What is final drive ratio?

What is final drive ratio?

The final drive ratio is the last bit of gearing between your transmission and the driven wheels. By changing it, you can affect the performance of your car, rather dramatically in some cases. In general, a lower final drive ratio will lead to less torque at the wheels but a higher top speed.

How is final drive ratio calculated?

By simply dividing the ring gear tooth count by the pinion gear tooth count, the ratio is determined. For example, if we divide a ring gear with 41 teeth by a pinion gear with 10 teeth we find that the gear ratio is 4.10:1 (41/10 = 4.10). Tire diameter will also have an effect on a vehicle’s final drive ratio.

How is drive ratio calculated?

To calculate the gear ratio: Divide the number of driven gear teeth by the number of drive gear teeth. In our example, it’s 28/21 or 4 : 3. This gear ratio shows that the smaller driver gear must turn 1,3 times to get the larger driven gear to make one complete turn.

What do diff gear ratios mean?

Gear ratios can be boiled down to a single statement: Higher ratios (with a lower numerical value) give better torque/acceleration and lower ratios allow for higher top speeds and better fuel economy. Higher ratios mean the engine has to run faster to achieve a given speed.

Is final drive ratio the same as axle ratio?

Final drive ratio and axle ratio are one and the same. “Final drive” refers to the last set of gears that power goes through before it gets to the wheels. Bye bye, Bumblebee! Final drive ratio and axle ratio are one and the same.

How do I know my axle ratio?

Method 1: Count the number of teeth on the ring gear and the pinion. Divide the number of the ring gear’s teeth by the number of the pinion’s teeth. This will give you the axle ratio.

What does a 4.10 gear ratio mean?

If the 4.10 ratio applies to the rear end gears in a car, it means the car’s driveshaft turns 4.1 times for ever one revolution of the rear tires.

How does final drive ratio affect performance?

The final-drive ratio is the extent to which the rotating speed of the driveshaft (output) from the gearbox finally reduces before it reaches the driven wheels. If you alter this ratio, it also alters every gear’s effective ratio, thereby affecting the vehicle performance and economy.

What is the final drive ratio of a Lexus IS F?

The IS F and LS 460 (with sport package) use Sport Direct Shift (SPDS) which allows for faster shift times. The torque converter can lockup from 2nd to 6th gears. Final drive ratio is 2.937. 8-speed automatic 4WD transmission. Same gear ratios as the AA80E but a shorter 3.133 final drive ratio is used.

What is the gear ratio in a car?

This ratio means that the driver gear must make 1.62 revolutions to turn the driven gear once. It also means that for every one revolution of the driver, the driven gear has made 1/1.62, or 0.62, revolutions. Essentially, the larger gear turns more slowly.

What is the final gear ratio between idler and third gear?

The gear ratio between the idler and third gear is thus 42/21, or 2:1, and hence the final gear ratio is 1.62×2=~3.23.