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Pulled this off another site for reference:
The normal state of the stability/traction control systems (no lights on) is DSC on (DSC: Dynamic Stability Control). As noted, in this mode the car will brake individual wheels and/or override the throttle as needed, to keep the vehicle on course and suppress almost all wheelspin.
Pressing the traction control button once, briefly, actually switches DTC on (Dynamic Traction Control). DTC tolerates considerable wheelspin to improve loose-surface traction (snow, gravel, sand). It also raises the threshold for DSC's yaw-control intervention. DSC is still active, but it will wait for you to get further out of shape before attempting to save you.
Pressing and holding the DTC/traction button for 2+ seconds turns DTC and DSC off. Now you're back in 1980 and the only thing keeping the car on line is your own wits & skill. However, the xDrive dynamic torque-bias control is still active (can only be disabled by pulling a fuse), which still keeps the car considerably more stable than a rear-driver with DSC off.
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E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler.
Standing Mile Record Holder for Xi over a mile high: 168.2MPH @ 5512'; The Colorado Mile hosted by The US Mile.
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