Audi RS 3 Sportback

Blazing performance, compact size. Audi has added a new model to its dynamic RS series: the RS 3 Sportback. In the great tradition of the brand, its engine boasts five cylinders and turbocharging technology. From a displacement of 2.5 liters come 250 kW (340 hp) of power and 450 Nm (331.90 lb-ft) of torque, with an average fuel consumption of just 9.1 liters of fuel per 100 km (25.85 US mpg). 

Power is transmitted to the road via a seven-speed S tronic and quattro permanent all-wheel drive. 19-inch wheels and fenders made of carbon fiber reinforced plastic (CFRP) underscore the Audi RS 3 Sportback’s position of distinction.

Each Audi RS model represents the pinnacle of its model line – the RS 3 Sportback, developed by quattro GmbH, now brings this dynamic philosophy to the compact category. It rockets from a dead stop to 100 km/h (62.14 mph) in 4.6 seconds – a performance figure unrivaled by the competition. Top speed is electronically limited to 250 km/h (155.34 mph). Even so the compact car, weighing in at only 1,575 kilograms (3,472.28 pounds), uses on average just 9.1 liters of fuel per 100 km (25.85 US mpg) and emits 212 g CO2 per km (341.18 g/mile). This efficiency is due in large part to a delivery-on-demand oil pump and a regenerative system that recovers energy as the car decelerates.

The 2.5-liter engine in the RS 3 Sportback will thrill passengers thanks to its tremendous pulling power and its voracious revving up to 6,800 rpm. The guttural roaring and growling, backed by the signature rhythm of the five-cylinder firing order make up the classic Audi soundtrack. A sound flap in the exhaust branch intensifies the sound even further. The flap is controlled via the standard Sport button, which also varies the engine response.

Powerful five-cylinder engines have a long legacy at Audi. In the 1980s, racing cars and production cars used them to edge out the competition. Even the first Audi RS model, the 1994 RS 2, had a five-cylinder engine. The 2.5-liter unit, already part of the TT RS specifications, now redefines the state of the art, having recently been named “International Engine of the Year” by a high-ranking jury of automotive journalists.

The 2.5 TFSI delivers 250 kW (340 hp) from a displacement of 2,480 cc: a specific power output of 100.8 kW (137.1 hp) per liter. The maximum torque of 450 Nm (331.90 lb-ft) is readily available at the low end of the rev range, around 1,600 rpm, and remains constant up to 5,300 revolutions. These general parameters yield excellent acceleration and elasticity values.

Just 49 centimeters (19.29 inches) in length, the five-cylinder unit is ultra-compact, tipping the scales at a mere 183 kilograms (403.45 pounds). The crankcase is made of vermicular-graphite cast iron, a high-strength yet lightweight material. Audi is the first car maker to use this material in a gasoline engine. Perfectly placed reinforcements further enhance the block’s loadability. The lightweight-design concept keeps the Audi RS 3 Sportback’s weight in check and pays off big in terms of axle‑load distribution and, ultimately, handling.

The large turbocharger generates up to 1.2 bar of boost pressure. The intercooler downstream achieves an efficiency rate of over 80 percent. Like all Audi gasoline turbos, the 2.5 TFSI combines turbocharging technology with FSI direct injection. The marriage of these two technologies facilitates a high compression ratio (10.0:1) along with a correspondingly high efficiency ratio. Flaps in the intake tract mix the air as it flows in. The two camshafts, each adjustable by 42 degrees of crankshaft rotation, also enhance the efficiency of the mixture formation.

Source: Audi press

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