In Reply to: Re: Is LSD on 540iA Sport via ABD or conventional posted by Brad D on August 11, 1999 at 18:05:23:
To settle once and for all the differential situation...
Would someone with a 540i be so kind as to do the following experiment (note I am not responsible for your premature tire wear and/or encounters with local law enforcement):
With DSC on and the car at a standstill, put tranny in 1st gear, raise engine RPM to 3000 or higher, and simultaneously dump the clutch and stand on the loud pedal. Now turn around, get out of the car, and count the number of black stripes painted onto the asphalt.
Next, repeat the above experiment, only this time, with DSC turned off.
1999 5-series brochure sez All Season Traction (AST) can individually apply brake pressure to either rear wheel to control wheel spin. Obviously BMW had icy roads and bad weather in mind, but I want to know how effective this is at the drag strip and when attempting a nice, roasty burnout. I also want to know what effect the "DSC" button on the dashboard has on all this. I am skeptical that brake pads and software can effectively mimic that of a true limited-slip differential. M5 literature sez LSD is standard, BTW.