Dynamics and efficiency: Three new models at the IAA

[B]Elegant dynamics: Audi S5 Sportback[/B]

The S5 Sportback is the pinnacle of the new Sportback model line. This elegant, five-door coupé is propelled by a three-litre V6 with a mechanical compressor. The compact turbo engine delivers 333 bhp and 440 Nm of torque between 2,900 and 5,300 rpm.

The S5 Sportback sprints from 0 to 100km/h in 5.4 seconds [provisional figure]; its top speed of 250 km/h is limited by an electronic governor. Its combined economy figure of 8.1 liters/100 km [provisional figure] is the best in this power-output category.

The powertrain of the Audi S5 Sportback is no less exceptional: a seven-speed S tronic dual-clutch transmission and quattro permanent all-wheel drive are standard equipment.

Upon request, this combination can be further enhanced by the sport differential, which variably distributes power on the rear axle between the rear wheels. This new "top model" naturally features sports suspension and rides on 18-inch aluminium wheels fitted with 245/40 tyres; black brake calipers bear S5 emblems at the front. Speed-dependent servotronic steering is also standard.

[B]Extremely clean: Audi A4 3.0 TDI clean diesel quattro[/B]

Audi debuted the 3.0 TDI clean diesel engine in its Q7 SUV; now, the world's cleanest diesel technology will also be available in the best-selling A4.

A package of technologies provides innovative solutions for engines and the after-treatment of exhaust gas.

The engine features a new common-rail injection system (which generates up to 2,000 bars of pressure), innovative pressure sensors in the combustion chamber, and an especially high-performance exhaust recirculating system.

Collectively these measures ensure a highly efficient and low-emission combustion process. A novel DeNOX catalytic converter, integrated within the end of the exhaust system, reduces residual nitrogen oxides.

Just upstream of it, a pump injects an additive named AdBlue into the hot exhaust flow; there, this aqueous solution decomposes into ammonia - which splits the nitrogen oxides into nitrogen and water.

The A4 3.0 TDI clean diesel quattro already complies with the emission limits of the EU's Euro 6 standard, expected to become law in 2014. It is also very fuel-efficient, with the potential to cover up to 5.6 liters/100 km (Avant: 5.7 liters/100 km).

And this TDI engine is indeed a powerful performer, needing only 6.2 seconds (Avant: 6.3 seconds) to go from zero to 100 km/h. Top speed is electronically governed to 250 km/h. In conjunction with a six-speed tiptronic and quattro permanent all-wheel drive, this vehicle guarantees a high degree of comfort and superior traction.

[B]Efficient Downsizing: Audi A3 and A3 Sportback 1.2 TFSI[/B]

Downsizing is an element of Audi's efficiency strategy to which it is absolutely committed. The A3 model line will soon introduce yet another turbocharged petrol engine featuring lower displacement. It unites maximum performance with minimum consumption.

Designed from scratch, the new 1.2 TFSI generates 105 bhp from a displacement of 1.2 liters. And as is typical of Audi, turbocharging and direct petrol injection once again work in harmony to maximise efficiency. Thanks to an aluminium crankcase, this four-cylinder engine weighs just 89.5 kilograms; this remarkably low weight also boosts its efficiency.

The 1.2 TFSI has been optimized to minimize friction. Eight valves are actuated by a single camshaft. A common-rail system injects the fuel. An electric control valve operates the turbocharger's wastegate valve; boost pressure builds up spontaneously and scavenging losses drop.

This compact engine generates 175 Nm of torque between just 1,500 and 3,500 rpm. It propels the three-door A3 1.2 TFSI from 0 to 100 km/h in 11.1 seconds; the Sportback, in 11.3 seconds.

Both versions reach a top speed of 190km/h and can return up to 4.6 liters/100 km (combined cycle), while emitting just 127 grams of CO2 per kilometre. The new engine will initially be paired with front-wheel drive and a six-speed manual transmission.

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Credits: JRC