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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.

Cadillac CTS-V spotted with big exhaust, new grille?

If you thought Cadillac was content to leave its twin-turbocharged Vsport as the range-topping CTS, think again. Behold, our first good glimpse at the next-generation Cadillac CTS-V sedan, sporting more aggressive styling (somewhere under there), meaty quad-exhaust pipes, and what very well could be a new face for the V-badged Caddies.
Creating an all-new grille design seems like an awful lot of work just for a prototype, so it's very possible that the vertical-bar treatment you see here could make its way into production. Our spy photographers have pointed out that they've seen this same sort of grille treatment on prototypes for the smaller ATS-V sedan, and we've heard V-series models may soon have greater differentiation from the standard vehicles that sired them - that seems especially necessary if Cadillac insists on expanding this whole Vsport range.
Regardless of how its front end looks, the CTS-V ought to be a real monster. Industry sources say we can expect to see a supercharged version of General Motors' 6.2-liter V8 under the Caddy's hood, and considering the current car already makes 556 horsepower and 551 pound-feet of torque, we wouldn't be surprised to see a decent increase in both of those numbers. After all, one of the CTS-V's main competitors, the Mercedes-Benz E63 AMG, is currently putting out 550 hp and 590 lb-ft of torque. Could this mean a 600-hp Cadillac is on the horizon?

GM recalls Chevy Impala, Cadillac XTS for braking problem

Back in April, General Motors launched an investigation into braking issues affecting the 2014 Chevy Impala. Now there's a recall of both the Impala and the Cadillac XTS with which it shares its Epsilon II platform.
The issue apparently revolves around the electronic parking brake, which may not properly disengage. As a result, the rear brake pads could rub the rotor even while the vehicle is in motion, causing "significant heat, smoke and sparks." The earlier investigation had been launched following a complaint regarding the forward collision avoidance system, which is now either appears to have been unrelated or possibly a symptom of this larger issue.
The recall affects 2013-15 XTS models manufactured between February 14, 2012, and August 22, 2014, as well as 2014-15 Impalas manufactured between January 15, 2013, and August 22, 2014. The total number of affected vehicles reported by the National Highway Traffic Safety Administration comes to precisely 132,921 units, while The Detroit News reports a higher total of 205,000 units - the difference potentially coming down to the scope within the US and more broadly across North America. Dealers will contact owners to update the software in order to fix the problem.