or here it is for those who are too lazy to look at the link

This setting controls how much the ESC limits the current draw of the motor, in order to maintain control of the car under acceleration from a dead stop, or coming out of a corner. The higher the setting, the "calmer" the acceleration will be from a stans-still, or from low speed to high. This also helps protect tires and drivetrains during bashing, by putting them under less stress from the motor. Remember, an electric system is only as good as the batteries powering it, and the system cannot make up for a lack of performance from the packs/connectors. While running in the very low limiting, or with the limiting off, punch & acceleration power are at the mercy of the batteries; the better the pack, the more off-the-line power you'll have available.