[luckyg777]

Ok... so I've had a read on the forums re: launching, etc., but still having problems with launching my car.

I have a 2007 E92 335i with the steptronic transmission.

I've tried...

1. Launching by just 'hitting the accelerator' in D/DS/Paddle, with both levels of traction control turned on/off
2. Launching in 2nd gear (using paddle shifters)
3. Holding the brake down until 2-3rpm and then letting go

In all of my tests, the car just will not launch off the line. No tire slip, no quick acceleration. It just 'thinks' for a second and then takes off. Once it gets going it accelerates fast, but it just won't launch. If it's a rolling start (e.g. slowly taking a turn and then accelerating) I can get it going as quickly and with as much wheel spin as I want.

Any thoughts?

In case it's related -- my HPFP is playing up, although it seems to fix itself when I turn the car on/off. Taking it to the dealership next week.

[M3E46M]

Sounds like the following but hard to tell from your description:

1. Throttle response switch may be bad
2. Check for boost leak
3. or transmission .....

If under warranty take it to the dealer and have them check the throttle switch/sensor or whatever it's called now a days.

[Thumperx]

Hmm,
Here's a thread that my interest you:
http://www.e90post.com/forums/showth...launch+control

See post #7. I've used his technique and works for me. Check it out and report back your findings.