Calculating overall drive ratio (i)
WARNING: This page is about a different car, the 1999 Volkswagen GTI, 1998 Volkswagen GTI, 1997 Volkswagen GTI, 1996 Volkswagen GTI, and 1995 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.
CALCULATING OVERALL DRIVE RATIO (EXAMPLE)
| Gear | 5th gear | Final drive |
|---|---|---|
| Drive gear | ZG1 = 37 | ZA1 = 18 |
| Driven gear | ZG2 = 31 | ZA2 = 61 |
i = Z2 : Z1 (Z1 = Number of teeth on drive gear Z2 = Number of teeth on driven gear.)
iG = Gear ratio = ZG2 : ZG1 = 31 : 37 = 0.838
iA = Gear ratio = ZA2 : ZA1 = 61 : 18 = 3.389
Overall ratio i = total ratio = iG x iA =0.838 x 3.389 = 2.840