What causes the hissing sound after the turbo reaches 2000 RPM?

[AryaLee]

This situation may be caused by a damaged wastegate in the turbocharger or an air leak in the intake pipe. It is important to promptly inspect and repair this issue to prevent further damage. Below is relevant information: Explanation of turbocharging technology: Turbocharging technology has been applied to automotive engines for a long time. It can increase engine air intake without raising engine displacement. Engine operation: A car engine uses a mixture of fuel and air as its energy source. By increasing the air intake and correspondingly increasing fuel injection, the amount of combustible mixture in the engine cylinders is effectively increased. With more fuel mixture in the cylinders, each combustion cycle releases more energy, thereby enhancing engine power. Components of a turbocharged engine: A turbocharged engine includes a turbocharger, which consists of two main parts - the compressor turbine and the exhaust turbine.