Audi has released new details about their RS5 TDI concept.

Designed to celebrate the 25th anniversary of the TDI engine, the concept has been equipped with a twin-turbo 3.0-liter V6 TDI engine that has a "supplemental electric turbocharger" that helps to provide "staggering power" off the line. While there's been some debate over whether the turbocharger is actually a supercharger, Audi says "an electric motor replaces the turbine wheel and accelerates the compressor wheel to over 70,000 rpm in a few hundredths of a second. The exhaust turbochargers also provide as much as 2.4 bar of relative boost pressure."

The electric turbocharger is powered by a compact lithium-ion battery and uses a separate 48 volt electrical system that is connected to the conventional 12-volt electrical system via a DC/DC converter.

Thanks to all these modifications, the engine develops 385 PS (283 kW) and 750 Nm (553 lb-ft) of torque from just 1,250 to 2,000 rpm. This enables the concept to run from 0-100 km/h in four seconds, 0-200 km/h (0-124.3 mph) in less than 16 seconds and on to a top speed of 280 km/h (174 mph). Even more impressive is the fuel economy which is less than 5.3 L/100km (44.3 mpg US / 53.2 mpg UK).

According to Audi's head of technical development, Dr. Ulrich Hackenberg, "Our latest innovation is the electric turbocharger, which further improves not just sprint times and pulling power, but also efficiency. This technology illustrates the possibilities harbored by 48-volt electrical systems, which we are currently developing for use in production vehicles.”

Audi declined to confirm the engine will go into production but previous reports have suggested it will be offered on the 2015 / 2016 Q7.

Gallery: Audi RS5 TDI concept gets detailed, company highlights the e-turbo

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