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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.

Cadillac back on track with 600-hp ATS-V.R racer in FIA GT3 spec [w/video]

There was already a rumor brewing that Cadillac might eschew the CTS as its racecar next season in favor of the ATS Coupe. It turns out that is absolutely the case, and now we know just what this 600-horsepower, future racer looks like. The coupe might not be limited to competing in just the US, though, because it's built to FIA GT3-specifications, meaning that this Caddy is also eligible to race in over 30 series worldwide against the likes of Bentley, McLaren, Audi and other premium brands.
The heart of this massively winged Cadillac is an engine dubbed the LF4.R. It's based around the unit in the production ATS-V and CTS Vsport but with larger turbos, bigger intercoolers, side exhausts and other tricks. Cadillac claims it makes a monstrous 600 hp and 520 pound-feet of torque in unrestricted form.
As the photo above shows, the ATS-V.R also wears an aggressive aero kit with a carbon fiber front splitter, and a wing at the back that could probably double as a picnic table in a pinch. The dry weight of the whole package is quoted at about 2,900 pounds, which is around 700 pounds less than the street version.