What is the relationship between engine RPM and vehicle speed?
1 Answers
The following is an introduction to the relationship between engine RPM and vehicle speed: 1. The conversion relationship between engine RPM and vehicle speed is: Vehicle speed = Engine RPM × Current gear ratio of the transmission × Wheel circumference. The engine RPM and vehicle speed do not have a one-to-one correspondence, as it also depends on the current gear, i.e., the gear ratio of the transmission. For example, at an engine RPM of 2500, the corresponding vehicle speed will differ between second gear and fourth gear. 2. Issues regarding engine RPM, vehicle speed, and the timing of gear shifting: (1) Shifting at 2500 RPM is not a mandatory rule. After starting in first gear, once the clutch is fully released, a strong press on the accelerator can lead to shifting into second gear. Then, from second to third gear, third to fourth gear, and fourth to fifth gear, shifting generally occurs at around 3000 RPM (for example, shifting from second to third gear at 3000 RPM, where the speed in third gear would be approximately 2200 RPM). The purpose is to ensure each gear operates within a healthy RPM range. (2) Shifting at 2500 RPM should be considered the minimum RPM for shifting. If the vehicle speed has not reached this RPM, you can continue driving in the current gear until exceeding 2500 RPM before shifting to the next gear. This principle applies to shifting above second gear.
