What speed can be achieved in 4th gear of a car?
3 Answers
In a car, 4th gear can achieve speeds above 40 km/h. Below is relevant information about car gears: 1. Speed range: First gear corresponds to speeds of 0-5 km/h, second gear to 5-20 km/h, third gear to 20-40 km/h, fourth gear to 40-60 km/h, and fifth gear to 60-100 km/h. 2. Gear shifting timing: For most cars, the optimal gear shifting occurs when the engine reaches 2000 r/min and should not exceed 2500 r/min. For some high-displacement, high-power engines, shifting can be done around 3000 r/min.
I've been driving for over 20 years. Generally, 4th gear can reach 100 to 120 km/h, but it really depends on the car's performance and how you drive it. For small-displacement cars, the upper limit might be around 100 km/h, while larger-displacement cars can easily hit 120 km/h or more. I often use 4th gear on highways, keeping the RPM around 3000 for optimal fuel efficiency. If the RPM goes too high, say over 4000, the car will start shaking, fuel consumption will spike, and it's both unsafe and bad for the engine. Road conditions also affect speed—for example, you might need to downshift when going uphill if the car lacks power. Safety first—I always pay attention to speed limit signs and avoid taking risks just to go faster. For new drivers, I recommend testing your car's sweet spot for fuel efficiency and not pushing it to high speeds unnecessarily.
The speed in 4th gear can vary quite a bit, generally ranging from 80 to 140 km/h depending on the vehicle's condition. With powerful engines like V6, pushing beyond 120 km/h isn't difficult. Transmission ratio designs differ—some cars prioritize fuel efficiency in 4th gear, making 100 km/h sufficient. I find the tachometer a crucial tool; maintaining 2500 to 3000 RPM is ideal for normal driving. Too low RPM results in insufficient power and higher fuel consumption, while too high increases risk and noise. For testing, find an open road to gradually accelerate and observe the response. From a safety perspective, avoid speeding and adjust according to traffic flow. Reduce speed for changing road conditions like curves to protect your beloved car.
