Victoria Scott is a freelance writer, photographer, author, and cat mom who lives in Seattle. She is a leading industry expert in catastrophically breaking her vehicles while off-roading. Her proudest moment behind the wheel was completing Mission 34 in Gran Turismo.
If you’ve ever shopped for a sports car, you’ll often hear the term “limited-slip differential” ; you’re probably aware that it’s better than not having one, but it can be unclear exactly what it does. In Mad-Man-esque ad terms, Chevrolet proclaimed that cars with “Positraction” limited-slip differentials offered “protection from swerve on bumpy roads” and “positive pulling power in mud and snow” which… doesn’t make anything clearer, admittedly.
works by coupling an electromagnetic solenoid to a hydraulic clutch and attaching that to the output axles; the solenoid increases pressure on the necessary clutch when the car’s ECU senses wheelslip. This pressure increases the resulting torque on the gripping wheel’s output shaft, same as a traditional limited-slip.
used this ability to send extra power to the outer wheel—the one that was spinning faster already—in hard cornering, to create positive steering input and actively yaw the car through the corner. The next evolution came with fully electronic torque vectoring, such as in Lexus’s Torque Vectoring Differential , which uses a brushless electric motor to vary the pressure applied to a clutch pack and change power output.
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