My car sucks. (times from the track last night)

Okay. Maybe I'm used to a normal car and how they run but the BMW can't launch for ****. It is not me that was the problem last night, it was the car.

The track opened up last night and I got out there to see how I would run. I hoped to pull a 14.7 but that didn't happen. I got out there and turned the DSC off like I normaly do for daily driving etc... I launched at 3 grand, the tires chirped the car then bogged down and then decided that it would actually go. ****ing DSC ****! I got back to the staging lanes after the first run and broke out the manual to see how to turn the ****er all the way off. The book said to hold the DSC button down for 3+ seconds until the yellow 'brake' light comes on. That was supposed to turn off the active differential thingy. So I did that and when I ran the second time the car wouldn't go anywhere. I went through first, second and third and was still in front of the bleachers looking like a dumbass. I was sooo pissed. I thought it was me and that I just goofed the thing up. So I ran a second time with it all the way off to see if I can fix what happened.... the same thing happened. So on my last 2 runs of the night I just turned the DSC off and left the active differential on. The car will actually go in that form but still bogs like a mofo. I hate it. My Celica pulled better times than this.

1st run: 60'= 2.633 1/4= 15.563
2nd run: 60'= 3.021 1/4= 25.589 (I had DSC and active differential off)
3rd run: Didn't even stop for my time slip. The car wouldn't pull through 3 gears.
4th run: 60'= 2.588 1/4= 15.313
5th run: 60'= 2.434 1/4= 15.208

The 1st, 4th & 5th runs I had just the DSC off.

Something must be wrong. With my DSC fully disabled (brake light on), it will light them up, no intervention at all. In either of the other modes (DSC light only, or fully activated), it drives me nuts.

Did my clutch take a **** on me? I don't get how I could have launched any differently. I guess I'll go play with it tonight. I was hoping to get better feedback but I guess it's Saturday and no one's at work but me. Ah well.

What time should I have pulled?

last time i checked only M cars have diff...