DIY DCT Launch Control (Have I discovered something here?)

Vtec Abuser · 03-07-2012, 04:19 PM

All I can advise guys is that you need to pump the accelerator pedal very fast and hard (to the floor). On occasions it doesn't work for me either, quite bizarre really.

bogart · 03-08-2012, 08:28 AM

Quote:

Originally Posted by Vtec Abuser

All I can advise guys is that you need to pump the accelerator pedal very fast and hard (to the floor). On occasions it doesn't work for me either, quite bizarre really.

Do you push the accelerator all the way down past the kick-down button? Or just before you hit the button?

135iUSN · 03-08-2012, 08:58 AM

Quote:

Originally Posted by Dackelone

fixed it.

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bogart · 03-08-2012, 09:04 AM

Quote:

Originally Posted by 135iUSN

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Looks like there was an error in your post...

Dackelone · 03-08-2012, 10:28 AM

Quote:

Originally Posted by 135iUSN

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That video link works for me. Are you guys still having trouble viewing it>???

http://www.1addicts.com/forums/showthread.php?t=658527

V8Killer · 03-08-2012, 01:07 PM

LMAO...does remind me of Hans

bogart · 03-08-2012, 01:54 PM

Quote:

Originally Posted by V8Killer

LMAO...does remind me of Hans

Huh? lol

Vtec Abuser · 03-09-2012, 11:57 AM

Quote:

Originally Posted by bogart

Do you push the accelerator all the way down past the kick-down button? Or just before you hit the button?

Past it mate - to the floor

131tch · 03-19-2012, 06:18 AM

thats interesting

However one problem, when i switch of my traction completely off i cant keep my vehicle straight my car goes side ways untill i get to third gear

anybody no how to resolve this issue, i dont think its my tyres as they brand new, but with traction half off i get some wheelspin but the car remains straight.

Vtec Abuser · 03-19-2012, 08:24 AM

That is because the stability control is off and will allow the car to behave how it wants.. Will it DSC only half off the stability control will reign things in if the arse end gets out of shape.
Will this technique that I have stumbled upon you can bring the revs right down and launch at lowish revs. This should prevent you getting a tank slapper..

NotNormal · 03-25-2012, 05:12 AM

Quote:

Originally Posted by Vtec Abuser

That is because the stability control is off and will allow the car to behave how it wants.. Will it DSC only half off the stability control will reign things in if the arse end gets out of shape.
Will this technique that I have stumbled upon you can bring the revs right down and launch at lowish revs. This should prevent you getting a tank slapper..

Bens technique, although alittle cumbersome to initiate is effective, demonstrated to me the ther day, it does give a good launch !!

BI2016 · 04-09-2012, 06:29 PM

Hey guys,

Maybe im stating the obvious...but in my 135i dct ( its a 2012, I took delivery a month ago), if you floor the throttle ie activate kickdown from a standing start, the engine revs to 2.5k-3k against the clutch and then lets it out/not quite dumps it.... Whats more, it allows you to feather the throttle for a pretty clean getaway...ive got the PPk installed, so its running more torque than normal ( not as much as my old Procede V4) and it works wonderfully.

Has anyone else noticed this?

bogart · 04-09-2012, 09:39 PM

This won't work when you're running more boost.. all you do is spin the tires.

Aries932 · 04-18-2012, 09:00 AM

Quote:

Originally Posted by BI2016

Hey guys,

Maybe im stating the obvious...but in my 135i dct ( its a 2012, I took delivery a month ago), if you floor the throttle ie activate kickdown from a standing start, the engine revs to 2.5k-3k against the clutch and then lets it out/not quite dumps it.... Whats more, it allows you to feather the throttle for a pretty clean getaway...ive got the PPk installed, so its running more torque than normal ( not as much as my old Procede V4) and it works wonderfully.

Has anyone else noticed this?

Quote:

Originally Posted by bogart

This won't work when you're running more boost.. all you do is spin the tires.

Actually that is not true...basically when you floor the throttle the faster your foot pushes the accelerator from 0-kickdown the higher the revs you get out of that launch.

Also the same applies the slower you push the pedal down the lower amount of revs.

I think all that is happening is are pushing the accelerator down before the car has had a chance to let the clutch out. So whatever amount of revs you get up before that happens is what you launch at.

Time it correctly and I believe you can get anywhere between 1-4k revs.

Vtec Abuser · 04-18-2012, 10:02 AM

It seems to of done the trick either way..

Best of the day was 12.7 @ 111mph. Best before that was 13.0 @ 110mph..

JeremyN55 · 06-22-2012, 05:22 PM

I have a 2012 135i and when i press the DTC button i get the car with skid marks and not the letters DTC. I tried everything and i cant get my launch control to work! Wondering if i need a software update?

alexmtl_135i · 06-23-2012, 01:32 AM

I noticed another DIY Launch Control (the one described here doesn't work on my car although I'm pretty sure I have the latest software). Here is what works for me:

1. Activate launch control, as normal: RPMs will go to 3500
2. Release the throttle a bit, until say 2500RPM
3. Release the brake (first) and floor the throttle (right after).

It actually sounds a bit basic but I've never seen it mentioned on forums and I see a lot of people trying to launch their tuned car with DCT..

That method works fine but it's very hard to get the timing right (at the track or at a traffic light :P). Another trick is that the RPMs can only go down once LC is activated, so if you missed the 2500 sweet spot you cannot press the throttle more to rev it up. Once the RPMs go up again, the LC will disactivate itself.

Quite weird really, but it works. Curious to see if other people can do that as well !

Vtec Abuser · 06-25-2012, 06:24 AM

^^^ This method does work to a certain degree, but the problem I have found with LC is the stability control cuts in once the car gets even slightly out of shape or hits a bump etc in the road..
I find it easier to turn everything off and control the rear end with the throttle..

I was at a sprint event this weekend and managed a best 0-60 of 4.3 using my method..
This is a vid of another run (4.4 0-60 and 12.9 1/4 mile) and as you can see from the vid, the conditions weren't too great..

CrustyNoodle · 06-25-2012, 06:44 AM

Quote:

Originally Posted by Vtec Abuser

^^^ This method does work to a certain degree, but the problem I have found with LC is the stability control cuts in once the car gets even slightly out of shape or hits a bump etc in the road..
I find it easier to turn everything off and control the rear end with the throttle..

I was at a sprint event this weekend and managed a best 0-60 of 4.3 using my method..
This is a vid of another run (4.4 0-60 and 12.9 1/4 mile) and as you can see from the vid, the conditions weren't too great..

Video?

Vtec Abuser · 06-25-2012, 06:50 AM

Click on the image mate.

CrustyNoodle · 06-25-2012, 06:51 AM

Quote:

Originally Posted by Vtec Abuser

Click on the image mate.

Nada! Must be the stupid iPad!

Vtec Abuser · 06-25-2012, 07:09 AM

03-07-2012, 04:19 PM	#23
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)	All I can advise guys is that you need to pump the accelerator pedal very fast and hard (to the floor). On occasions it doesn't work for me either, quite bizarre really.
	Appreciate 0 Quote

03-08-2012, 01:07 PM	#28
V8Killer Private First Class 12 Rep 171 Posts Drives: Alpine White 335i 6MT Join Date: Apr 2009 Location: Omaha,Ne iTrader: (0)	LMAO...does remind me of Hans
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03-19-2012, 06:18 AM	#31
131tch Private First Class 10 Rep 108 Posts Drives: BMW 135i DCT '11 Join Date: Aug 2011 Location: South Africa iTrader: (0) Garage List 2011 BMW 135i [10.00]	thats interesting However one problem, when i switch of my traction completely off i cant keep my vehicle straight my car goes side ways untill i get to third gear anybody no how to resolve this issue, i dont think its my tyres as they brand new, but with traction half off i get some wheelspin but the car remains straight.
	Appreciate 0 Quote

03-19-2012, 08:24 AM	#32
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)	That is because the stability control is off and will allow the car to behave how it wants.. Will it DSC only half off the stability control will reign things in if the arse end gets out of shape. Will this technique that I have stumbled upon you can bring the revs right down and launch at lowish revs. This should prevent you getting a tank slapper..
	Appreciate 0 Quote

04-09-2012, 06:29 PM	#34
BI2016 New Member 1 Rep 17 Posts Drives: 2010 xdrive 40d, 2012 135i dct Join Date: Jan 2008 Location: Australia iTrader: (0)	Hey guys, Maybe im stating the obvious...but in my 135i dct ( its a 2012, I took delivery a month ago), if you floor the throttle ie activate kickdown from a standing start, the engine revs to 2.5k-3k against the clutch and then lets it out/not quite dumps it.... Whats more, it allows you to feather the throttle for a pretty clean getaway...ive got the PPk installed, so its running more torque than normal ( not as much as my old Procede V4) and it works wonderfully. Has anyone else noticed this?
	Appreciate 0 Quote

04-09-2012, 09:39 PM	#35
bogart Lieutenant Colonel 116 Rep 1,664 Posts Drives: E82 N55 DCT Join Date: Nov 2010 Location: STL, MO iTrader: (4) Garage List 2011 BMW 135i [7.06]	This won't work when you're running more boost.. all you do is spin the tires. __________________
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04-18-2012, 10:02 AM	#37
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)	It seems to of done the trick either way.. Best of the day was 12.7 @ 111mph. Best before that was 13.0 @ 110mph..
	Appreciate 0 Quote

06-22-2012, 05:22 PM	#38
JeremyN55 Enlisted Member 7 Rep 34 Posts Drives: 2012 135i Join Date: Feb 2012 Location: San Bernardino,CA iTrader: (0)	I have a 2012 135i and when i press the DTC button i get the car with skid marks and not the letters DTC. I tried everything and i cant get my launch control to work! Wondering if i need a software update?
	Appreciate 0 Quote

06-23-2012, 01:32 AM	#39
alexmtl_135i First Lieutenant 31 Rep 371 Posts Drives: 2013 C63 Coupe P31 Join Date: Oct 2011 Location: Montreal, Canada iTrader: (0)	I noticed another DIY Launch Control (the one described here doesn't work on my car although I'm pretty sure I have the latest software). Here is what works for me: 1. Activate launch control, as normal: RPMs will go to 3500 2. Release the throttle a bit, until say 2500RPM 3. Release the brake (first) and floor the throttle (right after). It actually sounds a bit basic but I've never seen it mentioned on forums and I see a lot of people trying to launch their tuned car with DCT.. That method works fine but it's very hard to get the timing right (at the track or at a traffic light :P). Another trick is that the RPMs can only go down once LC is activated, so if you missed the 2500 sweet spot you cannot press the throttle more to rev it up. Once the RPMs go up again, the LC will disactivate itself. Quite weird really, but it works. Curious to see if other people can do that as well !
	Appreciate 0 Quote

06-25-2012, 06:24 AM	#40
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)	^^^ This method does work to a certain degree, but the problem I have found with LC is the stability control cuts in once the car gets even slightly out of shape or hits a bump etc in the road.. I find it easier to turn everything off and control the rear end with the throttle.. I was at a sprint event this weekend and managed a best 0-60 of 4.3 using my method.. This is a vid of another run (4.4 0-60 and 12.9 1/4 mile) and as you can see from the vid, the conditions weren't too great..
	Appreciate 0 Quote

06-25-2012, 06:50 AM	#42
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)	Click on the image mate.
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06-25-2012, 07:09 AM	#44
Vtec Abuser First Lieutenant 35 Rep 367 Posts Drives: 2012 135i DCT Join Date: Jan 2009 Location: Every-bloody-where.. iTrader: (0)
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