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X6 SAV - E71/E72 (2008 - ...) - Powerful Straight-six: Petrol and Diesel

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X6 SAV - E71/E72 (2008 - ...)
Side, Rear and Interior View
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Powerful Straight-six: Petrol and Diesel
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BMW’s most powerful straight-six in the world’s first Sports Activity Coupé.
The second gasoline-powered version of the BMW X6 boasts the most powerful straight-six within BMW’s engine portfolio: Maximum output of the engine featured in the BMW X6 xDrive35i is 225 kW/306 hp from engine capacity of 3.0 litres.
This superior power is maintained consistently between 5,800 and 6,250 rpm, with maximum torque of 400 Newton-metres/295 lb-ft provided all the way from 1,300–5,000 rpm. This gives the six-cylinder superior power and performance from an unusually early point on a gasoline engine, subsequently maintaining this high power throughout a broad range of engine speed.
Like the new V8 power unit, the engine in the BMW X6 xDrive35i offers the exclusive combination of Twin Turbo technology and High Precision Injection available only from BMW for incomparable power and performance plus a standard of economy quite unique in comparison with the engine’s dynamic driving potential.
On the straight-six with Twin Turbo technology two exhaust turbochargers each supply compressed air to three cylinders. The small mass inertia of the relatively compact turbochargers optimises response to a significantly higher degree also on this engine, building up charge pressure without the slightest delay from low engine speeds. The result is a rapid increase in power and torque further promoted by infinitely variable double-VANOS camshaft control.
This particular character of BMW’s Twin Turbo gasoline engines unique the world over offers an exceptionally high standard of supremacy and elasticity on the road. In practice, this allows the driver to use the superior torque of the engine right from the start when accelerating, with engine power then remaining consistent over a wide speed range.
The exceptional dynamism of the engine is further enhanced by its high compression ratio, again an advantage made possible by High Precision Injection: With the fuel/air mixture being cooled as a result of direct injection, the compression ratio can be increased to a higher level than on a turbo-charged engine with intake manifold injection.
Engine efficiency is improved accordingly, offering more power on less fuel.
A further benefit on the straight-six with High Precision Injection is the central arrangement of the piezo-injectors between the valves and in the imme-diate vicinity of the spark plugs ensuring particularly precise dosage of the fuel injected.
The level of power offered by the straight-six with Twin Turbo Technology and High Precision Injection is absolutely equal to the power only a much larger eight-cylinder was able to provide in the past. But at the same time BMW’s most powerful six-cylinder offers a much higher standard of fuel economy and, also thanks to its all-aluminium crankcase, is much lighter, in the interest of superior agility on the road.


Maximum diesel power: straight-six with Variable Twin Turbo.
Two turbochargers, direct fuel injection, optimum performance – the most powerful diesel engine available in the BMW X6 shows a number of interesting features quite comparable to the two gasoline engines. Indeed, the 3.0-litre straight-six diesel with Variable Twin Turbo (VTT) technology is a truly outstan-ding engine in every respect, developing 210 kW/286 hp at 4,400 rpm as the most sporting power unit of its kind the world over. At the same time the BMW X6 xDrive35d boasts its own, unique characteristics and a wide range of equally unique technical features.
This outstanding power unit impressively underlines BMW’s great compe-tence also in the development of the diesel engine. With its all-aluminium crankcase, VTT turbocharging and third-generation common-rail fuel injection featuring piezo-injectors, the engine offers ideal qualities for impressive power and performance combined with outstanding efficiency.
Weighing just 194 kg or 428 lb, this high-performance diesel is some 50 kilos or 110 kb lighter than an eight-cylinder with roughly the same output – an advantage again benefiting the dynamic driving character of the BMW X6 xDrive35d.
Thanks to this superior power, acceleration to 100 km/h comes in 6.9 seconds and the top speed of the BMW X6 xDrive35d is 236 km/h or 146 mph. Com-pared with this kind of performance, average fuel consumption in the EU test cycle of just 8.3 litres/100 kilometres (34.0 mpg imp) is even more impressive.
This outstanding efficiency is attributable in particular to the Variable Twin Turbo system, with VTT turbocharging serving initially to activate the small turbocharger at low engine speeds. Thanks to its lower level of inertia, this small turbocharger unit helps to boost power immediately in response to even the smallest movement of the gas pedal, without the slightest delay. Then, with engine speed increasing, the second, larger turbocharger also cuts in, developing maximum torque of 580 Newton-metres/427 lb-ft at just 1,750 rpm. Interaction of the two turbochargers, finally, is masterminded by particularly efficient engine electronics.


Full of torque and highly economical: straight-six diesel with variable turbine geometry.
The second and particularly economical diesel model is the BMW X6 xDrive30d also powered by a 3.0-litre straight-six with an all-aluminium crankcase and third-generation common-rail direct fuel injection.
The turbocharger on this power unit comes with variable intake geometry ensuring muscular and, at the same time, smooth and harmonious develop-ment of power tailored to all driving conditions. Operating with maximum efficiency, the turbocharger increases both engine output and torque, with maximum power of 173 kW/235 hp at 4,000 rpm and peak torque of 520 Newton-metres/383 lb-ft at just 2,000 rpm.
Common-rail fuel injection featuring piezo-injectors also serves on this version of the 3.0-litre diesel to generate superior power in conjunction with a high level of efficiency, optimised emissions and supreme motoring culture.
The BMW X6 xDrive30d accelerates to 100 km/h in 8.0 seconds and reaches a top speed of 210 km/h or 130 mph (220 km/h or 136 mph with the optional high-speed set-up). With average fuel consumption of 8.2 litres/100 kilo-metres (34.4 mpg imp) in the EU test cycle and a maximum cruising range of 1,035 kilometres (642 miles), the BMW X6 xDrive30d sets the standard against the competition seeking to match the BMW X Models.
To optimise emission behaviour both diesel engines come with a state-of-the-art particulates filter and an oxidation catalyst housed in the same unit. Being placed directly on the engine, this exhaust gas cleaning system reaches its operating temperature almost immediately after the engine has been started, thus offering its full effect at a particularly early point.
The particulates filter operates free of maintenance and regenerates itself by burning the diesel particles, thus ensuring an efficient filter function at all speeds and under all loads, without the slightest influence on engine output and fuel consumption. The CO2 rating of the BMW X6 xDrive35d is 220 grams/kilometre, with the BMW X6 xDrive30d offering an even better 217 grams/kilometre.
Both the BMW X6 xDrive35d and the BMW X6 xDrive30d come with a diesel filling guard preventing the user from inadvertently filling up the tank with gasoline. This is done by using a lock ratchet on the intake manifolds of both models, which only a diesel pump filler larger in diameter is able to open.
This virtually rules out the risk of filling in the wrong fuel, as may be the case when the driver is not acquainted with the car, for example in the case of a rental vehicle. So at all filling stations using appropriately standardised pumps, the driver cannot go wrong by choosing the smaller gasoline pump filler smaller in diameter.

Last Updated on Monday, 12 April 2010 14:17  

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