final drive ratio meaning

The optimum gear ratio n can be calculated using Eq. Overall the final drive ratio of your truck has a minor impact on fuel economy compared to other factors such as low tire pressure overuse of air conditioning an inefficient or neglected engine and frequent rapid acceleration.

How To Figure Out The Gear Ratio Of Your Car Yourmechanic Advice

Choosing your right gearing is all about compromise.

. These refer to the gear ratio in the differential. 282 rpm to 1 rpm 2821. 210 As the arm extends the effective load inertia increases from 075 to 2 kg m2.

As of 2019 a 41 axle ratio from the factory shouldnt cost much more than 50. So if you have a final ratio of say 411 then that means that the for every 41 turns of the drive shaft the rear wheels will do one full turn. How Changing Your Final Drive Ratio Can Make Your Car Quicker.

You could stick a final drive in your car that was so big it would create a poop load of torque. The final drive is an assembly of gears in the back axle of rear-wheel drive with engine power going to the rear wheels vehicles and in the front axle of front-wheel drive with engine power going to the front wheels vehicles. By making changes to your spur and pinion gears you can influence your cars speed of acceleration and top end speed.

And over the years Nissan have worked hard to reduce the weight of the car while modifications such as blanking the fog lamp sockets low rolling resistance tyres and reworking the final drive ratio all helped Pure Drive models deliver great economy and emission figures. The last set of gears in the drive train is the final drive. A 290 gear ratio means the drive shaft turns 29 times in one full turn of the rear wheels.

When the final drive comes on the axle the rotating wheels have to move at different. Definition of final drive. Taller gears allow.

This is known as the final drive differential gear Crown Wheel Pinion CWP or ring and pinion. So if you have an 80 spur and 20 pinion your final drive is 4. With a transmission its the same but with one more step.

You may have heard terms like rear axle ratio or final drive ratio. See How Gears Work for more information on gear ratios. Tire size also plays a.

Rear end gear ratios or final drive ratio refers to the number of revolutions the drive shaft turns compared to one full revolution of rear wheels. I read one definition saying its the turns of the engine to the turns of the wheel but that only proves to me that for instance if the final drive ratio was 101 with a car that redlines at 5000rpm then the wheels can turn at a max of 500 rpm thereby limiting top speed. A larger final drive ratio means a steeper acceleration curve but youll top out sooner.

The means for transmitting power from the propeller shaft to the rear axle in an automotive vehicle. A cars gearing is all about compromise. The larger the final drive number the faster the acceleration.

When a car makes a turn the wheels must spin at different speeds. In a final drive ratio of 3551 for example the driveshaft must turn 355 times before the axle will turn once. To figure out the final drive number do the math.

Final Drive Ratio. Youd be running 10s except that youd top out at 7k rpm in 5th at 50 mph. Spur divided by pinion.

The number of teeth on the ring and pinion gears determine the ratio. So does final drive ratio mean that wider ratios 373 lower top speed. The rear gear ratio is 282 rpm of the drive shaft to 1 rpm of the tire.

Besides the gears in the transmission there is also a gear in the rear differential. The list of abbreviations related to FDR - Final Drive Ratio. The final drive determines the ratio of how many revolutions the driveshaft makes to turn the rear differential or tires one turn.

Final drive ratio Definition from Encyclopedia Dictionaries Glossaries. The final drive dictates the ratio of every gear before its transferred to the wheels. The lower the number the more top end it will have.

The gear ratio has limiting. Final drive for a 11 car is easy. A lower taller gear ratio provides a higher top speed and a higher shorter gear ratio provides faster acceleration.

Spur divided by pinion times trans ratio. But it can also reduce your top speed and fuel economy. The final drive ratio is what you end up with when you factor in the transmission and transfer case gearing and the axle gear ratio.

Spur Pinion Trans. You have to have a. The gear ratio is to be considered the optimum value as defined by Eq.

If the final drive ratio is 410 then the ring gear has 410 times as many teeth as the input pinion gear. If you call out a ratio by using one number 282 it is understood that the number you are comparing it to is 1 of the same unit. So an 80 divided by 20 is 4 times 26 gives a final drive of 104.

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