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General repair instructions > < Transmission layout

A3 Mk2

Calculating ratio “i”
Calculating ratio “i”
Example:
   
 6th gearFinal drive
Drive gearZG1 = 48ZA1 = 17
Driven gearZG2 = 31ZA2 = 74

i = Z2 : Z1 → Note
iG = gear ratio = ZG2 : ZG1 = 31 : 48 = 0.646
iA = axle ratio = ZA2 : ZA1 = 74 : 17 = 4.353
iov = overall ratio = iG x iA = 0.646 x 4.353 = 2.811
1)  Z1 = No. of teeth on drive gear, Z2 = No. of teeth on driven gear
   

General repair instructions > < Transmission layout