Audi: New 1.8 TFSI engine

Audi launched a new 1.8 TFSI engine at the Paris Motor Show.

Ultra-fine fuel jets, precisely distributed

Audi regards FSI technology with turbocharging, now systematically refined for the new engine, as the best way to achieve all these objectives. With FSI technology, fuel is injected directly into the combustion chamber. The new 1.8 TFSI does this at a maximum pressure that has been increased to 150 bar. Together with the new six-hole injectors and air movement in the combustion chamber controlled by charge movement flaps, it guarantees highly homogeneous mixture preparation and very efficient combustion. This supports the engine's agile characteristics and spontaneous power output, as well as its very low fuel consumption in practice.

A new type of high-pressure pump supplies this injection pressure. The pump is driven by a four-fold cam on the exhaust camshaft. This reduces the operating forces required and boosts precision, thus improving the emissions. The high-pressure lines through which the fuel reaches the injectors at maximum pressure are made entirely from stainless steel. The new six-hole nozzles distribute the ultra-fine fuel jets with precision inside the combustion chamber. Dual injection – the distribution of the fuel quantity between the admission stroke and the compression stroke – brings further advantages for the homogenisation of the mixture and heating of the catalytic converters after a cold start.

Turbocharger with improved aerodynamics

The watercooled turbocharger K03, from Borg Warner, maintains optimum cylinder filling. An optimised turbine wheel improves the aerodynamics inside the charger, as a result of which responsiveness lower down the engine range is further enhanced. In the intake system, the redesigned charge movement flap reduces flow losses and simultaneously assures a very homogeneous distribution of the mixture.

The result is an exceptionally spontaneous engine response to the accelerator at all engine speeds: at just 1,000 rpm, the new 1.8 TFSI develops a torque of 165 Nm, with maximum torque available very early on and across the extremely broad range of 1,500 to 4,200 rpm. The peak output of 160 bhp is likewise maintained across an extremely broad plateau of 5,000 to 6,200 rpm. This permits economical gearing that is nevertheless of a sporty character. With a compression ratio of 9.6:1, the engine is designed to run on premium-grade fuel (95 RON). In the A3 with manual gearbox, the combined-cycle fuel consumption is consequently a modest 7.3 l per 100 km.

Career plan as a universal engine

With these genes, the new 1.8 TFSI has the potential to keep on satisfying the toughest emission limits in the world. After all, it is destined for a career as a true "universal engine". The highly promising new engine that offers ample scope for further development will be going into production simultaneously at Audi's engines plant in Gyцr, Hungary, and in Dalian, China, in autumn 2006, when it will become the first petrol direct-injection engine on the Chinese market. The TFSI concept is likewise ideally equipped for use in the USA and South America, where fuel grades to some extent vary considerably.

Related news: GermanCarBlog, P4MR, Audi

Source: AudiWorld

Audi: New 1.8 TFSI engine

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