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How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

2013 Cadillac ATS 3.6 AWD

All-Wheel, All Right
There is no escaping the luxury all-wheel drive empire Audi has built for itself over the past 15 years. While nearly every high-end marque has at least one offering with power at all four corners, the hardware can't help but play second fiddle to Ingolstadt's Quattro kingdom. Leather-lined all-wheel drive is simply Audi the way minimum wage is an English degree. But General Motors seems hell-bent on raiding as many established fiefdoms as possible with the 2013 Cadillac ATS. Engineers and designers made no secret of the fact that the baby Cadillac was penned specifically to take on the BMW 3 Series, but Audi should be no less concerned about the newest luxury prince from Detroit.
GM has been stuffing all-wheel drive systems under their vehicles for years, but the effort hasn't come without nasty side effects. Unfortunate understeer, extra ride height, smallish wheels and porky curb weight meant opting for all-wheel drive was like signing your driving pleasure's death warrant. Would you like polished brass or brushed nickel hardware for your right foot's coffin, sir?

Meet the next president's new Beast, a giant bomb-proof limo

We don't know who will be our president in 2017, but now we have a better idea of how that person will be transported on land. The next presidential limo, officially referred to as the presidential state car, will be another Cadillac. And a big one. You're looking at a lone spy photo of a car that will be of high interest to actual spies – not to mention Secret Service agents and lots of law-enforcement types. President Obama has been riding around in a Cadillac nicknamed The Beast for a while now. (It recently made an appearance on Comedians in Cars Getting Coffee.) Over the Secret Service radios, it goes by Cadillac One and Limo One. While the current car looks like a stretched Cadillac DTS sedan, it's actually kind of huge and built on a Chevrolet Kodiak medium-duty truck chassis. The same is likely to be true again, but this one will look a lot more like the latest Cadillac models. Through the camo we can see a front end reminiscent of the new CT6 large sedan. Imagine one of those scaled to about 5/3 of the production car and you've got the right idea. Fun fact: It will be the first presidential limo to feature Caddy's new wreathless crest logo on its grille. View 6 Photos As for features, we're in the dark and will remain so even after the new president-mover goes into service. The details are a legitimate matter of national security, but you can bet it's bulletproof, can withstand small bombs, and has some kind of onboard secondary air supply in case of a chemical or biomedical warfare attack. Oh, and it has that big red phone in back in the event things get really bad. The new one will no doubt carry the latest communications and safety technology. The new presidential limousine has been in the works for some time. The government sent out a request for proposals in 2013, and this model is expected to go into service sometime in 2017. Chances are it will make its debut at the inauguration of [INSERT CONTROVERSIAL NAME HERE] in about a year's time. Related Video: