Audi RS5 TDI Concept gets official, reveals its V6 TDI with electric charger

Article by Andrew Christian, on June 19, 2014

Audi released the official details and specs of its latest concept, the RS5 TDI. As we previously told you, the RS5 TDI Concept is powered by a 3.0-liter V6 biturbo diesel engine that generates 385 hp (283 kW) and 750 Nm (5523 lb-ft) of torque from 1,250 to 2,000 rpm.

What’s more interesting is that the engine also features an electric turbocharger that provides staggering power when starting off. An electric motor was used to replace the turbine wheel and accelerate the compressor wheel to over 70,000 rpm in just a few hundredths of a second.

In addition, the exhaust turbochargers also provide as much as 2.4 bar of relative boost pressure. The engine pushes the RS5 TDI Concept from 0 to 100 km/h (62 mph) in 4.0 seconds, to 200 km/h (124 mph) in less than 16 seconds, while top speed is limited at 280 km/h (174 mph).

Despite these impressive performances, fuel consumption is just 5.3 l/100 km (44.4 US mpg), while CO2 emissions are less than 140 g/km. According to Audi, recuperation is the primary source of the drive energy for the electric turbocharger.

In order to transmit this energy, the RS5 TDI Concept uses a separate 48-volt electrical system that is connected to the conventional 12-volt electrical system via a DC/DC converter. As expected, the energy is stored in a compact lithium-ion battery.

Press Release

Audi RS5 TDI Concept

The RS 5 TDI concept technology study is powered by an enhanced-output V6 3.0 TDI biturbo boosted by an electrically driven turbocharger. This new development makes the diesel engine sportier and more efficient.

“25 years ago, Audi launched the first TDI on the market, writing the first chapter of an enduring success story,” says Prof. Dr. Ulrich Hackenberg, Board Member for Technical Development. “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.”

The V6 biturbo in the Audi RS 5 TDI concept produces 283 kW (385 hp); from 1,250 to 2,000 rpm it transfers 750 Nm (553.2 lb-ft) of torque to the crankshaft. The red-line is at 5,500 rpm. The supplemental electric turbocharger provides for staggering power when starting off. 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.

This combination enables the Audi RS 5 TDI concept to sprint from 0 to 100 km/h (62.1 mph) in just four seconds. The 200 km/h (124.3 mph) mark is reached in less than 16 seconds, and top speed is 280 km/h (174.0 mph). The average fuel consumption of less than 5.3 liters of diesel per 100 kilometers (less than 140 grams CO2 per kilometer) (44.4 US mpg/225.3 g/mi) documents the outstanding efficiency.

Recuperation is the primary source of the drive energy for the electric turbocharger. To transmit this energy, the RS 5 TDI concept uses a separate 48-volt electrical system that is connected to the conventional 12-volt electrical system via a DC/DC converter. The energy is stored in a compact lithium-ion battery. The advantage of 48-volt electrical systems is that they enable the transmission of larger amounts of energy. This makes them an important milestone in the Audi electrification strategy.

Topics: audi, audi rs5, tdi, concept

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