What is the difference between 6AT and CVT transmissions?
3 Answers
AT transmissions have excellent load-bearing capacity but are not as smooth as CVTs and are more costly; CVTs offer superior smoothness and lower costs but have limited load-bearing capacity. The specific details are as follows: 1. 6AT Transmission: The torque-bearing capacity of a 6AT transmission is very strong, which is why off-road vehicles use AT transmissions—even heavy loads pose no problem for AT transmissions. The previous notion that AT transmissions are not fuel-efficient can almost be dismissed, as modern AT transmissions are highly advanced. However, the smoothness of AT transmissions still cannot compare to CVTs, and they are more expensive. 2. CVT Transmission: CVT transmissions provide excellent fuel economy, unmatched driving smoothness, effectively reduce emissions, and are cost-effective. However, when subjected to excessive loads, they are prone to slipping, and extreme loads may even cause the steel belt to break. For typical family cars, the load is usually not enough to reach the breaking point.
I usually enjoy studying the feel of different transmissions when driving to work. The 6AT is a six-speed automatic transmission that shifts gears distinctly during acceleration, allowing you to feel the engine speed changes and the accompanying jerks. It provides a rhythmic driving experience, especially with quick responses during overtaking or climbing hills, but it tends to have higher fuel consumption in low-speed urban driving. The CVT is completely different—it has no fixed gears, operating like an infinitely long chain sliding back and forth. Acceleration is super smooth with almost no jerking, and it’s notably fuel-efficient, making it great for congested city driving. However, some complain that it feels like slipping, with an overly sensitive throttle at low speeds and a monotonous engine drone that lacks excitement. Overall, the 6AT suits those who enjoy driving pleasure, while the CVT is better for daily commuters prioritizing comfort and cost savings.
After years of driving, I've found that the 6AT transmission has a more complex structure, operating with planetary gears and a torque converter. It can feel a bit jerky during gear shifts, but it performs stably and powerfully at high speeds. However, maintenance involves more components and higher costs, with fluid changes typically needed every 50,000 kilometers. On the other hand, CVT is simpler, relying on a steel belt and cone pulleys for seamless shifting, with smoothness being its main advantage. It also offers better fuel efficiency, especially in hybrid models. But the steel belt is prone to wear over time and may cause issues, and repair costs aren't necessarily cheap. A few mechanics I know say CVTs feel great in new cars but aren't as reliable as 6ATs in older vehicles, recommending regular maintenance without delay.
