What is the speed for shifting from 3rd gear to 2nd gear?

[JoannaLee]

The optimal speed for shifting from 3rd gear to 2nd gear is when the speed drops to 25 km/h, as 3rd gear corresponds to a driving speed between 20 to 40 km/h. This gear is commonly used in urban driving, while 2nd gear corresponds to a speed range of 5-20 km/h. Generally, the ideal shift timing for most cars is when the engine speed reaches 2000 rpm, preferably not exceeding 2500 rpm. For high-displacement, high-power engines, the maximum efficiency range is often delayed, so shifting around 3000 rpm may be considered. Different vehicles exhibit varying performance in terms of engine and transmission, and drivers can identify the right shift timing by listening to the engine sound. A dull engine sound usually indicates it's time to upshift. Driving in a gear that's too high increases engine pressure and fuel consumption, significantly affecting both the engine and transmission. Conversely, if the engine speed falls below around 1500 rpm, it's time to downshift. Upshift timing: When the engine has ample power, it emits a dull humming sound. After upshifting, if there's no power shortage or drivetrain vibration, and the vehicle accelerates smoothly and naturally, it indicates accurate upshift timing. Downshift timing: When the vehicle's speed and engine speed continuously decrease, and you feel the car losing power with the engine compartment starting to vibrate, it's time to downshift one gear. Downshifting too early can cause noticeable jerking, wasting engine power and increasing fuel consumption, while also negatively impacting the engine and transmission lifespan. Downshifting too late may result in insufficient power even after the shift, leading to continued jerking. Misjudging the shift timing can cause such irreversible consequences, affecting the driving experience. Manual gear shifting: Generally, to engage 1st gear, push the lever to the left and then forward; for 2nd gear, push left and then downward; for 3rd gear, return to neutral and push straight upward; for 4th gear, return to neutral and push straight downward; for 5th gear, push straight to the right and then upward (refer to your vehicle's gear markings for specifics). Manual transmission shifting tips: While shifting, coordinate the clutch and throttle properly. Press the clutch pedal fully, then release the throttle pedal, and quickly shift to the desired gear. Release your hand immediately after shifting; avoid keeping it on the gear lever (commonly known as the gear stick) for too long, as this can damage it. For manual transmission vehicles, always remember the principle of "accelerate before upshifting, decelerate before downshifting." Before upshifting, press the throttle to increase speed, and before downshifting, release the throttle to reduce speed. Always press the clutch pedal fully before shifting, and operate the gear lever gently, quickly, smoothly, and accurately.