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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 rumored to buy Alfa Romeo, officials deny it

For more than two years, Volkswagen has been making public statements about its willingness to buy Alfa Romeo and quadruple the Italian brand's sales, and for just as long, Fiat CEO Sergio Marchionne has replied with some version of "Mr. Piëch, drop it." According to a report in Ward's Auto, all that jousting might be over: it claims that sources close to both Marchionne and Audi CEO Rupert Stadler admit that the two are in talks for Audi to buy not just Alfa Romeo, but a production plant in Italy. In fact, a final deal could possibly include partsmaker Magnetti Marelli.
Against that backdrop, a report by German news weekly Stern quotes a Fiat spokesmen as saying it doesn't comment on rumors and an Audi rep has said flatly that "There is no substance in the news." If a sale is being arranged, the timing would seem to point to how eager Fiat is to raise cash to complete its major initiatives. Even though Alfa Romeo continues to delay its return to the US, it just showed off the production version of the 4C at the Geneva Motor Show (shown above) and said that preferred Fiat dealerships here would get them. Then there's Alfa's recently concluded deal with Mazda to develop a roadster based on the next generation MX-5 Miata - a deal that would seem to help both the Italian and Japanese brands.
The monetary issues are troublesome, though. Fiat is taking a beating in the European market and its weak-kneed balance sheet is delaying gotta-have-it products like the Jeep Cherokee. Fiat has been talking to banks about getting money to buy the rest of Chrysler and those financial institutions have also raised issues about debt and cash reserves, and the nasty game of chess Fiat is playing with the United Auto Workers (and now the court system about the portion of Chrysler it doesn't own) could end up blowing another hole in Marchionne's plans. It is possible that this could finally have convinced Fiat to at least see how serious Audi's parent company, Volkswagen, is about buying Alfa Romeo. Or it could be just another rumor.

Audi spotted testing new S4 at the Nurburgring

Where there's smoke, there's fire. Only in this case, the smoke is the upcoming new Audi A4, and the fire is the S4 spotted undergoing testing in this latest batch of spy shots. Snapped in both sedan and Avant wagon forms while undergoing testing on and around the Nurburgring – where else? – the next-generation Audi S4 will of course be based on the new A4 that's anticipated to debut in Frankfurt this September. That means MLB Evo architecture and styling that takes a page out of the new TT's playbook. But in S4 trim, it'll be altogether more performance oriented. Expect an even more powerful version of the outgoing model's 3.0-liter supercharged V6, pumping out a good 340-350 horsepower to all four of its driven wheels. That power will help it keep pace with the new Mercedes C450 AMG Sport. It won't have to take on the new C63 AMG directly, though, as that'll be the job of the next RS4 that will slot above it. But since that model may never make it to US showrooms, this will stand as the flagship of the new A4 family as far as the American market is concerned. Related Video: