What is the performance effect after modifying the gear ratio of Haval H5?
3 Answers
After modifying the gear ratio of Haval H5, the engine speed will be higher when driving at the same speed and using the same gear compared to before. Gear Ratio: The gear ratio is the ratio of the angular velocities of two rotating components in a mechanism, also known as the speed ratio. The gear ratio between component a and component b is i=ωa/ωb=na/nb, where ωa and ωb are the angular velocities of components a and b, respectively; na and nb are the rotational speeds of components a and b, respectively. Calculation Method: Reduction ratio = input speed ÷ output speed, which is the ratio of the connected input speed to the output speed. For example, if the input speed is 1500r/min and the output speed is 25r/min, then the reduction ratio is: i=60:12.
I modified the gear ratio on my Haval H5 mainly to enhance off-road performance. Before, when climbing steep slopes or driving through muddy roads, I felt the power was insufficient and had to floor the throttle. Now, the torque has increased at low speeds, making hill climbs much easier—obstacles can be tackled effortlessly. However, fuel consumption has indeed risen, averaging 1-2L/100km more in the city and even higher on highways. The engine RPM is also noticeably higher, and the sound is a bit louder, but it doesn’t affect comfort. Since I frequently drive in mountainous areas, the modification has made off-roading more reliable. Once, I even rescued a friend’s vehicle, pulling through the mud steadily. I had it installed at a professional shop to ensure the differential and gears were properly matched, avoiding damage to the transmission. Overall, the results are great, and I’d recommend it to outdoor enthusiasts—just don’t treat it like a race car, as this vehicle is fundamentally a practical tool.
I modified the gear ratio on my Haval H5, and the effect was immediate. The engine runs smoother during acceleration, and there's no sluggishness when starting off, especially at traffic lights where it takes off much quicker. However, on the highway, I feel like the speed doesn't pick up as easily, with the RPM consistently above 3000, and the fuel consumption is slightly higher than before—about 1L more per 100 km, adding a few dozen bucks to my monthly fuel bill. For daily commuting, it's fine; climbing small hills isn't a struggle, and even with a fully loaded trunk, it doesn't feel strained. Before the modification, I was worried about potential issues, but after installation, everything works normally—no engine light or strange noises. I recommend checking the original gear ratio first before choosing a new one. The budget was around a thousand bucks, including installation, which I think is worth it. If you mostly drive in the city, modifying might not be necessary, but for someone like me who often carries loads and drives on rural roads, this adjustment enhances stability.
