Kiera Shaw. Audi. October 13th , 2017.
From 1,900 to 5,000 rpm, the 2.9 TFSI supplies the crankshaft with an impressive 600 Nm (442.5 lb-ft) of torque, which is 170 Nm (125.4 lb-ft) more than on the previous model. With its 331 kW (450 hp) - which equates to a power ratio of 155.5 hp per liter displacement - the unit accelerates the new RS5 Coupe from zero to 100 km/h (62.1 mph) in 3.9 seconds and thus six tenths of a second faster than before. If the customer orders the RS dynamic package, Audi increases the electronically restricted top speed from 250 km/h (155.3 mph) to 280 km/h (174.0 mph).
With the newly developed 2.9 TFSI, Audi has drawn upon the legendary 2.7 liter V6 from the first RS4 Avant. Produced between 1999 and 2001, it delivered 280 kW (380 hp). Just like the 2.7 liter engine, the new high-performance V6 is also designed as a bi-turbo engine. In comparison with its direct predecessor, a freely-aspirated, high-revving V8 unit, its pulling power and efficiency attain a whole other dimension.
A further efficiency component of the 2.9 TFSI is the thermal management system. The crankcase and the cylinder head have separate coolant circuits. After a cold start, the switchable water pump controls the flow of coolant through the engine so that the oil is warmed up as quickly as possible. The exhaust manifolds are integrated in the cylinder head, and coolant circulates around them which helps ensure rapid warming up. When the engine is warm, this technology lowers the exhaust temperatures - consumption drops drastically, especially when driving in a sporty way. The great efficiency of the V6 bi-turbo is also partly to do with low friction. For example, the fully adjustable oil pump only builds up as much pressure as necessary.
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.
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