Launch Control?

wildwestm3 · 08-01-2014, 10:13 AM

OK, so I turned off the DSC, EDC, put it in the fastest shift setting, hit the M button and couldn't get the "flag". Then I figured out I couldn't have my foot on the brake. Take foot off the brake, wala...launch control works (fun too). Here is my question. If you can't put your foot on the brake, how do you keep it from rolling forward, say out of the staging lights at the track? I know this isn't a 1/4 mile car, but doesn't seem to make sense that you can't use the brakes in conjunction with launch control. Am I missing something?

wildwestm3 · 08-01-2014, 01:35 PM

80 views and nothing? Guess this feature isn't used much...LOL

Galt? · 08-01-2014, 01:46 PM

In general, DCT cars will not roll until you hit the gas unless you are on a slope. When you launch, you have to press the gas pedal all the way down, then release the shifter from the forward position that you holding and then the car launches. The diagram in the link below is accurate.

http://www.m3post.com/forums/showpos...42&postcount=9

crypticc · 08-01-2014, 03:14 PM

On a rhd car how do you hold gearstick forward while adjusting the launch rpm (also on left side of steering wheel). reach around the steering wheel? Nope. Spare left foot on the gear stick? Nope

Lol

wildwestm3 · 08-01-2014, 03:30 PM

Quote:

Originally Posted by crypticc

On a rhd car how do you hold gearstick forward while adjusting the launch rpm (also on left side of steering wheel). reach around the steering wheel? Nope. Spare left foot on the gear stick? Nope

Lol

?? I put my foot to the floor and it sat at about 5500RPM. Let go of the shifter and was off. Didn't have to adjust anything on the steering wheel...

MFL · 08-01-2014, 04:55 PM

Once you get LC engaged you can lightly actuate the brake to stop it from moving forward.

MFL · 08-01-2014, 04:55 PM

Also, you can lower your launch RPM with your cruise control selector.

bdaddylo · 08-01-2014, 05:33 PM

Quote:

Originally Posted by wildwestm3

?? I put my foot to the floor and it sat at about 5500RPM. Let go of the shifter and was off. Didn't have to adjust anything on the steering wheel...

crypticc lives in the UK and drives a right hand drive, RHD, M3. The launch rpm can be adjusted by using the cruise controls stalk. Most believe the default launch rpm of 5,500 is too high, which creates a problem for those who own RHD M3s.

crypticc · 08-01-2014, 06:22 PM

Quote:

Originally Posted by bdaddylo

crypticc lives in the UK and drives a right hand drive, RHD, M3. The launch rpm can be adjusted by using the cruise controls stalk. Most believe the default launch rpm of 5,500 is too high, which creates a problem for those who own RHD M3s.

It's the reason I've not tried this

wildwestm3 · 08-01-2014, 08:16 PM

Ah, didn't realize you could adjust the launch rpm that way. Learning more and more every day about this car. Love the technology. I'm auto crossing it tomorrow, so all this will come in handy. Really looking forward to putting it through some paces. Won't be able to use the power on an autox course, but it will be fun just the same...

Boo-E · 08-01-2014, 11:23 PM

I found out LC on a supercharged car is useless hahah. Immediately went sideways

Patrón · 08-02-2014, 12:18 AM

Can someone with full bolt-ons recommend a good rpm to set it at?

crypticc · 08-02-2014, 12:46 PM

Quote:

Originally Posted by Boo-E

I found out LC on a supercharged car is useless hahah. Immediately went sideways

Isn't one of the flashable parameters coefficient of friction for TC?

Meaning your car currently "thinks" it develops less torque than it actually does. And if that coefficient was adjusted it might compensate

Boo-E · 08-02-2014, 03:56 PM

Quote:

Originally Posted by crypticc

Quote:

Originally Posted by Boo-E

I found out LC on a supercharged car is useless hahah. Immediately went sideways

Isn't one of the flashable parameters coefficient of friction for TC?

Meaning your car currently "thinks" it develops less torque than it actually does. And if that coefficient was adjusted it might compensate

Not sure. When I get a chance I'll test LC again at a lower rpm. I'm assuming I tried it at the default 5500.

Amirsm3 · 08-02-2014, 04:00 PM

Quote:

Originally Posted by Boo-E

I found out LC on a supercharged car is useless hahah. Immediately went sideways

I bet it was tons of fun, though.

quicktwinturbo · 08-02-2014, 04:07 PM

Correct me if i'm wrong but LC puts a lot of stress on DCT...fyi..

Boo-E · 08-02-2014, 04:10 PM

Quote:

Originally Posted by quicktwinturbo

Correct me if i'm wrong but LC puts a lot of stress on DCT...fyi..

So does a supercharger...what's your point hahaha.

quicktwinturbo · 08-02-2014, 04:59 PM

Quote:

Originally Posted by Boo-E

So does a supercharger...what's your point hahaha.

Keep on doing it.. It's your car afterall.. Just don't want to see a DCT failure thread due to overusage of LC.

M3-S65 · 08-02-2014, 09:50 PM

Didn't most of the reviews find that they could launch the car faster without the LC...??

Edward · 08-04-2014, 03:13 PM

What this car has shouldn't be called launch control. It should be called burnout mode. Using launch control does not effectively minimize wheel slip to put down only the power the tires can handle until the car is up to speed like real launch control on GT-R's and other exotics.

It just lets you sit there and burn out to no end. 9/10 times you'll probably launch slower by using LC.

The best thing you can do is set suspension to soft to allow the tiniest bit of extra squat which equates to increased rear tire traction, stay in D5 mode with power button on and either mash the throttle or very quickly accelerate your foot down to allow the dct clutch to modulate itself properly. That tiny bit of lag you get when smashing down the pedal always seems to cause me to automatically lose half a car length right from the get go....a killer if you're only trying to street light race someone up to 50 mph or less.

Dougeefresh · 08-04-2014, 05:39 PM

Quote:

Originally Posted by Edward

What this car has shouldn't be called launch control. It should be called burnout mode. Using launch control does not effectively minimize wheel slip to put down only the power the tires can handle until the car is up to speed like real launch control on GT-R's and other exotics.

It just lets you sit there and burn out to no end. 9/10 times you'll probably launch slower by using LC.

The best thing you can do is set suspension to soft to allow the tiniest bit of extra squat which equates to increased rear tire traction, stay in D5 mode with power button on and either mash the throttle or very quickly accelerate your foot down to allow the dct clutch to modulate itself properly. That tiny bit of lag you get when smashing down the pedal always seems to cause me to automatically lose half a car length right from the get go....a killer if you're only trying to street light race someone up to 50 mph or less.

Because you are not doing it right. This is why you change the launch RPM with the cruise stalk. I can launch perfectly using LC with 3500-4000, no burn out but a chirp and then go.

M3GarageKing · 08-04-2014, 06:37 PM

I can launch perfectly using LC @ 5500 RPM DCT with stock tires- no burn out

08-01-2014, 10:13 AM	#1
wildwestm3 Captain 217 Rep 692 Posts Drives: 2008 M3 Convertible Join Date: May 2014 Location: Springboro OH iTrader: (2)	Launch Control? OK, so I turned off the DSC, EDC, put it in the fastest shift setting, hit the M button and couldn't get the "flag". Then I figured out I couldn't have my foot on the brake. Take foot off the brake, wala...launch control works (fun too). Here is my question. If you can't put your foot on the brake, how do you keep it from rolling forward, say out of the staging lights at the track? I know this isn't a 1/4 mile car, but doesn't seem to make sense that you can't use the brakes in conjunction with launch control. Am I missing something? __________________ Thanks, Dave [SIGPIC][/SIGPIC]
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08-01-2014, 01:35 PM	#2
wildwestm3 Captain 217 Rep 692 Posts Drives: 2008 M3 Convertible Join Date: May 2014 Location: Springboro OH iTrader: (2)	80 views and nothing? Guess this feature isn't used much...LOL __________________ Thanks, Dave [SIGPIC][/SIGPIC]
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08-01-2014, 01:46 PM	#3
Galt? Shrug 1 Rep 65 Posts Drives: '11 E90 M3, AW/FR, ZCP Join Date: Apr 2014 Location: Philadelphia, PA iTrader: (0)	In general, DCT cars will not roll until you hit the gas unless you are on a slope. When you launch, you have to press the gas pedal all the way down, then release the shifter from the forward position that you holding and then the car launches. The diagram in the link below is accurate. http://www.m3post.com/forums/showpos...42&postcount=9 Last edited by Galt?; 08-01-2014 at 01:50 PM.. Reason: accuracy!
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08-01-2014, 03:14 PM	#4
crypticc Captain 78 Rep 966 Posts Drives: e92 M3 DCT + Comp Join Date: Dec 2011 Location: London, UK iTrader: (0)	On a rhd car how do you hold gearstick forward while adjusting the launch rpm (also on left side of steering wheel). reach around the steering wheel? Nope. Spare left foot on the gear stick? Nope Lol
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08-01-2014, 04:55 PM	#6
MFL Major 174 Rep 1,246 Posts Drives: E92 M3 Join Date: Sep 2013 Location: Bellevue, WA iTrader: (3) Garage List 2010 BMW M3 [9.00]	Once you get LC engaged you can lightly actuate the brake to stop it from moving forward.
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08-01-2014, 08:16 PM	#10
wildwestm3 Captain 217 Rep 692 Posts Drives: 2008 M3 Convertible Join Date: May 2014 Location: Springboro OH iTrader: (2)	Ah, didn't realize you could adjust the launch rpm that way. Learning more and more every day about this car. Love the technology. I'm auto crossing it tomorrow, so all this will come in handy. Really looking forward to putting it through some paces. Won't be able to use the power on an autox course, but it will be fun just the same... __________________ Thanks, Dave [SIGPIC][/SIGPIC]
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08-01-2014, 11:23 PM	#11
Boo-E Lieutenant Colonel 134 Rep 1,577 Posts Drives: 2011.75 E90 M3 ZCP DCT AW Join Date: Jul 2013 Location: San Francisco iTrader: (3)	I found out LC on a supercharged car is useless hahah. Immediately went sideways __________________ 2011.75 E90 ZCP DCT AW OEM CF splitters, mirror, and spoiler. Feeling so stock right about now.
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08-02-2014, 12:18 AM	#12
Patrón PAZUZU 545 Rep 2,058 Posts Drives: '15 M4 Join Date: Sep 2013 Location: San Antonio, TX iTrader: (1) Garage List 2015 BMW M4 [0.00] 2009 BMW M3 [10.00]	Can someone with full bolt-ons recommend a good rpm to set it at?
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08-02-2014, 04:07 PM	#16
quicktwinturbo Lieutenant 33 Rep 547 Posts Drives: Limited Ed Toyota Camry Join Date: Oct 2010 Location: IL, AL, ATL, SC iTrader: (2)	Correct me if i'm wrong but LC puts a lot of stress on DCT...fyi..
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08-02-2014, 09:50 PM	#19
M3-S65 Banned 43 Rep 881 Posts Drives: M3 Join Date: Dec 2013 Location: USA iTrader: (6)	Didn't most of the reviews find that they could launch the car faster without the LC...??
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08-04-2014, 03:13 PM	#20
Edward Colonel 377 Rep 2,982 Posts Drives: 2013.9999 E92 Jerez ZCP Join Date: May 2010 Location: Los Angeles iTrader: (2)	What this car has shouldn't be called launch control. It should be called burnout mode. Using launch control does not effectively minimize wheel slip to put down only the power the tires can handle until the car is up to speed like real launch control on GT-R's and other exotics. It just lets you sit there and burn out to no end. 9/10 times you'll probably launch slower by using LC. The best thing you can do is set suspension to soft to allow the tiniest bit of extra squat which equates to increased rear tire traction, stay in D5 mode with power button on and either mash the throttle or very quickly accelerate your foot down to allow the dct clutch to modulate itself properly. That tiny bit of lag you get when smashing down the pedal always seems to cause me to automatically lose half a car length right from the get go....a killer if you're only trying to street light race someone up to 50 mph or less.
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08-04-2014, 06:37 PM	#22
M3GarageKing Private First Class 5 Rep 119 Posts Drives: E93#DTC Lexus IS350 Fsport DD Join Date: Jul 2014 Location: LA iTrader: (4)	I can launch perfectly using LC @ 5500 RPM DCT with stock tires- no burn out
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