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Audi reveals even more efficient 2015 R18 E-Tron Quattro

We've seen two of this year's LMP1 manufacturer challengers – Porsche's updated 919 Hybrid and Nissan's GT-R LM Nismo. Audi has finished cooking up the successor to its Le Mans champion and unveiled the fifth-generation R18 E-Tron Quattro, even better than before. The bodywork monocoque is carried over, but the body around it has been reshaped to improve airflow from front to rear with a new hood, front fenders and wheel arches, and radiator configuration. The engine cover behind the cockpit is shrunk more closely around the engine, and there are new headlights. The hybrid system can expend double the energy per lap this year, putting Audi in the four-megajoule class under the energy-use regulations. That extra energy will come from 17-percent more capacity built into the flywheel storage system and an electric motor good for 272 horsepower. The revisions haven't increased the weight of the car, pegged to the minimum allowed at 870 kilograms. They have, however, forced changes to the TDI engine, which has to use 2.5-percent less fuel per lap to offset the increased hybrid output. The 558-hp V6 has been optimized such that it "managed to more than compensate for the loss" of fuel allowed, and Audi expects "significantly" lower lap times this year and less fuel used. We're still waiting to see what Toyota has done to its World Endurance Championship-winning racer, but we're already looking forward to this year's Le Mans. It's going to be cracking. You'll find a press release below the videos with more info on the Audi. Related Video: New Audi R18 e-tron quattro even more efficient - Aerodynamics, hybrid drive and many other details improved - Efficient TDI engine consumes even less fuel than before - Technologies from Le Mans winning cars now in production at Audi Ingolstadt, March 21, 2015 – Audi is starting the 2015 season with a thoroughly revised R18 e-tron quattro. In the FIA World Endurance Championship (WEC) and in the Le Mans 24 Hours as the season's pinnacle event, Audi is going to compete with a hybrid sports car in the 4-megajoule class. A twofold quantity of hybrid energy, fundamentally revised aerodynamics, the next step in lightweight design and a lot of detailed work characterize the fifth generation of the Audi R18. "The possibilities of the revolutionary regulations that have been in effect for LMP sports cars since 2014 are far from having been fully used.

Audi's Quattro division is now Audi Sport, and it has 8 new models on the way

Audi announced today that its Quattro GmbH performance and technology division will officially be renamed Audi Sport GmbH. The name change is the first since the division's introduction in 1983, and it should more clearly describe its function within the company and remove confusion with the Quattro all-wheel-drive system offered on all Audis, sporty or not. With its new name, Audi Sport will continue to handle the brand's RS models, the R8, customer race cars, customized road cars, and Audi Sport lifestyle products. While the clearer new name is good news, we're more interested in the division's announcement that it will release eight new cars in the next 18 months. The company didn't reveal exactly which cars these will be, but it did clarify which cars Audi Sport is currently responsible for. These include all variants of the RS 3, RS Q3 crossover, RS 6, RS 7, TT RS, R8, and S8 plus. Since the A4/S4 and A5/S5 models were just redone, we can guess that they will be next on the list for RS-ification, resulting in new RS 4 and RS 5 models. If that includes Sportback, coupe, and cabrio versions of the RS 5, and an RS 4 sedan and Avant, that would put us up to five already. Both the A6 and A7 have only seen a minor refresh recently, so it's likely that we'll see new versions of each soon followed by their own RS variants. However, whether those fit in the 18-month window will depend on how soon we see the standard models. Our other guesses are a bit fuzzier, and based completely on speculation. We could imagine one or two ultra-high-performance R8 models being announced – something like the last-gen R8 GT, perhaps offered in coupe and spyder forms – as well as RS versions of the other members in Audi's crossover fleet, the Q5 and Q7. It's also possible one of the models could be a new customer race car, since Audi Sport currently builds and sells the R8 LMS race car. At the very least, we know the Audi Sport folks are busy and people will no longer get them confused with an all-wheel-drive system. Related Video:

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.