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can cars go faster than the speedometer
No.Generally, the speed indicated on the dashboard of an automobile is more than 200 km / h, but when the accelerator is pressed to the bottom, it is generally impossible to drive at a high speed. The reasons are as follows:
One is the speedometer on the dashboard, which is marked according to the high possible speed value under the no-load high speed of the engine. It is only the speed of the engine, not the actual speed of the car;
Second, there needs to be a reserved space between this large value and your actual speed, which is generally no more than 20%. For example, when your car is fast enough to drive 100 km / h, the large value of the speedometer is generally 120, because your car is on a horizontal road, and there is no adverse wind and other external forces. Under the experimental conditions, the measured large output value and speed, but when you actually drive in reality, You may be downhill and downwind. The speed must be higher than that when you test, so you need to leave 20% more;
Third, from an economic point of view, the same car is often equipped with different engines, such as 4-cylinder 2.0, 4-cylinder 2.0T, V6 3.0, and even V8 and V12. They are all the same models. In order to save money, I can't make every car with the same dashboard, but only the one with fast speed.
Therefore, there is a little deviation between the speed value on the speedometer on the instrument panel and our actual speed. However, the industry basically stipulates that there should be no more than 7% error. If the actual speed is 100 km / h, the display of the speedometer should not be less than 93 km / h or more than 107 km / h. However, from the perspective of safety, the speed shown on the table is often higher than your actual driving speed, Of course, there are many inaccurate factors. In addition to the deliberate design and industrial manufacturing deviation of the manufacturer, when the circumference and diameter of the tire change due to wear, the speed will also have deviation. Although the deviation is small, it will not have a great impact on our daily use.
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