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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 recalls 17,500 SRX CUVs in Canada

When reporting on recalls, Autoblog generally tries to focus on the US market. However, a recent campaign in Canada seems important enough to be worth mentioning because it could eventually affect American drivers. General Motors is repairing 17,481 Canadian examples of the Cadillac SRX from the 2010-2015 model years because of the possibility of a loose nut in the rear suspension. For the moment, the automaker hasn't yet announced whether the CUV in the US would require a similar campaign.
The notice was dated September 18, 2014, on the website for Transport Canada, similar to the National Highway Traffic Safety Administration in the US. It says, "the rear suspension toe link jam nuts" might not have been sufficiency tightened, which could allow a rear wheel to turn "inboard or outboard" while driving. If this happens, it could cause a sudden change in handling. Canadian Cadillac dealers are inspecting the parts and replacing the toe link if necessary.
This campaign isn't listed on the GM's running recall tally from September, which includes exported models, but it does list four other campaigns for the SRX this year - three in this range of years and one for the 2004-2006 model. Autoblog reached out to the company to ask about the possibility of this recall expanding to the US and were told "We have not publicly announced US recalls" for the issues affecting the SRX. The New York Times was given a similar quote. Scroll down to read the notice from Transport Canada.

GM intends to offer semi-autonomous vehicles by 2020

Prepare for a few years of technological saber-rattling, as the world's automakers begin pushing to bring self-driving cars to market. Earlier this week, Nissan announced that it aims to offer autonomous vehicles by 2020, while Google, BMW and several other marks are working on similar efforts.
General Motors is doing things differently, though. Rather than push for a fully autonomous car, it's continuing to refine its semi-autonomous Super Cruise, a product that we tested in April 2012 and that will eventually see use on some Cadillacs before trickling down to the rest of the General Motors family. Super Cruise, which is undergoing testing in the Cadillac SRX, doesn't take complete control out of the driver's hands. Rather, under a very specific set of circumstances on the freeway, it will marry the capabilities of things like lane departure warning and adaptive cruise control to allow the driver to take their hands off the wheel. All of which sounds a lot like the system Mercedes-Benz is launching on the 2014 S-Class.
The system is still in development, according to John Capp, GM's director of electrical controls and active safety technology. Now that that the biggest hurdle, steering control, has been cleared, GM's engineers can focus on things like teaching the system to adapt to differing road conditions and visibility levels. As we reported in 2012, Super Cruise is still befuddled in low-visibility situations or when road markings aren't particularly clear.