An excellent automobile turbocharger needs the following key conditions:

1. Efficient performance: An excellent turbocharger should have efficient supercharging performance, which can provide enough supercharged airflow and improve the power output and combustion efficiency of the engine.

2. Durability: The turbocharger needs to adopt high-quality materials and precise manufacturing technology to ensure that it has good durability and stability, and can run stably for a long time without being easily damaged.

3. Fast response: An excellent turbocharger should have a fast response speed, which can quickly provide pressurized air flow, reduce the lag time of the turbine, and improve the power output and acceleration performance of the engine.

4. Low noise: The turbocharger should be designed in a low-noise working state to reduce the noise and vibration when the engine is running and improve the driving comfort.

5. High efficiency: An excellent turbocharger should have high supercharging efficiency, which can provide enough supercharged airflow, reduce energy loss as much as possible and improve fuel economy and environmental protection performance.

6. Safety: The turbocharger needs to have safety performance, which can maintain stability at high speed and avoid engine damage or other safety hazards caused by failure.

To sum up, an excellent automobile turbocharger needs to have key conditions such as high efficiency, durability, quick response, low noise, high efficiency and safety, so as to ensure that it can effectively improve the engine performance and maintain a stable and reliable working state.