What is the optimal RPM for an automatic transmission car?
2 Answers
Automatic transmission cars perform best at 1800 to 2000 RPM. Below is relevant information about RPM: 1. Definition: RPM refers to the number of revolutions per minute of the engine crankshaft. The engine's RPM level relates to the number of work cycles per unit time or the effective power output of the engine. 2. RPM during gear shifting: For automatic transmission vehicles, when the speed reaches 20 km/h, shifting to 2nd gear is appropriate at 1500-2000 RPM. When the RPM exceeds 2000, shift to 3rd gear, which then approaches 30 km/h. Similarly, shift to 4th gear when the speed reaches 50 km/h. This is because shifting at 2000 RPM can easily cause carbon buildup, so the fuel-efficient and appropriate RPM range is 1500-2000 RPM.
When driving, maintaining the automatic transmission at around 2000 RPM is the most comfortable and also good for the car. Keeping this RPM in city driving ensures both fuel efficiency and sufficient power. I've experienced that prolonged low-RPM driving can lead to carbon buildup, but running at higher RPMs on the highway, say 3000 to 3500 RPM, is within the normal range. The key is to listen to the engine sound—as long as it's smooth and not straining, it's fine. A higher RPM during cold starts is normal; it will stabilize once the engine warms up.
