A second innovation rounds out the program: The 2.0 TFSI now is also available with quattro all-wheel drive.The 1.8 TFSI is a high-tech engine that combines all of the features of modern engine technology. It is highly compact, and at just 135 kilograms (297.62 lb), it is unusually light. An adjustable intake camshaft improves the process of filling the combustion chambers, while two balancing shafts refine the engine’s running character. Thanks to a new type of demand-based control strategy, the oil pump uses minimal energy and therefore contributes to lower fuel consumption. The pump delivers only the amount of oil needed by the engine in its current mode of operation.
With the direct fuel injection featured by the new entry-level engine, fuel is injected directly into the four-valve cylinder head at 150 bar pressure from a high-pressure accumulator through newly developed, six-hole injectors. There it mixes with air that is set into a swirling motion by flaps in the intake manifold.
The mixture is homogenous; 14.7 parts of air are added to one part fuel. Evaporation of the directly injected fuel cools the combustion chamber, which – when combined with turbocharging – provides a high compression ratio. The charger is designed to react swiftly to demand so that the engine quickly reaches maximum torque and remains at this high level for long periods. The result is high elasticity at any rpm. |
