BMW 550I GRAN TURISMO BROCHURE 201 Service Manual download pdf (Page 20)

Sudden showers, roads covered in wet leaves or snow – conditions that usually make driving

difﬁ cult are easily overcome by  Series Gran Turismo models with xDrive intelligent all-wheel

drive. This system combines the athletic handling of the  Series Gran Turismo with the beneﬁ ts

of a lightning-fast all-wheel-drive system. The result: a noticeable increase in the vehicle’s already

impressive traction and road-holding capabilities, even in inclement weather or on challenging road

surfaces. BMW’s xDrive intelligent all-wheel drive constantly evaluates the vehicle’s electronic data,

such as wheel rotation speed, steering angle, yaw rate and engine torque, to determine whether

the vehicle is accurately reproducing the directions provided by the steering wheel, or whether it

is tending to oversteer or understeer. Based on this data, xDrive seamlessly divides drive power

between the front and rear axles. When cornering, if the front wheels slide towards the outside

of the bend – that is, if the vehicle threatens to understeer – the electronically controlled multi-

plate clutch transfers drive power from the front to the rear wheels in the blink of an eye, thus

preventing understeering before it even happens. You can enjoy the dynamic performance of

the BMW  Series Gran Turismo to the fullest, in any situation.

While you drive, xDrive is constantly assessing

data provided by the vehicle sensors, such as

wheel rotation speed, steering angle, yaw rate

and engine torque. So the system always

knows when to intervene and can instantly

adjust the distribution of drive power between

the front and rear axles to best suit the current

driving situation.

BMW’S xDRIVE INTELLIGENT

ALL-WHEEL DRIVE HELPS YOU

STAY IN CONFIDENT CONTROL.

Power split between rear axle front axle

Driving Dynamics Control. Gives the

 Series Gran Turismo a handling and per-

formance attitude adjustment at the push of

a button on the console. Choose from four

settings,

COMFORT, NORMAL, SPORT and

SPORT+, to adjust engine-throttle response,

transmission shift char acteristics and power-

steering assist. In addition, the traction control

feature can be disengaged when driving on

sand, gravel, or deep or packed snow.

When BMW engineers develop the suspension and steering systems of any new vehicle, they

pursue two seemingly contradictory goals: the driver must be able to feel a direct contact with

the road, while passengers are buffered from rough road surfaces. It’s this delicate balance

that produces the unparalleled BMW driving feel, and why we use proven design concepts,

such as rear-wheel drive and near-perfect  ﬁ / ﬁ weight distribution. The advanced suspension

technology in the  Series Gran Turismo adds to both its exceptional level of ride comfort and

its uniquely agile handling for a luxury vehicle. In front, multi-link, double-pivot spring-strut

technology reduces damaging longitudinal and lateral forces, while simultaneously increasing

contact with the road. The integral, multi-link self-leveling rear suspension uses air pressure to

maintain a comfortable ride whenever sensors recognize changes in vehicle load or ride height,

or if one of the rear tires suffers a loss of pressure.

Adaptive Drive. Adaptive Drive combines

performance-elevating Active Roll Stabilization

(ARS) and ride-enhancing Dynamic Damping

Control (DDC). The vehicle’s body tends to

roll in corners, affecting handling. ARS twists

special two-piece anti-roll bars to generate

stronger resistance to body roll, keeping the

vehicle more level and providing maximum

stability and agility. DDC, on the other hand,

instantly adjusts shock absorbers from the

softest to the  rmest settings. The result is

exceptional ride comfort and ﬂ uid handling at

all times – during changes in vehicle speed,

load or road and driving conditions.

Integral Active Steering. With Integral

Active Steering, at speeds up to  ﬁ mph,

a small turn of the steering wheel yields a

greater turn of the front wheels for more

direct response. It also steers the rear wheels

up to three degrees in the opposite direction,

giving the effect of a shortened wheelbase for

enhanced maneuverability. When changing

lanes at speeds over   mph, both front and

rear wheels turn in the same direction, giving

the feel of an extended wheelbase. While

you experience greater responsiveness and

directional stability, your passengers enjoy

greater ride comfort from reduced body roll.

DESIGNED TO DELIVER

ONE OVERRIDING SENSATION:

DRIVING PLEASURE.

  mph and above

Up to  ﬁ mph

|  xDrive | Suspension | Driving technology

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BMW 550I GRAN TURISMO BROCHURE 201 Service Manual Page 20

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