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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.

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 S1 rally car races its RC counterpart

Veteran racer Mattias Ekstrom campaigns the meanest looking Audi S1 on the block in the FIA World Rallycross Championship. With a 2.0-liter turbocharged four-cylinder pumping out a claimed 600 horsepower and all-wheel drive, this little hatch can reportedly hit 60 miles per hour in a wickedly quick 1.9 seconds. While those specs are mighty impressive, they don't really matter too much for Ekstrom's latest race in the S1 against a pint-sized doppelganger in the form of an RC replica of the rallycross machine around a warehouse. Despite, the massive gulf in size and power, the two Audis appear fairly evenly matched. The RC version can't quite match the real one in outright speed but can go under obstacles that Ekstrom's S1 is forced to drive around. Check out the clip above to see which S1 makes it to the finish first. Related Gallery EKS Audi S1 Supercar News Source: Audi Deutschland via YouTubeImage Credit: Related images copyright EKS Motorsports Toys/Games Audi Hatchback Racing Vehicles Videos rc car audi s1