A Diversity Antenna system has two, or more, antenna which are mounted on a vehicle. The system will select which antenna to take the radio or other device, signal (AM, FM, WiFi, satellite, microwaves, mobile phones), from depending on which one is receiving the clearest signal – also known as best Signal to Noise Ration (SNR). Users should experience less ... Read More »
Dialed In
When a car is performing at its maximum. Also called “hooked up.” Read More »
Driver Evaluation
An all-inclusive assessment of the driver. It should include tests of one’s sensory motor function, cognitive processing, general knowledge and an on-road performance evaluation in an appropriately-modified vehicle. This evaluation should also include a review of medical history and driver’s-license status. The final report recommends accommodations needed and any restrictions that might be necessary. Read More »
Differential
The gear assembly connected between the driving wheels (or front and rear axle in case of 4WD or AWD) that permits the wheels to turn at different speeds. This is especially important when going around a corner since the inside wheels turn more slowly than the outside wheels. Read More »
DNF
Literally, the race participant DID NOT FINISH. Read More »
Disc Brakes
A brake where a kidney-shaped brake pad, lined with asbestos or other heat resistant material is pressed against a disc attached to the wheel to stop the car. Read More »
Disc
Made of metal, it is connected to the wheel and rotates with the wheel. When the brakes are applied, the brake pads are forced to rub against the disc; this friction causes the wheel to slow and eventually stop. Read More »
Double Wishbone
Type of suspension where two V arms form the upper and lower pivoting and locating members. Most commonly used on front suspensions since they work well with steering links, but occasionally are used on rear suspensions. Read More »
Displacement Taxes
Taxes levied on cars with larger engines. Read More »
Displacement
The volume of a cylinder. The geometric volume is determined by the diameter of the cylinder and the distance the top of the piston travels. The displacement of an engine is the total displacement of all its engine cylinders, usually expressed in liters (L) or cubic inches (c.i.). Read More »
