For a car to run fast, it must have strong power. The power system of a car can be roughly divided into two categories: natural air intake system and supercharged air intake system. In the European sports car, in addition to the BMW car company still insist on using natural intake engine, the other car companies in order to enhance the vehicle's power performance, have adopted the supercharging system, for example: Mercedes-Benz sports car using mechanical supercharging system, Squire car for the turbocharging of the originator. In recent years, Japanese cars have also begun to use turbocharging technology in large numbers. The natural air intake system does not have any kind of supercharger installed, but only uses the negative pressure generated by the downward movement of the piston to suck in the mixture. Although the natural intake system is able to get a larger horsepower output through the variable valve timing system, the power increase is very limited. In order to effectively increase engine output, the use of a supercharger system is arguably the most effective way.

The most common types of engine supercharging systems are mechanical supercharging and exhaust gas turbocharging.

The engine mechanically drives a mechanical supercharger for boosting, which is called mechanical supercharging. When an engine is mechanically supercharged, the supercharger is usually driven by the engine crankshaft through a gear. The supercharger is generally used centrifugal or Roots pressurisation, individual screw pressurisation. In foreign countries have also begun to use the new mechanical scroll type supercharger. Because driving the pressurised engine consumes a certain amount of engine output, the thermal efficiency of the mechanically supercharged engine is not necessarily improved, and is sometimes lower than that of a non-supercharged internal combustion engine. When selecting the boost pressure, it is important to ensure firstly that the required average effective pressure can be achieved, and secondly that the lowest possible fuel consumption rate is obtained. These two requirements are often contradictory for mechanical supercharging. If the pursuit of the average effective pressure, it will inevitably lead to lower mechanical efficiency and higher fuel consumption. Therefore, the selection of the boost pressure value should seek the best compromise between power and fuel consumption. Mechanical supercharging systems are more commonly used on European vehicles. Since the supercharger of a mechanical supercharger runs continuously under the crankshaft, it does not suffer from turbo lag as in the case of turbocharging. Although mechanical supercharging can only increase power output by about 10 to 20 per cent, the smoothness and continuity is not as good as that of turbocharged engines.