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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.

2016 Audi RS 7 Performance Quick Spin

Audi's roster of Sevens – the A7, S7, and RS 7 – gets a new and overachieving member with the new RS 7 Performance. The big story is that it ups the RS 7's 560 horsepower to 605. And while the advertised torque rating of 517 pound-feet doesn't change, Audi says the car will actually produce 553 lb-ft during moments of overboost. Hunkered-down with 21-inch wheels filling the wheel wells, the RS 7 Performance has a top speed of 190 miles per hour, and runs to 60 mph in 3.6 seconds – our informal stopwatch tests suggest that may even be conservative. We drove the RS 7 Performance in Florida, which included an eventful lap around Daytona International Speedway's road course, just prior to the Rolex 24 Hours at Daytona. More about that in a moment. Driving Notes The RS 7 Performance is pretty rough-riding at its softest, a problem only on bad pavement and roads with dips. It isn't punishing, but it never lets you forget this is a performance luxury car, in that order. The eight-speed Tiptronic automatic transmission is a sweetheart, never confused and always standing by to maximize the 4.0-liter, twin-turbocharged V8's muscle. It would have been nice to be able to dial in a little extra exhaust sound – what you can hear makes you want more. The RS sport seats, with optional Valcona leather and Alcantara inlays and steering wheel cover, are excellent. There's a reason why Audi is a template for automotive interior designers. Rear seat room is a little tight but tolerable. As for that lap at Daytona: We were only given one, so we went for it, and hit 164 mph on the back stretch before having to wade deep into the ABS for the bus stop turn. The engine was still pulling hard – we have little doubt the advertised 190 mph top speed is accurate. While the big ceramic brakes did their job, we weren't given a cool-down lap, and the combination of 4,500 pounds and 164 mph seemed to have set the front brakes on fire. No, really. It took a spritz of water to drown them out. We were told that it isn't unusual for ceramic brakes, the first time they hit 800 degrees, to burn out some impurities. Afterwards, the brakes worked fine, but we sure got a lot of attention from the IMSA Rolex crew on pit road. The RS 7 Performance is a viceless car, one we'd cheerfully drive for a very long time.

Audi recalls 850,000 A4 models globally for airbags that won't deploy

Audi has announced that it will be recalling 850,000 A4 sedans, wagons and Allroad models across the globe due to a software problem that could prevent the front airbags from deploying. All 850,000 vehicles were built after 2012.
Audi has already adjusted production of new A4s to eliminate the software glitch. Meanwhile, the German manufacturer was quick to emphasize that Takata did not manufacture the affected airbags.
According to Reuters, 250,000 of the affected A4s were built for the Chinese market, while another 150,000 were sold in Germany. Audi didn't provide a breakdown beyond those two countries, although it'd be a surprise if there weren't at least some affected airbags in the US market.