FTP: Fastest Time PAX - The fastest time in an event, once times are adjusted for class potential using the Racer's Theoretical Performance index, often known as RTP or PAX.

A run is scored with a DNS if the driver is unable to or elected not to start the run. A run is scored as a DNF when a portion of the course was not completed or when a car fails on course.

Dirty Run: A run where a cone was or multiple cones were hit.

Decreasing Radius Turn: Where the turn gets tighter as you go through it.

Course workers reset cones, call in cone penalties on the radio, and display red flags as needed.

Course Worker: Someone whose work assignment is on the course.

Course Designer: The individual charged with the task of designing and laying out the course at an autocross.

Clean Run: Indicated that a run through the course was without hitting cones.At Regional Solo® events, the Chief Steward duties are usually handled by the event Chairman/Chairwoman.

They can make final decisions on re-runs, changes, and accept any complaints or protest from competitors.

Chief Steward: The Chief Steward serves as the head referee for an autocross at SCCA® National Solo® events.Chicago Box: A short slalom disguised as a box.For autocross, negative camber is usually better as it can reduce tire wear and increase lateral grip. Wheel alignment camber indicates the amount the top of the tire is angled in (negative) or out (positive). Ground camber is a note of the slope either toward or away from an apex. Camber: refers to the angle of wheel alignment or the tilt of the ground.Some shocks/struts allow for adjustment in both directions, known as double adjustables (compression and rebound) while others are single adjustables (compression or rebound). Adjustable Shocks: Shocks or struts that can adjust the rate of forces acting upon it. The downward force is referred to as compression, while the upward force is rebound.Apex: The mid-point of a corner where your car is placed closest to the inside of the turn. This is usually the point in the corner where you go from turning the steering wheel to straightening the car (unwinding the wheel) and allowing the car to complete the corner.Want to learn the lingo of an autocross event? Here is a list of the most common autocross terms.

Drag racing classes explained