For 2015, select Subaru models feature a new yaw-control system called Active Torque Vectoring (ATV). This new technology makes handling more precise and enhances your vehicle’s agility while cornering by using the braking system to help turn the vehicle. With ATV, you can push your Subaru to new levels of performance while also enjoying a heightened sense of command while driving.
Automatic for the People
ATV achieves all this by applying slight brake pressure to the inside front wheel automatically as you begin accelerating out of a corner. This effectively reduces cornering understeer that tends to occur due to front-rear vehicle weight imbalance when cornering.
While the technology works transparently, under certain specific conditions its assistance may be slightly detectable to the driver, such as when the driver is at the lateral grip limit of the tires, and then accelerates. ATV also is not active during braking.
ATV operates as an integrated component of the Vehicle Dynamics Control (VDC) system to help to improve overall turning and handling performance.
Paddle shifters can be used to slow down instead of braking.
Here’s how VDC works: The VDC system calculates the driver’s desired trajectory by detecting and evaluating a combination of the steering angle, engine speed, selected gear, and braking conditions. VDC monitors and analyzes whether or not the vehicle is following the driver’s intended course via these sensors. If the vehicle approaches the limits of stability while cornering or avoiding an obstacle, the All-Wheel Drive (AWD) torque distribution, engine output, and brakes at each wheel automatically compensate to assist in keeping the vehicle on course. All this happens in an instant, without hindering the driving experience for the driver, and while helping to maintain a higher level of safety for the driver, the passengers, and the vehicle itself.
From the Racetrack to the On-Ramp
The VDC stability system was developed and honed on the track, but with the everyday driver in mind. The VDC system includes three modes – Normal, Off, and Traction, a performance driving mode that disables stability and traction control but retains the torque-vectoring function to better follow a driver’s intended path. Traction mode is especially popular with those who prefer to have a higher level of manual control over their vehicle while still enjoying the enhanced handling provided by ATV.
Turing the VDC "off" improves the
ability to get out of deep snow.
Drivers also have the option of a “VDC Off” switch to turn off the stability and traction control for driving in or extricating the vehicle from deep snow or mud. Under such conditions, the selective braking action that a stability or traction control system provides can be more of a hindrance than a help, so Subaru lets you turn it off until you get back on track. But even with VDC off, the AWD system operates at all times, and the standard viscous limited-slip rear differential comes in handy when you need to free the vehicle from deep snow or mud.
Subaru is in Your Corner
The culmination of all this seamless technology is an unprecedented level of control for the driver, a new authority when cornering – even under adverse conditions – and a safer driving experience overall.
Read about the role of Active Torque Vectoring in the handling of the all-new 2015 WRX STI.