: Bay Area, CA

iTrader: (21)

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
Appreciate 0
      02-11-2013, 06:21 PM   #3
SYZ
Lieutenant
SYZ's Avatar
34
Rep
454
Posts

Drives: :O
Join Date: Jan 2013
Location: Scottsdale

iTrader: (0)

Garage List
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?
Appreciate 0
      02-11-2013, 06:50 PM   #4
eclause13
Enlisted Member
United_States
7
Rep
42
Posts

Drives: 2009 E92 M3 DCT
Join Date: Oct 2011
Location: Schaumburg, IL

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.
Appreciate 0
      02-11-2013, 07:47 PM   #5
JDM3
Major
JDM3's Avatar
109
Rep
1,292
Posts

Drives: 2009 M3 E92
Join Date: Oct 2010
Location: Long Valley, NJ

iTrader: (7)

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...
Appreciate 0
      02-11-2013, 08:09 PM   #6
SYZ
Lieutenant
SYZ's Avatar
34
Rep
454
Posts

Drives: :O
Join Date: Jan 2013
Location: Scottsdale

iTrader: (0)

Garage List
What's the issue with launching on the street? There isn't anything illegal about it in lots of places.
Appreciate 0
      02-11-2013, 08:56 PM   #7
JDM3
Major
JDM3's Avatar
109
Rep
1,292
Posts

Drives: 2009 M3 E92
Join Date: Oct 2010
Location: Long Valley, NJ

iTrader: (7)

Quote:
Originally Posted by SYZ View Post
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.
Appreciate 0
      02-11-2013, 09:01 PM   #8
M3takesNYC
Banned
19
Rep
426
Posts

Drives: m3
Join Date: Feb 2013
Location: NYC

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.
Appreciate 0
      02-11-2013, 09:08 PM   #9
eclause13
Enlisted Member
United_States
7
Rep
42
Posts

Drives: 2009 E92 M3 DCT
Join Date: Oct 2011
Location: Schaumburg, IL

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.
Appreciate 0
      02-11-2013, 09:28 PM   #10
M3takesNYC
Banned
19
Rep
426
Posts

Drives: m3
Join Date: Feb 2013
Location: NYC

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.
Appreciate 0
      02-11-2013, 10:07 PM   #11
SYZ
Lieutenant
SYZ's Avatar
34
Rep
454
Posts

Drives: :O
Join Date: Jan 2013
Location: Scottsdale

iTrader: (0)

Garage List
Quote:
Originally Posted by 1SICKM View Post
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.
Appreciate 0
      02-12-2013, 05:18 PM   #12
JuRuKi
Private First Class
9
Rep
130
Posts

Drives: E90 M3
Join Date: Sep 2012
Location: SoCaL

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?
Appreciate 0
      02-12-2013, 06:01 PM   #13
JDM3
Major
JDM3's Avatar
109
Rep
1,292
Posts

Drives: 2009 M3 E92
Join Date: Oct 2010
Location: Long Valley, NJ

iTrader: (7)

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
Appreciate 0
      02-12-2013, 07:37 PM   #14
JuRuKi
Private First Class
9
Rep
130
Posts

Drives: E90 M3
Join Date: Sep 2012
Location: SoCaL

iTrader: (1)

^^ thx for the heads up
Appreciate 0
      02-12-2013, 11:20 PM   #15
EliteM3
Private First Class
United_States
21
Rep
176
Posts

Drives: 2009 E90 M3
Join Date: May 2012
Location: Morgan Hill, CA

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!
__________________
09 Space Gray E90 M3 DCT: BPM (Stage 1, DCT and Servotronic) tune, Gintani Sport Exhaust, Dinan Intake
Appreciate 0
      02-13-2013, 11:48 AM   #16
Nordstat
Lieutenant
United_States
36
Rep
529
Posts

Drives: 2014 Porsche 911 Turbo S
Join Date: Dec 2012
Location: Los Angeles

iTrader: (0)

Quote:
Originally Posted by 1SICKM View Post
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.
__________________
2014 Porsche 911 Turbo S - FOR SALE
2010 BMW M3 (e90) - SOLD
2005 Corvette C6 - SOLD
Appreciate 0
      02-13-2013, 04:50 PM   #17
C|3R1C
So Kewl Guy
C|3R1C's Avatar
48
Rep
619
Posts

Drives: 2010 E93 M3 DCT
Join Date: Sep 2011
Location: Los Angeles

iTrader: (3)

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.
__________________
2010 E93 M3 / MS Catless X-Pipe / AA Catback / Vorsteiner Vented Hood and Bootlid E93 Trunk / ADV1 7.1 Wheels GB / LS3 LED Lights / Harrop Supercharger
Appreciate 0
      02-13-2013, 06:55 PM   #18
CanAutM3
General
CanAutM3's Avatar
Canada
21105
Rep
20,741
Posts

Drives: 2021 911 turbo
Join Date: Jan 2012
Location: Montreal

iTrader: (1)

Garage List
Quote:
Originally Posted by eclause13 View Post
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.
Appreciate 0
      02-15-2013, 08:35 AM   #19
PhoenixRising
Important text here
United_States
24
Rep
130
Posts

Drives: 2013 M3 Conv
Join Date: Dec 2012
Location: Phoenix, AZ

iTrader: (0)

Garage List
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.
__________________

2009 AM V8 Vantage Conv - Berwick Bronze, Quicksilver Exhaust
2013 M3 Conv - (RIP) thanks to uninsured a-hole
2004 Porsche 911 C4S Conv
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 05:44 AM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST