Launch Control Fail... :(

JCtx · 05-29-2011, 07:23 PM

I don't have DCT, but why did you turn DSC off

? Leave it on man. Wheelspin doesn't launch you any quicker. Launch control is supposed to just add enough wheelspin for an optimal launch; turning DSC off shouldn't be needed, as it might save a car turning sideways. I doubt BMW didn't take that into consideration. Try it.

geneatals · 05-29-2011, 07:33 PM

Quote:

Originally Posted by elp_jc

I don't have DCT, but why did you turn DSC off

? Leave it on man. Wheelspin doesn't launch you any quicker. Launch control is supposed to just add enough wheelspin for an optimal launch; turning DSC off shouldn't be needed, as it might save a car turning sideways. I doubt BMW didn't take that into consideration. Try it.

dsc needs to be turned off in order to get to S6...

donovan · 05-29-2011, 11:42 PM

...this is how you break your new 70k m3...

OC3 · 05-30-2011, 04:37 AM

Holy sh*t, that sounds bad. It should've went something like this...

MRSSIIM3 · 05-30-2011, 04:44 AM

tried it again tonight...this time sport in comfort and rpms at 4k...same result

could it be my tires? too much grip? why is wheel hop happening exactly?

sameh · 05-30-2011, 07:47 AM

Quote:

Originally Posted by hamama3

tried it again tonight...this time sport in comfort and rpms at 4k...same result

could it be my tires? too much grip? why is wheel hop happening exactly?

How about when you floor your car on MDM, what happens? do you get a good launch?

Sandye90m3 · 05-30-2011, 11:22 AM

I just don't like using launch control. I've done it three times in the past 2.5 years. One of the times was actually last week!! It was very fun and the car turns into a bigger beast, but I just don't like the feeling of dumping the clutch at 4500 rpm or whatever it is. I'll never do it again, unless my dad wants to see what it is.

MRSSIIM3 · 05-30-2011, 12:19 PM

Quote:

Originally Posted by sameh

How about when you floor your car on MDM, what happens? do you get a good launch?

thats the weird part, if i do just floor it past the click in MDM, the rpms will jump to 4k and itll take off and itll be a perfect launch, no wheelspin, no dsc intervention, no wheel hop

then on the flipside, if DSC off and i floor it, theres no wheelhop, the wheels just spin and i do a massive burnout

what confuses me is why launch control all of a sudden causes wheel hop. if anything, shouldnt it be similar to dsc off flooring and just do a burnout?

sameh · 05-30-2011, 12:26 PM

Quote:

Originally Posted by hamama3

Quote:

Originally Posted by sameh

How about when you floor your car on MDM, what happens? do you get a good launch?

thats the weird part, if i do just floor it past the click in MDM, the rpms will jump to 4k and itll take off and itll be a perfect launch, no wheelspin, no dsc intervention, no wheel hop

then on the flipside, if DSC off and i floor it, theres no wheelhop, the wheels just spin and i do a massive burnout

what confuses me is why launch control all of a sudden causes wheel hop. if anything, shouldnt it be similar to dsc off flooring and just do a burnout?

Hmmm. Something is not right here. May be your LC software needs some "refreshing". To be honest, since you'll be using LC very rarely if any (it's not practical for on-the-spot take off). as long as flooring it in MDM and DSC-off work fine, I'd just let it go and may be try it again after one of those routine flash softwears that BMW give us every now and then.

MRSSIIM3 · 05-30-2011, 12:34 PM

Quote:

Originally Posted by sameh

Hmmm. Something is not right here. May be your LC software needs some "refreshing". To be honest, since you'll be using LC very rarely if any (it's not practical for on-the-spot take off). as long as flooring it in MDM and DSC-off work fine, I'd just let it go and may be try it again after one of those routine flash softwears that BMW give us every now and then.

i think thats just what im going to do. to be honest, i never even planned on using it more than a few times, its just a bummer that i held out for 7k miles thinking it would be some spectacular thing that just turned into my differential bouncing a few times

im having other issues with the car as seen here: http://www.m3post.com/forums/showthr...=375751&page=2

maybe if this persists and i take it in for that, ill have them do a launch too to see what the deal is with that. waahhh poor m3 she was perfect up until 2 days ago

JCtx · 05-30-2011, 01:08 PM

Quote:

Originally Posted by hamama3

thats the weird part, if i do just floor it past the click in MDM, the rpms will jump to 4k and itll take off and itll be a perfect launch, no wheelspin, no dsc intervention, no wheel hop

Why don't you just do that instead

? With several differential bolts breaking off on these cars, I honestly wouldn't keep experimenting.

Quote:

Originally Posted by geneatals

dsc needs to be turned off in order to get to S6...

Thanks for the heads up man. Learned something new today

.

MRSSIIM3 · 05-30-2011, 01:23 PM

Quote:

Originally Posted by elp_jc

Why don't you just do that instead

? With several differential bolts breaking off on these cars, I honestly wouldn't keep experimenting.

Thanks for the heads up man. Learned something new today

.

because LC is EPIC!...jk yeah thats what ill do from now on hahaha

gthal · 05-30-2011, 08:55 PM

Quote:

Originally Posted by PKL

DCT

You are a broken record

Yes, we know which transmission you prefer.

donovan · 05-31-2011, 12:11 AM

Some people arent happy until something breaks...

MRSSIIM3 · 05-31-2011, 12:39 AM

Quote:

Originally Posted by donovan

Some people arent happy until something breaks...

what broke?

spdy330 · 05-31-2011, 08:58 AM

I do not think they are saying you broke something. I think they are saying that if you keep trying this that something is bound to break. I know the feeling OP that you just want to get one sucessful run on this. I also believe your driving habits are beign recorded on the onboard computer but I could be wrong on this statement.

Quote:

Originally Posted by hamama3

what broke?

benzo23 · 05-31-2011, 09:20 AM

Forget all this launch control bullshit, just get in the thing and stomp the gas! lol

mkoesel · 05-31-2011, 10:32 AM

Quote:

Originally Posted by hamama3

what confuses me is why launch control all of a sudden causes wheel hop. if anything, shouldnt it be similar to dsc off flooring and just do a burnout?

In theory it should actually be better than that since LC supposedly has its own DSC routine that minimizes spin, whereas just mashing the gas with DSC OFF you are basically getting no help from DSC at all. In practice, though, it doesn't necessarily play out like that. It isn't clear why. I think sameh's theory might hold some water - that some versions of the software "broke" DSC. It could also be road surface, temperature, tire temp, etc, assuming you are not trying these experiments back to back from the exact same spot.

But generally speaking, it seems that BMW's launch control just isn't necessarily that good. I mean, it technically works - it allows you to launch the car from a high RPM, but many folks find that just mashing the gas in MDM mode (not so much DSC OFF, though that of course will work too) yields better results.

I'll say that it works pretty good for me. At the drag strip, I got my best results using LC, and when I use it on the street I don't typically get any hop. Of course I have an E93 which is heavier than a coupe, and I also don't have EDC nor MDM (no MDrive). So that's a lot of variables that could explain why I have more success than others.

MRSSIIM3 · 06-02-2011, 12:50 AM

UPDATE: took car in for service, turns out there was a software update which addressed launch control specifically. dont know which revision or what not. tried it today and

OC3 · 06-02-2011, 12:56 AM

Nice

Nelrock · 06-02-2011, 06:46 AM

Quote:

Originally Posted by hamama3

UPDATE: took car in for service, turns out there was a software update which addressed launch control specifically. dont know which revision or what not. tried it today and

05-29-2011, 07:23 PM	#23
JCtx Major General 258 Rep 5,012 Posts Drives: No BMW yet Join Date: May 2008 Location: El Paso TX iTrader: (0)	I don't have DCT, but why did you turn DSC off ? Leave it on man. Wheelspin doesn't launch you any quicker. Launch control is supposed to just add enough wheelspin for an optimal launch; turning DSC off shouldn't be needed, as it might save a car turning sideways. I doubt BMW didn't take that into consideration. Try it.
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05-29-2011, 11:42 PM	#25
donovan Brigadier General 371 Rep 4,167 Posts Drives: R8 - Ford Raptor Join Date: Aug 2008 Location: National iTrader: (17)	...this is how you break your new 70k m3... __________________ Audi R8 v10 Ford Raptor m3e46freak@yahoo.comfor all euro parts!! ebay/craigslist verified/ m3post/e46fanantics/m3forum/zpost/bimmerforum
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05-30-2011, 04:37 AM	#26
OC3 Havin' a blast! 125 Rep 4,847 Posts Drives: 2013 M3 E92 Jerez Blk DCT ZCP Join Date: Nov 2010 Location: SoCal iTrader: (1)	Holy sh*t, that sounds bad. It should've went something like this... __________________ BRP 1:56 \| CVR 2:01 \| ACS 1:53 \| WSIR 1:34
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05-30-2011, 04:44 AM	#27
MRSSIIM3 General 149 Rep 1,348 Posts Drives: M4 SO Join Date: Apr 2009 Location: NY iTrader: (5)	tried it again tonight...this time sport in comfort and rpms at 4k...same result could it be my tires? too much grip? why is wheel hop happening exactly?
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05-30-2011, 11:22 AM	#29
Sandye90m3 Major 167 Rep 1,159 Posts Drives: M3 Join Date: Oct 2009 Location: Calgary, CA iTrader: (0)	I just don't like using launch control. I've done it three times in the past 2.5 years. One of the times was actually last week!! It was very fun and the car turns into a bigger beast, but I just don't like the feeling of dumping the clutch at 4500 rpm or whatever it is. I'll never do it again, unless my dad wants to see what it is. __________________ M3.E90 JZB *Coded.GTSDCT.BomizValved.TurnerTestPipes.ResDelete .EurochargedTune.AAFilter.HRER40s*
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05-31-2011, 12:11 AM	#36
donovan Brigadier General 371 Rep 4,167 Posts Drives: R8 - Ford Raptor Join Date: Aug 2008 Location: National iTrader: (17)	Some people arent happy until something breaks... __________________ Audi R8 v10 Ford Raptor m3e46freak@yahoo.comfor all euro parts!! ebay/craigslist verified/ m3post/e46fanantics/m3forum/zpost/bimmerforum
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05-31-2011, 09:20 AM	#39
benzo23 Colonel 74 Rep 2,848 Posts Drives: 14 F30 AW MSport Join Date: Apr 2010 Location: FL iTrader: (1)	Forget all this launch control bullshit, just get in the thing and stomp the gas! lol
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06-02-2011, 12:50 AM	#41
MRSSIIM3 General 149 Rep 1,348 Posts Drives: M4 SO Join Date: Apr 2009 Location: NY iTrader: (5)	UPDATE: took car in for service, turns out there was a software update which addressed launch control specifically. dont know which revision or what not. tried it today and
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06-02-2011, 12:56 AM	#42
OC3 Havin' a blast! 125 Rep 4,847 Posts Drives: 2013 M3 E92 Jerez Blk DCT ZCP Join Date: Nov 2010 Location: SoCal iTrader: (1)	Nice __________________ BRP 1:56 \| CVR 2:01 \| ACS 1:53 \| WSIR 1:34
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