2013-2017 Audi A8 (D44H facelift ) 4.0 BiTFSI V8 (435 Hp) quattro Tiptronic

The Audi A8 (D4, 4H facelift) 4.0 BiTFSI V8 quattro Tiptronic represents the pinnacle of performance and luxury within the D4 generation of Audi’s flagship sedan, produced from 2013 to 2017. This variant, positioned as the top-tier engine option, offered a significant step up in power and refinement compared to the A8’s other engine choices, including the 3.0-liter supercharged V6 and the 4.2-liter naturally aspirated V8 that preceded it. The facelift brought updated styling, enhanced technology, and further refinement to the already sophisticated A8 platform, solidifying its position as a competitor to the BMW 7 Series and Mercedes-Benz S-Class.

Technical Specifications

INTRODUCTION

The Audi A8 (D4, 4H facelift) 4.0 BiTFSI V8 quattro Tiptronic, produced between 2013 and 2017, represents a high-performance iteration of Audi’s flagship luxury sedan. Built on the Volkswagen Group’s D4 platform (also underpinning the Bentley Continental GT and Porsche Panamera), the A8 aimed to deliver a blend of opulent comfort, cutting-edge technology, and dynamic driving experience. The 4.0 BiTFSI V8 variant sat at the top of the A8 range, offering significantly more power and performance than the 3.0 TFSI supercharged V6 and the earlier 4.2 FSI naturally aspirated V8 models. This model was primarily marketed in North America, Europe, and Asia, catering to buyers seeking a luxurious and powerful executive sedan.

Powertrain & Engine Architecture

At the heart of the A8 4.0 BiTFSI lies the CTGA engine, a 3,993 cc (243.67 cu. in.) twin-turbocharged V8. This engine utilizes direct fuel injection and a dual-scroll turbocharger configuration to deliver 435 horsepower at 5,100-6,000 rpm and a substantial 600 Nm (442.54 lb.-ft.) of torque between 1,500 and 5,000 rpm. The engine features a 10.1:1 compression ratio and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The ‘BiTFSI’ designation signifies Audi’s use of both turbocharging and direct injection technologies. The engine’s sophisticated engine management system optimizes fuel delivery and ignition timing for both performance and efficiency. Paired with the engine is an eight-speed Tiptronic automatic transmission, offering smooth and responsive gear changes. This transmission allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles or the gear selector lever.

Driving Characteristics

The A8 4.0 BiTFSI delivers a remarkably refined and powerful driving experience. The twin-turbo V8 provides effortless acceleration, with a 0-60 mph time of around 4.3 seconds. The eight-speed Tiptronic transmission is well-matched to the engine’s characteristics, providing quick and seamless shifts. The quattro all-wheel-drive system ensures excellent traction and stability in all weather conditions. Compared to the 3.0 TFSI, the 4.0 BiTFSI offers a significantly more potent surge of power, particularly during overtaking maneuvers. While the 4.2 FSI offered a more traditional V8 sound, the 4.0 BiTFSI prioritizes performance and efficiency. The A8’s adaptive air suspension contributes to a comfortable ride, while also offering adjustable damping settings to prioritize sportiness when desired. The steering is precise and well-weighted, providing a confident feel on the road.

Equipment & Trim Levels

The A8 4.0 BiTFSI typically came standard with a comprehensive array of luxury features. These included leather upholstery, heated and ventilated front seats with massage function, a premium sound system (often Bang & Olufsen), a navigation system with MMI touch response, adaptive cruise control, and a panoramic sunroof. Optional extras included rear-seat entertainment, a head-up display, and various interior trim options. The A8’s interior was characterized by its high-quality materials, meticulous craftsmanship, and advanced technology. The dashboard layout was clean and elegant, with a focus on user-friendliness.

Chassis & Braking

The A8 4.0 BiTFSI features an independent multi-link suspension at the front and an independent trapezoidal lever suspension at the rear. This suspension setup provides a comfortable ride and precise handling. The car is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability control (ESC) system and anti-lock braking system (ABS) work in conjunction to enhance safety and stability. The A8’s chassis is constructed from aluminum, contributing to its relatively low weight and improved handling characteristics.

Market Reception & Comparison

The Audi A8 4.0 BiTFSI was generally well-received by automotive critics. It was praised for its powerful engine, luxurious interior, advanced technology, and refined driving experience. Compared to its rivals, the BMW 750i and Mercedes-Benz S550, the A8 offered a unique blend of German engineering and understated elegance. Fuel economy was respectable for a vehicle of its size and performance, averaging around 25.8 US mpg in combined driving. Reliability was generally good, although some owners reported minor issues with the infotainment system and air suspension.

Legacy

The Audi A8 (D4) 4.0 BiTFSI V8 quattro Tiptronic remains a desirable luxury sedan in the used car market. Its powerful engine, luxurious features, and advanced technology continue to appeal to buyers seeking a high-performance executive car. The CTGA engine has proven to be relatively durable, although regular maintenance is essential to ensure long-term reliability. The A8’s sophisticated all-wheel-drive system and comfortable ride make it a capable and enjoyable vehicle for both long-distance cruising and daily commuting. As a flagship model, the A8 4.0 BiTFSI represents a significant achievement in Audi’s engineering and design capabilities.