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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.

Spy video shows Audi RS4 Avant twin-turbo V6 lapping the Nurburgring

Nurburgring testing season is in full swing, and Audi took some of its newest upcoming models for a spin. That means our first listen to Ingolstadt's new, turbocharged RS engine under the hood of the RS4. Based off the updated A4, the new RS4 Avant is a return to the performance variant's roots. The original RS4 (and early versions of the S4) used twin-turbo V6 power, although more recent models stuffed the beloved 4.2-liter V8 under the hood. The turbo engine in the new model is also rumored to find its way into the back of the R8 supercar. We don't know horsepower figures yet, but with 450 horsepower as the benchmark from the last RS4 we expect big numbers from the six-cylinder. The new engine might be just as powerful as the old V8, but as you'll see in the video, it's missing the phenomenal growl that the 4.2-liter made as it revved to the sky. This new car is quiet, especially compared to the ear-tingling five-cylinder note of the TT RS testing alongside the wagon. A quiet performance car is fine if you like stealth, but with its flared wheel arches, oval exhausts, and big wheels, the RS4 is a car that's anything but subtle. Related Video: News Source: Car Spy News via YouTube Spy Photos Audi Wagon Luxury Performance Videos

Next-gen Audi A5 shows its heavily camouflaged face

The new Audi A4 is set to launch at the Frankfurt Motor Show in September, so it shouldn't come as too big of a surprise that an updated A5 is on the way, as well. Our spies just caught the coupe testing for the first time while wearing heavy camouflage from nose to tail. Despite the concealment, some details are possible to make out, especially when comparing the two-door design to the previously spied A4. Audi is further differentiating the designs, and the A5's front end is significantly changed based on these photos. The headlights appear larger and more acutely angled than the narrower units on the sedan. Also, the lower bumper gets square intakes at each corner and the shape creates an additional opening in the center for the coupe. In profile, it's easy to notice the quicker sloping roof and smaller side windows. Only the rear end of the two models seem to share many significant cues. The new A5 reportedly rides on the same MLB Evo platform as the upcoming A4 to shed around 200 pounds. The two models might not launch at the same time, though, and the coupe could join the lineup somewhat later. S5 and RS5 variants are expected to join the range further down the line, too.