The unit is rated up to 4500 lbs, Jamsteer 1 is adjustable with a turn of a knob. This knob will allow you to adjust the amount the powersteering will assist without getting out of the car! This helps when the track is tacky and rough, or running the cushion. Turn it down for dry/slick tracks to put more feel in the wheel. This unit does not fade or shut off when over worked.