Continuous development of the 4.4 litre V8 Bi-Turbo engine has resulted in a number of upgrades leading to a significant increase in power output. The engine now develops 441 kW (600 hp) at 6000 rpm and a maximum torque of 800 Nm between 3500 and 4500 rpm.
Two specifically constructed large diameter turbo-chargers operating in parallel are primarily responsible for achieving a high power and torque output over a very broad rpm range without sacrificing spontaneous throttle response at low rpm. The high-performance indirect inter-cooler system with a short intake system consists of a large-volume low-temperature inter-cooler and two engine-near inter-coolers. Additional oil and water coolers are located just behind the front spoiler and ensure the overall thermodynamic efficiency of the engine. Extensive optimisation of the air intake ducting and air filter housing leads to a substantial reduction of losses which together with an uprated fuel supply system results in the hike in output of 41 kW (60 hp) from previously 540 hp.
Inside the cylinders specific MAHLE pistons are designed to deal with temperatures and pressures associated with up to 1.4 bar charging and the engine’s 10.0:1 nominal compression ratio.
Despite its impressive performance characteristics and high specific power output long cruising ranges are achieveable thanks to a combined fuel consumption measured according to ECE norm of 9.4 to 10.4 l/100 km and CO2 emissions of 219 to 242 g/km, depending on the model.
The all-wheel drive system uses the technical possibilities of the BMW xDrive system, whose intelligent and dynamic control system distributes output smoothly and fully variably between the front and rear axles in milliseconds, thereby ensuring maximum traction and superior performance in all driving situations. The torque distribution control system, which is interconnected with the engine management and chassis control systems, is performance-oriented. It significantly increases driving dynamics and agility, particularly during high lateral acceleration and guarantees sporty and neutral handling. Besides ensuring optimal traction during acceleration by preventing slip-related losses, the system also permanently monitors the driving conditions and actively distributes torque to always ensure a high degree of propulsion and safety at all times, e.g. on snow or road surfaces with abrupt changes in the friction coefficients.
The B6 Bi-Turbo Gran Coupé features a full stainless steel exhaust system with ALPINA trademark elliptical twin tailpipes. The character of the deep exhaust note is prominent but not intrusive. Active exhaust valves allow the balancing act between aural enjoyment and comfort on long journeys – the driver can influence the sound experience using the Driving Dynamics Control button. In Comfort Mode the exhaust valve is closed up to 2500 rpm, in Sport Mode the valve is permanently open.
An high-tech and high-strength titanium exhaust system is available as an option. Developed in cooperation with Akrapovic, this light-weight exhaust system achieves a 17 kg weight reduction compared to stainless steel.
Information on fuel consumption and CO2 emissions according to VO (EG) 715/2007:
|BMW ALPINA B6 BITURBO||Gran Coupé|
|Fuel consumption, combined:||10.4 l/100km|
|CO2 emissions combined:||242 g/km|
|CO2 efficiency category:||E|
Further information on specific fuel consumption and specific CO2 emissions of new passenger cars is given in „Leitfaden über den Kraftstoffverbrauch, die CO2-Emissionen und den Stromverbrauch neuer Personenkraftwagen” which can be obtained free of charge at all points of sale and from the Deutsche Automobil Treuhand GmbH (DAT), Helmut-Hirth-Str. 1, 73760 Ostfildern-Scharnhausen.
Determined on the basis of the measured CO2 emissions taking into account the mass of the vehicle.