| The Saab XWD "Cross Wheel Drive" system was | | | | The system is controlled by an electronic |
| developed in Sweden with Haldex of Stockholm | | | | control unit which functions in harmony with |
| and designed to provide optimum vehicle | | | | the engine, transmission, and ABS/ESP control |
| handling and stability in any type of driving | | | | modules. The hardware is consists of a Power |
| conditions. The same system is also equipped | | | | Take-off Unit (PTU) in the front final-drive |
| in the 2008 Saab Turbo X and Aero version of | | | | that transmits engine torque through a |
| the 9-3 Sport Sedan and SportCombi with high | | | | prop-shaft to the Rear Drive Module (RDM) |
| quality Saab strut mount and offered in | | | | that incorporates a Torque Transfer Device |
| combination with an enhanced 280hp (206kW), | | | | (TTD) and an electronically controlled |
| 2.8 V6 turbo engine made 15 percent more | | | | Limited Slip Differential (eLSD)-both are wet |
| powerful with maximum torque of 400Nm/295 lbs | | | | multi-plate clutch units from Haldex. |
| ft. | | | | |
| | | | When starting from rest, the TTD is activated |
| The Saab XWD "Cross Wheel Drive" system is | | | | when clutch plates are forced together under |
| offered in a choice of six-speed manual or | | | | hydraulic pressure engaging the RDM---this is |
| automatic transmissions. It also includes two | | | | also considered as the pre-emptive function |
| unique features the pre-emptive engagement of | | | | and its vital for the improvement in current |
| the rear wheels that optimizes the traction | | | | technology which calls for the detection of |
| at take-off and an active rear limited-slip | | | | wheel slip before the TTD is set off. The |
| differential (eLSD) that allows variable | | | | pre-emptive function also provides maximum |
| torque transfer between the rear wheels. | | | | traction for smooth and strong acceleration |
| | | | even when vehicle starts from rest. |
| In addition, the XWD system is a | | | | |
| fully-automatic, on-demand system that is | | | | Once on the road, drive torque remains |
| capable of sending up to 100 percent of the | | | | flawless and varied between the axles |
| engine torque to the front or the rear wheels | | | | controlled by the valve in the TTD. This |
| whenever it is required. Aside from offering | | | | increases or reduces the pressure on the wet |
| owners of Saab Turbo X and 9-3 Aero XWD with | | | | clutch plates. The Saab XWD is simply |
| efficient handling in conditions where | | | | remarkable when it comes to cornering since |
| gripping power is required, it's highly | | | | it provides a balanced and a more efficient |
| sophisticated operation also helps in | | | | chassis dynamics. Furthermore, the data from |
| enhancing driving experience in various road | | | | the vehicle's ABS/ESP sensors that measures |
| conditions. The perfect balancing of the | | | | wheel speed, steering angle and yaw rate |
| drive torque between the front and the rear | | | | together with highly sophisticated |
| wheels increases the limit that triggers the | | | | programming of the XWD enables the |
| ESP throttle and braking interventions which | | | | application of the rear drive that balance |
| in turn more options for driver involvement. | | | | oversteer and understeer thereby improving |
| | | | stability and road grip. |