Technology

TFSI

Audi was the first manufacturer in the world to combine petrol direct injection with turbocharging in large-scale car production. The success story of the 2.0 TFSI was launched in summer 2004 when it debuted in the Audi A3 Sportback.

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Compared with conventional naturally aspirated V6 engines, a turbocharged direct-injection four-cylinder engine delivering the same performance uses 10 to 15 percent less fuel.

FSI technology and turbocharging make such an excellent combination because the evaporation of fuel directly within the combustion chamber in FSI engines removes heat from the intake air. This allows a higher compression, significantly improving engine efficiency. It also solves an old problem in all turbocharged engines – a high tendency to knock at high boost levels.

The integrated turbocharger exhaust manifold module ensures optimum turbine efficiency, resulting in excellent utilisation of the exhaust energy. This achieves both a high power output and optimum engine responsiveness, ultimately helping to reduce fuel consumption and exhaust emissions.

The second generation of 2.0 l TFSI engines, which were introduced in the Audi A4, A5 and Audi Q5 in 2008, featured for the first time valve lift control in the form of the Audi valvelift system on the exhaust side. Significantly improved torque was the result with better low-end torque and a more effective dynamic torque build-up. Alongside performance improvements, these optimisations were also translated into taller gear ratios, bringing about a further reduction in fuel consumption.

The combination of petrol direct injection and a mechanical supercharging module makes the 3.0 l V6 engine, fitted in selected Audi models, a compact power plant with an early maximum torque of 400 Nm sustained over a wide power band – with moderate fuel consumption. With its very spontaneous response and an extraordinary power flow across the entire rpm range, the six-cylinder unit also permits a particularly dynamic driving style.

By bringing together supercharging and petrol direct injection, TFSI unlocks a superior potential: greater power output and more dynamic performance with lower fuel consumption.