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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications Launch Control

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      05-19-2019, 09:31 PM   #23
MileHiGolfer
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Make sure you really mash the brake also, I wasn’t doing it hard enough the first time I tried it. If it’s lurching you aren’t braking hard enough. Oh and it’s freaking awesome and well worth trying.
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      05-20-2019, 09:09 PM   #24
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Also, make sure you give it at least 2-3 seconds after mashing the gas pedal. I was originally letting the brake off too soon, before the turbo's had a chance to fully spin up.

0-60 in 3.5 seconds (even with 4 wheel spin). Hoping for 3.4 soon.
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      05-21-2019, 02:27 AM   #25
AP
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How much strain does this put on the components out of interest?
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      05-25-2019, 08:45 PM   #26
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How much strain does this put on the components out of interest?
Wondering same thing because LC when used isn't like dumping the clutch from 3k. As it sits there at 3k rpm in launch control the rear of car is squatting down and there is definitely massive friction going on with the clutches/drivetrain. I kinda wish is was like LC in my M5 where you can tell it's in neutral and when you release it "drops the clutch"
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      05-25-2019, 10:20 PM   #27
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So this LC thing really freaks me out, but I’m interested in trying it at least once. Tonight I did try- I followed all the steps, but on the last part I pressed the brake hard with my left foot and started to press the accelerator... and I felt the engine lurch a bit as it struggled against the brake, just as you’d expect an engine to do in such a circumstance... I didn’t see any checkered flag, and I instantly backed off. Maybe I did it wrong? But it did lead me to wonder if it’s better to just mash the gas pedal all the way too?? And if you try this, is the idea that the car doesn’t engage the clutch (while the engine is at optimal RPM) until you release the brake? I think understanding what the car is actually doing would help ease my mind. Hopefully my little experiment didn’t damage my car at all!?? 🤣😬 Any ideas what I did wrong??
try going with your accelerator pedal all the way down (beyond point of resistance) ...there is a kick down switch....just try to feel it when the car is of.... i think this is what you are missing......
For M cars- you can slowly ease on gas to full throttle.

For non m cars you need to keep one foot really strong on brake and really mash the accelerator down to the floor otherwise it won't activate. It's really easy in an M, hard in all others.

The kick down you will feel is just a small metal button behind the pedal to give you feedback. Give that a shot.
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      05-27-2019, 11:30 AM   #28
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With my X3 M40i, I was able to put down faster times with Launch Control by turning DSC fully off! 0-60 in 3.9 versus 4.5 with DTC. In my owners manual, there was even a note saying professional drivers can achieve faster times with DSC completely turned off. Not sure if this is applicable to the M550i, but thought I'd share. Haven't tested it out in my new 750i yet.
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      05-27-2019, 12:10 PM   #29
MileHiGolfer
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Yeah turning DSC off is one of the requirements to activate launch control in the m550i, won’t work with it on. That’s impressive for a x3 m40i though!
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      05-27-2019, 12:34 PM   #30
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Originally Posted by MileHiGolfer View Post
Yeah turning DSC off is one of the requirements to activate launch control in the m550i, won’t work with it on.
There's a difference. The manual suggests pressing the button once which displays "TRACTION" on the dash. However, if you hold down the DSC button for 5 seconds, it turns DSC fully off. I'm saying - try the same procedure but turn DSC fully off.
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      05-28-2019, 01:00 PM   #31
MileHiGolfer
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Oh interesting! Someone with a dragy needs to try this and compare the results. I don’t get many opportunities to use LC in the city.
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      05-28-2019, 07:48 PM   #32
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So do you have to wait until 1200m for this to "activate" on an 19 m550i?

I tried it the other day and didn't get it to come on with almost 800m on it.
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      05-29-2019, 10:35 AM   #33
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I think the consensus is that LC is available from the start, but it’s suggested that you wait until after the run-in period to use it. The manual suggests that at least. Took me a couple of tries to get it to work the first time.
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      05-29-2019, 06:06 PM   #34
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so with DSC not fully disable, the transmission does something on the 1 and 2 gear upshifts that feels like the car is being pulled back - this one user improved his trap speed by 2 mph from 115 to 117 on a stock M550i by completing turning off DSC by holding it for 5 seconds.

the only issue with this is you don't get the flag saying launch control is active.
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