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