Gear ratio check

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 ,000 / 16,800= 3.57 or 3.57:1 gear ratio.
+Another Method
+An easy way to estimate the final drive is to use a calculator like the last one linked to below, "Determine Ratio" http://ctny.audiworld.com/mark/s4/gears/gear_calc.html .
+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.
+And Another Method
+. 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.
+. Measure a drive tire’s diameter in inches.
+. 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.
+. 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.
+Divide the figure produced in Step 3 by the number produced in Step 4 to determine the rear end gear ratio. In this example, 60,000 is divided by 16,800 to equal 3.57. Therefore, the rear end gear ratio is 3.57:1. 60,000 / 16,800= 3.57 or 3.57:1 gear ratio.
 ==Links==

Revision as of 07:16, 26 July 2011