Posted in category: BMW at: May 29, 2012 by carsmania
2013 BMW 7-Series, Alongside the flagship BMW 760i with 12-cylinder powerplant and the entry-level engine in the BMW 730i (not available in all markets), customers can choose from the new six-cylinder in-line unit powering the BMW 740i and the revised V8 petrol engine in the BMW 750i. The six-cylinder diesel engines in the BMW 730d and BMW 740d also offer drivers the combination of increased output and lower fuel consumption. Making its debut, meanwhile, is the new BMW 750d xDrive. Under its bonnet lies the new TwinPower Turbo six-cylinder diesel engine – the world’s most powerful diesel engine of its kind. Rounding off the range is the second-generation BMW ActiveHybrid 7 with new six-cylinder in-line engine and significantly reduced emissions.
The V12 engine with BMW TwinPower Turbo technology, direct petrol injection and continuously variable camshaft control represents the pinnacle of the BMW 7-Series engine range – no change there. The all-aluminium powerplant generates output of 400 kW/544 hp from its 5,972 cc displacement and makes peak torque of 750 Newton metres (553 lb-ft) available as low down as 1,500 rpm. That’s enough to propel the BMW 760i effortlessly from 0 to 100 km/h (62 mph) in just 4.6 seconds and on to an electronically limited top speed of 250 km/h (155 mph). With average fuel economy of 12.8 litres per 100 kilometres (22.1 mpg) and CO2 emissions of 299 g/km, this most cultured of power merchants achieves unprecedented efficiency for its output class.
The revised V8 petrol engine under the bonnet of the BMW 750i is making its debut. The 4,395 cc eight-cylinder powerplant retains the impressively smooth assurance and spirited power delivery of its pre-update days. However, optimised high-pressure direct injection and reduced charge cycle losses – thanks in the main to the seamlessly variable control of intake valve lift – have pushed its performance potential to a higher level than its predecessor and substantially reduced its fuel economy and emissions. In its latest development stage, the engine generates peak output of 330 kW/450 hp (+ 10 %) and unleashes peak torque of 650 Newton metres / 479 lb-ft (+ 8.5 %) between 2,000 and 4,500 rpm. The engine teams up with the eight-speed automatic transmission, allowing the BMW 750i to sprint from 0 to 100 km/h (62 mph) in just 4.8 seconds and progress on to an electronically governed top speed of 250 km/h (155 mph). The eight-cylinder engine belies its improved performance with better efficiency than ever; with overall fuel consumption of 8.6 litres per 100 kilometres (32.9 mpg) and CO2 emissions recorded at 199 g/km, the BMW 750i trumps its less powerful predecessor by a clear 25 per cent. In the Chinese market, the BMW 750i is powered by a 4-litre variant of the engine offering 300 kW/408 hp and 600 Newton metres (443 lb-ft) of torque.
The 3-litre six-cylinder in-line engine stands out with its majestic power and unparalleled high-revving character. The state-of-the-art powerplant is one of the first wave of highly efficient petrol engines to bring together BMW TwinPower Turbo technology with High Precision Direct Petrol Injection, twin-scroll turbocharging, Double-Vanos variable camshaft timing and Valvetronic variable valve timing. Peak output of 235 kW/320 hp and a maximum 450 Newton metres (332 lb-ft) of torque on tap as low down as 1,300 rpm make this ultra-refined engine the performance equal of the outgoing BMW 740i. However, fuel economy in the EU test cycle is an impressive 7.9 litres per 100 kilometres (35.8 mpg) while CO2 emissions of 184 grams per kilometre represent a 21 per cent reduction in its predecessor’s output.
This proven 3-litre straight-six petrol engine develops, as before, 190 kW/258 hp and maximum torque of 310 Newton metres (229 lb-ft) at 2,600 rpm. Linking up with the new eight-speed automatic transmission allows the BMW 730i to exploit additional fuel-saving potential; average fuel economy stands at 8.6 litres per 100 km (32.9 mpg), while CO2 emissions of 199 grams per kilometres are 13 per cent below the level recorded by its predecessor working with a six-speed transmission.
The brand-new top-of-the-line diesel powerplant under the bonnet of the BMW 750d xDrive provides fresh evidence of BMW’s pre-eminence in the area of engine technology. The world’s most powerful six-cylinder in-line diesel engine grabs the headlines with its innovative and unique technology, and imbues the luxury sedan with impressive dynamics and outstanding efficiency.
The remarkable TwinPower Turbo technology at the heart of the six-cylinder unit works with three turbochargers and a further developed common rail injection system for the first time in order to optimise the engine’s output, torque and responsiveness. The precisely coordinated management of the turbochargers ensures that the 3-litre high-performance diesel engine develops imposing pulling power across the full rev range – and all with an exceptionally high level of efficiency. The first charger starts work at just over idle so the combustion chambers can be supplied at an early stage. At 1,500 rpm a larger high-pressure turbo kicks in to help the engine reach its maximum torque. Finally, the third turbocharger joins the fray at 2,700 rpm and ensures particularly impressive power delivery until maximum revs are reached. Piezo injectors spray the fuel into the combustion chambers at up to 2,200 bar, with three pre-injections, one main injection and four post-injections of fuel during each power stroke ensuring efficient and clean combustion.
This enviable engine technology enables the six-cylinder in-line powerplant to produce maximum output of 280 kW/381 hp and impressive peak torque of 740 Newton metres (546 lb-ft) from as low down as 2,000 rpm, endowing the BMW 750d xDrive with extraordinary thrust. Indeed, the Sedan races from 0 to 100 km/h (62 mph) in only 4.9 seconds. The engine’s vast reserves of power also give it a compelling elasticity. Equally impressive as its performance capability, however, are the efficiency benefits of the BMW diesel technology on board; the Sedan posts fuel economy of 6.4 litres per 100 kilometres (44.1 mpg) in the EU test cycle, which means CO2 emissions are also suitably low at 169 g/km. Plus, BMW BluePerformance technology enables the new flagship diesel to meet the EU6 exhaust gas standard comfortably ahead of time.
The rigorous further development of BMW TwinPower Turbo technology has also given the dynamics and efficiency of the familiar six-cylinder in-line diesel engine a boost. At 230 kW/313 hp, the maximum output of the 3-litre six-cylinder diesel is five kilowatts higher than its predecessor’s, while peak torque of 630 Newton metres / 465 lb-ft (+ 30 Nm / 22 lb-ft) comes on stream at 1,500 rpm. Added to which, thermodynamic optimisations sharpen the diesel model’s responses and enhance its agility. Linking up with the new eight-speed automatic transmission, the more powerful BMW 740d manages to record even lower fuel consumption of 5.7 litres per 100 kilometres (49.6 mpg) to go with CO2 emissions of 149 g/km. That’s a 17 per cent improvement on its predecessor.
Another round of fuel consumption and emissions reductions sees the BMW 730d building on its position as the world’s most economical luxury sedan with the lowest emissions. Peak output of the 3-litre six-cylinder diesel engine, whose construction mirrors that of the engine in the BMW 740d, has increased by 10 kilowatts to 190 kW/258 hp. And its maximum torque has also risen to 560 Newton metres / 413 lb-ft (+ 20 Nm / 15 lb-ft). However, average fuel economy of 5.6 litres per 100 kilometres (50.4 mpg) in the EU test cycle and CO2 emissions of just 148 g/km allow it to outperform its predecessor – married to a six-speed automatic transmission – by 17 per cent. Specifying the engine with the optionally available BluePerformance technology equips it to meet the EU6 standard.
BMW xDrive intelligent all-wheel drive makes the BMW 7-Series Sedan an even more attractive proposition. In addition to the typical benefits of all-wheel drive, the electronically controlled xDrive system – which can vary the power distribution between the front and rear wheels with split-second speed – ensures top-class traction, safety and handling, and optimal power management whatever the weather and road conditions. The system has been set up to deliver greater agility and precision through corners as well, offers an ideal combination of dynamism and comfort, and provides the perfect basis for a refined driving experience.
As BMW continues to push ahead with the development of intelligent hybrid drive systems, the second generation of the BMW ActiveHybrid 7 is set to celebrate its premiere in 2012. The updated model sets itself apart with lower fuel consumption and emissions, as well as innovative auxiliary functions. This latest evolution stage uses a six-cylinder in-line engine displaying impressive high-revving characteristics, torque and efficiency. The cutting-edge petrol engine with BMW TwinPower Turbo technology is the 235 kW/320 hp variant of the unit fitted in the new BMW 740i and replaces the eight-cylinder engine used up to now. Other hybrid components include the 40 kW/55 hp synchronous electric motor, the hybrid-spec eight-speed automatic transmission, a lithium-ion high-performance battery and power electronics underpinning intelligent energy management. The various components come together into a powerful and harmonious whole, giving the new BMW ActiveHybrid 7 exceptional dynamics and an outstanding balance between performance and fuel economy – and not only in relation to its predecessor.
With system output of 260 kW/354 hp and peak torque of 500 Newton metres (369 lb-ft), the new BMW ActiveHybrid 7 accelerates from 0 to 100 km/h (62 mph) in just 5.7 seconds. At the same time, the Sedan posts average fuel economy of 6.8 litres per 100 kilometres (41.5 mpg) and CO2 emissions of 158 g/km. That means the more powerful hybrid technology uses some 14 per cent less fuel than a BMW 740i with a conventional drive system.