What is the point of launch controll?

[///Matthew]

Mine creeped a lot in this vid...

[HighandDry]

Originally Posted by SEI

because its boring as hell... the car is driving you not you driving it... after the first 2 months of being amazed by the accleration its really a soulless machine.. i dont like it..

i like having traction off on a rwd car going sideways into a wall.. you heart just pumps like mad..

Funny. The fastest car I had was the Turbo, but it was also the least enjoyable for me.

[Nordstat]

Using LC with my mods (including a lowered rpm limit for the LC from the tune), I just sit still and make a lot of smoke. Only way I get traction is full M mode and mash the throttle...The thing takes off like a rocket. I actually beat a CLS63 P31 to about 70!

The engine and DCT tunes together work to disallow slipping of the clutch when flooring the throttle, which is the primary reason for using LC instead of mashing.

[CanAutM3]

Originally Posted by ///Matthew

Mine creeped a lot in this vid...

Something seems to be off in this vid if you were using launch control...

[///Matthew]

Originally Posted by CanAutM3

Something seems to be off in this vid if you were using launch control...

Would you like me to post the in-car video that I took while the exterior was shot?

[CanAutM3]

Originally Posted by ///Matthew

Would you like me to post the in-car video that I took while the exterior was shot?

Would be interesting. You seem to be getting a lot of wheel spin with the engine bouncing off the limiter. Perhaps the surface you were on did not have much grip.

When I use LC, it is a rather smooth experience (besides to violent acceleration that is ). Nicely controled clutch/wheel spin with the engine hovering around 8000RPM until the tires grip; quickly followed by an automatic shift to second gear.

On the occasions the grip was not good, the car would hit redline and shift in second gear before the tires had hooked up. The engine would then bog down, not bounce off the limiter as you experienced.

During the LC sequence, if you lift your right foot ever so slightly and release the kickdown button, the car will go out of launch mode.

[CanAutM3]

Something to think about:

I am trying to theorize on what could cause the creep. Since the DCT has wet clutches, could it be possible that the drag in the transmission fluid between the clutch components is transmitting forces despite the clutch being disengaged? Sort of like an inneficient torque converter.

Thoughts?

[///Matthew]

Originally Posted by CanAutM3

Would be interesting. You seem to be getting a lot of wheel spin with the engine bouncing off the limiter. Perhaps the surface you were on did not have much grip.

When I use LC, it is a rather smooth experience (besides to violent acceleration that is ). Nicely controled clutch/wheel spin with the engine hovering around 8000RPM until the tires grip; quickly followed by an automatic shift to second gear.

On the occasions the grip was not good, the car would hit redline and shift in second gear before the tires had hooked up. The engine would then bog down, not bounce off the limiter as you experienced.

During the LC sequence, if you lift your right foot ever so slightly and release the kickdown button, the car will go out of launch mode.

Exactly, the surface had a decent amount of sand on it which severely limited my traction. Other attempts at a different location yielded far superior launches.

In-Car:

GoPro Hero2 on rear bumper:

[BMRLVR]

Originally Posted by CanAutM3

Something to think about:

I am trying to theorize on what could cause the creep. Since the DCT has wet clutches, could it be possible that the drag in the transmission fluid between the clutch components is transmitting forces despite the clutch being disengaged? Sort of like an inneficient torque converter.

Thoughts?

It is possible that there may be some movement transferred through the fluid for sure!

[jfreisen1]

Hi,
I'm knew to the posting.
I drive 2011 Competition package, DCT.
I have only launched my car once with the standard flag on the dash. Its a waste of time. The car spins the wheels to easily. Putting the car in the standard race modes, but letting off the DCT settings to 4 lights. The car will launch faster and with a little clutch slip to keep the launch controllable. With hoosier R6 I ran in flag mode, 1/4 mile 13.6 sec. in level 4 DCT 13.1 sec. 1/2 sec faster and way less wheel spin.
Funny, never tried dragging the car since, its built to go round and round.
Good luck
john

[SVH]

I've had no problem with LC, even when I had a ESS VT2-600. Got a 0-60 in 3.71 according to the P3. Have not had the chance to do LC yet with the VT2-650 as the tires just spin in the cold weather. Also the added weight of the E93 helped get traction. It was actually almost a perfect balance of weight and power....

[SEI]

Originally Posted by SVH

I've had no problem with LC, even when I had a ESS VT2-600. Got a 0-60 in 3.71 according to the P3. Have not had the chance to do LC yet with the VT2-650 as the tires just spin in the cold weather. Also the added weight of the E93 helped get traction. It was actually almost a perfect balance of weight and power....

we arent talking about hooking up traction wise.. thats all dependent on your mods...

we are just saying the launch controll creeps forward when the flag comes up.. i also have a vt2-600 and have traction from 1st gear but that's not the issue here.

[Bel-Tirid]

if u use LC, u also need a drive controll. LC makes me sick, no one needs it

[SVH]

Just saying I "had no problem with it". One can derive what you want from there.....

[abitrandom]

My car doesn't go on launch control.. The flag comes up on the dashboard and it all it does it rev but doesn't launch. I followed every instructional video on this but to no avail.

Will remain a mystery to me..

[guess2098]

Originally Posted by abitrandom

My car doesn't go on launch control.. The flag comes up on the dashboard and it all it does it rev but doesn't launch. I followed every instructional video on this but to no avail.

Will remain a mystery to me..

same thing happens to me but even worse. it goes to LC mode but rev not at 5k, it is at 8.3k (red) and car goes when i release it. pretty crazy and i tried few times and even showed it to friends. they all think my LC mode has problem....

[SEI]

Originally Posted by guess2098

same thing happens to me but even worse. it goes to LC mode but rev not at 5k, it is at 8.3k (red) and car goes when i release it. pretty crazy and i tried few times and even showed it to friends. they all think my LC mode has problem....

Originally Posted by abitrandom

My car doesn't go on launch control.. The flag comes up on the dashboard and it all it does it rev but doesn't launch. I followed every instructional video on this but to no avail.

Will remain a mystery to me..

you both need to go to the dealership...

on a side note.. you both have the exact opposite of each other's problems haha!

[guess2098]

Originally Posted by SEI

you both need to go to the dealership...

on a side note.. you both have the exact opposite of each other's problems haha!

sold my m3 already. but other than the LC, change to 305 PS2 rear helps a lot. set on D5 DSC off and floor the gas, v-box 3.9 sec FBO without SC. no spin at all.