This is what makes Audi’s 2.5-litre TFSI engine the best 5-cylinder unit


Audi has a long-standing reputation for its 5-cylinder turbocharged engines. With the Audi 100 (C2), the brand introduced the first of these engines to the North American market in 1976. At the time, it delivered a decent power of 130 hp and seamlessly integrated with the 5-speed manual transmission. With its amazing power, the 5-cylinder engine became popular in the automotive world. Later, the powertrain became a staple in Audi’s lineup and was used successfully in production and race cars from then on. The five-cylinder era lasted until the late 1990s when the new V6 TFSI engine entered the picture.

But that was not the end of the 5-cylinder engine, as it made a stunning comeback with the introduction of the Audi TT RS. Still, as before, the bike received some incredible comments and reviews from motoring journalists and customers alike. With so many rumors about the engine’s capabilities, the 2.5 TFSI engine was voted “International Engine of the Year” in 2010 by an international panel of experts made up of 65 automotive journalists. It kept repeating the award for another 8 years – making it 9 times in a row. Then a new one 2.5-litre R5 TFSI engine of the EA855 EVO Series was introduced to replace the previous 2.5-litre R5 TFSI engine and made its North American debut last year in the Audi TT RS. The combination of direct fuel injection with turbocharger has given this engine more power.

Even today, these engines still impress gearboxes around the world. While North America hasn’t seen or experienced the 5-cylinder unit much (if at all) in the past, they do now. And the brand also used the engine in the Audi RS3 Sportback, where it delivers 394 horsepower at 7000 rpm and 368 lb.-ft of torque from 2250 to a redline of 5600 rpm. In combination with an optimally adapted six-speed automatic transmission, the engine provides powerful acceleration and reasonable fuel consumption.

We discuss the design of the 5-cylinder engine and everything that makes it special.

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Audi’s 2.5-litre TFSI is the world’s smallest and most powerful 5-cylinder engine

Due to the compact and small design of the engine, the 5-cylinder fits in the engine compartment when mounted transversely. It is easily the smallest and most powerful inline 5-cylinder engine in the world.

With the first five-cylinder petrol engine to power the 1976 C2, Audi added an extra cylinder to the four-cylinder system in an effort to increase displacement and overtake the competition. The construction of the five-cylinder engine gave the brand a stable name and market position in the 1980s, mainly because it not only gave the engine extra power, but also offered the same fuel consumption as a 4-cylinder.

Audi underwent extensive engine development for the new generation of the Audi TT RS. First, the engine was ramped up, raising the power to the 330+ horsepower range. Then aluminum components, such as the crankcase and pistons, were added to reduce weight. In the end, the 2.5-liter TFSI engine became 57.3 pounds lighter than its predecessor. Also, both consumption and emissions have been significantly reduced. According to Armin Pelzer, Head of Powertrain Application Development at Audi, they have also introduced a special valve light system that varies the stroke of the exhaust valves, flushing out losses in the combustion chamber while maintaining optimal exhaust flow to the turbocharger. This has 3 advantages: more torque, more responsiveness and the best fuel economy.

Not counting the cams, Audi’s 5-cylinder is essentially half the V10 of a Lamborghini Huracán, with nearly identical cylinder heads.

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The Audi’s 2.5-litre TFSI engine is extremely harmonious

One thing that makes the engine special is its distinctive sound, which is a combination of a number of factors. One thing is the odd number of cylinders (5 instead of 4 or 6). This creates discrete 5-cylinder harmonic frequencies.

Unlike any other engine, even the Germ brand, the pistons shoot up and down in a 1-2-4-5-3 firing order, which gives it a certain erratic operation and a unique sound that is more vocal and loud at any speed. is more emotional. In addition, under heavy loads, the exhaust duct valves are opened for a more intense sound.

The 2.5-litre 5-cylinder is not only the heart of the TT RS Roadster and the Audi TT RS Coupé, but also breathes life into the Audi RS 3 Sedan and the RS 3 Sportback. With this engine, the TT RS Roadster goes from 0 to 100 km/h in 3.9 seconds, while the Coupé version does this in two seconds less. However, the latter siblings RS 3 Sedan and RS 3 Sportback can accelerate in just 4.1 seconds. All four models have a standard top speed of 255 mph.