Why is the ZF 9AT inferior to the 8AT?
2 Answers
The reason why the ZF 9AT is inferior to the 8AT is its smaller maximum torque capacity. Here are the specific details: 1. Principle: Planetary gear set + clutch. 2. Content: The 9AT automatic transmission comes in two types—transverse and longitudinal. Transverse transmissions are more common in front-wheel-drive vehicles, while longitudinal transmissions are more common in rear-wheel-drive vehicles. The number of gears in a transmission is not necessarily better if it is higher; tuning level is more important than the number of gears. Front-wheel-drive transmissions prioritize compact size, transmission efficiency, and shift speed, where the Aisin AWF8G series transmissions have obvious advantages. The 8AT is highly efficient, with a more complex structure than the previous 6AT, and improved transmission efficiency. The transmission range increased from 6.547 to 7.09, with a maximum torque capacity of 380N·m. The design of the vane-type oil pump, torque converter, and valve body has been optimized, and low-viscosity transmission oil is used, resulting in slight improvements in power, shift smoothness, and fuel consumption.
As an ordinary person who drives frequently, I feel the ZF 9AT is worse than the 8AT because it's heavier and more complex. I've driven a Jeep equipped with the 9AT, and there's noticeable jerkiness during gear shifts, especially at low speeds or on city roads. The acceleration isn't smooth either, which affects the driving pleasure. In comparison, my friend's BMW uses an 8AT, which is much smoother and more seamless. In theory, the extra gear should save fuel, but in reality, the improvement in fuel efficiency is minimal. The added weight cancels out the advantages and increases the risk of component failures. This design might be overly focused on high-tech features while neglecting user experience. The discomfort while driving makes me miss the more reliable 8AT. I recommend prioritizing test drives when choosing a car to avoid regrets later.
