ACTIVE DIFFERENTIALComputer-controlled differential used in World Rally that distributes engine's power to those tires with best grip to maximize performance.
AEROAbbreviation commonly used when referring to the all-important science of aerodynamics.
AERO PUSHWhen following another vehicle closely, the airflow off the lead vehicle does not travel across the following one(s) in a normal manner. Therefore, downforce on the front of the trailing vehicle(s) is decreased and it does not turn in the corners as well, resulting in an "aero push." This condition is more apparent on the exit of the turns.
AERODYNAMIC DRAGA number that is a coefficient of several factors that indicates how well a race vehicle will travel through the air with how much resistance. Crewmen work to get the best "drag horsepower" rating they can, determining how much horsepower it will take to move a vehicle through the air at a certain mile-per-hour rate. At faster speedways teams strive to get the lowest drag number possible for higher straightaway speeds.
AERODYNAMICSThe science of understanding different forces acting on a moving element in gasses such as air. The application of this study to racing is credited with much of the sport's recent progress as teams learn more about drag, air turbulence and downforce.