from another forum:
"The F30 does not have LC "launch control".
What we can do is brake torque.
At around 2100 rpm, even with the brakes on, the rear wheels will start to spin a bit.
I found a great way to launch hard is to brake, then throttle and when rpm gets to around 2000 let the brakes go.
But, don't just stomp on the throttle WFO cause you'll just do a wheel spin demonstration.
Modulate the throttle so that you get a bit of wheel spin and then hook up.
I used sport+ mode as it allowed plenty of wheel spin with no intrusion.
I didn't try turning DTC and DSC fully off with the button for that.
Give it a shot and see.
You can try different rpms as well as better throttle control.
Of course, to know which method yields the best accel times, you'd have to go to a 1/4 mile track and get some real numbers.
These cars are not 1/4 mile machines, but it's still fun to get to the track.
I doubt I'll take mine when it gets here. "