Audi has unveiled its new-look S4 range with a more streamlined exterior and contemporary feel.
The high performance S4 variants get TDI power for the first time in the model’s history, and benefit from the same independent electric compressor technology that brought the SQ7 so much critical acclaim.
Ordering is expected to open in late June with the first deliveries in September.
The S4 TDI and S4 TDI Avant are now equipped with a V6 diesel engine. The 3.0 TDI combines substantial torque of 700Nm, smooth running and long range capability and provides a power output of up to 347 PS. It powers the S4 TDI Saloon from zero to 62mph in 4.8 seconds on the way to an electronically governed top speed of 155mph. This combination of power, torque and efficiency makes the Audi S4 TDI unique in the segment.
The V6 TDI works with an electric compressor which facilitates near instantaneous throttle response and virtually seamless power build-up under acceleration by eliminating turbo lag. The compressor is integrated into a new 48-volt main electrical system, which also incorporates the mild-hybrid system. This provides even more efficiency potential than the MHEV system in the 12-volt electrical system on the A4 models. The 12-volt subsidiary electrical system is connected to the 48-volt main electrical system via a powerful DC/DC converter. For the first time a powerful 48-volt belt alternator starter is being used in the S4 TDI as the heart of the mild-hybrid system with a maximum recuperation power of up to 8 kW when braking.
A compact, air-cooled lithium-ion battery with a capacity of 0.5 kWh, which is located under the luggage compartment floor, acts as an energy management centre. The mild-hybrid system on the S models has the potential to reduce customer fuel consumption by up to 0.4 litres per 100 kilometres.
An eight-speed tiptronic and quattro permanent all-wheel drive complement the sophisticated powertrain, and S-specific sport suspension delivering outstanding composure and control is of course standard. Inside and out, a host of design details point to the unique position of the S models – from the quad exhaust tailpipes to the S mode in the display of the standard Audi virtual cockpit.