8AT

8AT refers to an eight-speed automatic transmission. This type of transmission offers eight distinct gear ratios, allowing the engine to operate within a more efficient range across a wider variety of speeds and loads. Compared to transmissions with fewer gears, an 8AT can provide smoother shifts and improved fuel economy. It achieves this by enabling the engine to stay closer to its optimal power band more of the time.

The design of an 8AT typically involves a planetary gearset system, often with multiple clutch packs and brake bands to engage and disengage different gear combinations. The control of these components is managed by sophisticated electronic control units (ECUs) that monitor vehicle speed, engine load, throttle position, and other parameters to determine the optimal gear for the current driving conditions. This allows for quick and precise gear changes, enhancing both performance and driving comfort.

Eight-speed automatic transmissions are commonly found in a range of vehicles, from sedans and SUVs to performance cars and trucks. Their widespread adoption is due to the balance they strike between efficiency, performance, and smoothness. Automakers often tune these transmissions to prioritize either sportiness or fuel economy, depending on the vehicle's intended market. The development of 8AT technology has been a significant advancement in automotive powertrain engineering, contributing to the ongoing trend of improved vehicle efficiency and driving dynamics.