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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 will kill the plug-in ELR

Johan de Nysschen, president of General Motors' Cadillac division, says Caddy's ELR extended-range plug-in won't have any future generations, Automotive News (subs. req.) says. The publication previously reported that the car would be around for another couple of years, but even that's questionable, and the model could be yanked even sooner. Cadillac spokesman David Caldwell confirmed that there won't be a second-generation ELR. "Subsequent generations of the car will not be developed," he wrote in an e-mail to Autoblog. "It's available currently as a 2016 model, and there's no change to that status." The model debuted in late 2013 and used a version of the powertrain in the Chevrolet Volt. The main problem, of course, was that the car had a $76,000 price tag that proved too much for most automobile buyers to stomach. Last year, GM sold 1,024 ELRs, down 22 percent from 2014's totals. By comparison, the Chevy Volt moved more than 15,000 units, and that itself was still down 18 percent from year-earlier figures. The merciful end to the ELR shouldn't be much of a surprise, as Cadillac Chief Marketing Officer Uwe Ellinghaus went on the record in December of essentially calling the model a dud. It's a far cry from the excitement, though, that the concept model of what was then called the Converj was unveiled to the public at the Detroit Auto Show in 2009. For those feeling misty-eyed or nostalgic, though, check here for Autoblog's First Drive impressions of the extended-range plug-in. Related Video: Featured Gallery 2014 Cadillac ELR Review View 48 Photos News Source: Automotive News-sub.req. Green Cadillac GM Hybrid elr extended-range plug-in

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.