What’s fascinating about the A8 is its supremely powerful presence; its design is clearly derived from the brand’s genes and yet has undergone further refinement. The long wheelbase does not disturb its taut outlines, which remain as athletic as they are elegant.
The A8 L has a body built from aluminum using the Audi Space Frame (ASF) principle and therefore weighing about 40 percent less than a comparable steel body. The ASF body structure is built up from cast elements, extruded sections and sheet aluminum, with integral B-posts made from form-hardened ultra-high strength steel. This body’s tremendous rigidityRigiditySufficiently high static and dynamic body stiffness are prerequisites for many desirable vehicle characteristics.Rigidity is the key to the car’s precise handling, low interior noise levels and high passive safetyPassive SafetyPassive safety refers to all design measures that help protect the car's occupants against injury or help reduce the severity of injuries in the event of an accident. Passive safety measures include the safety belt system, the airbags*, the rigid occupant cell and the crumple zones at the front of the vehicle. Passive Safety for the occupants in the event of an accident.
Among the high-end technologies featured on the A8 model line are the optional LED headlight units (standard on the A8 L W12 quattro) with all lighting functions performed by LEDs. With this bright, high-efficiency light, Audi opens a new chapter in the history of automobile lighting technology.
Subtle visual details distinguish the A8 L W12 quattro from the other cars in this model line. The single-frame radiator grille with integral grid structure has a high-gloss black paint finish and special chromed horizontal bars. There are also chromed inserts of new design in the air inlets, and chromed applications on the exterior mirrors. W12 badges are displayed on the single-frame grille and at the rear of the car. The exhaust system has two trapezoidal-pattern tailpipe trims neatly integrated into the rear bumper.
Abundant space: Rear-seat area
The full extra length of this sedan benefits rear-seat passengers. The back doors are longer, for even more convenient entry, and the space available inside can only be described as opulent. Rear passenger comfort can be enhanced even more if two separate power-adjustable seats are ordered. These can be heated, ventilated and adjusted in a variety of ways: forward and back, seat cushion depth and seat back angle with top section adjustable separately. There is also a fully adjustable lumbar support. The front passenger’s seat can also be moved from the rear if extra space is needed.
Between the individual rear seats that are standard equipment in the Audi A8 L W12 quattro a full-length console can be ordered as an optional extra; it extends back from the center tunnel to the rear shelf, and can be specified with integral items such as a folding table or a refrigerator. Separate controls for the rear air conditioning are also standard. The luxury four-zone automatic air conditioning is controlled by no fewer than 25 adjusting motors.
Another high-end feature of the long-wheelbase Audi A8 is the reclining seat behind the front passenger’s seat. The angle of the seat cushion can also be adjusted. The occupant can be massaged by ten air-filled compartments; four programs can be selected at a remote control. The feet rest on a power-adjustable support at the base of the front passenger seat back. Heating, ventilation and the luxury head restraint are integral features of the reclining seat. A folding table, additional wood and leather trim, a refrigerator and a Rear Seat Entertainment system with two 10.2-inch screens are among the features that promote relaxed travel or alternatively concentrated work in this mobile lounge.
Fine materials: Interior design
The quality of workmanship in the A8 L is simply first-class – from the restrained ambient lighting through the accurately fitted switches with their precise click action. Fascinating aspects of the car’s interior are the slim, clear outlines and the stylish materials with their modern look.
Audi design selection brass beige carefully combines well-matched colors with individual materials and comfort-oriented equipment items. The roof-mounted grab handles and rear console have additional fine wood trim.
Valonea leather is tanned exclusively with plant extracts and is especially soft and able to “breathe” actively. Audi also supplies a loose cushion for rear-seat passengers’ use. Like the head restraintsHead RestraintsBoth in a rear-end impact and during the rebound phase of a frontal crash, the design and position of the head restraints has a substantial influence on occupant head and neck loads.Head Restraints and the selector lever for the eight-speed tiptronic automatic transmission, it is trimmed with buckskin that is exceptionally soft and supple but also hard-wearing.
Another optional extra, the panoramic glass roof, has two glass panels that allow plenty of light to reach the car’s interior. Both sections can be tilted up and the front one also opened extra-wide. Sun blinds are provided for both panels to keep out direct sunlight.
The Audi A8 L W12 quattro: Splendor and efficiency
Twelve cylinders are the ultimate engine configuration, a tradition that still applies in the large luxury car class. The first-generation A8 was available with an engine of this type from 2001 on, and a developed version could be obtained from 2004 on in the following model. Audi’s engineers have now thoroughly revised the W12. Its displacementDisplacementThe total volume of air displaced by all the pistons within an engine block.Displacement has been increased, and gasoline direct injection boosts its output and its efficiency.
The 6.3 FSI engine has an output of 368 kW (500 hp) and delivers its peak torqueTorqueTorque is what causes rotational speed to change. Just as greater net forces cause greater linear accelerations, greater torques cause greater rotational or angular accelerations.Torque of 625 Nm (460.98 lb-ft) at engine speeds at 3,250 rpm. It gives the long-wheelbase Audi A8 the kind of performance normally expected of a sports car: it sprints from 0 to 100 km/h (62.14 mph) in only 4.9 seconds and effortlessly reaches its governed top speed of 250 km/h (155.34 mph).
A fascinating flow of power is available in every situation, but the fuel consumption too sets new standards: the EU cycle test result is only 12.0 liters per 100 kilometers (19.6 US mpg), a figure well below that of competitors’ cars with V12 engines. The previous 6.0-liter engine, which had a power output of 331 kW (450 hp), recorded a fuel consumption of 13.6 l/100 km (17.3 US mpg) – the difference of 1.6 l/100 km is equivalent to a 12 percent improvement.
The engine is known as the W12 because of its unusual layout: it has four rows of three cylinders with a 15-degree included angle between the two offset rows of cylinders in each broad cylinder block. The V angle between the two blocks is
72 degrees. This layout makes the W12 engine exceptionally compact: only just over 50 centimeters (19.69 in) long and therefore distinctly shorter than a V8. Height and width are both in the region of 70 centimeters (27.56 in).
The W12, in its latest form with a displacement of 6,299 cc, is an undersquare design. Its boreBoreThe inside diameter of a hollow, cylindrical object.Bore and strokeStrokeThe distance a piston moves in its travel from top dead center to bottom dead center. Stroke are 86.0 and 90.4 millimeters (3.39 x 3.56 in) respectively. Compared with the previous version the engineers have enlarged the cylinder bore. The forged crankshaft has a 12-degree angle of crankpin offset, so that the mixture in the 12 cylinders is ignited at the ideal interval of 60 degrees. The engine therefore runs exceptionally smoothly, and the car’s occupants are unlikely to sense any of this supreme power at work unless it is at high engine speeds and severe loads.
The W12 engine weighs only 247 kilograms (545 lb), an impressive value to which the crankcase makes a major contribution. This is a lightweight, high-strength aluminum-silicon alloy casting with a gray cast iron lower cross-member into which the bearing pedestals are embedded. The pistons are forged from a high-strength light alloy and have angled crowns because of their V position in the cylinder blocks.
Each of the W12 engine’s aluminum cylinder heads contains two camshafts; these can be repositioned hydraulically by an amount equivalent to 52 degrees of crankshaft rotation. Altogether, the four camshafts operate 48 valves by way of low-friction roller cam followers, and are themselves driven by chains from an intermediate shaft.
For use in the long-wheelbase A8, Audi’s engineers have converted the W12 engine to FSI gasoline direct injection. This involved considerable modifications to the cylinder heads. Fuel is injected into the combustion chambers at a pressure of up to 130 bar. A high 11.8:1 compression ratioCompression RatioThe ratio of the cylinder and combustion chamber volume when the piston is all the way at the bottom (bottom dead center) to when the piston is all the way up in the cylinder (top dead center).Compression Ratio boosts power output and efficiency. The inlet ports are specially shaped to impart swirl to the incoming airflow and make combustion more efficient.
The W12 engine’s low fuel consumption compared with its competitors is to a large extent due to Audi’s modular efficiency platform. These are used in the entire A8 model line. The crankshaft and timing chains have been intensively optimized to reduce friction, and a recuperation system recovers energy that would otherwise be wasted when the car is braked. The innovative thermal management system shuts down the coolant circuit for a time after the cold engine has been started. This warms up the engine oil more rapidly and shortens the operating period in which friction is still high.
Engine: 2L I4
Fuel Type: Gas
Curb Weight: 3,527 lbs.
2011 Audi A4 Review
The 2011 Audi A4 has many different features that make it a desirable car. For example, it has managed to become a muscle car while still having an acceptable gas mileage. The city fuel economy for the 2011 Audi A4 is between 21 miles per gallon and 23 miles per gallon. The highway fuel economy for the 2011 Audi A4 is between 27 miles to the gallon and thirty miles to the gallon. You can own a 2011 Audi A4 for anywhere between $31,950 and $35,940.]
The Advantages and Disadvantages of the 2011 Audi A4
Disadvantages of the 2011 Audi A4 include the complicated controls and the fact that it is not as fast as other cars on the market. Other people also believe that the automatic transmission is not as responsive as it should be. In addition, the handling seems to be a little bit nose heavy.
Audi A4 Available Styles
You can choose between three different styles for the 2011 Audi A4. The four door Four Wheel Drive Front Trak Sedan 2.0T Premium will cost $31,950. The four door All Wheel Drive Quattro Sedan 2.0T Premium will cost $32,850. The four door All Wheel Drive Quattro Avant 2.0T Premium will cost $35,940.
Audi A4 Engine
Under the hood, all models of the 2011 Audi A4 have the turbocharged 2.0-liter four cylinder; this engine has a full 211 horsepower. In addition, the Quattro all wheel drive system has a torque split of 40/60. There is also an engine oil cooler. The fuel tank carries 17.2 gallons.
As far as handling controls, certain features include multi-link rear suspension, stability control, a front anti roll bar, a rear anti roll bar, rack and pinion steering, and even front vented disc brakes.
Available Transmissions for the 2011 Audi A4
You can choose between three different transmissions. The six speed manual transmission comes with overdrive. The eight-speed CVT transmission comes with overdrive and auto manual. The eight speed automatic transmission comes with overdrive and auto manual.
The 2011 Audi A4 looks like the larger Audi A6 in a way. It has a tiny spoiler that is a part of the trunk lid and two exhaust outlets. Other exterior features include standard seventeen-inch alloy wheels optional eighteen to nineteen inch wheels. You can also choose to have swiveling headlights, xenon headlights, or LED running headlights and taillights. The glass sunroof is standard.
Audi A4 Interior Features
The 2011 Audi A4 has chosen to incorporate a Multi Media Interface into its system. The Multi Media Interface controls the navigation system, the audio controls, and even the vehicle settings. Other notable interior features for the 2011 Audi A4 include HD radio for the navigation system, standard automatic air conditioning, optional keyless entry, and an optional upgraded audio system.
Specs for the new 2011 Audi A4
- Pricing: MSRP for the 2011 A4 will start at $31,950 for a base model and rise from there.
- Engine: Two engine choices are available: a 2.0-liter turbocharged V4 FSI engine which gets 207 horses thundering under the hood or a 3.1-liter V6 that has 255 horsepower.
- Fuel Economy: The turbocharged engine has an EPA rating of 23/30 miles per gallon city/highway.
- Acceleration: Acceleration for the 2011 A4 is brisk and satisfactory at 6.5 seconds for the zero to sixty sprint.
- Transmission:A six-speed manual is standard on the A4 but there is an option for a six-speed automatic that will include the manual shift control option.
- Car Safety Features: In 2010, the Audi A4 was perfection all around when it came to safety, scoring an amazing five out of five stars in every category for government crash tests. Standard safety features includes two stage airbags on the front, side and head airbags for the front seat occupants as well as side curtain airbags for the rear.
- Warranty: Audi offers its standard 5-year/60,000 mile warranty on the A4
The base 4.2 R8 has a 420 horsepower high-revving V8 engine and all-wheel-drive. It uses the mid-engine Lamborghini Gallardo platform and starts at $114,200, positioning it squarely against the BMW M6, Porsche 911, and Aston Martin Vantage.
The car features a choice of LED or Xenon headlamps surrounded by LED running lights and indicators. LEDs are also used in the engine bay to make the impressive V8 visible even at night.
Both a standard manual and an automated manual transmission are offered. Claimed zero to 62 mph time is 4.6 seconds, though this number is likely conservative.
The interior has a driver-oriented cockpit architecture, integrating the driver between the dashboard and the high center console. The instrument panel above the console is angled slightly towards the driver. The flat-bottomed steering wheel is a typical feature of the sportiest Audi models, and also enables comfortable sports car entry and exit.
The sports seats are trimmed as standard in a Leather/Alcantara combination, or optionally in full leather. Alternatively, the R8 can also be fitted with bucket seats, specially developed by quattro GmbH. There is plenty of room for the two occupants, with comfort levels well beyond the norm of high-performance sports cars. There is space behind the seats to stow large bags, or even two golf bags. The luggage compartment at the front has a capacity of 100 litres.
With numerous trim variants and applications in Piano finish or Carbon sigma, there are few limits to the range of customization options for the interior.
At 7,800 rpm the 4.2-liter engine delivers 309 kW (420 bhp) of power output. Peak torque is 430 Newton-meters from 4.500 to 6,000 rpm. And no less than 90 per cent of this maximum torque is maintained consistently throughout a wide engine speed range from 3,500 all the way to 7,600 rpm. As a result of these qualities, the eight-cylinder power unit provides ample thrust in most driving situation.
The engine is a high-revving unit. The maximum engine speed is 8,250 rpm. Two transmissions are available: a manual 6-speed gearbox or optionally the Audi R tronic sequential-shift gearbox, with a joystick gear-shift on the center console and, most especially, the paddles mounted on the steering wheel. 'Shift by wire' technology provides for very fast gear-shifting and an outstanding power-to-weight ratio, allied to compact gearbox dimensions. The Sport mode, with its fast shifting, guarantees the absolute maximum in terms of driving fun. An automatic mode can also be selected.
The car is fitted with permanent four-wheel drive, which distributes the power variably to the front and rear axles by way of a viscous clutch. On the Audi R8 the legendary quattro system is adapted to the axle load distribution typical of mid-engined cars.
The chassis features forged aluminum double wishbones at the front and rear. At the front they are triangulated, while at the rear the top one is triangulated and the bottom one is a triangulated wishbone with a track rod. This provides for optimum wheel control, and is a geometry which has proved itself to be the ideal solution in delivering agility, maximum steering precision and precisely defined self-steering characteristics.
Direct, hydraulic rack-and-pinion steering provides optimum feedback to assist the driver.
The spring and damper set-up is stiff in order to deliver maximum driving dynamics, while still providing a quite astonishing level of ride comfort. This is particularly true when the 'Audi magnetic ride' adaptive damper system is chosen as an alternative to the standard gas-filled shock absorbers.
Instead of the conventional damper fluid, a magnetorheological fluid is used -- in other words, a fluid whose viscosity can be influenced by an electromagnetic field. This effect enables the damping characteristic to be influenced electronically at will and instantaneously, by applying a voltage to the electromagnets.
Audi magnetic ride uses this property to deliver the correct damping forces in every driving situation. A computer determines the prevailing driving situation in a matter of milliseconds. Drivers can choose from two driving programs depending on whether they want to drive in a highly sporty style -- with the magnetorheological fluid adjusted to a low viscosity -- or with the emphasis more on ride comfort.
The Audi R8 is fitted with 6-arm 18-inch wheels as standard, and can optionally be ordered with 19-inch wheels. The 235/40 size tires at the front and up to 285/35 at the rear provide the necessary road-holding. The mid-engined sports car's long wheelbase and extremely low center of gravity ensure that it always retains maximum stability.
Equipment and trim
Xenon plus lights, LED rear lights and daytime running lights, 18-inch aluminium wheels, an audio system with 7-inch monitor, an anti-theft alarm and Leather/Alcantara interior trim are just some of the items on the extensive list of standard features.
The range of optional extras includes a Bang & Olufsen sound system, featuring an output of 465 watts and 12 specially designed speakers. A microphone-based vehicle noise compensation system adjusts audio levels to changing road conditions and speeds.
The acoustic parking system and a rear-view camera help the driver to maneuver into even the tightest of spaces. The radio/navigation system plus, featuring a large-format color monitor and MMI keypad, combines extensive functionality with extreme user-friendliness.
A total of eight exterior colors are available, from Ibis White to Phantom Black, pearl effect.Craftsmanship
The Audi R8 is being built on a small-lot production line in a specially constructed new block at the Audi plant in Neckarsulm. The entire production process -- from the bodyshell construction to final assembly -- is organized in the same way as a craft workshop. Small teams of specialists accompany every step of production, ensuring that every one of the maximum of 15 cars per day built is up to quality standards.