On the ti, the stock ASC system does the following:
- Speed sensors at the front and rear wheels compare data, to be sure you aren't just taking a corner, and monitoring the wheel speeds that way.
- I am reasonably certain (because I cannot get anyone to confirm/deny this) that the ECU evaluates the speed of the two front wheels, and averages them. it also does the same for the two rear wheels.
- Then it compares the front and rear average speeds.
- If the rear speed is higher than the front speed (by some amount), it closes down a secondary throttle in front of the throttle you use with the accelerator pedal. The pedal throttle is normally closed (you apply pressure to open it) and the ASC throttle is normally open, so an actuator applies pressure to close it.
- The greater the disparity between the rear and front tire speed, the more 'throttling back' the ASC does for you.
- Pushing the button disables the ASC throttle, and the tires are free to spin (as is the car if you don't have a LSD).
You don't "feel" anything, because it is working well. Basically, it reduces the air to the engine, but uses an independent throttle, so you don't even feel it.
If you want to see it REALLY work, park on some wet grass and try to gun it out of there. You will have your foot to the floor, and the car will be on the verge of stalling...
I suggest installing a LSD and remove the small cable between the secondary throttle and its actuator...
What does a.s.c. do exactly? 
Linear Mode
