What is the difference between a four -speed gearbox and a five -speed gearbox?

The fourth gear of the four -speed gearbox usually is a direct gear, that is, the speed of the speed of the gearbox output shaft is the same as the speed of the engine crankshaft; The speed of the engine crankshaft is even higher.
When introducing a certain model, the torque and power in its technical parameters are usually maximum torque and maximum power. The power and corresponding speed indicated on the engine nameplate are called the rated power and the rated speed. The rated power is generally less than the maximum power (the maximum output power is also called instantaneous power, or the peak power). The output power of the engine is very related to the speed. As the speed increases, the power of the engine has also increased accordingly, but after a certain speed, the power is declining.
The maximum torque generally occurs in the range of the middle and low speeds of the engine. As the speed increases, the torque will decrease. For household cars, the greater the torque, the better; for off -road vehicles, the greater the torque climbing; for trucks, the larger the torque, the greater the weight of the car. In the same displacement, the greater the torque indicates that the better the engine. In the same car, the lower the torque when the gear is lower \\u0026 mdash; \\u0026 mdash; the torque is the largest when driving normally, and the torque when reverse gear is larger than one gear.
The quality of the car should be comprehensively evaluated from many aspects such as its power, economy, safety, comfort, and cost -effectiveness. It is difficult to say that its advantages and disadvantages are difficult to say from several indicators.