The new Audi A5 Coupé will launch in Germany with a choice of two TFSI and three TDI engines. They produce between 140 kW (190 hp) and 210 kW (286 hp). Compared with the previous model, their fuel consumption has been reduced by as much as 22 percent while power output has increased by up to 17 percent.
All engines satisfy the limits of the Euro 6 emissions standard. There is a 12-liter (3.2 US gal) tank for the AdBlue additive in addition to the standard tank. A 24-liter (6.3 US gal) tank is available as an option. The standard, updated start-stop system includes changes that further reduce fuel consumption. When the driver approaches a red light, it can already deactivate the engine at speeds below 7 km/h (4.3 mph) (with S tronic; with tiptronic: 3 km/h (1.9 mph)).
The new Audi S5 Coupé is in a league of its own. Its newly developed 3.0 TFSI engine combines sports car performance with a new level of efficiency. From its 2,995 cc of displacement, the turbocharged six-cylinder engine produces 260 kW (354 hp), which is 15 kW (21 hp) more than the engine in the previous model.
2.0 TFSI engines
Two versions of the 1,984 cc, 2.0 TFSI engine are available in the new Audi A5 Coupé. Technical highlights include the exhaust manifold integrated into the cylinder head, the rotating core module for the thermal management system, the Audi valvelift system (AVS) for the exhaust valves, the turbocharger’s electric waste gate and dual injection, in which indirect manifold injection supplements FSI direct injection.
The top version of the 2.0 TFSI produces 185 kW (252 hp). 370 Nm (272.9 lb-ft) of torque is available between 1,600 and 4,500 rpm. Performance is sporty: With quattro all-wheel drive, the Audi A5 Coupé sprints from 0 to 100 km/h (62.1 mph) in 5.8 seconds on its way to an electronically limited top speed of 250 km/h (155.3 mph). The unit consumes 5.9 liters of fuel per 100 kilometers (39,9 US mpg), which corresponds to 136 grams CO2 per kilometer (218,9 g/mi).
The second variant of the 2.0 TFSI puts out 140 kW (190 hp), with 320 Nm (236.0 lb-ft) of torque available between 1,450 and 4,200 rpm. Performance is extremely agile here, as well: 7.3 seconds from 0 to 100 km/h (62.1 mph) and a top speed of 240 km/h (149.1 mph) (with S tronic). The unit consumes 5.1 liters of fuel per 100 kilometers (46.1 US mpg), which corresponds to 117 grams CO2 per kilometer (188.3 g/mi).
Innovative combustion process
Behind these values is a new strategy: Audi is taking the successful downsizing of its engines a step further with rightsizing. The groundbreaking efficiency of the 2.0 TFSI with 140 kW (190 hp) is the result of an innovative combustion process. Rather than a handicap, the relatively large displacement is a prerequisite here. Customers of the new Audi A5 Coupé enjoy the advantages of a small-displacement engine when driving at moderate speeds, but without having to compromise when it comes to sporty driving.
The new combustion process with a shortened compression stroke and a long power stroke as well as an increased compression ratio has been specially designed for part load operation, by far the most common operating mode. The intake valves close much sooner than usual. In combination with increased pressure in the intake manifold, this reduces throttle losses during intake.
The shortened compression stroke made it possible to increase the compression ratio from 9.6 to 11.7:1. During the compression stroke, the engine therefore only has to compress the same amount of gas as a 1.4 TFSI. During the power stroke, in which the engine takes full advantage of its two liters of displacement, it benefits once again from the high compression ratio. The resultant higher pressure during combustion further increases efficiency.
So that the charge sufficiently swirls despite the short inlet time, the combustion chambers, piston recesses and inlet ducts as well as the turbocharging of the new 2.0 TFSI are specially tuned to the new combustion method. At higher loads, the Audi valvelift system delays opening of the intake valves to achieve a higher fill and thus good power and torque development. Injection pressure has been increased to 250 bar.
The 1,968 cc, four-cylinder TDI in the new Audi A5 Coupé produces 140 kW (190 hp). Peak torque of 400 Nm (295.0 lb-ft) is available between 1,750 and 3,000 rpm. The powerful four-cylinder diesel offers superior performance and maximum efficiency. With quattro all-wheel drive and the seven-speed S tronic, from 0 to 100 km/h (62.1 mph) takes 7.2 seconds. Top speed is 235 km/h (146.0 mph). In combination with the seven-speed S tronic and front-wheel drive, the 2.0 TDI consumes just 4.4 liters of fuel per 100 kilometers (53.5 US mpg) according to the NEDC standard, a CO2 equivalent of 114 grams per kilometer (183.5 g/mi).
The 2.0 TDI is packed with clever technical solutions: separate coolant circuits, two balance shafts in the crankcase, a cylinder pressure sensor, greatly reduced internal friction and a common rail injection system that keeps the fuel at a maximum pressure of 2,000 bar. High and low-pressure exhaust gas recirculation and sophisticated exhaust gas treatment including an SCR system (SCR: selective catalytic reduction) provide for low emissions.
Audi also offers the 2.0 TDI in an ultra version, whose presence is indicated by a badge on the rear end. ultra stands for the most efficient models of a model line. Modifications to the transmission ratio, the body and the chassis as well as the use of low-rolling-resistance tires help to further reduce consumption. The new Audi A5 Coupé 2.0 TDI ultra with S tronic consumes a best-in-class 4.0 liters of fuel per 100 kilometers (58.8 US mpg) in the NEDC, corresponding to 105 grams CO2 per kilometer (169.0 g/mi).
Supreme power, cultivated refinement and exemplary efficiency – these agreeable characteristics are common to both six-cylinder TDI engines used in the new Audi A5 Coupé. The 3.0 TDI has a displacement of 2,967 cc and is available with a power output of either 160 kW (218 hp) or 210 kW (286 hp).
3.0 TDI with 160 kW (218 hp)
The first variant of the 3.0 TDI produces 160 kW (218 hp). Its torque of 400 Nm (295.0 lb‑ft) is available between 1,250 and 3,750 rpm. In the NEDC, the new Audi A5 Coupé consumes just 4.6 liters of fuel (51.1 US mpg), corresponding to CO2 emissions of 119 grams per kilometer (191.5 g/mi).
The 218 hp TDI, which only weighs around 190 kilograms (418.9 lb), combines numerous high-tech solutions: a very complex thermal management system, new friction-optimized cylinder heads and an electrically adjustable turbocharger that builds up as much as 2.6 bar of charge pressure. The exhaust treatment system is located directly at the back side of the engine; its NOx catalytic converter (combination of a NOx storage-type converter and an oxidizing catalytic converter) works in conjunction with a diesel particulate filter with an SCR coating.
3.0 TDI with 210 kW (286 hp)
The new top TDI increases power output by an additional 30 kW (40 hp) for a total of 210 kW (286 hp) and offers 620 Nm (457.3 lb-ft) of torque between 1,500 and 3,000 rpm. As this engine is currently still in type approval, there are no consumption values available yet.
The Audi developers have extensively updated numerous aspects of the new 3.0 TDI with 210 kW (286 hp). The objectives were: optimize combustion chamber filling, charge exchange and thermal management in order to increase power output while simultaneously further reducing consumption. Close-coupled catalytic converters treat the exhaust gas effectively.
One important component in the updated three-liter TDI is the Audi valvelift system (AVS), which adjusts the stroke of the exhaust valves in two stages. The AVS initiates a second, small opening stroke after the valves close allowing a certain amount of exhaust gas to reenter the combustion chamber. This back suction increases the exhaust gas temperature and at the same time the efficiency of the exhaust gas treatment: This brings the exhaust gas up to temperature quickly following a cold start and at low load so that both emissions control systems mounted close to the engine are activated very early.
The first component is a large NOx catalytic converter. It stores the nitrogen oxides until it is full. Cleaning is by means of mixture enrichment in the engine. In order to increase the efficiency, the NOC is only active at low exhaust gas temperatures – after starting. In all other situations, NOx conversion is handled by the second component, the diesel particulate filter with SCR coating.
A newly developed, 20-percent lighter turbocharger with variable turbine geometry (VTG) and maximum charging pressure of 3.3 bar is working in the top diesel engine. The developers paid attention to an optimized inflow, through which the engine responds very spontaneously to the accelerator. The new external low-pressure exhaust gas recirculation increases the efficiency of the turbocharger. Particularly at intermediate and high load, it enables the full exhaust gas mass flow to drive the turbine.
The thermal management system of the powerful 3.0 TDI supplies coolant to the independent cooling circuits of the cylinder crankcase and the cylinder heads in such a way that the engine oil quickly comes up to operating temperature following a cold start. The cylinder heads feature two-piece water jackets, and the oil cooler is included in or excluded from the coolant flow path as needed. The cylinder crankcase, the crankshaft and the cylinder heads are extremely light. Each of these technologies makes the engine even more efficient.
Fuel consumption of the models named above:
Audi A5 Coupé
Combined fuel consumption in l/100 km: 6.3 – 4.0** (37.3 – 58.8 US mpg);
Combined CO2 emissions in g/km: 144 – 105** (231.7 – 169.0 g/mi)
Audi S5 Coupé
Combined fuel consumption in l/100 km: 7.4 – 7.3** (31.8 – 32.2 US mpg);
Combined CO2 emissions in g/km: 170 – 166** (273.6 – 267.2 g/mi)
Audi RS 5 Coupé
Combined fuel consumption in l/100 km: 10.5 (22.4 US mpg);
Combined CO2 emissions in g/km: 246 (395.9 g/mi)
Audi RS 5 Cabriolet
Combined fuel consumption in l/100 km: 10.7 (22.0 US mpg);
Combined CO2 emissions in g/km: 249 (400.7 g/mi)
Audi A4 2.0 TFSI ultra (140 kW)
Combined fuel consumption in l/100 km: 6.1 – 4.8** (38.6 – 49.0 US mpg);
Combined CO2 emissions in g/km: 139 – 109** (223.7 – 175.4 g/mi)
**Fuel consumption and CO2 emissions data
are dependent on the choice of wheels and tyres as well as
on the combination of engine and gearbox.