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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.

2016 Cadillac CT6 has arrived

We have known for a while that the 2015 New York Auto Show would mark the debut of Cadillac's latest flagship model. But after months of waiting as Caddy slowly revealed details, the 2016 Cadillac CT6 has finally arrived. The sedan is a technological tour de force for the brand and inaugurates a long list of new technologies. The CT6 will begin production at the Detroit-Hamtramck Assembly plant in late 2015 and will go on sale with three engine options. Caddy won't release final figures yet, but based on preliminary numbers, we know the base 2.0-liter turbocharged four-cylinder will make 265 horsepower. Stepping up to the newly revised 3.6-liter V6 will net buyers an estimated 335 hp, and finally there will be the 3.0-liter twin-turbo V6 with an output of around 400 hp. All of these engines will be mated to eight-speed automatic transmissions, and six-cylinder models will get standard all-wheel drive that will be able to constantly vary the power sent to the front wheels. Carrying those powertrains is the new, aluminum-intensive Omega architecture. In addition to the lightweight metal making up the platform, the entire exterior also uses it to provide an estimated curb weight of less than 3,700 pounds. The decision to shed mass makes the CT6 a featherweight in its class – for comparison, the lightest, six-cylinder Audi A8 weighs 4,365 pounds. The sedan rides on a 122.4-inch wheelbase and is 204 inches long. That makes the Cadillac about 1.3 inches shorter than the smallest BMW 7 Series, but the Caddy is projected to tip the scales at less than both the big Bimmer and even the 5 Series, too. Cadillac wants the CT6 to be a luxury sedan that drivers can enjoy. In addition to the low weight, there's an available Active Chassis System throughout the range with rear-wheel steering and Magnetic Ride Control. When combined with the all-wheel-drive system, it means every corner of the car is both driving and steering the vehicle. Inside, the CT6 offers a ton of tech and luxury. Drivers are held in massaging, leather seats, and rear passengers also get adjustable chairs that are heated and cooled. Quad-zone climate controls keep everyone comfortable. Plus, in addition to the 34-speaker Bose audio system and streaming rearview mirror, there are features like a 10.2-inch CUE infotainment system with a capacitive touchscreen and console-mounted touchpad. The display also shows a 360-degree view outside and can even record video when the security system is activated.

2019 Cadillac XT4 First Drive Review | Fashionably late

SEATTLE, Wash. — The 2019 Cadillac XT4 compact crossover debuted in New York, Cadillac's recently-adopted home, several months ago. Since then, a lot's changed. Cadillac honcho Johan de Nysschen got the boot, the economy's continued to improve, and we've changed coasts to experience the XT4. The setting is Seattle and its environs, a place that embodies the moment – a town flush with tech money and outdoor lifestyle experiences. Oh, and traffic. Lots of that. What hasn't changed is that this is a vehicle that Cadillac desperately needs. Between and below the Escalade and XT5 are vast gulfs of white space that could swallow entire crossover-focused brands. The dealers, we imagine, howled. And de Nysschen was replaced, it turns out, by a career GM exec with a penchant for building bridges with dealers. Must be a coincidence. The XT4 should please everybody involved in that power struggle. It's cute, for one, which will make for happier dealer-customer interactions. It brings appreciable but unintimidating technological advances to a brand looking to flex some segment leadership muscles. And it doesn't strictly feel like a rebadged version of a lower-tier product, a bad habit that Cadillac keeps failing to kick. We'll discuss its competition within its segment, and how they compare to the XT4, in another piece to follow. If you're wondering where the XT4 comes from, the easiest way to think about it is as a cut-down version of the basic underpinnings of the XT5, wrapped in nicely-proportioned sheetmetal. To be blunt, there's more unadorned plastic on the lower fascia and rockers than we'd like at this price point, but the rest is handsome. Large, elegant lamps sit at both ends, set off with trendy creasing and little accent vents – Sport models have clear taillight elements, while others have red-tinted lenses. The XT5, itself a newer vehicle, looks outclassed and dated instantly when put up next to its sleeker, more modern little sibling. The interior, however, is more alike than different. The major shapes are similar, as are the placement of the switchgear. The 8.0-inch infotainment screen is, as in the XT5, embedded in a slabby wedge of dash. It's still a touchscreen, but a little dial now provides an alternate way to navigate. A Qi charging panel and easily accessible, but not too prominent, USB, charging, and aux inputs reside just above. The seats in our tester, a Premium Luxury trim, are covered in a soft, warm caramel-colored leather.