Car bogged and became unresponsive after using launch control

[Keebin]

Had the same issue, car stuttered off the launch then lost all power scared me so much i haven’t launched it since, stock m3 with active mid pipe.

[blockdoc]

Don't use launch control lol.

[hellokitty]

You gotta commit to launch control and don’t let off the gas like a 👧

[Alpine_F82]

Originally Posted by hellokitty

You gotta commit to launch control and don’t let off the gas like a 👧

I do keep it down the whole time

[nickl630]

Bump. I just had the same issue on my CS this weekend.

Went to a show yesterday (at a drag strip) and decided to take the CS down the 1/4 for fun.

Weather was cold, 55 or so and cloudy. I have stock PSS's on the car.

I only made two passes, both right around 14 seconds (lol) trapping at 118mph.

Burnout was fine, DSC off, slam throttle. Nice smoke show. Everything felt great.

First launch I blew launch control. I activated it before I was properly staged and had to launch the old way. Held RPMs around 3000 and left on green... The car shuddered (felt almost like wheel hop) and then fell flat on its face... Throttle input did nothing. Backed completely off then went back in.. Car took off and went down the strip fine.

Second pass: same thing.. However launch control was used. Dropped it down to 2500ish RPM.. left perfectly..felt a shudder and fell flat like it was in limp mode. Backed completely off then back on and it went fine.

Found it strange it worked great doing burnouts and once it got going. Car drove great otherwise. Possibly the computer feeling too much slip and shutting the throttle off?

Settings were DSC off of course, sport plus on everything minus suspension which was in comfort.

[nbennettksu]

See this all the time at the track, once the tires start to slip, it turns into a turd, then picks up 3-4 seconds later. Very important to do a burnout and heat the tires up or this will happen 9/10 times.

[nbennettksu]

Originally Posted by nickl630

Bump. I just had the same issue on my CS this weekend.

Went to a show yesterday (at a drag strip) and decided to take the CS down the 1/4 for fun.

Weather was cold, 55 or so and cloudy. I have stock PSS's on the car.

I only made two passes, both right around 14 seconds (lol) trapping at 118mph.

Burnout was fine, DSC off, slam throttle. Nice smoke show. Everything felt great.

First launch I blew launch control. I activated it before I was properly staged and had to launch the old way. Held RPMs around 3000 and left on green... The car shuddered (felt almost like wheel hop) and then fell flat on its face... Throttle input did nothing. Backed completely off then went back in.. Car took off and went down the strip fine.

Second pass: same thing.. However launch control was used. Dropped it down to 2500ish RPM.. left perfectly..felt a shudder and fell flat like it was in limp mode. Backed completely off then back on and it went fine.

Found it strange it worked great doing burnouts and once it got going. Car drove great otherwise. Possibly the computer feeling too much slip and shutting the throttle off?

Settings were DSC off of course, sport plus on everything minus suspension which was in comfort.

Once tires slip a little in launch control, it bogs down and pulls power.

[jmg]

For what it's worth I don't drag race, but with DCT off in sport mode I get better launches on than sport plus, where I tend to slip the rears more. It's manageable but I'm sure launch control will get me a few tenths faster. This is in autocross mind you, so while launches are very important, it's not the end all that be all since there is so much more to the course than just the launch and the timer starts a few feet after start, not at start. Food for thought.