What is the relationship between RPM and gear?

1 Answers
Espírito Santo
07/30/25 9:37am
When driving normally, the engine needs to shift to appropriate gears to maintain the RPM within the most fuel-efficient range of 1800-2200 RPM. The engine's fuel consumption curve is U-shaped, with the most economical range being between 1800-2200 RPM, and the most fuel-efficient point at 1800 RPM. Matching the right gear with the right speed is crucial; otherwise, it may cause lugging or severe engine vibration, eventually leading to stalling. Key considerations for shifting between RPM and gears are as follows: 1. First gear is for starting: Its gear ratio is similar to reverse gear, so it should not be used for prolonged high-speed driving. Generally, shift to second gear at around 2000 RPM. 2. Shift decisively: Avoid hesitation. Press the clutch pedal quickly and release it slowly. 3. When downshifting, press the clutch first before releasing the throttle: Otherwise, the engine will slow down the vehicle. 4. When upshifting, pre-load the throttle before releasing the clutch: Especially important during high-speed driving.
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