Why Downshift When Overtaking?
2 Answers
To achieve greater torque and increase acceleration. Below is an analysis of why downshifting is necessary when overtaking: 1. Reason: The moment you upshift, the engine speed immediately drops, but the vehicle speed remains unchanged. At the same time, due to the reduced transmission ratio, the torque output from the engine to the wheels also decreases. After completing the upshift, you accelerate by pressing the throttle, but due to the reduced torque output, the vehicle's acceleration is slower. 2. Summary: If the car is in a high gear when overtaking, it becomes difficult to pass the vehicle ahead. Downshifting allows for greater acceleration, but the tachometer's RPM will increase.
I've been driving for over twenty years and am very skilled with manual transmissions. Downshifting when overtaking is mainly to increase the engine's RPM, allowing the car to instantly unleash greater power. When driving on mountain roads in the past, I often encountered large trucks blocking the way. If you don't downshift to overtake, it can be particularly strenuous. Once you drop to a lower gear, the engine noise increases slightly, but that surge of power allows you to easily pass the vehicle ahead. Especially when climbing hills or on highways, higher RPMs can prevent the danger caused by insufficient power. I recommend beginners practice this more—it can reduce overtaking time in critical moments and avoid collisions with oncoming vehicles. In short, this habit is both fuel-efficient and safe; don’t underestimate it.
