Control Module: Description and Operation

Fig. 1 AWD Component Locations:

The 911 is equipped with electronically controlled four wheel drive system. Front wheels are driven by a transfer box and a driveshaft running in the central pipe. The four wheel drive system has a permanent division of 31% of the drive torque to the front axle and 69% to the rear axle. The static axle load distribution is 60% to the rear axle and 40% to the front axle. The transverse lock is applied to reduce oversteer while driving the car in curves. The interaxle lock stabilizes the vehicle when accelerating out of a curve, sends more drive torque to the slower turning axle by locking the transfer. The locking effect is increased until equal wheel speeds are restored.
Refer to Fig. 1, for all wheel drive component locations.