Transmission gear ratio estimate
(Created page with ''''Estimating Transmission Ratios''' A way you can get a ballpark figure for what the '''transmission ratio''' is - if the car is drivable, and has an accurate tachometer and sp…') |
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'''Estimating Transmission Ratios''' | '''Estimating Transmission Ratios''' | ||
| − | A way you can get a ballpark figure for what the '''transmission ratio''' is - if the car is drivable, and has an accurate tachometer and speedometer | + | A way you can get a ballpark figure for what the '''transmission ratio''' is - if the car is drivable, and has an accurate tachometer and speedometer: |
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| + | '''1.''' Drive the car at 1000 RPM (you can use a different RPM and convert it easily) in whatever transmission gear is 1:1. | ||
Note the speedometer reading. | Note the speedometer reading. | ||
| − | Then put it in whatever gear that you want to know the ratio of, and drive at the exact same speed. | + | '''2.''' Then put it in whatever transmission 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 | + | Note the tach reading. If you move the decimal point three places to the left, that's your transmission ratio. |
| − | '''Example:''' If the tach says 3200 RPM, your ratio is 3.2:1. | + | '''Example:''' If the tach says 3200 RPM, your transmission ratio is 3.2:1. |
Also see '''[[Gear ratio check]]''' for estimating '''rear''' gear ratios. | Also see '''[[Gear ratio check]]''' for estimating '''rear''' gear ratios. | ||
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