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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.

GM announces 3 new recalls affecting 1.7M vehicles in North America [w/video]

Still embroiled in the ongoing ignition switch recall, General Motors announced today three more discrete recalls, affecting a grand total of 1,546,900 vehicles in the US. The Detroit News reports that some 1.7 million vehicles are affected overall in North America. The first and largest of the trio of new recalls concerns some 1.18-million Buick Enclave and GMC Acadia crossovers from the 2008-2013 model years, Chevrolet Traverse from 2009-2013 (pictured above) and Saturn Outlook vehicles from 2008-2010. All of the crossover utilities may have an issue with the wiring harness for their seat-mounted side airbags. Apparently, the vehicles are equipped with a Service Air Bag warning light that, if ignored, "will eventually result in the non-deployment of the side impact restraints." Those restraints include the side airbags, a front-center airbag if the vehicle is so equipped and seatbelt pretensioners. Dealers of affected vehicles will be instructed to remove driver and passenger side airbag wiring harness connectors, and then "splice and solder the wires together." The second recall affects 303,000 Chevrolet Express (pictured right) and GMC Savana vans from model years 2009-2014, and with gross vehicle weights under 10,000 pounds. Said vehicles do not comply with a head impact requirement for unrestrained occupants, and will need a reworking of the instrument panel material to be sent back on the road. It doesn't sound as though there's a quick fix for this one, as the GM press release states: "Unsold vehicles have been placed on a stop delivery until development of the solution has been completed and parts are available." Finally, the third recall affects 63,900 Cadillac XTS luxury sedans from model years 2013 and 2014. A brake booster pump may be susceptible to corrosion by way of the relay, potentially causing and electrical short, overheating, melting of plastic components and even engine fires. GM says it is aware of two engine fires in unsold XTS models and two cases of melted parts. Repairs for the issues affecting the XTS have not not mentioned by GM in the release. The Detroit News is also reporting that along with news of the triple-recall, GM is taking a $300-million credit to help pay for the repair costs, and to deal with the ongoing costs associated with the ignition switch recall. In an attempt to explain just what GM has been doing in the face of these very serious issues, newly minted CEO Mary Barra has addressed the issues in a new video.

GM Cadillac chief: New CT5 will replace 3 sedans; EVs coming

DETROIT - The head of General Motors' Cadillac luxury division said on Thursday the brand will shrink its lineup of sedans and expand its offerings of sport utility vehicles and hybrid and electric vehicles in response to market shifts. Expanding Cadillac's global sales is central to GM's overall profit strategy, and Cadillac has reported a 27 percent increase in worldwide sales through the first half of the year. However, in the United States, now the brand's second largest market behind China, Cadillac sales are down 1.6 percent and combined sales of the brand's four sedan models have plummeted 16.3 percent through the first half of the year. That has forced GM to order layoffs at two Michigan factories that build Cadillac cars, and raised questions about the long term future of the plants. "We have to rebalance our sedan portfolio," Johan de Nysschen told Reuters in interview, offering new details about the strategy. Cadillac will not directly replace the current XTS, CTS or ATS sedans when they end their life cycles in 2019, he said. Instead, Cadillac will use a single new car called the CT5 to appeal to consumers shopping for sedans priced between $35,000 and $45,000. New versions of the CT6 sedan will be offered to customers who want a larger car starting at $50,000. Sources had told Reuters last week that GM was considering ending production on six cars including the CT6 and XTS and models from Chevrolet and Buick. That report now appears only half-right as far as Cadillac is concerned. The new CT5 will be built at a factory near Lansing, Michigan, that currently builds the slow-selling Cadillac ATS and CTS models. A small luxury sedan to compete with the Audi A3 will be built in the same plant, de Nysschen said. Cadillac will offer more SUVs, starting with a compact model called XT4, followed by a larger SUV with three rows of seats due by 2019 to compete with vehicles such as Volvo's current XC90 model. Volvo, owned by China's Zhejiang Geely Holding Group, scored a public relations coup by announcing plans earlier this month to power all its vehicles with either hybrid or all-electric technology starting in 2019. The move challenges Tesla, which has eclipsed more established brands with tech savvy luxury buyers. Cadillac has plans "not dissimilar to what Volvo has announced," with more electrified vehicles launching in the second half of the next decade, de Nysschen said.