The intelligent all-wheel drive system BMW xDrive that debuted in the BMW 650i now guarantees the utmost control and optimum acceleration as it is now used in the sporty 6-cylinder diesel models BMW 640d Coupé and BMW 640d Convertible.
Aside from the known advantages of all-wheel drive, xDrive with its electronic control system and very fast power distribution between front and wheels also ensures superior traction, safety, handling and application of engine power in all types of weather and road conditions.
What this means is that the 230 kW/313 bhp in-line 6-cylinder engine with BMW TwinPower Turbo Technology may become even more effective, especially since the torque maximum of 630 Nm is already offered in the range of 1,500 to 2,500 rpm.
BMW xDrive consistently runs on an anticipatory basis, making the vehicle stable when necessary even before the driver takes notice that he or she has to do something. A perfect combination of dynamic performance and comfort is the result of having an optimized set-up, increasing agility and precision on bends as well.
The xDrive system tuning has been optimised for the BMW 6 Series by considering its distinctive traits. This customisation is based on the tenet of amicably combining the classic BMW rear-wheel drive qualities with the advantages of power distribution to all four wheels. In typical BMW fashion for their rear-wheel drive cars, normally, there is a 60 percent engine power allocation to the rear axle and 40 percent to the front. However, this is instantly adjustable in order to comply with variations in conditions.
Linking up for proactive analysis and intervention accuracy.
Controlling power distribution with early and anticipatory calculation of traction loss risk minimises wheel spin for each wheel. This makes xDrive a truly smart all-wheel drive system.
This pre-emptive drive circumstance analysis takes consideration of the engine management system information, accelerator position, steering angle, wheel speeds and ICM-stored lateral acceleration. From this collective data, xDrive fastidiously manages front- and rear-wheel power distribution to maximise engine power output utilisation throughout.
xDrive is thus enabled to prevent over- or understeering, where other all-wheel drive systems would only respond during occurrence of wheel spin at one or more wheels. When understeering is anticipated, more drive power is proportionately and quickly directed to the rear wheels. Sharper corner entry turns are then enabled. Simply put, xDrive ensures improved stability even prior to the driver’s recognition for this need.
Likewise, the system's proactive nature pre-empts and rectifies oversteering tendencies well ahead of time by sending extra power to the front wheels. Therefore, the advantages of this all-wheel drive system are evident even prior to the occurrence of any traction loss.
Smart power distribution allocation also enhances ride comfort. xDrive’s improvement of stability means that DSC intervention is minimised only to extreme circumstances. For instance, in situations where the car cannot be kept on track only by drive power distribution optimisation, then the DSC will intercede by decreasing engine power and applying selective wheel braking.