Audi. Friday , October 13th , 2017 - 02:32:28 AM
In the induction tract, the intake valves close well before the piston reaches bottom dead center. This very short opening time keeps the fresh gas flow comparatively small. When the piston moves back up again after reaching bottom dead center, the compression phase starts later than usual. This allows a high geometric compression ratio of 10.0:1 - the combustion then takes place in a relatively small volume. In comparison to the short compression phase, the expansion phase is extended, which results in a high level of efficiency.
Both turbochargers of the 2.9 TFSI unit are centrally positioned inside the V of the engine and each of them supplies a single cylinder bank. The B-cycle combustion process with central direct injection represents a new level of efficiency within the RS family. In the NEDC, the V6 bi-turbo consumes just 8.7 liters of fuel per 100 kilometers (27.0 US mpg), which corresponds to 197 grams of CO2 per kilometer (317.0 g/mi). This is an efficiency gain of 17 percent over the previous model. Also beneficial for the new Audi RS5 Coupe is a drastic reduction in weight. The vehicle weighs in at 1,655 kilograms (3,648.7 lb) - 60 kilograms (132.3 lb) less than previously. A carbon roof with visible fiber structure is also available as an option.
The fast, spontaneously and sportily shifting eight-speed tiptronic with optimized shift times is standard on the new Audi RS5 Coupe. The layout of its gear sets and shifting elements results in low drag torques and thereby to a high efficiency level. Its large number of gears very frequently makes it possible to operate the engine close to its ideal load point. The lower gears have short, sporty ratios, while the upper gears are long in order to reduce revs and fuel consumption.
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