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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 drops the base engine in the 2017 ATS

Cadillac, in an effort to boost sales of the slow moving ATS, is making some changes to the 2017 model. Most notably, the luxury manufacturer is dropping the base 2.5-liter normally-aspirated four-cylinder engine from the lineup, leaving the 272 hp 2.0-liter turbocharged four as the base engine. The base 2.0-liter ATS will start at $35,590, $1,380 more than the 2016 model, though that's partially offset by more standard equipment. The base model now comes standard with Cadillac's controversial CUE infotainment system with an 8-inch touchscreen display, a Bose surround-sound speaker system, and a backup camera. Despite the bump in price for the base model, all other ATS trim levels will see prices reduced between $650 and $1,100, depending on the model. The ATS was designed to be Cadillac's answer to the BMW 3-Series and Mercedes-Benz C-Class. Though the ATS was originally released at a time where the Germans were slightly off their game, it's never quite matched up in terms of performance or customer perception posting disappointing sales figures compared to the competition. Cadillac has had problems getting customers into cars, and few ATS customers are converts from luxury competition. In order to offload inventory and lure in new customers, the company has previously been forced to offer big lease deals. Many of these customers have come over from more mainstream brands like Chevrolet and Ford. ATS sales have fallen 23 percent through May versus 2015. The car's market share has fallen every year since 2013, currently occupying just 4.5 percent of the compact luxury market. Unless Cadillac can offer some truly amazing deals, we don't expect many shoppers to buy American over the strong German competition. Related video: Cadillac Luxury Sedan

Cadillac CT6 to be lighter than CTS, get PHEV model

Cadillac is suddenly one of the most talked about automakers in the US with Johan de Nysschen taking control. The brand claims that it eventually wants to become, once again, the standard of the world. One of the first vehicles to actually prove whether that's possible is its upcoming CT6 flagship sedan. We still don't know what the production version looks like undisguised, but other important details are falling into place. The latest big news sheds some light on the Caddy's powertrain and some estimates of its weight and size.
General Motors product chief Mark Reuss dropped the details at the automaker's Global Business Conference. According to The Detroit News, he revealed that the CT6 would use a twin-turbocharged, 3.0-liter six-cylinder engine with an eight-speed automatic transmission, and a plug-in hybrid would be an additional option. He reportedly claimed it would be the most "powerful six-cylinder gas engine in the segment" and said the hybrid could get around 70 miles per gallon.
Reuss also revealed that the CT6 would be about 53 pounds lighter than the current CTS, despite being about 8 inches longer, according to The Detroit News. If that's the case, the new flagship is about 203.5-inches long, which is 1.5-inches more than the XTS.