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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 chief says ATS convertible, wagon on the table

What we do know is that the ATS will wear at least one more bodystyle. That comes from Cadillac head Bob Ferguson, who answered "Absolutely" when Automotive News asked him about the possibility of another variant. What we don't know is what that bodystyle or styles will be.
We now have a sedan and coupe ATS, there's supposedly a V sedan coming. After that, a convertible is a likely option given that the man who just became the global product honcho at General Motors, Mark Reuss, admitted to having one already designed in 2012. The decision on it can't get out of the underworld and a wagon is the other option, but the droptop would seem to make the most sense if one considers the competitive set: the BMW 4 Series and Audi A5 convertibles are hot property and Mercedes is bringing a C-Class convertible. Meanwhile wagons are the sentimental utility vehicles that, refusing to die, seem forever destined for life support... CTS Sport Wagon, anyone?
Based on Ferguson's statements, it appears that what Cadillac definitely won't do is play model variant catch-up with the European luxury brands it has spent years hunting down, telling Automotive News, "We want to keep our focus on a limited number of vehicles and do them very well."

GM cutting production at two plants

General Motors is continuing to adjust to excess supply of some of its brands' models. To get production more in line with the vehicles' actual demand, the automotive giant is idling two of its factories in North America in the coming months. The Orion Assembly plant is going to be down from March 9-13, according to an anonymous plant worker and another insider speaking to Automotive News. The factory builds the Chevrolet Sonic and Buick Verano, but there are plenty of both models sitting on dealer lots, including 216 days worth of Sonics, according to AN. The factory already had two idle periods announced to reduce the excess. In addition, downtime is scheduled at GM's "Flex" line at the Oshawa, Ontario, Canada, plant from April 13-17. This affects supply of the Chevrolet Camaro, Impala, Buick Regal and Cadillac XTS. Among them, the automotive giant has the largest supply of Regals ready for dealers with 213 days worth of them, according to AN. The future for the whole Oshawa factory is cloudy in general, though. There are rumors that it could close entirely in the future because the Camaro is leaving and the Regal and XTS might not last much longer than 2017. The Canadian government and the labor union there intend to put up a fight, though. News Source: Automotive News - sub. req.Image Credit: Bill Pugliano / Getty Images Plants/Manufacturing Buick Cadillac Chevrolet GM orion assembly oshawa plant idle