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What is the optimal RPM for a car at 120 km/h?

1 Answers

AngelinaFitz

07/28/25 6:21pm

Car at 120 km/h optimal RPM is 3400 rpm, the following is an extended introduction: 1. Top gear RPM introduction: Under normal driving conditions, the engine RPM in top gear is as follows: when the speed reaches 100 km/h, the RPM is generally 2800 rpm; when the speed reaches 110 km/h, the RPM is generally 3200 rpm. 2. The relationship between engine RPM and vehicle speed: The conversion relationship between engine RPM and vehicle speed is: vehicle speed = engine RPM × current gear ratio × wheel circumference. From this, it can be seen that engine RPM and vehicle speed are not in a one-to-one relationship, but also depend on the current gear, i.e., the gear ratio of the transmission. At the same speed, the RPM will be smaller. When driving, if the car's speed remains the same but the RPM becomes lower or higher, this is related to the car's displacement, and another factor is the gear of the transmission.

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