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Old 11-15-2006, 03:41 PM
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BMW X5 #5

World debut: data transfer via FlexRay.
The FlexRay high-speed data transmission system is used for the first time in the industry for fast and reliable coordination of all AdaptiveDrive functions. FlexRay has been enhanced to production standard by a consortium of development companies under the leadership of BMW. This system offers a level of data transfer capacity never seen before. The new BMW X5 is the first vehicle in the world to feature FlexRay technology.

Wheels, tires and brakes: keeping the X5 rolling
BMWs evolving standards are clearly evident in the wheels, tires and brakes on the new X5. All three factors play significant roles in the ride, handling and safety of the new SAV, so all three received significant attention in the new vehicles design.

Compared to the predecessor X5 models, the brakes themselves are evolutionary, with ventilated cast-iron rotors all around on both models. The previous X5 3.0i had ventilated front discs and solid rear discs. In comparison to previous models, braking power has been enhanced by larger diameters:
X5 3.0si: Compared to 06 X5 3.0i, rear discs upgraded from 324 mm/12.8 in. solid to 320 mm/12.6 in. ventilated.
X5 4.8i: Compared to 06 X5 4.4i, front discs up from 332 mm/13.1 in. to 348/13.7; rear discs up from 324 mm/12.8 in. to 345/13.6. 4-wheel ventilated discs then and now.

Like the rest of BMWs 2007 lineup, the X5s Dynamic Stability Control now includes a range of new braking features: Brake Drying, Brake Stand-by, Brake Fade Compensation and Start-off Assistant. These are in addition to the previously standard Hill Descent Controland trailer stabilization, which have been a part of the X5s DSC since the vehicles introduction.

Maintaining a BMW tradition, each model offers standard or Sport Package wheel-and-tire equipment. Both models now come standard with 18-in. wheels and tires, whereas the previous X5 3.0i had standard 17-in. equipment. Sport Packages for both models include 19-in. wheels with all-season tires (previously 18-in.). In addition, the new 4.8i offers 20-in. equipment as an option in combination with its Sport Package.

Every 07 X5 also comes with BMWs run-flat system, which consists of self-supporting tires and wheel rims shaped to help keep a flat tire securely in place. The run-flat system has been further developed for the more-severe driving conditions appropriate to the versatile X5. These tires allow continued driving at speeds up to 50 mph on a completely flat tire for up to 90 miles, depending on the vehicle load.

Another element of the new X5 tire/wheel equipment is the new Tire Pressure Monitoring system. Pressure in each individual tire is measured directly and monitored via telemetry. If pressure in any tire drops by 25% or more, this is indicated to the driver by a warning in the instrument cluster.

xDrive: enhancing X5s traction and agility, now even more effectively
Like other current all-wheel-drive BMWs, the new X5s incorporate BMWs advanced xDrive all-wheel drive and traction system. xDrive operates as follows:
Driving torque is always transmitted to the rear wheels, and most of the time to all four wheels. Normal torque split is 60% rear/40% front.
The portion of torque transmitted to the front wheels is controlled by a multi-disc clutch that can be fully open, fully engaged or at any level of partial engagement in between. The torque split between rear and front wheels is thus steplessly variable.
Engagement pressure on the multi-disc clutch is directed by an electronic control system in response to actual road and driving conditions.

xDrive does more than optimize traction; it can also enhance both agility and stability on grippy as well as slippery road surfaces. Via the same type of logic that DSC employs to recognize and correct for excessive over- or understeer, xDrive adjusts the front/rear torque split to avoid these tendencies. If the system senses undesirable oversteer, it closes the multi-disc clutch completely, sending the maximum possible torque to the front wheels. In the case of excess understeer, xDrive opens the clutch completely, sending no driving torque to the front wheels.

The new X5 debut marks a significant evolution in xDrive capabilities, which has always depended upon a networking of Dynamic Stability Control and the xDrive system. Within the overall Integrated Chassis Management system, previously the engine and brake interventions of DSC operated essentially independently of the front-to-rear management of xDrive. Now all three control circuits work in parallel. This refined interaction achieves even quicker reactions to changing driving conditions and enhances xDrives already outstanding handling dynamics.
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