Gear ratio check
(→Optional Methods) |
(Clean up, format, add link.) |
||
| Line 18: | Line 18: | ||
This is much easier with 2 or 3 people. | This is much easier with 2 or 3 people. | ||
| − | ==Optional | + | ==Optional methods== |
| − | + | ;First method: | |
If there is a removable cover on the differential you can count the teeth on the ring and pinion gears. | If there is a removable cover on the differential you can count the teeth on the ring and pinion gears. | ||
Count the teeth on the pinion and ring gears. Then divide the number of teeth on the pinion into the number of teeth into the ring gear and you have the ratio. | Count the teeth on the pinion and ring gears. Then divide the number of teeth on the pinion into the number of teeth into the ring gear and you have the ratio. | ||
| − | + | *For example: | |
| − | For example: | + | |
41 divided by 10 = a 4.10 ratio | 41 divided by 10 = a 4.10 ratio | ||
| Line 32: | Line 31: | ||
| − | + | ;Second method: | |
| − | + | ||
| − | + | ||
'''1.''' Drive the vehicle at a steady speed. Note the RPM. | '''1.''' Drive the vehicle at a steady speed. Note the RPM. | ||
| − | For example, if the vehicle is driven at 50 mph, and at that speed the tachometer reads 2,000 RPM, record that the engine speed was 2,000 RPM at 50 mph. | + | ::For example, if the vehicle is driven at 50 mph, and at that speed the tachometer reads 2,000 RPM, record that the engine speed was 2,000 RPM at 50 mph. |
| − | + | ||
'''2.''' Measure a drive tire’s diameter in inches. | '''2.''' Measure a drive tire’s diameter in inches. | ||
'''3.''' Multiply the RPM by the diameter of the tire. | '''3.''' Multiply the RPM by the diameter of the tire. | ||
| − | For example, if the diameter of the tire was 30 inches, 30 multiplied by 2,000 equals 60,000. | + | ::For example, if the diameter of the tire was 30 inches, 30 multiplied by 2,000 equals 60,000. |
| − | + | ||
'''4.''' Multiply the speed at which the vehicle was driven by 336. | '''4.''' Multiply the speed at which the vehicle was driven by 336. | ||
In this example, the vehicle was driven at 50 mph. So, 50 is multiplied by 336 to equal 16,800. | In this example, the vehicle was driven at 50 mph. So, 50 is multiplied by 336 to equal 16,800. | ||
| Line 49: | Line 44: | ||
60,000 / 16,800= 3.57 or 3.57:1 gear ratio. | 60,000 / 16,800= 3.57 or 3.57:1 gear ratio. | ||
| − | |||
| − | Another easy way to estimate the final drive is to use a calculator | + | ;Third method: |
| + | Another easy way to estimate the final drive is to use a [[http://ctny.audiworld.com/mark/s4/gears/gear_calc.html ratio calculator]]. | ||
| − | Drive the vehicle at 50 MPH (as an example), note and enter the speed (50 mph), the RPM (what ever you noted), and for the final drive, enter 1. When you hit calculate, the rear gear ratio estimate will come up. | + | Drive the vehicle at 50 MPH (as an example), note and enter the speed (50 mph), the RPM (what ever you noted), and for the final drive, enter 1 into the calculator. When you hit calculate, the rear gear ratio estimate will come up. |
==Links== | ==Links== | ||
| − | + | [[http://ctny.audiworld.com/mark/s4/gears/gear_calc.html Gear ratio calculator]] | |
| − | [[http://ctny.audiworld.com/mark/s4/gears/gear_calc.html ratio calculator]] | + | |
[[Category:Rearend]] | [[Category:Rearend]] | ||
[[Category:Good articles]] | [[Category:Good articles]] | ||
Your Privacy Choices