Usually four speed gearbox fourth gear is direct gear, also is the transmission output shaft speed and engine crankshaft speed; five speed gearbox of the fifth called overdrive, also is the output shaft of the transmission speed ratio of the engine crankshaft speed and high.

On the introduction of some models, the technical parameters of the torque and power is usually the maximum torque and maximum power. Engine nameplate marked on the power and the corresponding speed is called the rated power and rated speed rated power, generally less than maximum power ( maximum power output is also called the instantaneous power, or peak power). The power output of the engine with the rotation speed greatly, with the increase of rotating speed, the power of the engine is also improved, but to a certain speed, power has declined.

Maximum torque is generally appear in the engine, in low speed range, with the increase of rotational speed, torque instead will decline. For the family car, the greater torque acceleration as possible; for off-road vehicle, torque of the slope increases; to van, the torque of the weight of the larger cart. In the displacement under the same condition, the greater torque engine note.

The same car, gear lower torque is bigger -- normal driving a maximum torque, while the reverse torque than a big.

The quality of the vehicle from its power, economy, safety, comfort and cost and other aspects of comprehensive evaluation, single from several index it.