By February 24, 2012 Read More →

BMW 640d xDrive arrives in the spring

BMW is set to add another variant to the BMW 6 Series line-up with the arrival of the BMW 640d xDrive Coupe and Convertible in spring 2012. Intelligent all-wheel drive teams up with a six-cylinder in-line diesel engine featuring BMW TwinPower Turbo technology to take driving pleasure to another new level. The new BMW 640d xDrive Coupe accelerates from 0 to 100 km/h (62 mph) in just 5.2 seconds. The 313 hp diesel powerplant uses BMW TwinPower Turbo technology to ensure outstanding efficiency, and joins forces with the standard-fitted eight-speed Sports automatic gearbox to deliver exceptionally low fuel consumption and emissions.

The xDrive system distributes the power generated by the engine precisely between the front and rear wheels as the situation demands. Pulling the strings behind the scenes is an electronic control unit which links xDrive up with the DSC (Dynamic Stability Control) system to ensure unbeatable traction, maximum safety, top-class handling and optimum power development in all weather and road conditions. The average fuel consumption of the BMW 640d xDrive Coupe stands at 5.7 – 5.8 litres per 100 kilometres / 48.7 – 49.6 mpg imp (in the EU test cycle, depending on the tyre format), while CO2 emissions are 149 – 153 grams per kilometre.

The latest multi-stage turbocharging technology responds more precisely than ever to the demands of different driving situations. At low revs a smaller turbocharger is activated, its low moment of inertia allowing it to go to work extremely rapidly. The compressed air from this small charger is sent directly to the combustion chambers via a bypass line. As the air no longer flows through the large charger, loss-free development of charge pressure is assured. Only when the driver asks for more power do the electronics prompt the bypass unit to bring the larger turbo into play. Added to which, variable turbine geometry for the smaller of the two turbos optimises the effectiveness of the turbocharging system in responding to the power requirement at any one time.

The result is an ultra-fast response to every movement of the accelerator. The engine delivers its peak torque of 630 Newton metres (465 lb-ft) as low down as 1500–2500rpm, with maximum output generated at 4400rpm. Powerful acceleration from a standstill and dynamic mid-range sprints are therefore dispatched with equal ease. The eight-speed Sports automatic gearbox is tuned precisely to the performance characteristics of the engine, and so allows the driver to exploit its impressive torque – maintained across a high rev band – to the full, for a sporty yet smooth driving experience.

The Driving Experience Control switch can be used to call up SPORT, SPORT+ and COMFORT modes, and – if the optional Dynamic Damper Control or Adaptive Drive are selected – COMFORT+. As well as the accelerator progression, engine responses, power steering characteristics, intervention thresholds of the DSC stability control system and shift dynamics of the automatic transmission, this also allows the driver to adjust the damper settings and anti-roll control. Whichever mode he chooses, the driver is activating a pre-configured and coherent overall set-up which includes reproduction of the engine sound. Here, a sound module is used to enhance the engine’s natural acoustic components to suit the driving situation and the Driving Experience Control mode selected, and this soundtrack is then transferred into the interior. The system’s digital signal processing technology exchanges data directly with the engine management and adjusts its output to the engine’s revs, the amount of torque being produced and the car’s speed over the road. This gives the driver an impressively accurate impression of how hard the engine is currently working and of the power being unleashed, and provides an even clearer window into the car’s responses on the road

 

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