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Vehicle Dynamics and Driver Assist Systems
May 2017
Super Sport ABS
Introduced with the 2004 Impreza WRX STi, a Super Sport ABS system was added to improve
vehicle stability while under heavy braking. In the Super sports ABS system, brake fluid
pressure control for the rear wheels is switched to independent control while turning. This
design helps to increase the cornering force of the front wheels to reduce under steer.
STi Rear Brakes
Active Torque Vectoring (ATV)
Introduced with some 2015 MY models an Active Torque Vectoring system was introduced to
help enhance vehicle handling performance when cornering. The system monitors steering
angle, accelerator pedal, lateral G, longitudinal G, and yaw rate of the vehicle to detect an
understeer condition. When understeer is detected, the system will apply brake pressure
independently to the inside cornering front wheel. This action results in higher torque being
transferred to the outside wheel which creates a more neutral steering force for the driver and
their intended path.
Active Torque Vectoring
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