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Audi says new 48 volt micro-hybrid system improves fuel economy, paves way for electrification

Most cars use a 12-volt system to power their electrical components. But, with more and more electric bits and bobs being added to new vehicles, a dozen volts is looking a bit weak these days. In fact, Audi says that standard 12-volt systems are being stretched "to their very limits." Enter 48 volts. If used in a car that gets 40 mpg, that would translate to around 43.5 mpg. Audi is testing a supplemental 48-volt electric system in two prototype vehicles – modified mild-hybrid versions of the A6 TDI and the RS 5 TDI – in order to add in more electric technology (an electric compressor, for example, to improve acceleration) and "convenience systems for dynamic chassis control." Audi says it has more applications in the pipeline, but the overall gist is that the German automaker sees 48 volts as an "important building block in electrification strategy." As you can see in the picture above (click to enlarge), the RS 5 TDI concept uses a li-ion battery installed in the back of the car and an alternator to provide 48 volts when the engine is off. Audi says that the 48-volt system can save up to 0.4 liters of fuel per 100 kilometers. To put that into US numbers, if used in a car that gets 40 miles per gallon today, that would translate into a bump up to around 43.5 mpg. The Advanced Lead Acid Battery Consortium (ALABC) is also working on a 48-volt system to improve fuel economy and we've got a deep dive of Audi's electric turbocharger here. Even more powerful and efficient – the new 48-volt technology from Audi Important building block in electrification strategy More voltage and more power for new technologies Scalable platform concept suitable for wide-ranging uses Ingolstadt, August 25, 2014 – Audi is to upgrade part of its vehicle electrical system from twelve to 48 volts. The move represents another technical building block for facilitating the integration of new automotive technologies while increasing the power and efficiency of its cars. "We are using the full bandwidth of electrification in our drive principles strategy. Running part of the vehicle electrical system at 48 volts plays a central role in this," commented Prof. Dr. Ulrich Hackenberg, Member of the Board of Management for Technical Development at Audi. "It enables us to make more energy available.

Audi to launch 600-hp RS6 Avant Plus?

Much to the dismay of many - but apparently not enough - there's a whole category of power wagons available overseas that we just can't get our hands on. While the Mercedes-Benz E63 AMG Estate and Cadillac CTS-V Sport Wagon are both available Stateside, the recently revised Mercedes-Benz CLS63 AMG Shooting Brake, the Jaguar XFR-S Sportbrake we recently drove at the Nürburgring and the Audi RS6 Avant remain out of reach for American buyers. They all stand on more-or-less equal footing, with forced-induction V8s producing around 550 horsepower. But Audi is apparently taking things over and above with a new RS6 Plus.
Revealed ahead of schedule on a British dealer's website (which leaked details accompanied by a stock photo of the existing model), the RS6 Avant Plus will apparently keep the same 4.0-liter twin-turbo V8, but upgrade from 560 hp to a nice, round 600 to put it ahead of the competition and in league with supercars. Considering that the existing RS6 Avant is already capable of cracking the four-second barrier to 60 and tops out at over 190 miles per hour, we're sure the Plus version will positively annihilate the Autobahn, all while bringing your whole family along for the ride.
Unfortunately it doesn't look any more likely that Quattro GmbH's latest Plus model will make the transatlantic journey to American showrooms, but we can hope that maybe Audi will perform similar modifications on the RS7 Sportback we do get here.

Autoblog Podcast #344

Doug DeMuro from Plays With Cars, Infiniti Q50, Subaru BRZ STI, Porsche Macan
Episode #344 of the Autoblog podcast is here, and this week, Dan Roth and Executive Editor Chris Paukert are joined by Doug DeMuro, author of Plays With Cars and prolific internet autowriting presence. Topics include the latest spy shots of the Porsche Macan, the 2014 Infiniti Q50, and the teaser images we've recently seen of a Subaru BRZ wearing STI badges. As always, we start with what's in the garage and finish up with some of your questions. For those of you who hung with us live on our UStream channel, thanks for taking the time. You can follow along after the jump with our Q&A. Thanks for listening!
Autoblog Podcast #344: