Does turbocharging really save fuel?

Many old drivers say that turbocharged engines are fuel-efficient, and many salespeople say that turbocharged engines are more fuel-efficient when introducing them to customers.

However, this is not the case. If you know how a turbocharged engine works, then you can understand why I say this.

Turbocharged engine has a turbocharger, which consists of two parts, one is a compression turbine and the other is an exhaust turbine.

The exhaust turbine is connected with the exhaust manifold. When the engine reaches a certain speed, the exhaust gas has enough energy to drive the exhaust turbine to rotate.

When the exhaust turbine starts to rotate, the compression turbine also starts to rotate, so that the compression turbine can compress air and blow air into the cylinder.

Compared with the turbocharged engine and naturally aspirated engine with the same displacement, the turbocharged engine has more air in the cylinder, so it needs to inject more oil to burn with the air, otherwise the power of the engine will be weak.

Turbocharged engines have more air intake and more fuel injection, so compared with naturally aspirated engines, turbocharged engines with the same displacement actually consume more fuel.

Everyone knows the law of conservation of energy. Assuming that the thermal efficiency of naturally aspirated engine and turbocharged engine with the same displacement is the same, the power of turbocharged engine is higher than that of naturally aspirated engine, and the fuel consumption of turbocharged engine is also higher than that of naturally aspirated engine.

Then why does everyone say that turbocharged engines are more fuel efficient? The reason is that turbocharged engines can realize the power of higher displacement and higher fuel consumption engines with lower displacement and fuel consumption, which is well understood.

Generally, the power of 1.5 liter turbocharged engine is higher than that of 1.8 liter naturally aspirated engine, and the fuel consumption of that 1.5 liter turbocharged engine is lower, but the power is not worse than that of 1.8 liter naturally aspirated engine, so everyone says that turbocharged engine saves fuel.

Turbocharged engine can output the maximum torque in the middle and low speed range, which is why many consumers like this engine.

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