For the first time ever, the Audi S5 has a V6 diesel under the hood. The 3.0 TDI engine in the S5 Coupé TDI and the S5 Sportback TDI with combined fuel consumption for both models in 6,2 l/100 km, produces 255 kW (347 hp) and delivers up to 700 Nm of torque to the crankshaft. An electric powered compressor provides for strong off-the-line performance; a mild hybrid system enhances efficiency. This combination of power, torque and efficiency makes the S5 unique in its segment.
The 3.0 TDI in the S5 models is the most powerful version in the Audi V6 diesel engine lineup. Its combination of performance and efficiency sets it apart in this segment. Output is 255 kW (347 hp), and 700 Nm of torque is available between 2,500 and 3,100 rpm. Despite significantly greater performance, NEDC consumption derived from the WLTP values for the S5 Coupé TDI and the S5 Sportback TDI is just 6.2 liters of diesel per 100 kilometers a CO2 equivalent of 161 grams per kilometer. The new S models consume on average 19 percent less fuel than their predecessors with gasoline engines despite producing significantly more torque.
The six-cylinder diesel engine accelerates the S5 Coupé in 4.8 seconds and the S5 Sportback in 4.9 seconds from 0 to 100 km/h. The electronically limited top speed is 250 km/h (155.3 mph). With these characteristics, the V6 diesel engine is the ideal power plant for agility, spontaneity, low fuel consumption and long range. It also has a sporty sound and is very smooth.
The engine in the S TDI models features the electric powered compressor (EPC) and mild hybrid technology (MHEV). Both systems are embedded in the standard 48-volt main electrical system. For the first time in the S5 TDI, a powerful 48–volt belt alternator starter is the heart of the mild hybrid system with maximum recuperation power of up to 8 kW. A DC/DC converter steps this voltage down for components in the 12–volt electrical system. A compact, air-cooled lithium-ion battery with a capacity of 0.5 kWh installed under the luggage compartment floor serves as the energy center.
The Audi S5 models with TDI engines will be available on the European market from May 2019. The starting price in Germany for the S5 Coupé TDI and S5 Sportback TDI is 65,300 euros. This includes popular options from the Audi A5 worth around 7,000 euros as standard equipment. These include LED headlights with dynamic turn signals, S sport suspension with tautly tuned suspension and damping, 18-inch wheels, power-adjustable front sport seats with Alcantara leather, embossed S logo and seat heating, and sportily contoured bumpers.