TDI and TFSI engine

Inside the engine of the Audi A3 you’ll find the same advanced fuel-injection technology that’s driven us to win after win at Le Mans. With TDI and TFSI, fuel is injected directly into the engine’s chambers so that combustion is timed right down to the millisecond. As a result, waste is minimised and you get the most from every last drop of fuel.



FSI direct-injection technology is a unique Audi innovation that was originally developed for the Le Mans 24-hour endurance race to deliver more power and torque, as well as enhanced fuel efficiency. Precisely the right amount of fuel and air are injected into the combustion chambers, enabling the engine to ‘breathe’ more easily. It results in reduced heat loss and increased output, with around a 15% reduction in fuel consumption and significantly lower exhaust emissions. We’ve also developed TFSI, with turbocharging – giving cars an extra injection of power. This combined with Cylinder-on-demand technology improves fuel efficiency considerably.



We introduced TDI to the roads in 1989, and since then, we’ve continuously refined it, including developing common-rail technology. Under this system, a series of piezo injectors uses electrical charge to precisely control the amount of fuel injected into the engine. As well as reducing noise, this allows combustion to happen at a lower temperature, with less oxygen, which lowers emissions.

S tronic

S tronic Transmission

Driving is all about thinking ahead, which is just what the S tronic dual-clutch transmission does. It works almost as two separate systems, one engaging the odd-numbered and the other the even-numbered gears. So when you’re accelerating in second, it has third gear waiting for you. And once you make the switch, it’s already thinking about fourth. With two clutches working together, you can change gears almost instantly while experiencing smooth, uninterrupted power.