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      10-30-2018, 03:09 AM   #1
Shortyy
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Launch Control not working properly...

Hey lads, have a little issue on my 2017 F80 M3.

The launch control doesn’t work properly. Now, it engages it fine, it will sit there on launch and I can adjust the revs. However when I launch, it attempts to go and immediately dies? The revs die and nothing happens. After a second or so it pulls off normal?

Any ideas? The car has GTS settings flashed on, but been flashed by a well known person and I’ve been assured it’s correct.

Any help appreciated.
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      10-30-2018, 05:47 AM   #2
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Quote:
Originally Posted by Shortyy View Post
Hey lads, have a little issue on my 2017 F80 M3.

The launch control doesn’t work properly. Now, it engages it fine, it will sit there on launch and I can adjust the revs. However when I launch, it attempts to go and immediately dies? The revs die and nothing happens. After a second or so it pulls off normal?

Any ideas? The car has GTS settings flashed on, but been flashed by a well known person and I’ve been assured it’s correct.

Any help appreciated.
You're letting off the gas pedal that's why.
You can't feather the throttle or move it.
If you let off even a little it'll cut all the power for a few seconds like you said.

You have to keep the pedal all the way down the whole time and it'll shift on its own.
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      10-30-2018, 08:05 AM   #3
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Quote:
Originally Posted by TIM3LES View Post
You're letting off the gas pedal that's why.
You can't feather the throttle or move it.
If you let off even a little it'll cut all the power for a few seconds like you said.

You have to keep the pedal all the way down the whole time and it'll shift on its own.
Sorry forgot to add, foot stays flat thorought. But still doesn’t play ball.
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      10-30-2018, 01:25 PM   #4
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This is correct, the launch control can act very odd.

I have a '18 ZCP. Even when I was 100% bone stock and after the 1200 mile break in service, letting off the brakes after seeing the checkered flags come up would be one of three things-

1. Launches as intended with minimal wheel slip and great acceleration (happened 33% of the time)
2. Wheels spun and revs went straight to redline with absolutely zero traction (happened 50%)
3. Car would have moderate wheel spin off the line (for about 0.5 seconds and I would move maybe 2 meters) and then completely cut power to the wheels, despite having never let off the throttle (happened a few times)

After tuning the car, it launched properly MOST of the time but still does #3 from above.

It no longer spins into oblivion (#1) though.
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      10-31-2018, 05:20 AM   #5
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I have No. 3 all the time
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      12-25-2019, 04:54 PM   #6
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This is exactly what’s wrong with my car no.3. If someone could tell what I need to replace I’ll do it. Just hoping it’s not a trans. Can someone reply with some input?
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      12-25-2019, 08:21 PM   #7
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I experience #3 all the time lol. I thought it was me though.
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      12-25-2019, 08:23 PM   #8
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Quote:
Originally Posted by TIM3LES View Post
You're letting off the gas pedal that's why.
You can't feather the throttle or move it.
If you let off even a little it'll cut all the power for a few seconds like you said.

You have to keep the pedal all the way down the whole time and it'll shift on its own.
Does it shift on its own? I didn't know that. N I'm always shifting early. Still new to this thing.
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      12-26-2019, 09:56 AM   #9
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Quote:
Originally Posted by M3classic View Post
Does it shift on its own? I didn't know that. N I'm always shifting early. Still new to this thing.
This is your problem then. You're commanding an upshift around the same time the TCU is commanding an upshift. So the car is shifting from 1st to 3rd with a power interruption.
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      12-26-2019, 04:50 PM   #10
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Quote:
Originally Posted by TrueNorthM3 View Post
This is your problem then. You're commanding an upshift around the same time the TCU is commanding an upshift. So the car is shifting from 1st to 3rd with a power interruption.
Exactly. Launch Control isn't some mystical entity.
A few key assumptions here:
  1. Break-in mileage and service have been achieved.
  2. Car is properly warmed to operating temp.
  3. Proper mileage interval has been reached following a prior use of Launch Control.

If these items are properly met, Launch Control is easy and straightforward to pull off with the DCT. I haven't had a failed attempt in 3 years of driving (excluding events of operator error).
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      12-27-2019, 01:27 AM   #11
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if im on d2 . will the dct automatic shift for me?
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      12-27-2019, 01:21 PM   #12
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Here’s a video it is not from shifting, as I know how launch control works I took my service guy on a ride and he is stumped.
https://www.dropbox.com/s/edkrnjjdts...rking.mov?dl=0

Last edited by Alpine_F82; 12-27-2019 at 01:38 PM..
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      12-27-2019, 04:25 PM   #13
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Quote:
Originally Posted by M4BimmerChris View Post
Here's a video it is not from shifting, as I know how launch control works I took my service guy on a ride and he is stumped.
https://www.dropbox.com/s/edkrnjjdts...rking.mov?dl=0
Am I wrong in assuming that "launch control" is intended for STOCK cars? I would imagine that, unless a tuner was able to manipulate parameters specifically for launch control, the CPU could not account for 32plus psi boost and 650 plus...hence the wheel spin.
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      12-27-2019, 05:19 PM   #14
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Quote:
Originally Posted by blockdoc View Post
Am I wrong in assuming that "launch control" is intended for STOCK cars? I would imagine that, unless a tuner was able to manipulate parameters specifically for launch control, the CPU could not account for 32plus psi boost and 650 plus...hence the wheel spin.
I’d say so. But my car is stock
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      12-27-2019, 07:21 PM   #15
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Quote:
Originally Posted by blockdoc View Post
Am I wrong in assuming that "launch control" is intended for STOCK cars? I would imagine that, unless a tuner was able to manipulate parameters specifically for launch control, the CPU could not account for 32plus psi boost and 650 plus...hence the wheel spin.
I have been running custom tunes for straight 93oct and full E85 for a few months. During that time, we've tweaked the throttle tip-in and torque curve, and I've adjusted the torque-by-gear settings.

Launch Control performs better for me now than it ever has before. It's actually "usable" now (assuming weather/pavement conditions are appropriate).
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      12-27-2019, 09:10 PM   #16
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Quote:
Originally Posted by M4BimmerChris View Post
Here’s a video it is not from shifting, as I know how launch control works I took my service guy on a ride and he is stumped.
https://www.dropbox.com/s/edkrnjjdts...rking.mov?dl=0
Assuming you are not letting off the throttle, I am also stumped. Does it ever work properly?
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      12-27-2019, 09:14 PM   #17
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Quote:
Originally Posted by blockdoc View Post
Am I wrong in assuming that "launch control" is intended for STOCK cars? I would imagine that, unless a tuner was able to manipulate parameters specifically for launch control, the CPU could not account for 32plus psi boost and 650 plus...hence the wheel spin.
I'm not an expert - but surprisingly the launch control system works pretty well, even adding ~80 wheel horsepower with the stage 1 tunes. I think the traction control systems detect wheel spin and add/pull power accordingly, regardless of peak power figures. My 60ft times are the same with a stock tune and a stage 1 tune, buy my 0-60 times are much better (~4.1 stock, 3.6 with stage 1)
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      12-27-2019, 09:43 PM   #18
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Quote:
Originally Posted by TrueNorthM3 View Post
I'm not an expert - but surprisingly the launch control system works pretty well, even adding ~80 wheel horsepower with the stage 1 tunes. I think the traction control systems detect wheel spin and add/pull power accordingly, regardless of peak power figures. My 60ft times are the same with a stock tune and a stage 1 tune, buy my 0-60 times are much better (~4.1 stock, 3.6 with stage 1)
Idk but I know that I may have a serious problem with my car. I wish it worked.
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      12-29-2019, 10:44 AM   #19
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It looks like launch control worked. It just looks like the car griped and bogged down to much, causing the launch control to deactivate. You should try launching at a higher rpm and see if that helps.
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      12-29-2019, 10:49 AM   #20
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Quote:
Originally Posted by TideMD View Post
Quote:
Originally Posted by blockdoc View Post
Am I wrong in assuming that "launch control" is intended for STOCK cars? I would imagine that, unless a tuner was able to manipulate parameters specifically for launch control, the CPU could not account for 32plus psi boost and 650 plus...hence the wheel spin.
I have been running custom tunes for straight 93oct and full E85 for a few months. During that time, we've tweaked the throttle tip-in and torque curve, and I've adjusted the torque-by-gear settings.

Launch Control performs better for me now than it ever has before. It's actually "usable" now (assuming weather/pavement conditions are appropriate).
Thanks man. Interesting.
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      01-02-2020, 12:09 PM   #21
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Quote:
Originally Posted by TrueNorthM3 View Post
Assuming you are not letting off the throttle, I am also stumped. Does it ever work properly?
No, I had it about 2 years ago work but it didn’t work it just did a big burnout.

I also did try different launch instead of in the 2’s and tried launching at 3500 and still nothing. I have new tires too.
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      01-02-2020, 12:54 PM   #22
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LoL at some people thinking it works all the time. News flash, it doesn't!
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