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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 recalling 524k vehicles over hood latches and toe link nuts

Just hours after confirming to Autoblog its intention to recall 97,540 vehicles in the US (117,651 in North America) for a possible manufacturing defect in the chassis control module of several models, General Motors is issuing two more campaigns that affect another 379,401 units in the US (524,384 in North America).
One campaign covers 290,107 US examples of the 2010-2015 Cadillac SRX and the 2011-2012 Saab 9-4X because the "rear toe link adjuster lock nuts" may be improperly torqued. If not up to spec, the toe adjuster link could separate and allow the wheel to shift while driving, making the handling unstable. GM says that it knows of three crashes and two injuries as a result of this problem. Dealers are inspecting the nuts and installing a new link assembly, if necessary. Autoblog first reported about this potential issue when it showed up on a list of recalls from Transport Canada.
The second recall is for 89,294 examples of the 2013-2015 Chevrolet Spark in the US manufactured from January 17, 2012, through July 29, 2014. According to GM, "corrosion can cause the secondary hood latch striker to stick in the open position." If this happens, and the primary latch also isn't engaged for some reason, the hood could fly open while driving. About 13,000 of these affected Sparks are at dealers and are being held until repaired. The fix requires replacing the hood striker. GM isn't aware of crashes, injuries or fatalities caused by this problem.

GM extending warranties on Cadillac CTS-V and Chevy Camaro ZL1 for supercharger issue

Okay General Motors, we've sat by and watched you recall the compact cars, crossovers and pickup trucks, and aside from reporting on it, we've been fairly quiet. This, though, this will not do. We can almost tolerate the recalls on the bread-and-butter cars, but leave the performance vehicles alone.
According to a report from The Car Connection, GM has discovered a problem with the superchargers of the 6.2-liter V8s found in the Chevrolet Camaro ZL1 and the Cadillac CTS-V. Apparently, the issue rests around the internal bearing shaft grease, which can become contaminated (we aren't sure with what). If left unchecked, it'll first lead to a rattle at idle, which goes away under slight throttle. The real warning stage is when a high-pitched squeal develops, signaling that the bearing shaft has failed. Naturally, severe engine damage is the next step (although it's possible that the engine will also just refuse to turnover, although neither case is desirable).
According to TCC, GM will replace the superchargers on vehicles that have exhibited symptoms of bearing shaft failure free of charge. It will also, allegedly, be extending the warranty on all supercharged ZL1s and CTS-Vs to 10 years or 120,000 miles (whichever comes first), from the date of purchase. Officially, only 2009 to 2013 CTS-Vs and 2012 to 2013 ZL1s are suffering from this issue.