Gear ratio check
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'''Another Method''' | '''Another Method''' | ||
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An easy way to estimate the final drive is to use a calculator like the last one, "Determine Ratio" http://ctny.audiworld.com/mark/s4/gears/gear_calc.html . | An easy way to estimate the final drive is to use a calculator like the last one, "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 (55 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 (55 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. | ||
| − | '''Another Method''' | + | '''And Another Method''' |
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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. | ||
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60,000 / 16,800= 3.57 or 3.57:1 gear ratio. | 60,000 / 16,800= 3.57 or 3.57:1 gear ratio. | ||
| − | '''Determining Transmission | + | '''Determining Transmission Ratios''' |
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A way you can get a ballpark figure for what the '''transmission ratio''' is - if the car is driveable, and has an accurate tachometer and speedometer- is to drive the car at 1000 RPM (you can use a different RPM and convert it easily) in whatever gear is 1:1. Note the speedometer reading. Put it in whatever gear that you want to know the ratio of and drive at the exact same speed. Note the tach reading. If you move the decimal point three places to the left, that's your low gear ratio. | A way you can get a ballpark figure for what the '''transmission ratio''' is - if the car is driveable, and has an accurate tachometer and speedometer- is to drive the car at 1000 RPM (you can use a different RPM and convert it easily) in whatever gear is 1:1. Note the speedometer reading. Put it in whatever gear that you want to know the ratio of and drive at the exact same speed. Note the tach reading. If you move the decimal point three places to the left, that's your low gear ratio. | ||
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