What does the term "final drive ratio" refer to?

The term "final drive ratio" specifically refers to the gear ratio found within the differential of a vehicle. This ratio indicates how many times the driveshaft turns in relation to the wheels. It plays a crucial role in determining the overall performance characteristics of the vehicle, particularly in how power is transferred from the engine through the transmission and into the wheels.

In essence, the final drive ratio influences acceleration, top speed, and fuel efficiency. A higher final drive ratio (numerically) can result in better acceleration but may reduce fuel efficiency at high speeds. Conversely, a lower ratio may increase fuel efficiency on the highway but can lead to slower acceleration from a standstill.

Understanding the final drive ratio is essential for assessing how changes in performance will affect a vehicle's behavior, particularly if modifications are made, such as changing tire size or swapping differentials. This knowledge is foundational for making informed decisions regarding vehicle tuning and maintenance.