What's the news?
Audi has revealed details of a new technology prototype, the RS 5 TDI coupé, bringing its electric turbocharger concept closer to production, with big boosts in both performance and efficiency claimed.
The RS 5 TDI concept features a 3.0-litre V6 bi-turbo diesel engine with an electric turbocharger replacing the smaller turbo for quicker acceleration. It can cover the 0-62mph sprint in just four seconds, thanks to maximum power of 385hp and 750Nm of torque.
Prof. Dr. Ulrich Hackenberg, Board Member for Technical Development, said: "25 years ago, Audi launched the first TDI on the market, writing the first chapter of an enduring success story. 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 48-volt electrical system is what powers the electric turbo and it does so via a small lithium-ion battery that draws its power from the car's recuperation systems such as regenerative braking. When deployed, the compressor in the turbo spins to over 70,000rpm within a few hundredths of a second, giving the RS 5 TDI its impressive acceleration. The new set up also allows for the fitment of a larger, second stage mechanical turbo, which produces as much as 2.4 bar of boost at maximum power. This helps achieve a top speed of 174mph.
Anything else?
The RS 5 TDI is not just quick, but also efficient - more so than any other to wear the RS badge so far. The average fuel economy is nearly 55mpg with emissions below the 140g/km mark.
Paul Healy - 25 Jun 2014