New BMW 5-series GT gets more efficient 6-cylinder turbo engine
Following last week's announcement of the production version of the new BMW 5-series Gran Turismo comes a new more fuel efficient engine variant. For the last two years, BMW has offered a twin turbocharged 3.0-liter inline 6-cylinder engine in the 335i, 535i and X5. When the new 535i Gran Turismo launches this fall it will be powered by a new single turbo edition of the same engine. Like the twin turbo, the new unit is also direct fuel injection with piezo injectors.
Loosing a turbo costs the engine 20 hp, bringing it from 326 hp to 306 hp, but peak torque stays the same at 295 lb-ft. The new engine does gain BMW's Valvetronic system with variable lift and cam phasing. The Valvetronic system reduces the amount of engine vacuum at light load reducing pumping losses. The combination of technologies allows the engine to achieve its peak torque at just 1,200 rpm so that drivers can get good low speed acceleration without having to excessively rev the engine. The 535i GT is rated at 26.4 mpg (U.S.) on the combined EU test cycle. Further aiding efficiency is a an electronically controlled oil pump to reduce parasitic losses.
Finally, the engine is mated up with a new eight speed automatic transmission that will be standard on 5-series Gran Turismos regardless of what engine is installed.
Dynamism, Comfort and Efﬁciency of the Highest Standard.
• New generation of engines entering the market: straight-six with TwinPower Turbo, High Precision Injection and VALVETRONIC.
• Top-of-the-range V8 developing 300 kW/407 hp, extremely economical six-cylinder diesel delivering 180 kW/245 hp.
• New generation of engines entering the market: straight-six with
• TwinPower Turbo, High Precision Injection and VALVETRONIC.
Top-of-the-range V8 developing 300 kW/407 hp, extremely economical six-cylinder diesel delivering 180 kW/245 hp. Innovative eight-speed automatic transmission featured as standard. • Introducing the BMW 5 Series Gran Turismo, the world's most successful manufacturer of premium cars is setting the foundation for an entirely new segment in the market, at the same time proving unique competence in drivetrain development. The new model is entering the market with a choice of two gasoline engines and one diesel power unit. In the process BMW's newly developed straight-six gasoline engine for the ﬁ rst time featuring turbocharger technology, High Precision Injection and variable VALVETRONIC valve management all together is making its world debut. Indeed, the intelligent combination of these three technologies gives this power unit the best and most direct response ever offered by a straight-six turbocharged engine from BMW. The new BMW TwinPower Turbo develops 225 kW/306 hp at a speed of 5,800 rpm, maintaining its maximum torque of 400 Newton-metres/295 lb-ft over a wide speed range from 1,200–5,000 rpm and, in comparison with the BMW turbo engine already well-known in other model series, offering even greater fuel economy combined with optimised CO2 management. The top engine in the BMW 5 Series Gran Turismo is the 300 kW/407 hp V8 with TwinPower Turbo and High Precision Injection – again the most efﬁcient engine in its class. The diesel engine, ﬁ nally, is a 3.0-litre straight-six of the latest generation featuring an all-aluminium crankcase as well as common-rail direct fuel injection with piezo-injectors and delivering maximum output of 180 kW/245 hp.
This outstanding power unit again clearly conﬁrms the effects and beneﬁ ts of BMW Efﬁ cientDynamics, giving the BMW 530d Gran Turismo average fuel consumption in the EU test cycle of just 6.5 litres/100 kilometres, equal to
43.5 mpg imp, and a CO2 rating of 173 grams per kilometre. All engines available in the BMW 5 Series Gran Turismo naturally comply with the EU5 emission standard. In addition, all the power units in the BMW 5 Series Gran Turismo come with the new eight-speed automatic transmission presented for the ﬁrst time in the new BMW 760i with its twelve-cylinder engine.
Through its high efﬁciency and the innovative layout of gearsets, the eight- speed automatic transmission makes a fundamental contribution to the further enhancement of efﬁciency on all three engine variants. World debut: TwinPower Turbo, High Precision Injection and
VALVETRONIC in a new straight-six gasoline engine.
The history of BMW's modern turbo engines going back to the year 2006 is characterised by spectacular power and exemplary efﬁciency. And now BMW is opening up a new chapter in this history, the straight-six gasoline engine powering the BMW 535i Gran Turismo consistently continuing the process of optimising engine power while at the same time reducing both fuel consumption and CO2 emissions on an engine of this calibre.
The 3.0-litre power unit, for example, is yet a further result of the BMW Efﬁ cientDynamics development strategy, offering a range of highlights in technology never seen before on any other engine – highlights created in the context of BMW EfﬁcientDynamics and now ideally matched for optimum driving dynamics and economy all in one.
The new straight-six is the world's ﬁrst engine to combine turbocharging, direct gasoline injection and fully variable VALVETRONIC valve management developed by BMW. The turbocharging process follows the twin-scroll principle already applied successfully by the BMW Group and now further enhanced consistently for use in a particularly powerful and sporting straight-six.
The combination of this turbocharger technology with High Precision Injection and VALVETRONIC exclusive to BMW exceeds even the response and efﬁciency of the BMW Twin Turbo power unit launched back in 2006.
Response even better than before, fuel consumption even lower. VALVETRONIC has already proven its qualities in numerous BMW engines the world over as a particularly effective technology providing even greater efﬁciency. The big advantage of VALVETRONIC is the inﬁnite control and adjustment of valve stroke on the intake valves, making the throttle butterﬂy used in former times superﬂuous. VALVETRONIC reduces throttle losses in the charge cycle process to an absolute minimum and optimises engine response since the air mass required to control the combustion process is masterminded in the engine itself and not outside the power unit with the usual "dead" volume. This ensures particularly efﬁcient use of the energy contained in the fuel, developing a very muscular torque curve and giving the engine optimum response.
In particular, the better response of a VALVETRONIC engine results from the fact that underpressure under part load is only approximately 50 millibar, while on a conventional engine up to 800 millibar of underpressure has to be set off. On the BMW 535i Gran Turismo the VALVETRONIC functions have been optimised again by a new adjuster complete with a fully integrated sensor serving above all to make the adjustment process even faster than before. Indeed, the inertia factor on the new adjuster is only one-tenth the ﬁ gure on the former model, serving to further improve engine response.
Responding smoothly, directly and immediately to the gas pedal, the new straight-six is clearly the leader in its class also in this discipline. Maximum torque of 400 Newton-metres/295 lb-ft, for example, comes at just 1,200 rpm. Apart from the optimised VALVETRONIC control unit, the newly developed turbocharger also contributes to this superiority, ensuring a particularly spontaneous build-up of power since the ducts of three cylinders at a time are separated from one another both in the exhaust manifold and the turbocharger. In practice, this means particularly low exhaust gas counter-pressure at low engine speeds, the double ducts then enabling the ﬂ ow of gas to build up greater dynamism in the exhaust manifold and powerfully drive the turbocharger blades even at low engine speeds. Twin-scroll technology thus combines the beneﬁ ts of two turbochargers within one system. And now this principle adapted to the BMW straight-six with its high standard of technology marks the ongoing, consistent development of BMW's turbocharged engines.
High Precision Injection with new injector nozzles.
The VALVETRONIC system is fully integrated in the cylinder head. This intelligent and extremely compact arrangement allows a direct combination with High Precision Injection with its injection nozzles placed in the middle between the valves and, therefore, in the immediate vicinity of the spark plug in the cylinder head.
High Precision Injection in the new six-cylinder delivers fuel through innovative multi-hole valves at an injection pressure increased once again in large areas all the way to 200 bar. This ensures extremely precise dosage of the fuel injected as well as a particularly clean combustion process. And last but not least in this context, the direct injection of fuel serves to cool the fuel/air mixture and increase the compression ratio to a higher level than in a turbocharged engine with manifold injection – an advantage contributing once again to the greater power of the straight-six.
Displacing 2,979 cc, the new power unit delivers maximum output of 225 kW/306 hp. It therefore offers all the torque and muscle of a signiﬁ cantly larger eight-cylinder, but comes with much lower weight and signiﬁ cantly lower fuel consumption and emissions. It is indeed far lighter than a comparably powerful eight-cylinder and remains even 4 kilos lighter than the straight-six turbocharged engine already well-established in the market.
The BMW 535i Gran Turismo accelerates from a standstill to 100 km/h in
6.3 seconds and reaches an electronically limited top speed of 250 km/h or 155 mph. The unusually good balance of performance and fuel consumption is clearly expressed by average fuel consumption in the combined EU cycle of just 8.9 litres/100 kilometres, equal to 31.7 mpg imp. And the CO2 rating of the BMW 535i Gran Turismo is just 209 grams per kilometre.
The BMW 535i Gran Turismo, like the other two model variants, comes as standard with a wide range of BMW Efﬁ cientDynamics technology.
Supplementing the excellent efﬁ ciency of the respective engine and the eight-speed automatic transmission, features such as Brake Energy Regenera- tion, on-demand management and operation of ancillary units including the electrical coolant pump, the electrical power assistance pump and the detach- able a/c compressor, as well as consistent lightweight engineering, optimised aerodynamics including active management of air ﬂ aps, and tyres with reduced roll resistance, ensure optimum fuel economy and emission management at all times.
The power unit of the BMW 535i Gran Turismo is the ﬁ rst turbocharged engine to feature a map-controlled oil pump which, taking up less energy, makes a further contribution to motoring efﬁ ciency. Yet a further point is that the new straight-six power unit with turbocharger, High Precision Injection and
VALVETRONIC, does not require sulphur-free fuel and may therefore be used without problems the world over. The ﬁ nal point is that the engine naturally fulﬁ ls both the EU5 emission standard in Europe and the ULEV II standard in the USA. Unique: eight-cylinder gasoline engine with TwinPower Turbo and
High Precision Injection.
The top engine in the BMW 5 Series Gran Turismo is the truly unique V8 with turbocharging and High Precision Injection. Displacing 4.4 litres, this eight- cylinder already to be admired in the BMW X6 xDrive50i and the BMW 750i now also offers its maximum output of 300 kW/407 hp in a speed range between 5,500 and 6,400 rpm in the BMW 5 Series Gran Turismo. Proudly bearing the name BMW TwinPower Turbo, the engine develops maximum torque of 600 Newton-metres/442 lb-ft all the way from 1,750 to 4,500 rpm.
As the world's only gasoline engine of its kind, this V8 comes with two turbochargers and catalytic converters in the V-section between the two rows of cylinders. The big advantage of this arrangement is compact dimensions with optimised cross-sections on the components involved in the charge cycle process, minimising pressure losses on both the intake and exhaust side. The driver will experience this superiority through the spontaneous and direct response to every movement of the gas pedal ensured thanks to this conﬁ guration by the extremely short and ﬂ ow-efﬁ cient ducts leading to the turbochargers.
The all-aluminium power unit of the BMW 550i Gran Turismo offers a truly incomparable, dynamic and, at the same time, comfortable rendition of the qualities typical of an eight-cylinder. It combines superior torque and muscle from low engine speeds with an impressive surge of continuous power all the way to top speed. Acceleration from a standstill to 100 km/h comes in just
5.5 seconds and ample power reserves are readily available at all times also at higher speeds. Top speed, ﬁ nally, is limited electronically to 250 km/h or 155 mph.
BMW TwinPower Turbo for a long and continuous ﬂ ow of power. The power and performance of this unique V8 results primarily from the particular turbocharger concept exclusive to BMW. This unique construction principle with two turbochargers not positioned at the outside, but rather directly in the V-section between the two rows of cylinders, each supplying four cylinders with compressed air, guarantees unparalleled spontaneity in taking up the driver's commands on the gas pedal. The "turbo gap" so typical of conven- tional turbocharged engines – the time elapsing until the turbocharger starts to develop its power boost – is simply not there any more.
A further signiﬁ cant point is that the engine revs up full of power and muscle, maintaining its very high torque consistently throughout an unusually broad range of engine speed. In its performance characteristics it therefore resembles a signiﬁ cantly larger normal-aspiration engine while at the same time it is much lighter, also thanks to its all-aluminium crankcase.
Not just the weight, but also the fuel consumption of this new V8 remains at a level unusually low for an engine of this class. A signiﬁ cant factor contributing to superior fuel economy is inﬁ nite double-VANOS camshaft adjustment so typical of a BMW engine, also enabling the V8 to deliver an exceptionally high level of torque right from the start at low engine speeds.
A further key function in providing maximum fuel efﬁ ciency is High Precision Injection. This second generation of direct gasoline injection incorporates piezo-injectors positioned in the cylinder head directly next to the spark plug and delivering fuel into the combustion chambers at a pressure of up to 200 bar.
Like on the new six-cylinder, this technical principle ensures precise dosage in the supply of fuel, helping to give the BMW 550i Gran Turismo average fuel consumption in the EU test cycle of 11.2 litres/100 kilometres (equal to
25.2 mpg imp) and limit CO2 emissions to 263 grams per kilometre. Again, this fulﬁ ls both the US ULEV II emission standard and the EU5 classiﬁ cation in Europe.
Ultra-modern diesel power: straight-six with aluminium crankcase and high-pressure fuel injection through piezo-injectors. The straight-six diesel featured in the BMW 530d Gran Turismo again represents the state of the art in BMW engine development. Indeed, this 3.0-litre diesel gives BMW even greater worldwide leadership in the development of diesel engine technology, coming complete with an all-aluminium crankcase. The signiﬁ cantly upgraded turbocharger system with variable intake geometry ensures a dynamic and, at the same time, harmonious ﬂ ow of power under all conditions. The supply of fuel, ﬁnally, is provided by the latest generation of common-rail direct injection.
This power unit presented with these features for the ﬁ rst time in the new BMW 730d stands out from its predecessor by even greater power and performance on lower fuel consumption and emissions. Displacing 3.0 litres, the engine develops maximum output of 180 kW/245 hp at a speed of 4,000 rpm. Peak torque of 540 Newton-metres/398 lb-ft, in turn, comes at just 1,750 rpm. Yet a further most substantial beneﬁt offered by this unique diesel is its unparalleled all-round economy, with average fuel consumption and CO2 emissions of the BMW 530d Gran Turismo remaining far below the usual ﬁgures on a vehicle of this size and with this kind of power.
Optimised combustion reducing raw emissions.
The newly developed crankcase of BMW's six-cylinder diesel is made of an ultra-strong aluminium-silicon alloy. The crankshaft made of high-strength steel is now even stiffer than before in its new layout and conﬁguration. The fuel injectors positioned in the middle, together with the vertically arranged valves, ensure a smooth and consistent combustion process and again serve to reduce raw emissions.
Fuel is supplied by proven third-generation common-rail direct injection using enhanced piezo-injectors and now operating at a maximum pressure at 1,800 bar.
A ﬁ nal point is that the high-pressure pump, the supply and injection lines, the rail pressure sensor and the pressure control valve on the new engine have all been upgraded and improved accordingly over the former generation. Used for the ﬁrst time on a six-cylinder diesel engine, the ceramic spark plugs optimise the engine's starting qualities in several respects. They also serve to reduce both fuel consumption and emissions and enhance motoring comfort while warming up by signiﬁcantly improving the engine's acoustics and vibration behaviour.
Turbocharger with adjustable turbine geometry and optimised control.
The exhaust gas turbocharger upgraded to a new standard over the previous unit likewise helps to optimise the qualities and efﬁciency of the new six-cylinder diesel. Activated as a function of load conditions and power requirements, the adjustment of turbine geometry is now controlled with even greater precision. Modiﬁed compressor and turbine rotors give the turbocharger even better thermodynamic qualities, while an electrical adjuster motor adjusts the turbine blades with maximum precision and minimum delay in response to current requirements. The result is spontaneous and direct engine response at low revs as well as supreme power and performance under full load.
The newly conceived exhaust gas recirculation system ensures an even better and more consistent distribution of exhaust gas and fresh air in the cylinders. The stainless-steel exhaust gas cooler optimised for maximum power and performance comes complete with a bypass ﬂ ap reducing harmful emissions while the engine is warming up.
The amount of exhaust gas fed in during the process as well as the temperature of the exhaust gas may be determined with maximum precision, depending on the operating point and the temperature of the engine. This ensures minimisation of hydrocarbon, carbon monoxide and nitric oxide emissions right from the start within the engine and guarantees superior running smoothness and reﬁnement at all times.
Weight down, agility up, emissions reduced.
Overall weight of the new six-cylinder diesel is just 185 kg or 408 lb. This reduction of weight enhances not only the efﬁciency of the BMW 530d Gran Turismo, but also the car's agility, with acceleration from a standstill to 100 km/h in just
6.9 seconds. Top speed, in turn, is 240 km/h or 149 mph.
This sporting performance comes with average fuel consumption in the EU cycle of just 6.5 litres/100 kilometres, equal to 43.5 mpg imp, and CO2 emissions are a mere 173 grams per kilometre.
With its compact dimensions, low weight, reduced height and the chain drive moved to the back of the engine, the new diesel also helps to meet future requirements in pedestrian safety. As a further point the risk of injury may be reduced by the intake silencer deformable also in its height and therefore giving way exactly when required beneath the likewise new cylinder head cover made of a special synthetic material.
Diesel particulates ﬁlter and catalytic converter in one unit. The alternator, steering assistance pump and a/c compressor are all arranged on the left-hand side of the engine, leaving the right-hand side open for the diesel particulates ﬁlter, the oxidation catalyst and the turbocharger system. These exhaust gas cleaning units are all housed in one joint unit positioned directly behind the engine.
Thanks to the technical innovations boasted on the new six-cylinder power unit, the engine signiﬁcantly outperforms even the EU5 emission standard, with emission management reducing not only diesel particulates, but also hydro- carbons and carbon monoxide most effectively.
The diesel particulates ﬁlter operates maintenance-free and does not require any additives. The regeneration phases required at regular intervals are initiated by a subsequent injection process activated by engine management. Innovation with eight gears: the new automatic transmission.
The innovative character of the BMW 5 Series Gran Turismo is borne out clearly not only by the range of engines, but also by the power transmission. All model variants come as standard with the eight-speed automatic transmission so far featured exclusively in the twelve-cylinder BMW 760i luxury performance saloon, offering an unprecedented level of gearshift comfort, sportiness, and efﬁciency.
The transmission makes a signiﬁcantly greater contribution once again to the reduction of fuel consumption and emissions compared with the six-speed automatic transmission used by BMW so far. The new eight-speed automatic transmission is therefore ideally suited to further enhance and highlight the dynamic driving qualities, the superior grand touring comfort and the progressive overall concept of the BMW 5 Series Gran Turismo.
The new eight-speed automatic transmission excels through the innovative layout of its gearsets, allowing the use of additional gears and a larger increment of gear ratios over the former six-speed automatic without any negative effects on the size, weight and internal efﬁciency of the transmission.
The eight forward gears and the reverse gear are provided by four simple gearsets and ﬁve shift units. The innovative arrangement of these components to be seen for the ﬁrst time worldwide in an eight-cylinder automatic transmission offers the big advantage that only two of the total of ﬁve clutches are required to run along open in each gear, thus reducing frictional losses under all driving conditions to an absolute minimum.
Apart from the broader range of gears and the high standard of efﬁciency, this factor likewise contributes to the supreme, highly efﬁcient qualities of the new transmission. The intelligent concept of this new eight-speed automatic therefore provides an ideal match for the BMW EfﬁcientDynamics development strategy.
Triple progress with two additional gears: gearshift dynamics up, comfort up, efﬁciency up.
With the transmission offering an even wider range of increments, the driver is able to use above all the highest gear at far lower engine speeds. And thanks to the use of eight gears, the gaps between the individual gears are smaller than before despite the broader range of increments.
Obviously, this enhances the sporting character of the transmission and, therefore, the dynamic philosophy of the vehicle again so typical of BMW. While accelerating, for example, the harmonious ﬂ ow of gears into one another ensures a particularly consistent and smooth build-up of speed on the road. The smaller differences between the transmission ratios likewise serve to enhance gearshift comfort, changing gears involving only a small change in engine speed.
With reaction and gearshift times even shorter than on the former six-speed automatic, the driver and passengers enjoy even greater motoring comfort and driving dynamics all in one. When shifting up or down one or two gears only one clutch has to be opened, direct determination of the right gear ensuring extremely short response and gearshift times also when shifting more than two gears.
Even when shifting down from eighth to second gear for spontaneous and powerful acceleration, the entire process is conducted as a direct gearshift requiring only one clutch to be opened. This conﬁguration is indeed particularly beneﬁcial to a supreme style of motoring in the BMW 5 Series Gran Turismo, allowing the driver to use the higher gears most suited for greater efﬁciency and smoothness more often than before, while beneﬁtting from the car's maximum power and performance spontaneously and without the slightest delay.
The only slight increase in the number of components compared with the former six-speed automatic gives the new eight-speed automatic transmission an unusually high standard of internal efﬁciency. Gear mesh efﬁciency, as it is called, exceeds the level of 98 per cent in each gear.
Sixth gear serves as a direct gear and therefore avoids frictional losses altogether.
The low weight of the new transmission almost exactly the same as on the former six-speed automatic again helps to increase the overall efﬁciency of the car. In all, minimum converter slip, the high degree of internal efﬁciency, low frictional value losses with only two clutches open at a time, the longer transmission ratios on the higher gears and transmission management enabling the driver to drive at lower speeds more often, all contribute to a signiﬁcant improvement of fuel economy over the former six-speed automatic.
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