car-engineer english version car-engineer version française

The Audi RS 5 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.”

Audi RS5 TDI concept

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 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 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 four seconds. The 200 km/h (124.3 mph) mark is reached in 16 seconds, and top speed is 280 km/h (174.0 mph). The average fuel consumption is 5.3 liters of diesel per 100 kilometers (less than 140 grams CO2 per kilometer).

Audi RS5 TDI concept

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.

Source: Audi
Romain’s opinion:
It is too bad that this vehicle is just a concept. The amount of torque is huge and I guess that the performances on a racetrack are comparable to the one of a gasoline supercar. After seeing Renault Sport communicating about a record on Nürburgring for its Mégane R.S., why Audi isn’t trying to do the same with its TDI technology for production cars?

Leave a Reply