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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 S1 nearly ready to rocket euros out of your pocket

Audi was out testing its upcoming S1 on the streets of Germany when our trusty spy photographers snapped the new, all-wheel-drive hot hatch that's set to succeed the limited-edition A1 Quattro.
Unlike the A1 Quattro, the S1 should sport a much less aggressive look overall. As shown in the spy shots, its wheel wells lack the meaty flairs of its predecessor while its rear wing is much more subdued. The wheels are more in line with what we expect from Audi's S models and its higher ride height is more conducive to common things like steep driveways and speed bumps that the 333-unit A1 Quattro might not encounter.
According to our spies, the S1 should hit the European market with anywhere from 220 to 250 horsepower, making it considerably more potent than competitors like the Ford Fiesta ST or Polo GTI from its parent company, Volkswagen (although it'll likely arrive at a considerably higher price than either of those pocket rockets). On the high end, that's roughly equal to the 252 ponies generated by the 2.0-liter, turbocharged four in the A1 Quattro