Mazda Speed 6. Manual — part 8

03 DRIVELINE/AXLE

34

All Wheel Drive (AWD)

Front/rear wheel torque varies between 100/0 and 50/50 through an electronic
torque coupling mounted in front of the rear differential

100/0 is only used when the hand brake is applied or at low speeds during
tight turns (parking lot maneuvers)

Many AWD systems in FWD cars require front wheel slip (viscous couplings)
before power is transferred to the rear, MAZDASPEED6 has a strong rear
wheel bias in most driving conditions

Almost constant torque to the rear requires a water cooled transfer unit

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Water cooled

Water cooled
transfer unit

transfer unit

3-piece steel

3-piece steel
drive shaft

drive shaft

Electronic

Electronic
Control Coupling

Control Coupling

Tochigi-Fuji

Tochigi-Fuji
Limited Slip

Limited Slip
Differential

Differential

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35

The 4WD ECU uses real-time data to manage torque.

PCM: VSS, RPM, TP angle, neutral switch, brake pedal position, selector
lever position
DSC: 4-wheel speed sensors, parking brake switch, ABS activated, steering
wheel angle, brake fl uid pressure, back-up light, coupling torque request, yaw
rate, and lateral G-force
Rear Differential: oil temperature

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03 DRIVELINE/AXLE

36

Transfer Unit

Water Cooling

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37

Torque always goes to the front wheels and the rear drive shaft.