Torque levels are adequate, as not only does it produce 320 Nm (236 lb-ft), but this is available from as low as 1,450 to 4,400 rpm.
A new philosophy: rightsizing, not downsizing
To be honest, we don't think downsizing works as well as it should. In a laboratory or out on a perfect test track, small 3-cylinder turbos seem fine. However, in the real world, you need to rev the engine more, which hurts the economy.
Audi have started a new trend with this engine, what they call "rightsizing". Basically, they take into account the vehicle class and what the everyday use is like. We'll just leave somebody who understands it better to explain it, like the Audi Technical Director:
“Rightsizing thus involves the optimal interplay of vehicle class, displacement, output, torque and efficiency characteristics under everyday conditions. Our new 2.0 TFSI is a prime example of Vorsprung durch Technik.”
At 140 kg (308.6 lb), the new TFSI is relatively light and has been packed with features, such as exhaust manifold integrated into the cylinder head, low friction parts and a controlled cooling system to cut the warm-up time.
However, the major fuel saving advantages come from a new combustion method similar to the Miller cycle. Here are the major factors involved:
- The intake time has been shortened (140° crank angle (CA) rather than 190 to 200° CA).
- Owing to a higher boost pressure on the inlet side, the engine attains optimal cylinder charges despite the shorter intake time.
- The intake valve also closes earlier – well before the bottom dead center is reached. This lowers the medium pressure, allowing a high, efficiency-boosting compression ratio.
- In the partial load range, an additional injection upstream from the intake valve yields an efficient mixture formation that is already complemented by the direct injection in the intake manifold and in the combustion chamber. (essentially, indirect injection is used)
- The Audi Valvelift System (AVS) on the inlet side allows a short intake time at partial load and a longer time at higher loads (full load: 170° CA).