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A speed limiter is a governor used to limit the top speed of a vehicle. For some classes of vehicles and in some jurisdictions they are a statutory requirement, for some other vehicles the manufacturer provides a non-statutory system which may be fixed or programmable by the driver.
DRS in open (top) and closed (bottom) positions on a Red Bull RB7 in 2011. In motor racing, the drag reduction system (DRS) is a form of driver-adjustable bodywork aimed at reducing aerodynamic drag in order to increase top speed and promote overtaking. It is an adjustable rear wing of the car, which moves in response to driver commands. [1]
To establish the top speed for cars the requirement is, in addition to the above, an independent road test with a two-way run. The mean of the top speed for both runs is taken as the car's top speed. [ 1 ] [ 2 ] In instances where the top speed has been determined by removing the limiter, the test met these requirements, and the car is sold ...
Chopping a car, known more fully as "chopping the top," goes back to the early days of hot rodding and is an attempt to reduce the frontal profile of a car and increase its speed potential. To chop a roof, a shop cuts down the pillars and windows, lowering the overall roofline.
As drag area CdA is the fundamental value that determines power required for a given cruise speed it is a critical parameter for fuel consumption at a steady speed. This relation also allows an estimation of the new top speed of a car with a tuned engine:
A car's speed is limited by the power required to drive it against air resistance, which increases with speed. At the maximum possible speed, the engine is running at its point of maximum power, or power peak , and the car is traveling at the speed where air resistance equals that maximum power.
A governor, or speed limiter or controller, is a device used to measure and regulate the speed of a machine, such as an engine.. A classic example is the centrifugal governor, also known as the Watt or fly-ball governor on a reciprocating steam engine, which uses the effect of inertial force on rotating weights driven by the machine output shaft to regulate its speed by altering the input flow ...
Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds.