Audi Workshop Service and Repair Manuals > A3 Mk2 > Power transmission | Direct shift gearbox 02E, four-wheel drive | Technical data | Code letters, gearbox allocation, ratios, equipment

Calculating ratio “i”

Example:

i = Z₂ : Z₁ (Z₁ = number of teeth on drive gear, Z₂ = number of teeth on driven gear)

i_G = gear ratio = ZG₂: ZG₁ = 33 : 40 = 0.825

i_A = axle ratio = ZA₂ : ZA₁ = 72 : 20 = 3.6

i_ov = overall ratio = i_G x i_A = 0.825 x 3.6 = 2.97

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