The Audi S4, a performance-oriented version of the Audi A4, has a rich history of combining luxury with exhilarating driving dynamics. A key element in achieving this performance is the use of turbocharging. For those wondering, "what year did the Audi S4 become turbocharged?", the answer lies in understanding the evolution of the S4 across its different generations. Let's dive into the specifics of when Audi introduced turbocharging to the S4, exploring the engine configurations and performance enhancements that came with this technology.

The First Turbocharged Audi S4: The B5 Generation (1997-2002)

The B5 generation Audi S4, produced from 1997 to 2002, marks the first instance of turbocharging in the S4 model line. This generation is powered by a 2.7-liter twin-turbocharged V6 engine. This engine, known as the 2.7T, produces a factory-rated output of 250 horsepower and 258 lb-ft of torque. However, the actual output is often debated, with many enthusiasts suggesting that the engine's true potential was somewhat understated by Audi. The introduction of the twin-turbo setup was a significant step up from the naturally aspirated engines found in earlier Audi performance models. The B5 S4 quickly gained popularity among tuners and enthusiasts due to its relatively easy modification and the significant power gains that could be achieved with simple bolt-on upgrades and ECU tuning.

The 2.7T engine features a robust design, capable of handling considerable power increases with supporting modifications. This made the B5 S4 a favorite for those looking to extract maximum performance from their vehicles. The engine's architecture includes an iron block and aluminum cylinder heads, providing a good balance of durability and weight savings. The twin-turbochargers are relatively small, designed to provide quick spool-up and minimal lag, contributing to the car's responsive and engaging driving experience. The B5 S4 was available with both a 6-speed manual transmission and a 5-speed automatic transmission, offering options for different driving preferences. The manual transmission is generally preferred by enthusiasts for its greater control and more direct connection to the engine. The B5 S4 also features Audi's signature quattro all-wheel-drive system, providing excellent traction and stability in various driving conditions. This system helps to distribute power evenly between the front and rear axles, enhancing handling and performance, particularly in adverse weather conditions. In summary, the B5 S4 was a groundbreaking model that set the stage for future turbocharged S4s, establishing a benchmark for performance and tunability.

The B6 and B7 Generations (2003-2008): A Hiatus from Turbocharging

The B6 and B7 generation Audi S4s, produced from 2003 to 2008, took a detour from turbocharging, opting instead for a naturally aspirated engine. These models feature a 4.2-liter V8 engine that delivers a smooth and linear power band. While these generations moved away from turbocharging, it’s essential to understand why Audi made this choice and how it affected the driving experience. The B6 S4, introduced in 2003, marked a significant departure from the twin-turbocharged B5 S4. The 4.2-liter V8 engine produces 340 horsepower and 302 lb-ft of torque, offering a different kind of performance. The naturally aspirated V8 provides a more immediate throttle response and a distinctive exhaust note that many enthusiasts appreciate.

Audi's decision to switch to a naturally aspirated engine was driven by a desire to offer a more refined and sophisticated driving experience. The V8 engine delivers power in a linear fashion, without the sudden surge associated with turbocharging. This makes the car feel more predictable and easier to control, especially in everyday driving situations. The B6 and B7 S4s were designed to appeal to a broader audience, not just hardcore performance enthusiasts. The V8 engine also contributes to a more luxurious and upscale feel, aligning with Audi's brand image. These generations were available with either a 6-speed manual transmission or a 6-speed automatic transmission, providing options for different driving preferences. The manual transmission offers a more engaging driving experience, while the automatic transmission provides greater convenience and ease of use. The quattro all-wheel-drive system remains a standard feature, ensuring excellent traction and stability in all weather conditions. While the B6 and B7 S4s may not offer the same tunability as the B5 S4, they still provide a rewarding driving experience with their smooth power delivery and refined handling. The naturally aspirated V8 engine delivers a distinctive sound that is both pleasing and exhilarating, adding to the overall appeal of these models. In conclusion, the B6 and B7 generations represent a departure from turbocharging, focusing instead on delivering a more refined and sophisticated driving experience with a naturally aspirated V8 engine.

The B8 Generation (2009-2016): Return to Supercharging

With the B8 generation Audi S4, produced from 2009 to 2016, Audi reintroduced forced induction, but this time in the form of supercharging rather than turbocharging. This generation features a 3.0-liter supercharged V6 engine. The reintroduction of forced induction in the B8 S4 marked a significant shift from the naturally aspirated V8 engines of the B6 and B7 generations. Audi opted for a supercharger rather than a turbocharger to achieve a more immediate and linear throttle response. The 3.0-liter supercharged V6 engine produces 333 horsepower and 325 lb-ft of torque, delivering strong performance across the rev range. The supercharger provides instant boost, eliminating the lag that can sometimes be associated with turbochargers.

This results in a more responsive and engaging driving experience, with power readily available at all times. The supercharged engine also offers a distinctive sound, with a noticeable whine that adds to the car's sporty character. The B8 S4 was available with either a 6-speed manual transmission or a 7-speed S tronic dual-clutch transmission. The dual-clutch transmission provides incredibly fast and smooth gear changes, enhancing both performance and driving enjoyment. The quattro all-wheel-drive system remains a standard feature, ensuring excellent traction and stability in all weather conditions. The B8 S4 also features improved handling dynamics, with a more balanced chassis and responsive steering. This makes the car feel more agile and confident in corners, enhancing the overall driving experience. The supercharged engine in the B8 S4 offers a compelling combination of performance, efficiency, and refinement. It delivers strong power across the rev range, with minimal lag and a distinctive sound. The B8 S4 is a well-rounded performance sedan that offers a rewarding driving experience for enthusiasts and everyday drivers alike. In summary, the B8 generation represents a return to forced induction with a supercharged V6 engine, delivering a more responsive and engaging driving experience.

The B9 Generation (2017-Present): Turbocharging Returns

The B9 generation Audi S4, introduced in 2017 and still in production, sees Audi reverting to turbocharging. This model is powered by a 3.0-liter turbocharged V6 engine. With the B9 S4, Audi returned to turbocharging, leveraging the technology's efficiency and power potential. The 3.0-liter turbocharged V6 engine produces 349 horsepower and 369 lb-ft of torque, delivering strong performance and impressive fuel economy. The turbocharger provides a significant boost in power and torque, making the B9 S4 one of the quickest and most capable models in the S4 lineup. The engine is designed to deliver strong performance across the rev range, with minimal lag and a broad powerband.

The B9 S4 is available exclusively with an 8-speed automatic transmission, which provides smooth and precise gear changes. The transmission is optimized for both performance and efficiency, helping to maximize the engine's potential. The quattro all-wheel-drive system remains a standard feature, ensuring excellent traction and stability in all weather conditions. The B9 S4 also features advanced technology, including a virtual cockpit display, driver assistance systems, and connectivity features. These technologies enhance the driving experience and provide added convenience and safety. The turbocharged engine in the B9 S4 offers a compelling combination of performance, efficiency, and refinement. It delivers strong power and torque, with minimal lag and a broad powerband. The B9 S4 is a well-rounded performance sedan that offers a rewarding driving experience for enthusiasts and everyday drivers alike. The return to turbocharging in the B9 S4 reflects Audi's commitment to innovation and performance. The turbocharged engine delivers strong power and torque, while also providing improved fuel economy compared to previous generations. In conclusion, the B9 generation represents a return to turbocharging, delivering strong performance and efficiency with a 3.0-liter turbocharged V6 engine.

Conclusion

So, to definitively answer the question, the first turbocharged Audi S4 was the B5 generation, produced from 1997 to 2002. While subsequent generations experimented with naturally aspirated engines and supercharging, Audi has since returned to turbocharging with the B9 generation. Each approach has its own merits, contributing to the diverse and engaging driving experiences offered by the Audi S4 throughout its history. Whether you prefer the raw power of a twin-turbo V6, the smooth delivery of a naturally aspirated V8, the instant boost of a supercharged V6, or the modern efficiency of a turbocharged V6, the Audi S4 has something to offer every performance enthusiast.