What is the minimum speed for fourth gear?
2 Answers
For a manual transmission car, the minimum speed for fourth gear is 40km/h. Below is relevant information about car gears: 1. Speed range: First gear corresponds to a speed of 0-5km/h, second gear to 5-20km/h, third gear to 20-40km/h, fourth gear to 40-60km/h, and fifth gear to 60-100km/h. 2. Shifting timing: Generally, the shifting timing for most cars is when the engine reaches 2000r/min, and should not exceed 2500r/min. For some high-displacement, high-power engines, shifting can be done around 3000r/min.
When driving in fourth gear, the minimum speed usually depends on engine torque and vehicle type. For example, my old car with a 1.6L engine can maintain a stable speed of around 40 km/h on flat ground in fourth gear. Any lower, and the engine starts to shake and may stall. This is related to individual driving habits. If you want to test it, gradually accelerate to fourth gear and then release the throttle to decelerate until you notice the point where the car begins to jerk—that’s the lower limit. It also depends on the load; with heavy cargo, you might need to maintain at least 50 km/h for stability. Regular transmission maintenance and checking clutch wear are crucial, as driving too slowly in a high gear can strain the engine and waste fuel. A fuel-saving tip is to keep the speed between 50 and 80 km/h in fourth gear, where the engine runs at lower RPMs and the fuel pump is more efficient. However, going below the minimum speed makes the car struggle, compromising safety and increasing maintenance costs.
