Why is it difficult to shift from 3rd gear to 1st gear when going uphill in a manual transmission car?
1 Answers
The reason why it is difficult to shift from 3rd gear to 1st gear when going uphill in a manual transmission car is due to the mismatch between the engine speed and the drive shaft when attempting to shift into a lower gear at a relatively high speed. The most obvious symptom is that it is difficult to shift into 1st gear during normal driving. The general principle of operating a transmission is that upshifting should be done step by step, while downshifting can be skipped. The principle of downshifting is to shift from a higher gear to a lower gear that can maintain appropriate torque based on the current speed. Skipping gears when downshifting can be divided into two situations: one is naturally downshifting when the speed decreases to a certain extent; the other is forced downshifting, also known as "gear grabbing." Methods for going uphill: When going uphill, the gear should be determined based on the engine speed. If the engine speed drops below 2000 rpm when climbing in 3rd gear, it is necessary to downshift to 2nd gear. If the slope is too steep and the car is fully loaded, it may even be necessary to shift to 1st gear to climb. When going downhill, the car should be driven in a certain gear, generally determined by the slope. A steep slope may require 2nd gear. Methods for emergency deceleration: Ignore the current gear and perform emergency deceleration by pressing the brake pedal as needed for driving or road conditions. If the engine does not shake (commonly known as "lugging," where the engine speed and gear are severely mismatched), there is no need to press the clutch pedal. If it is necessary to press the brake pedal fully or if the engine starts to shake, the clutch pedal should also be pressed simultaneously to prevent the engine from stalling. Afterward, shift into the appropriate gear based on the current speed.
