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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 ATS Coupe headed for Detroit reveal

Cadillac wouldn't be Cadillac without its two-door models. But the XLR has been discontinued for over four years now, the Elmiraj concept may never see production and the future of the CTS Coupe is still up in the air. That leaves just the ELR, which may not be conventional enough for traditional Cadillac coupe buyers. Fortunately a new coupe is coming along to fill the void.
According to Edmunds, Cadillac will reveal the new ATS coupe just a couple of months from now at the Detroit Auto Show. Expected to mechanically mirror the existing ATS sedan, the new coupe will also more conventionally resemble its four-door counterpart than the CTS, whose coupe version was distinguished by a rakishly sloping roofline.
Expect the same choice of engines to carry over, with a 2.5-liter four serving as the base engine, and both a 2.0-liter turbo four and a 3.6-liter V6 offering more power for those looking for that extra bit of oomph. Following the Detroit reveal, sources anticipate the ATS coupe to go on sale next summer.

Cadillac XT3 caught covered in copious camouflage

While a bit difficult to tell thanks to the impressive camouflage used, what we're looking at here is likely the upcoming Cadillac XT3. There are a few details that stand out to lend credence to this prediction. There are a handful of sharp angles scattered throughout that are in line with Cadillac's modern design language. Specifically in the LED running lights and on the side mirrors. The rear profile also is reminiscent of the current, and slightly larger XT5. The rear lights extend into the D-pillars, which would match the current Escalade. We get a pretty clear picture of the rear suspension on this XT3. It's clearly an independent rear suspension using coil springs. While General Motors uses independent suspension on some of its crossovers, we can't quite match it to a particular model. We believe that if the XT3 is based on an existing model (which it almost certainly is), the platform and suspension have been substantially modified. The XT3 could use a version of the D2XX platform that underpins the Buick Envision. However, we know from a previous report that the XT3 will likely be built at the factory that produces the Buick LaCrosse and Chevy Malibu. The XT5 uses a modified version of the LaCrosse/Malibu platform, so it's possible the XT3 could use a shorter version of the XT5 chassis. Depending on how small the XT3 ends up being, it might even share a platform with the Chevy Trax and Buick Encore. However, considering their economy car roots and torsion-bar rear suspension, we think that's the least likely. Regardless of what chassis is underneath its crisp bodywork, we expect the XT3 to be released sometime next year. Related Video: