What RPM at 120 km/h Indicates a Good Engine?
2 Answers
Currently, the displacement of mainstream engines is mostly around 1.5. For engines of this displacement, the RPM generally stays between 2200 and 3200. Naturally aspirated engines and turbocharged engines have different RPM values. Due to the boost from the turbine, turbocharged engines typically have lower RPM values compared to naturally aspirated engines. Depending on the vehicle class, the RPM at 120 km/h can be roughly categorized as follows: For A-class vehicles, priced between 100,000 to 150,000 yuan, the corresponding engine RPM at 120 km/h is 2500~3500 rpm. For A+ class sedans, the RPM at 120 km/h is around 2500 rpm. For B-class sedans, it is approximately 2000 rpm, and for C-class sedans, it is around 1800 rpm. Owners can match these values to their own vehicles. If your vehicle's engine RPM at 120 km/h exceeds 3500 rpm, it is definitely abnormal or may be quite old, and the owner should consider replacing it with a new car.
I usually drive a 1.5T car for my daily commute. When cruising at 120 km/h on the highway, I've glanced at the tachometer and noticed the RPM hovering around 2100-2300. The biggest advantage of low RPM is fuel efficiency – a long trip can save you half a tank of gas. I remember driving my friend's older car once, where the RPM shot up to 3000 at 120 km/h, and the noise was so loud it gave me a headache. Nowadays, newer cars come with more gears, like 9AT or even 10AT, making highway driving incredibly smooth. However, lower RPM isn't always better. Take my cousin's small-displacement turbocharged car, for example – if the RPM is too low, it lacks power during acceleration.
