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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.

New Audi Quattro concept coming to Frankfurt?

We first saw the Audi Quattro Concept at the 2010 Paris Motor Show, and since then we've been tugged this way and that by a series of rumors as to whether the car will be built or not, and whether such a car will live at the accessible or the exalted end of the cost spectrum. A report in Germany's Auto Zeitung from June restarted the fires of gossip with a report that a production version of the concept will appear at the Frankfurt Motor Show, and put it firmly in the exalted sphere.
Now, just a month from the show, Auto Bild has a similar report, sketching out an upmarket car but on a different platform. Back when we drove it, the Quattro concept was built on a spaceframe based on the RS5 platform and got its go from a 2.5-liter five-cylinder engine with 380 horsepower and 354 pound-feet of torque (the show car got 408 hp from a turbocharged five-cylinder). The June report from Auto Zeitung said this new reveal would be powered by a modified version of the twin-turbo 4.0-liter V8 from the RS7 that would put out something like 650 hp. Auto Bild, on the other hand, reports that the engine will be tuned to something like 600 hp and the new concept will ride on an "enhanced" version of the A6 platform.
Both reports agree that the car we'll see will preview Audi's new design language with "tauter, more angular lines." Lightweight and exotic materials will be used in efforts to reach a supposed target weight of 1,200 kilograms (2,640 pounds), down from a target of 2,900 pounds in earlier report. Auto Bild says that Audi still hasn't decided whether to make a production version, but if they are correct about the direction of the concept, any retail offering based on it isn't going to be cheap.

40+ cars that barely avoid the gas guzzler tax

The Gas Guzzler schedule, with mpg ratings and charges that haven't changed since 1991, lays out which fuel-swillers owe what to Uncle Sam.
I started thinking about the "Gas Guzzler Tax" - considerably less well known as The Energy Tax Act of 1978 - when I was driving Dodge's new Challenger SRT Hellcat last week. Unsurprisingly for a car that can burn 1.5 gallons of gas per minute at max tilt, theoretically able to empty a full tank of premium in about 13 minutes, the Hellcat will be subject to the Gas Guzzler Tax schedule when it goes on sale.