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Race Recap: 2013 Twelve Hours of Sebring, cakewalk up front, grindfest out back [w/spoilers]

This year's 12 Hours of Sebring wasn't exactly a foregone conclusion because we're still talking about racing, and anything can happen when the speeds are as high as the adrenaline and the desire. But we're still talking about Audi bringing it's two top-spec racers - and its huge budget and its nearly neurotic attention to detail - to a race that it uses as a test bed for The 24 Hours of Le Mans and as a way to open the endurance racing season with a victory.
Besides, 12 hours is a long time, especially at Sebring, and things didn't go all Audi's way. On top of that, although it was a pretty quiet race, behind the Audis things got even grimier, with plenty of battles, plenty of mechanical issues, and the new BMW Z4 GTE and Viper GTS-R being race tested. Oh, and that brand new chromed-out DeltaWing...

2016 Chevrolet Camaro: Everything we know so far [UPDATE]

UPDATE: We fully expect the floodgates to open as facts and photos leak throughout the day. Watch this space for more information as it breaks, including these leaked photos, and some new powertrain speculation. Chevrolet has made a grand production of teasing the all-new, sixth-generation Camaro. That slow trickle will become a deluge this weekend, when the 2016 model hits the stage on Detroit's Belle Isle as part of an all-day Camaro-palooza. Considering you're likely to hear plenty about the next-gen muscle car in the next couple days, we figured now is the perfect time to sort out all the facts and rumors we've heard about the next-generation coupe that's coming this weekend. Here's everything we know about Camaro Six. What Will It Look Like? Arguably the easiest Camaro question to answer after all the teasers and spy shots, General Motors' design team favored evolving the current car's retro design language while retaining the same basic shape. The long hood will carry on, joined by an even shorter, wing-topped rear deck, giving the 2016 an almost fastback-like look. The greenhouse is still slim, but lateral visibility may improve slightly owing to the larger quarter windows. We can only hope. The rear end looks to have been rounded, while Chevy's own teaser shows off larger, more prominent taillight housings than the simple rectangular lights on today's car. Expect quad-tipped exhausts to be offered on at least one version of the Camaro. Judging by the single teaser of the car's profile, the rear haunches will be larger and more chiseled. The muscular aluminum hood and its accompanying power bulge are more heavily styled than on today's car, although it looks largely similar in terms of size. It sits atop an even slimmer upper grille that's barely big enough for Chevy's Bowtie logo, with most of the visual mass moving to the gaping lower grille. One of the more tantalizing rumors surrounding the new Camaro focuses on its roof. As evidenced in a rather bizarre round of spy photos, it almost looks like Chevy is considering a removable panel, a la Corvette Stingray. T-tops are also a distinct (and more probable, we hope) possibility. The new shape will result in a more aerodynamic car, and Chevy claims the 2016 Camaro spent 350 hours in the wind tunnel. Overall lift has apparently been cut by 30 percent, thanks partially to a new, smooth underbody panel. Chevrolet has been far less forthcoming with information on the new Camaro's cabin.

2016 Chevrolet Colorado Diesel First Drive [w/video]

The first thing you notice inside the diesel Chevy Colorado is that it's quiet. Almost too quiet. A lot has been done to quell noise and vibration with this new powertrain, and it shows – or rather, doesn't. There's some characteristic diesel clatter at idle, but even then it's distant and practically disappears as you start moving down the road. At full throttle, when the engine is at its noisiest, the sound isn't particularly diesel-like, just a pleasant intake breath. The accompanying smoothness is almost eerie. When we ask where all the noise went, Chevy's engineers, marketing guys, and PR reps all explain that this refinement is what Americans want. We're still not sure. This is a truck, after all, and the diesel pickup customer is different from the guy buying a diesel Cruze for his highway commute. Chevy contends that they're also not the same as the buyer of a Silverado HD. Although this 2.8-liter Duramax four-cylinder has been in service elsewhere around the globe, its first US application is in the Colorado and its GMC Canyon twin. The engine puts out 181 horsepower and 369 pound-feet of torque, and it does so unobtrusively as a result of a lot of modifications for our market. To keep normal diesel sensations out of the cabin, the intake and oil pan both get acoustic treatments. A new, thicker material is used for firewall sound deadening. Redesigned balance shafts have tighter tolerances to increase smoothness. The diesel powertrain is smoother than the Colorado's gasoline V6. One of the more interesting and certainly unexpected vibration-reduction changes is a special torque converter from German supplier LuK equipped with a centrifugal pendulum absorber. This pendulum spreads from the center of the torque converter as engine speed increases and is tuned to absorb the four-cylinder's second-order vibrations, not just those in a narrow frequency band. It does an admirable job, especially considering the engine's biggish, 0.7-liter cylinders, which lead to bigger vibrations. The result is a powertrain that's smoother than GM's (not particularly smooth) corporate V6, which is available in the standard Colorado. It's quieter than a Cruze diesel and even out-softens some gas direct-injection engines on the market. Paradoxically, it may be the most refined of all of the Colorados. No vibration comes through the steering wheel, pedals, floorboards, or even the rearview mirror. But you can tell it's a diesel when you hit the throttle.