New Audi 1.8 TFSI Engine: 170 HP and 5.7L/100Km

The brand with four rings today released details regarding its completely revised 1.8 TFSI engine, which will be fitted in the updated Audi A5 family. The turbocharged four-cylinder gasoline unit comes as the base engine - for Europe, and is capable of delivering 170 horsepower and 236 lb.ft. (320Nm), while returning 5.7l/100km (41.27 US mpg).

This means consumption has been reduced by 21 percent compared with the previous model engine.

With a manual transmission, the 1.8 TFSI accelerates the Audi A5 Coupe from zero to 100 km/h (62.14 mph) in 7.9 seconds on its way to a top speed of 230 km/h (142.92 mph). All while emitting just 134g/km of CO2.

“Combustion behavior was a particular focus of the development work,” Audi explains. In addition to FSI direct injection, the 1.8 TFSI also uses indirect injection. This system injects the fuel at the end of the intake manifold near the tumble valves, where it is swirled intensively with the air. Indirect injection is used in the part-load range.

It reduces fuel consumption and particulate emissions to such an extent that the four-cylinder engine already complies with the limits of the future Euro 6 standard, which does not enter into force until 2015.

The rail pressure of the FSI system has been increased from 150 to 200 bar. The direct injection system is active when starting off and at higher loads. It can perform two or three individual injection operations per work cycle. To further optimize gas exchange, the valve control system has been given greater operating freedom. The Audi valvelift system, which adjusts the lift of the valves in two stages, is active on the exhaust side. The two camshafts can be adjusted through 30 or 60 degrees of crankshaft angle.