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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.

Hennessy wastes no time in supercharging the 2015 Cadillac Escalade

The ink is still drying on the all-new 2015 Cadillac Escalade sales brochures, but that hasn't stopped Texas-based Hennessey Performance (HPE) from leaping out of the gate with its own high-performance variant. In stock form, the big fourth-generation Cadillac flagship arrives with a new small block naturally aspirated 6.2-liter Ecotec3 V8 delivering 420 horsepower and 460 pound-feet of torque. Fresh out of the showroom, the 5,900-pound SUV will sprint to 60 mph in 5.9 seconds.
While that is plenty fast for some owners, others don't want to be shamed by a 550 horsepower Mercedes-Benz GL63 AMG or a 510 horsepower Land Rover Range Rover Sport - both will leave the stock Escalade at a stoplight.
The team at HPE has come to the rescue with its HPE550 supercharger upgrade, which includes a belt-driven supercharger, air-to-water intercooler, recalibrated engine management software and a three-year/36,000 mile powertrain warranty. With 6 psi of boost, the direct-injected 6.2-liter is tuned to deliver an impressive 557 horsepower and 542 pound-feet of torque - gains of 32 percent and 18 percent, respectively, over stock. Although HPE isn't releasing performance figures as of yet, our math says that should be enough power to put the two Europeans in the Cadillac's rearview mirror. The company also offers a set of 20-inch lightweight H10 forged monoblock wheels, to further improve performance.

2015 Cadillac Escalade blings its way into LA

The new Cadillac Escalade sauntered out onto the Los Angeles Auto Show stage, showing off its new familial face and redesigned interior. That exterior, with its slim, wrap-over headlights and tall, vertical taillights (both made up of LEDs) is a subtle but significant departure from the past styling of General Motors' flagship SUV.
And while there's no shortage of stuff to discuss about the Caddy's exterior, its cabin is where the big changes happen. Aside from the column-mounted shifter, the cabin receives a heavy going-over, receiving Cadillac's new CUE infotainment system and a significant upgrade to the materials. Comparing it to furniture, Eric Clough, Cadillac's director of design for interiors, said, "An exceptional level of craftsmanship has gone into the redesign of the 2015 Cadillac Escalade, and it all centers on the premium materials and extensive use of cut-and-sew live stitching."
Under hood sits a 420-horsepower, 460-pound-foot, 6.2-liter V8. Fitted with direct injection and active fuel management, fuel economy for the big Escalade should get a much-needed boost beyond the current model's 14-city and 18-highway miles per gallon, although official numbers haven't been published quite yet. A six-speed automatic is the sole gearbox choice. Cadillac has also fitted the new Escalade with GM's magnetic ride control system, which should deliver a more refined ride than its predecessor.