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Audi builds 5-millionth vehicle with Quattro

Quattro, the trademark name Audi has put on its all-wheel-drive system engineered for passenger vehicles, recently celebrated its five-millionth installation. The driveline has been offered in more than 140 different vehicles since its introduction more than three decades ago.
The all-wheel-drive technology made its world debut at the 1980 International Geneva Motor Show, beneath the floorpan of the Quattro Coupé, a low-volume two-door. It didn't take consumers long to embrace Audi's innovative approach. While most four-wheel-drive systems at that time utilized heavy transfer cases or second cardan shafts, Quattro was virtually tension-free, light, compact and efficient. Most importantly, enthusiasts found it was especially suitable for sports cars.
Today, the automaker offers Quattro on its full line of passenger vehicles and it is unquestionably successful (the technology enjoyed a 43 percent take rate in 2012). On models with transverse-mounted engines (A3 and TT), Audi uses an electronically controlled multi-plate clutch with hydraulic actuator. Under normal conditions, the clutch sends power almost exclusively to the front wheels (if wheel slippage occurs, up to 100 percent of the torque may be sent to the rear). Vehicles with transverse-mounted engines (A4, A5, Q5, etc...) use a self-locking center differential sending 40 percent of the engine torque to the front axle and 60 percent to the rear under normal conditions (it is able to send the majority of the power to the axle with better traction when needed). The highest-performing Quattro systems use torque vectoring to further improve cornering grip and speeds.

2015 Rolex 24 at Daytona pre-race notes

Reigning Indy 500 champion Ryan Hunter-Reay summarized our feelings on every year's Rolex 24 Hours at Daytona when he said, "The 24 kind of kicks off the year and has become part of my calendar... It definitely helps you get in race shape after a long layoff." Speaking of IndyCar drivers, 14 of the 33 pilots who started last year's Indy 500 are driving in Daytona this year, and an IndyCar driver has been part of the overall winning team for the last four years. The race starts at 2:10 pm Eastern Standard Time, here's where you can watch it: 2-4 pm: Fox Sports Network 4-8 pm: Fox Sports 2 8-10 pm: Fox Sports 1 10 pm-7 am: IMSA TV on IMSA.com - commentary available here for the full 24 hours 7 am – 2:30 pm (Sunday) – Fox Sports 1 Timing and Scoring Andy Blackmore's typically awesome Spotter's Guide Video primer on the four classes: Prototype (16 in this year's race), Prototype Challenge (8), GT Le Mans (10), GTD (19), and how to identify them. Daytona International Speedway: tri-oval with an infield road course, 3.56 miles long, 12 turns Entry list Qualifying results We've tagged along with Audi for the 53rd running of the race, which marks the first event in the Tudor United SportsCar Car Championship. After a difficult first year of teething – IMSA president and COO Scott Atherton said, "Everybody on our staff and everybody that raced with us last year would tell you it was the most challenging season on record" – some things are smoother this year, some things aren't, starting with the field: 53 cars are expected to line up, 14 fewer than last year, the smallest field since 48 cars lined up in 2011. The Prototype class shed three teams from 2014 and the GT Daytona class lost ten, so there's a 19-car field in that class (nine Porsche 911 GT Americas, three Ferrari 458 Italias, two each of the Aston-Martin V12 Vantage, Dodge Viper SRT, Audi R8 LMS, and one BMW Z4). Truth be told, last year's number was probably inflated by having the previous American Le Mans Series and Grand-Am Rolex Sports Car Championship combined to make the USCC; the field in 2013 was 57 cars, in 2012 it was 59 cars. Another factor in this year's race is that the GT class adopts FIA GT3 rules from next year. Brad Kettler, manager of Audi's customer motorsport program, said they'd sold five R8 LMS cars last year but zero for this year – there are undoubtedly teams waiting on the sidelines for the rules unification before spending the money.

Bathurst 12-hour gallery is GT3 heaven [w/video]

The 2015 Liqui-Moly Bathurst 12-Hour race was run this weekend at the Mt. Panorama Circuit in Bathurst, Australia. Race photographer Joel Strickland sent us a huge batch of photos, all of which make us salivate for the switch to GT3 rules in the United SportsCar Championship; the top seven finishers at Bathurst were of seven different makes: Nissan GT-R NISMO GT3, Audi R8-LMS Ultra, Aston Martin Vantage GT3, Bentley Continental GT3, Mercedes SLS AMG GT3, Ferrari F458 Italia and Lamborghini Gallardo. It was a sweet victory for the No. 35 car driven by the NISMO Athlete Global Team after it crashed in Saturday qualifying, and then was only in third place on the penultimate lap. The three-man driving team included two GT Academy winners, one of whom, Florian Strauss, has only been a professional race car driver for 18 months. It's the first time the GT-R has won at Panorama since the original R32 "Godzilla" took back-to-back wins in 1991 and 1992. Second place went to the No. 15 Phoenix Racing Audi R8-LMS Ultra, 2.4 seconds behind the winners, third to the Craft Bamboo Racing Aston Martin Vantage not even half a second behind the Audi. The Bentley Motorsport team, in its first Bathurst 12-Hour with two cars, had its No. 10 Continental GT3 in the lead until the penultimate lap and in second place until the final corner, but crossed the line in fourth after some rubbin'-is-racin' action from chasers. And if pictures aren't enough, as of writing you can still watch the live stream of the entire race at the Bathurst 12-Hour site. Or, if you don't have the time, at least be sure to check out the last five minutes, below. Enjoy. Featured Gallery 2015 Liqui-Moly Bathurst 12-Hour View 118 Photos Image Credit: Copyright 2015 Joel Strickland / AOL Motorsports Aston Martin Audi Bentley Nissan Coupe Racing Vehicles Videos aston martin vantage gt3