quote from audiusa.com:
[quote]The Electronic Stability Control helps make the vehicle easier to control in handling situations close to the limit. It reduces the danger of swerving and thus improves directional stability. Electronic Stability identifies the car’s intended direction and response. It applies the brakes on individual wheels, thereby generating one-sided forces that help to keep the car moving in the desired direction. The program uses the Anti-lock Brake System (ABS), Electronic Brake-force Distribution (EBD), the Electronic Differential Lock (EDL) and the Traction control (ASR) system, and is permanently active.
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If you are driving the car hard, i.e. on a track, then definitely turn off ESP because it will just mess you up.
In dry street-driving conditions, it’s very hard to push these cars hard enough to activate ESP unless you’re driving like a jackass, on crappy tires, or both.
When driving in adverse road conditions such as rain, snow, dirt/gravel, etc. the benefits of ESP can quickly be seen if you push the car hard enough.
I’ve had an interesting experience with ESP and I definitely believe in it. I was driving in very heavy rain on some tires that were nearing the end of their useful tread depth. At a “fast” speed on an empty highway I pushed the car into a hydroplane. The hydroplane only lasted about one second before ESP kicked in. It reduced throttle, turned the steering a tiny amount, and applied the right amount of brakes for me all at the same time and the car returned to perfectly stable conditions.
edit: Anyone know if the steering wheel movement was actually performed by ESP or was that a result of the targeted braking?