335i DCT Launch Control with V3

Dougie335 · 04-29-2009, 03:32 PM

See here:

http://www.e90post.com/forums/showthread.php?t=256821

Fun to play with

OpenFlash · 04-29-2009, 03:34 PM

Love it!

Sniz · 04-29-2009, 03:39 PM

looks like fun...cant believe its designed to launch at 5k rpms!!!!

I couldnt get traction w/ anything higher than a 3k feathered clutch launch on the street.

Dougie335 · 04-29-2009, 03:50 PM

Sniz,
Seems to hold some traction until it gets to 20 mph and then its loses it. Only just started to play with it so will take a more detailed look at in the future to see exactly whats happening.

Dougie.

to_riffic · 04-29-2009, 04:23 PM

damn, i didn't kno there was a tru launch control feature. only on dct 335i?

Dougie335 · 04-29-2009, 04:25 PM

ra2fanatic,

Only available on DCT version.

to_riffic · 04-29-2009, 04:57 PM

Quote:

Originally Posted by Dougie335

ra2fanatic,

Only available on DCT version.

damn....thats awesome. i wish the US had this option already.

Mahhvinn · 04-29-2009, 10:05 PM

Quote:

Originally Posted by ra2fanatic

damn....thats awesome. i wish the US had this option already.

Septro · 04-29-2009, 10:12 PM

Launch control with a 335 is called an XI. Don't see the news here.

Driver72 · 04-29-2009, 10:40 PM

Quote:

Originally Posted by Sniz

looks like fun...cant believe its designed to launch at 5k rpms!!!!

I couldnt get traction w/ anything higher than a 3k feathered clutch launch on the street.

Not sure what the point of them doing that is.
You can clearly hear the car rev up, then it bogs down upon launch as the ECU pulls back the power, then it releases the power a bit, allowing too much wheelspin, then because of that it pulls to much power and bogs briefly again, then it finally takes off.
I don't see how this "launch control" is beneficial in attaining optimum acceleration.
You'd be much better off just brake boosting it yourself and learning to press the pedal down quickly and smoothly to get the best launch with a tiny bit of wheelspin at the start and then the tires just on the edge of breaking loose.
But then, I'm not sure if DCT tranny allows the brake boosting.

But good to see it can take the power of a tuned 335i

Devin · 04-30-2009, 03:25 PM

Quote:

Originally Posted by Septro

Launch control with a 335 is called an XI. Don't see the news here.

lol i want a 335xi with DCT =)

Dougie335 · 04-30-2009, 03:48 PM

Here’s some data from non and launch control launches. The launch control launches are from the video’s. Hopefully there of some interest as you can actually see what’s happening.

Driver72 · 05-01-2009, 05:23 AM

Seems I was right on target with my suspicions and thoughts about LC acceleration results.

Graph #3 is a thing of beauty and as it should be with no launch control and a perfectly executed driver applied acceleration run.
Nice smooth throttle application (up to the point where it looks as if the driver let up off the throttle) and nice smooth acceleration increase to match.

Then with launch control, as I suspected based on the sound of the engine during that video.... Erratic rpm bouncing up and down too much and therefore erratic acceleration, resulting in much slower acceleration times.

Interesting, thanks.

BTW, by chance do you have the gear ratios for the DCT as well as the final drive ratio?

sflgator · 05-01-2009, 07:10 AM

So, the LC on the 335i DCT actually makes it slower than if brake launching?

If so, then what's the point of the LC then and why did BMW incorporate it with the DCT tranny? Is the BMW E90/92 M3 DCT slower when the LC is engaged as well?

Sniz · 05-01-2009, 07:37 AM

you guys might find this of interest.

2010 corvette with launch control explained by GM....I want this car!

http://www.e90post.com/forums/showthread.php?t=256594

gqmd · 05-01-2009, 07:40 AM

Wow...also noticed how high of an RPM it is using...

Driver72 · 05-01-2009, 12:15 PM

Now that's a launch control with that Vette.
It should equal if not better the best a driver can do with modulating the throttle, and that in fact is exactly what it did.

As usual though, it's yet another step to taking away any skill a driver needs these days.

Can you imagine the younger kids now who've only grown up driving cars with launch control, stability control, and all that jumping into a performance car from 10 years ago and seeing how well they can do at a track (straight or curvy). We could take bets as to how quickly they'd be in the run offs.

Wonder what GM will be selling the 2010 Vettes for now that they are desperate for money.
$2k under invoice maybe?

KWY91 · 05-01-2009, 12:46 PM

It's awesome, tried it twice alr! WIN!

04-29-2009, 03:32 PM	#1
Dougie335 Private First Class 29 Rep 188 Posts Drives: Audi S5 Join Date: Jan 2008 Location: Glasgow iTrader: (0)	335i DCT Launch Control with V3 See here: http://www.e90post.com/forums/showthread.php?t=256821 Fun to play with
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04-29-2009, 03:34 PM	#2
OpenFlash 1736 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	Love it!
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04-29-2009, 03:39 PM	#3
Sniz Lieutenant General 654 Rep 10,587 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	looks like fun...cant believe its designed to launch at 5k rpms!!!! I couldnt get traction w/ anything higher than a 3k feathered clutch launch on the street. __________________
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04-29-2009, 03:50 PM	#4
Dougie335 Private First Class 29 Rep 188 Posts Drives: Audi S5 Join Date: Jan 2008 Location: Glasgow iTrader: (0)	Sniz, Seems to hold some traction until it gets to 20 mph and then its loses it. Only just started to play with it so will take a more detailed look at in the future to see exactly whats happening. Dougie.
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04-29-2009, 04:23 PM	#5
to_riffic Lieutenant General 3024 Rep 13,763 Posts Drives: rwd Join Date: Feb 2008 Location: SoCal iTrader: (38)	damn, i didn't kno there was a tru launch control feature. only on dct 335i? __________________ ~loud noises~
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04-29-2009, 04:25 PM	#6
Dougie335 Private First Class 29 Rep 188 Posts Drives: Audi S5 Join Date: Jan 2008 Location: Glasgow iTrader: (0)	ra2fanatic, Only available on DCT version.
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04-29-2009, 10:12 PM	#9
Septro Banned 77 Rep 1,649 Posts Drives: '08 e90 335xi Join Date: Jun 2008 Location: C-Bus, OH iTrader: (1)	Launch control with a 335 is called an XI. Don't see the news here.
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04-30-2009, 03:48 PM	#12
Dougie335 Private First Class 29 Rep 188 Posts Drives: Audi S5 Join Date: Jan 2008 Location: Glasgow iTrader: (0)	Here’s some data from non and launch control launches. The launch control launches are from the video’s. Hopefully there of some interest as you can actually see what’s happening. Attached Images
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05-01-2009, 05:23 AM	#13
Driver72 Brigadier General 327 Rep 4,484 Posts Drives: 335i - to new owners now. Join Date: Dec 2006 Location: California iTrader: (0)	Seems I was right on target with my suspicions and thoughts about LC acceleration results. Graph #3 is a thing of beauty and as it should be with no launch control and a perfectly executed driver applied acceleration run. Nice smooth throttle application (up to the point where it looks as if the driver let up off the throttle) and nice smooth acceleration increase to match. Then with launch control, as I suspected based on the sound of the engine during that video.... Erratic rpm bouncing up and down too much and therefore erratic acceleration, resulting in much slower acceleration times. Interesting, thanks. BTW, by chance do you have the gear ratios for the DCT as well as the final drive ratio?
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05-01-2009, 07:10 AM	#14
sflgator Major General 148 Rep 5,389 Posts Drives: '09 MB C63 AMG & '08 MB GL450 Join Date: Oct 2006 Location: U.S. iTrader: (1)	So, the LC on the 335i DCT actually makes it slower than if brake launching? If so, then what's the point of the LC then and why did BMW incorporate it with the DCT tranny? Is the BMW E90/92 M3 DCT slower when the LC is engaged as well? __________________ \|2009 RENNtech MB C63 AMG \| Black/Black Leather/Black Maple \| Premium II \| MultiMedia \| iPod \| \| TeleAid \| Charcoal Filter Delete \| BMC High-Flow Air Filters \| High-Flow Secondary Cats \| Clear Side Markers \|
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05-01-2009, 07:37 AM	#15
Sniz Lieutenant General 654 Rep 10,587 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	you guys might find this of interest. 2010 corvette with launch control explained by GM....I want this car! http://www.e90post.com/forums/showthread.php?t=256594 __________________
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05-01-2009, 07:40 AM	#16
gqmd Chemo Doc 9 Rep 470 Posts Drives: e92 335i 6MT Join Date: Jun 2006 Location: Maryland/DC iTrader: (0)	Wow...also noticed how high of an RPM it is using... __________________ jet black 335i, 6MT manual, black interior with silver aluminum trim, PP, SP.
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05-01-2009, 12:15 PM	#17
Driver72 Brigadier General 327 Rep 4,484 Posts Drives: 335i - to new owners now. Join Date: Dec 2006 Location: California iTrader: (0)	Now that's a launch control with that Vette. It should equal if not better the best a driver can do with modulating the throttle, and that in fact is exactly what it did. As usual though, it's yet another step to taking away any skill a driver needs these days. Can you imagine the younger kids now who've only grown up driving cars with launch control, stability control, and all that jumping into a performance car from 10 years ago and seeing how well they can do at a track (straight or curvy). We could take bets as to how quickly they'd be in the run offs. Wonder what GM will be selling the 2010 Vettes for now that they are desperate for money. $2k under invoice maybe?
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05-01-2009, 12:46 PM	#18
KWY91 Major 36 Rep 1,297 Posts Drives: 2015 BMW M3 (on order), 458 Join Date: Sep 2008 Location: Exeter, Devon iTrader: (3)	It's awesome, tried it twice alr! WIN!
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