Intelligent efficiency: the 1.4 TFSI COD ultra
The 1.4 TFSI COD ultra has a displacement of 1,395 cm3 and delivers 110 kW (150 hp); its 250 Nm (184.4 lb-ft) torque is available at 1,500 to 3,500 rpm.
The sprint from 0 to 100 km/h (62.14 mph) takes just 8.1 seconds in the new Audi A3, the thrust ends at 220 km/h (136.7 mph) It consumes on average 4.5 liters per 100 kilometers (52.3 US mpg), corresponding to 105 grams CO2 per kilometer (169.0 g/mile) (manual transmission).
The four-cylinder engine comes with a technology package similar to that of the 1.0 TFSI and additionally offers the pioneering efficiency technology COD (cylinder on demand). At loads up to 100 Nm (73.8 lb-ft), and when coasting, the system deactivates the second and third cylinders, provided that the engine speed lies between 1,400 and 4,000 rpm.
Electromagnetically extended pins move the cam pieces on the cam shafts – sleeves that each carry two different cam sections. When the zero-stroke profiles are rotating above the valves, they do not actuate the valves, and the valve springs keep them closed. Injection and ignition are deactivated. The switchover process takes just milliseconds. The operating points in active cylinders one and four are displaced toward higher loads, increasing efficiency. Even with a firing angle of 360 degrees, vibration of the 1.4 TFSI COD is still very low and the engine is quiet. When the accelerator pedal is depressed, the shut-down cylinders are reactivated.