Subaru's Symmetrical All-Wheel Drive

Subaru has long been known for its Symmetrical All-Wheel Drive (AWD) system. This system is different than other AWD systems out there for a few reasons and it comes standard on almost every new Subaru out there (all but the BRZ models). Besides coming standard with most models, what differentiates Subaru from the competition is in the efficiency of the AWD system.

Why is it called Symmetrical AWD? – Two Reasons:

1.       1) The power in a Subaru AWD System is split 50/50 between the front and back wheels during normal driving situations. As opposed to other systems, usually splitting the power with more going to either the front or the back wheels.

2.       2) The way that the weight is distributed in Subaru's system is almost completely symmetrical from side-to-side. This results in better body roll and more precise control of each wheel in the system.

Can you guess which one is Subaru's AWD System?

A.

B.

(Answer: B)

Subaru's Symmetrical AWD system is also different from other systems in the way it reacts to a loss of traction. Subaru's system continuously monitors traction and reacts instantly to a loss of traction. This is accomplished with a “Viscous Coupling Locking Differential” - which transfers power away from the wheels that are slipping and transfers more power to the wheels that have traction. This can result in up to an 80/20 torque split (from the normal 50/50 split).

Check out this video for more information and simulations: