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Audi testing long-tail version of R18 e-tron quattro for Le Mans

Race teams are always looking for ways to shave hundredths of seconds of their lap times. Case in point: Audi is making some slight changes to its prototype racecar to make it ever so much more slippery as it cuts through the air.
Debuting at the second round of the FIA World Endurance Championship at Spa on May 4, Audi will be testing a long-tail version of its R18 E-tron Quattro racecar. As its name suggests, the long-tail car gets a lengthened rear section with the goal of improving aerodynamics. The long-tail will be run alongside the standard version of the racecar as a testbed for possible changes that might be in store, heading into the 24 Hours of Le Mans.
Audi did not say how many inches were added to the racecar, but as you can see in the image above, "long-tail" definitely doesn't take on the same meaning of classic long-tail cars of the past such as the Porsche 917. More information about the car, Audi's team and even some info about the track itself can be found below.

Audi creates new diesel fuel from carbon dioxide and water

What if you could power cars of the future with pollution created by the cars of the past? That's what German automaker Audi is hoping to achieve by creating a new synthetic fuel using renewable energy to turn water and carbon dioxide gas into a new kind of fuel they call "e-diesel." The new diesel is being produced at Audi's pilot plant Sunfire in Dresden, Germany. Only a few gallons were created, which the German Federal Minister of Education and Research Johanna Wanka put into her Audi A8 to prove the fuel's bonafides. The base fuel is known as "blue crude" and begins from a green source. Audi uses electricity from wind, water or solar power sources to separate hydrogen from oxygen in water. The hydrogen is then mixed with carbon dioxide which has been converted in carbon oxide. The blue crude is then further refined to create the e-diesel. The carbon dioxide is currently supplied by a biogas facilities, but some of that CO2 was captured from the air. "The engine runs quieter and fewer pollutants are being created," says Sunfire CTO Christian von Olshausen. The fuel can be combined with conventional diesel fuel, as biodiesel fuels already and would be competitively priced against regular diesel, according to Gizmag. Sunfire can produce about 42 gallons of e-diesel a day. That seems like barely a drop in the bucket in terms of Europe's energy use, but Audi is ready to commercialize the technology with plans to expand production with a bigger facility in the future.

Audi spotted running R8 E-Tron at the 'Ring

An electric version of the original Audi R8 may never have come to fruition – at least not in a form you could actually buy. But with the introduction of the all-new, second-generation model, Audi is getting serious about the prospect of producing the R8 E-Tron. And if you don't believe it, just look at these latest spy shots. Spotted testing at no less punishing a location than the Nurburgring is the upcoming new 2016 Audi R8 E-Tron. It looks just like the one we saw in Geneva earlier this year, painted in that same shade of electric blue, which we think suits the car rather well. It even has that orange strip of lighting around the side intakes, which drives the point of its electrification home in a rather stylish way, too. This prototype is wearing different wheels, and looks like it has some testing equipment mounted inside. Otherwise, this is pretty much what we can expect to see when Audi begins selling its electric supercar. We're sure there are more than a few eagerly awaiting customers who want to get their hands on an EV different from the Teslas or Nissan Leafs every other tree-hugger in the neighborhood has plugged in to their garages. To that end, expect the order books to open sometime later this year or maybe early into the next. Then the dream of an electric coupe with 456 horsepower and 679 pound-feet of torque, good for a 0-60 time in the three-second range and capable of tackling the Nordschleife, will finally become a reality. In the meantime, you can check out a piece of the action in the image gallery above. Related Video: Featured Gallery 2016 Audi R8 E-Tron: Spy Shots View 9 Photos Image Credit: CarPix Green Spy Photos Audi Coupe Electric Performance