2012-2013 Audi S8 (D4) 4.0 TFSI V8 (520 Hp) quattro Tiptronic

Technical Specifications

The Audi S8 (D4) 4.0 TFSI V8 quattro Tiptronic, produced from April 2012 through 2013, represented the high-performance pinnacle of the fourth-generation (D4) Audi A8 flagship sedan. Positioned as the top-tier offering, it combined a potent twin-turbocharged V8 engine with Audi’s quattro all-wheel-drive system and an eight-speed Tiptronic automatic transmission. The D4 S8 was built upon the A8 (D4) platform (1HX0), sharing its core structure but distinguished by its more aggressive styling, upgraded suspension components, and significantly more powerful engine. It directly competed with performance-oriented luxury sedans from BMW and Mercedes-Benz, aiming to deliver a blend of exhilarating acceleration, sophisticated technology, and refined comfort.

Powertrain & Engine Architecture

The heart of the D4 S8 is the 4.0 TFSI engine, internally designated CGTA. This engine is a 3,993 cc (243.67 cu. in.) V8, constructed primarily from aluminum alloy to reduce weight. It utilizes direct fuel injection, delivering fuel directly into the combustion chambers for improved efficiency and power. Crucially, the engine employs twin turbochargers – one for each cylinder bank – to significantly boost output. These turbochargers are integrated into the exhaust manifolds, a design choice that minimizes turbo lag and provides a broad, usable torque curve. The engine is paired with a sophisticated eight-speed Tiptronic automatic transmission, offering both fully automatic operation and manual gear selection via steering wheel-mounted paddles. This transmission is engineered for quick, smooth shifts and contributes significantly to the car’s overall performance. A complex engine management system optimizes fuel delivery, ignition timing, and other parameters for maximum power and efficiency.

Driving Characteristics

The 4.0 TFSI engine in the S8 delivers a remarkably smooth and powerful driving experience. The twin-turbochargers provide near-instantaneous response, and the substantial 650 Nm (479.42 lb-ft) of torque available from just 1700 rpm ensures effortless acceleration in virtually any gear. The Tiptronic transmission shifts quickly and seamlessly, contributing to the car’s impressive 4.2-second 0-60 mph time. Compared to the standard A8’s engine options, the S8 offers a dramatically more engaging and dynamic driving experience. While the standard A8 prioritizes comfort and refinement, the S8’s sport-tuned suspension and more responsive engine transform it into a true driver’s car. The quattro all-wheel-drive system provides exceptional grip and stability, particularly beneficial in inclement weather or during spirited driving. The steering is precise and well-weighted, further enhancing the driving experience.

Equipment & Trim Levels

The S8 came standard with a comprehensive suite of luxury and technology features. Interior appointments included premium leather upholstery, heated and ventilated front seats with massage functionality, and a choice of wood or carbon fiber trim. Standard technology included Audi’s MMI infotainment system with navigation, a high-end Bang & Olufsen sound system, and advanced driver-assistance systems such as adaptive cruise control, lane departure warning, and blind-spot monitoring. Optional extras included a rear-seat entertainment system, night vision assist, and high-performance ceramic brakes. The S8’s interior was meticulously designed to provide a luxurious and comfortable environment for both the driver and passengers, emphasizing high-quality materials and advanced technology.

Chassis & Braking

The S8 featured a sport-tuned suspension system designed to enhance handling and stability. The suspension utilized adaptive air suspension, allowing the driver to adjust the ride height and damping characteristics to suit their preferences and driving conditions. Braking duties were handled by large, ventilated disc brakes on all four wheels, providing ample stopping power and fade resistance. The S8 also featured Audi’s electronic stability control (ESC) system, which helps to prevent skidding and maintain control in challenging driving situations. The chassis itself was reinforced in key areas to handle the increased power and torque output of the 4.0 TFSI engine, ensuring structural rigidity and improved handling.

Market Reception & Comparison

The Audi S8 (D4) 4.0 TFSI was generally very well-received by automotive critics. It was consistently praised for its powerful engine, luxurious interior, advanced technology, and refined driving experience. Some critics noted that its fuel economy was relatively poor compared to some of its competitors, a common trade-off for high performance. Compared to other trims in the A8 lineup, the S8 offered a significantly more engaging driving experience and a higher level of performance. Against rivals like the BMW 750i and Mercedes-Benz S63 AMG, the S8 offered a compelling combination of performance, luxury, and technology, often at a slightly more competitive price point. It was seen as a strong contender in the high-performance luxury sedan segment.

Legacy

The CGTA engine, while powerful, has proven to be reasonably reliable, though preventative maintenance is crucial for long-term durability. Common issues include carbon buildup on the intake valves – a characteristic of direct-injection engines – and potential oil leaks from various seals. The Tiptronic transmission is generally robust, but regular fluid changes are essential to ensure smooth operation and prevent premature wear. Today, the D4 S8 remains a desirable used car, offering a significant amount of performance and luxury for the price. Its sophisticated technology and powerful engine continue to impress, making it a compelling choice for buyers seeking a high-performance luxury sedan. The car represents a sweet spot in terms of technology and reliability, offering modern features without the complexity of some newer vehicles.