seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

ABOUT US
General instructions for gearbox repairs > < Power transmission diagram

Leon Mk1

Calculation of the gear ratio “i”
Calculation of the gear ratio “i”
The gear ratio is obtained by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.
Example:
   
 5th gearDifferential
Driving gear (primary)47 (Z1 Primary)15 (Z1 Sprocket)
Driven gear (secondary)40 (Z2 Seondary)64 (Z2 Crown)

i = Z2 : Z1
In this way we can find out:
iG = Gear ratio of a gear
iG =
Z2 Seondary
Z1 Primary
=
40
47
= 0,851
iA = Gear ratio of the differential
iA =
Z2 Crown
Z1 Sprocket
=
64
15
= 4,267
Itotal = Total gear ratio
Is obtained by multiplying the gear ratios of the longest gear and the differential.
itotal = iG x iA = 0.851 x 4.267 = 3.631
   

General instructions for gearbox repairs > < Power transmission diagram