Introducing XWD

The Saab Turbo X adds a new dimension in chassis control to Saab’s unrivalled experience in turbocharging. It is the result of a development program that leverages the full potential of Saab’s innovative XWD system, with the car’s sports tuned suspension, brakes and electronic control systems all aligned to meet a single need: driving satisfaction.

Saab XWD is an active all-wheel-drive system designed to optimize vehicle handling and stability. Its sophisticated electronic control allows fine balancing of drive torque, not only between the two axles but also between the rear wheels. In effect, this stretches the performance envelope of the chassis, for example, raising the threshold at which ESP throttle and braking interventions are triggered. The result is closer driver involvement through ‘positive force’ chassis control.

The driving benefits of the XWD system are best appreciated out on the open road. Data from the ABS/ESP sensors - measuring wheel speed, yaw rate and steering angle – is utilized by the Saab XWD control module. Rear drive is instantly applied to balance oversteer and understeer characteristics, improving stability and roadholding.

Driver control is taken a step further on the Turbo X by the eLSD, the first application of an electronically-controlled, rear limited slip differential in this segment of the market. It uses inputs from the rear wheel speed sensors and can transfer up to 40% of torque between the drive shafts, to whichever wheel has more grip. When cornering hard, this yaw damping effect helps the rear of the car more closely follow the direction of the front wheels.

To exploit the full benefits of Saab XWD, the chassis of the Turbo X has been lowered by 10 mm and the springs and dampers stiffened to minimize body movement. To maintain a constant ride height irrespective of load, self- leveling dampers are fitted at the rear.

Stopping power is also increased with larger brake discs fitted: internally ventilated (345 mm diameter x 30 mm) at the front and externally ventilated (292 mm diameter x 20 mm) at the rear. Standard 235/45 R-18 tires ensure excellent mechanical grip for the 18-inch alloy wheels.