Gear Ratio Calculation
WARNING: This page is about a different car, the 2018 Audi S7, 2017 Audi S7, and 2016 Audi S7. However, it is still accessible from the selected car via links, so may be relevant.
Example:
| - | 7th Gear | Final Drive | Gear Wheel |
|---|---|---|---|
| Drive Gear | ZG1 = 52 | ZA1 = 29 | ZS1 = 31 |
| Driven Gear | ZG2 = 27 | ZA2 = 8 | ZS2 = 35 |
| i = Z2 : Z1 (Z1 = Number of teeth on the drive gear, Z2 = number of teeth on the driven gear) | |||
| iG = gear ratio = ZG2 : ZG1 = 27 : 52 = 0.519 | |||
| iA = axle ratio = ZA2 : ZA1 = 29 : 8 = 3.625 | |||
| iS = Helical gear ratio = ZS2 : ZS1 = 35: 31 = 1.129 | |||
| itotal = total ratio = iG x iA x iS = 0.519 x 3.625 x 1.129 = 2.872 | |||