Why does Usr 125 sound like a pressure relief valve?

The reason why the air pressure valve makes sound:

1. Driving a turbocharged car, when stepping on the accelerator to accelerate, the accelerator will open and the engine will send out "Huh?" As the speed increases. Sound, the high temperature and high pressure exhaust energy discharged by the engine drives the exhaust turbine to rotate;

2. When the working speed of the turbocharger is reached (that is, the turbine speed exceeds 65,438+million revolutions per minute), the turbocharger compresses the surrounding air, which increases the air intake of the engine and improves the power performance of the engine;

3. When we collect oil, the throttle opening decreases rapidly until it is in the closed idle state, which means that the engine does not need air intake, otherwise the air flow in the intake pipe will be blocked at the throttle;

4. But at this moment, the turbocharger has not stopped working! Due to inertia, the turbocharger remains at 654.38+ million revolutions per minute.