In adverse conditions (i.e., when there is variation in grip between front and rear), a maximum of 67-80% (depending on the transmission, or model of Torsen diff) of the engine's torque can be directed to the front or rear axles. Under 'normal' conditions (where grip in both front and rear axles is equal), torque is split between front and rear with a 'default' 50:50 distribution in many, though not all, versions. This allowed engine torque to be automatically directed to individual axles as driving conditions, and grip warranted. After 1987, Audi replaced a manually locking centre differential with the Torsen (torque sensing) Type 1 ('T1') centre differential.
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