How to adjust when the car runs at 120 km/h with 3500 RPM?
2 Answers
If the car's engine speed is 3500 RPM when driving at 120 km/h, it may be due to improper gear matching. You should keep the engine speed within a relatively economical range. Shift to a higher gear if the RPM is too high, or shift to a lower gear if the RPM is too low.
I've experienced a similar situation in my car. Running at 120 km/h with the RPM reaching 3500 is indeed on the high side, which usually indicates some issues with the drivetrain. For example, if the gear isn't engaged correctly—like a manual transmission car stuck in a lower gear such as third or fourth—it can cause the engine RPM to soar. Or if an automatic transmission fails to shift into the highest gear, like when the overdrive (OD) mode isn't activated. I suggest first checking the current gear setting to see if it's caused by human error. Another common reason is transmission failure itself, such as hydraulic system issues or clutch wear, which requires professional diagnosis. Engine tuning could also be a factor; excessive carbon buildup or aging spark plugs can reduce power output efficiency. Overall, safety comes first. Sustained high RPM at high speeds increases fuel consumption and engine wear. I usually take my car to a trusted repair shop for a comprehensive check—they might resolve it by adjusting the transmission or replacing parts. Regular maintenance with a focus on the transmission system helps prevent such issues.
