Rightsizing is essential in the new A7 Sportback, for which Audi has created a new engine lineup. There will initially be five turbocharged direct-injection units: two TFSI and three TDI versions. Displacement ranges from 2.0 to 3.0 liters and power output from 160 kW (218 hp) to 245 kW (333 hp). Two versions of the top-of-the-line 4.0 TFSI are available. In the Audi S7 Sportback, this engine delivers 331 kW (450 hp); in the Audi RS 7 Sportback, 412 kW (560 hp). Both versions feature innovative cylinder on demand technology (COD). These engines not only have grown more powerful; their fuel consumption has dropped by as much as 16 percent as well. All engines comply with the Euro 6 emission standard. Further engines, including a second four-cylinder TFSI, will be unveiled after the market launch.
One standard feature in the new Audi A7 Sportback is the overhauled start-stop system which switches off the engine as soon as the driver brakes at speeds below 7 km/h (4.3 mph). The start-stop system is inactive whenever the transmission is in S mode or in the manual shift gate.
High-tech and compact: the 2.0 TFSI
The new entry-level engine is the 2.0 TFSI – the latest generation of the same engine that won the International Engine of the Year Award in its class five times in succession from 2005 through 2009. This four-cylinder unit delivers 185 kW (252 hp) of power from a displacement of 1,984 cc (bore x stroke 82.5 x 92.8 millimeters [3.2 x 3.7 in]). It also supplies 370 Nm (272.9 lb-ft) of torque, which remains constant from 1,600 to 4,700 rpm. The 2.0 TFSI propels the new A7 Sportback with front-wheel drive from zero to 100 km/h (62.1 mph) in 6.9 seconds and on up to an electronically limited top speed of 250 km/h (155.3 mph).
NEDC fuel consumption (provisional figures) amounts to just 6.2 liters of fuel per 100 km (37.9 US mpg), corresponding to CO2 emissions of 144 grams per kilometer (231.7 g/mi). quattro permanent all-wheel drive will be made available shortly after market launch.
The major innovation in the 2.0 TFSI is the addition of indirect injection, which largely replaces direct gasoline injection during partial-load operation. This innovation supplies fuel at the end of the intake manifold to the tumble flaps, where the fuel is intensively swirled with air. The improved mixture formation this results in boosts fuel economy and reduces particulate emissions. FSI injection, which develops pressures up to 200 bar, is used when starting as well as at higher loads and engine speeds.
The turbocharger is pivotal to the four-cylinder unit’s agile personality. Its main features include a quick and precise electric wastegate adjuster and a turbine wheel made of an alloy that can withstand very high exhaust-gas temperatures. Charging efficiency is thus high in the combustion chambers. Scavenging losses are kept to a minimum. The intake and exhaust camshafts are adjustable. The Audi valvelift system (AVS) switches, as needed, between two settings for valve lift on the exhaust side.
The exhaust manifold of the 2.0 TFSI is integrated within the cylinder head; it quickly brings the coolant to temperature after a cold start. At full load the cooling jacket reduces the temperature of the exhaust gas. This removes the need for enrichment of the fuel-air mixture to cool it, in turn significantly improving fuel efficiency.
Thanks to these new technologies, the 2.0 TFSI weighs hardly more than 130 kilograms (286.6 lb). This is due in part to a crankcase made of cast gray iron; its walls are just three millimeters thick.
Significantly advanced: the 3.0 TFSI
The overhauled 3.0 TFSI in the new Audi A7 Sportback delivers 245 kW (333 hp) – 17 kW (23 hp) more than its predecessor. Its peak torque of 440 Nm (324.5 lb-ft) is available between 2,900 and 5,300 rpm. The V6 supplies a displacement of 2,995 cc (bore x stroke 84.5 x 89.0 millimeters [3.3 x 3.5 in]); a compressor compresses the intake air. Positioned in the cylinder banks’ 90-degree V and driven by the crankshaft via a belt, a mechanical turbocharger compresses the intake air as high as 0.8 bar. Two intercoolers integrated within the crankcase then cool down the hot air further so that even more oxygen enters the combustion chambers.
Short gas-travel paths, lightning-fast response times, powerful acceleration and resonant sound: this three-liter V6 propels the new Audi A7 Sportback, which has quattro drive as standard, from 0 to 100 km/h (0 to 62.1 mph) in just 5.3 seconds. Its top speed is limited to 250 km/h (155.3 mph). It consumes on average 7.6 liters per 100 kilometers (30.9 US mpg), corresponding to 176 grams of CO2 per kilometer (283.2 g/mi).
This improved fuel efficiency can be traced back to significant input on the part of the development engineers. A new electromagnetic clutch deactivates the compressor at loads up to 250 Nm (184.4 lb-ft) and speeds up to 3,000 rpm. Dual injection, intake and exhaust camshafts that can be adjusted by 50 and 40 degrees of crank angle respectively, and also friction-reducing measures regarding the chain drive, the piston rings and the camshafts constitute classic efficiency technologies by Audi. The oil cooler, water pump, cylinder liners and crankshaft have also been modified. Compression has increased to 10.8:1.
TDI engines: three-liter V6 in three power-output classes
Among the diesel engines, the 3.0 TDI under the hood of the new A7 Sportback satisfies all requirements. Audi offers the V6, which also has a 90-degree cylinder bank angle and a displacement of 2,967 cc (bore x stroke 83.0 x 91.4 millimeters [3.3 x 3.6 in]), as an extensively modified single-turbo configuration in two power-output classes and as a biturbo unit. The single-turbo TDI weighs less than 192 kilograms (423.3 lb). Its crankcase made of high-strength vermicular-graphite cast iron is even lighter than before.
Audi’s new V6 TDI boasts high-end solutions in all fields of technology. The pistons are cooled by means of oil in a cast-in duct. Their rings and pins have been optimized to minimize friction. The crankcase and the all-new cylinder heads have separate coolant circuits, and are part of the optimized innovative thermal management system. The cylinder heads’ cooling jackets are divided into an upper section and a lower section to reduce pressure losses. The turbocharger and the exhaust-gas treatment system have likewise been overhauled. The oil pump is fully variable. Particularly lightweight hollow shafts serve as camshafts. The common rail injection system develops a system pressure of 2,000 bar. The compression ratio is 16.0:1.
Thanks to an emissions-control unit compliant with the Euro 6 emissions standard, all versions of the 3.0 TDI bear the “clean diesel” designation. Their components are integrated within the engine package due to the proximity of the exhaust-gas treatment system to the engine. A larger catalytic converter with oxygen sensor is downstream of the turbocharger’s turbine outlet. Immediately downstream lies a diesel particulate filter. The inner lining of its filters has a coating that removes nitrogen oxides from exhaust emissions as per selective catalytic reduction (SCR). A metering module injects AdBlue, an additive.
The reconfiguration of emissions-control components necessitated, among other things, modifications to the chain drive, exhaust-gas turbocharger and cylinder heads. The oil/vacuum pump has been fitted with a drive of its own. Intermediate wheels with gearwheel stages have replaced the camshafts’ large sprocket wheels.
122 g/km (196.3 g/mile): the Audi A7 Sportback 3.0 TDI ultra
An astoundingly efficient configuration, the 3.0 TDI ultra with front-wheel drive delivers 160 kW (218 hp) and develops 400 Nm (295.0 lb-ft) of torque between 1,250 and 3,750 rpm. Other key figures are every bit as impressive. This engine propels the vehicle from 0 to 100 km/h (0 to 62.1 mph) in 7.3 seconds and on up to a top speed of 239 km/h (148.5 mph). It needs just 4.7 liters of fuel per 100 km (50.0 US mpg), corresponding to 122 grams of CO2 per km (196.3 g/mi). This new best figure means this model version has earned the “ultra” designation.
When paired with quattro drive, this engine propels the new Audi A7 Sportback from zero to 100 km/h (62.1 mph) in 6.8 seconds. It, too, has a top speed of 239 km/h (148.5 mph). However, it consumes just 5.2 liters of fuel per 100 km (45.2 US mpg) on average – a CO2 equivalent of 136 grams per km (212.4 g/mi).
A more robust version of the new 3.0 TDI boasts an impressive 200 kW (272 hp) and 580 Nm (427.8 lb-ft) of torque between 1,250 and 3,250 rpm. quattro drive is standard with this version. Acceleration from 0 to 100 km/h (62.1 mph) takes 5.7 seconds and top speed is limited to 250 km/h (155.3 mph). Fuel consumption is just 5.2 liters of fuel per 100 km (45.2 US mpg) on average, which corresponds to 136 grams of CO2 per km (218.9 g/mi).
Topping the diesel engine lineup is the new 3.0 TDI with biturbo technology and 235 kW (320 hp). It accelerates the five-door coupe from zero to 100 km/h (62.1 mph) in 5.2 seconds on the way to an electronically governed top speed of 250 km/h (155.3 mph). Average fuel consumption is just 6.1 liters per 100 km (38.6 US mpg), which equates to 162 g CO2 per km (260.7 g/mi). The biturbo TDI is always paired with quattro permanent all-wheel drive.
A sound actuator in the exhaust system gives this diesel engine a rich, resonant sound reminiscent of an eight-cylinder unit. A valve connects the two in-series turbochargers. At low revs it is closed. The small charger with its variable turbine geometry does most of the work, and the large charger is responsible for the pre-compression. From about 2,500 rpm, the valve starts to open and the small charger increasingly transfers the major share of work to its counterpart. Between 3,500 and 4,000 rpm, the valve opens completely, and only the large charger still operates.
The equipment and data specified in this document refer to the model range offered in Germany. Subject to change without notice; errors and omissions excepted.