Turbochargers are currently widely used in various household vehicles, and are popular with many people due to their powerful and cost-effective advantages. However, nowadays, many people do not know much about automotive turbochargers, and even have some erroneous perceptions of turbochargers. The following are five common misconceptions about automotive turbochargers:

1. Turbocharging can improve engine thermal efficiency

Some people believe that turbocharging can improve the thermal efficiency of an engine, but this is a wrong view. An effective way to improve the thermal efficiency of an engine is to increase the compression ratio. A turbocharged engine presses more air and fuel into the cylinders. If the compression ratio is too large, the pressure and temperature in the cylinder increase sharply during ignition, which can easily cause detonation. Therefore, the compression ratio of turbocharged engines is generally lower than that of naturally aspirated engines, so its thermal efficiency is definitely not as good as that of naturally aspirated engines.

2. Turbochargers can save fuel

Theoretically, turbocharged engines consume more fuel than naturally aspirated engines with the same displacement. At the same power level, it saves more fuel than a naturally aspirated engine with a larger displacement.

3. The turbocharger must be filled with high-grade gasoline

Adding higher grade gasoline is beneficial to giving full play to the performance of turbocharged engines, but it is not necessary to add higher grade gasoline to turbocharged engines. High grade gasoline is mainly used to prevent engine knock, as turbocharged engines are more prone to knock. Once a knock occurs, it is necessary to delay ignition to eliminate the knock in order to avoid damaging the engine. This can lead to a decrease in output torque, so after adding high-grade gasoline, a larger ignition advance angle can be used to obtain better power.

4. Turbochargers allow gasoline to burn fully

Many people believe that after turbocharging, there is more air in the cylinder and gasoline can burn more fully. In fact, this is also a typical misconception. "Although the turbocharger presses more air into the cylinder, the engine control computer controls the air-fuel ratio, which is the ratio of air to fuel. As much air as fuel is injected, so much fuel is injected.". After pressurization, if there is more air, more oil must be injected, and the overall concentration of the mixture remains unchanged, so there is no argument for more combustion.

5. The turbocharger will work after the car is ignited

Turbochargers are not always operating, but are dependent on power requirements. If your power demand is low, the wastegate on the supercharger will open directly, and the exhaust gas will enter the exhaust pipe directly. If you do not drive the turbocharger, the turbocharger will not work, and at best, it will be playing at a very low speed under the influence of a small amount of exhaust gas.