One V8 and one six-cylinder in-line engine are available for the new BMW 6-Series Coupe from market launch, and both can claim unique features.

These power units are kitted out with BMW TwinPower Turbo technology, including High Precision Injection petrol direct injection, and stand out with their instantaneous power development, majestic in-gear acceleration, outstanding refinement and exemplary efficiency for their output class.

The eight-cylinder power unit in the new BMW 650i Coupe produces maximum output of 300 kW/407 hp from its 4.4-litre displacement between 5,500 and 6,400 rpm. This unique engine, whose turbochargers are positioned in the V-shaped area between the cylinder banks, produces an instantaneous and sustained wave of power, making it a feast for the enthusiast driver. Peak torque of 600 Newton metres (443 lb-ft) is served up between 1,750 and 4,500 rpm. The sporting performance attributes of the V8 engine enable the new BMW 650i Coupe to accelerate from 0 to 100 km/h (62 mph) in 4.9 seconds, leaving the engine electronics to call a halt to proceedings at 250 km/h (155 mph). And yet the range-topping model also demonstrates extraordinary efficiency for this output class, recording average fuel consumption of 10.4 litres per 100 kilometres (27.2 mpg imp) in the EU test cycle, together with CO2 emissions of 243 grams per kilometre.

The new BMW 640i Coupe is powered by a six-cylinder in-line engine in which the BMW TwinPower Turbo technology brings both direct injection and VALVETRONIC fully variable valve control to the table. This combination optimises both the responsiveness and efficiency of the 3.0-litre powerplant, which generates maximum output of 235 kW/320 hp at 5,800 rpm and puts its peak torque of 450 Newton metres (332 lb-ft) on tap between 1,300 and 4,500 rpm. The BMW 640i Coupe completes the sprint from rest to 100 km/h (62 mph) in 5.4 seconds, and its top speed is electronically limited to 250 km/h (155 mph). Average fuel consumption in the EU test cycle stands at 7.7 litres per 100 kilometres (36.7 mpg imp), while CO2 emissions come in at 179 grams per kilometre.

Standard-fitted eight-speed Sports automatic gearbox with steering wheel shift paddles; BMW 640i Coupe with Auto Start-Stop function.

Both the BMW 650i Coupe and BMW 640i Coupe transfer their power to the rear wheels via an eight-speed Sports automatic gearbox. This standard-fitted unit enhances sporty driving with exceptionally rapid gear changes, offers outstanding shift comfort and also optimises the efficiency of both model variants.

The innovative gear set configuration of the compact, low-weight automatic allows it to offer eight gears and a correspondingly wide gear spread. This not only enhances the car's sprinting ability, but also supports economical driving at low revs. With its minimal converter slip and impressive inherent efficiency, the eight-speed Sports automatic helps to ensure efficient power transmission. And the driver can also change gear manually using the shift paddles mounted on the steering wheel.

Extensive BMW EfficientDynamics technology also plays its part in cutting fuel consumption and emissions in the new BMW 6-Series Coupe. Among the systems fitted as standard are Brake Energy Regeneration, Electric Power Steering (EPS), the on-demand operation of ancillary components, intelligent lightweight construction and low-rolling-resistance tyres. The new BMW 640i Coupe is also fitted with automatic active air flap control and the Auto Start-Stop function. When the driver draws to a standstill at junctions or in a traffic jam, the engine is automatically switched off to prevent unnecessary fuel consumption at idle. As soon as the driver releases the brake pedal, the engine starts up again. If the driver is using the Auto Hold function, the engine is restarted when the accelerator is depressed.

Another innovation also helps smooth the way to particularly low fuel consumption while on the move. A touch of the Drive Dynamic Control button allows BMW 640i Coupe drivers to activate ECO PRO mode and unlock additional efficiency-boosting potential. ECO PRO mode tweaks the engine management, the accelerator mapping and the shift characteristics of the automatic gearbox to favour a consciously relaxed and frugal driving style at low engine revs. At the same time, efficient power usage for electrically operated functions such as the climate control system and the seat and exterior mirror heating ensures extremely efficient in-car energy management. Special readouts in the instrument cluster and Control Display keep the driver informed on the levels of energy efficiency currently being achieved, as well as keeping a record for the journey up to that point, and encourage a driving style that minimises fuel consumption. For example, the increase in range achieved by using ECO PRO mode is shown in kilometres.