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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.

2015 Cadillac ATS Coupe prepares to fight BMW 4 Series

Cadillac introduced its new ATS Coupe at the 2014 Detroit Auto Show today, bringing customers an alternative to the growing range of sport luxury coupes typified by the BMW 4 Series, Audi A5 and Mercedes-Benz C-Class Coupe.
The ATS Coupe, as a slightly more premium offering, ditches the wheezy 2.5-liter engine found in the basic ATS Sedan, but retains the four-door's 2.0-liter, turbocharged four-cylinder and 3.6-liter V6. That four-pot turbo benefits from a fettling that has increased torque from 260 pound-feet to 295, although its peak is only available from 3,000 rpm to 4,600 rpm, unlike in the sedan, where peak twist arrives at just 1,700 rpm and sticks around until 5,500 rpm.
Power can be channeled to either the rear or all four wheels by the owner's choice of a Tremec six-speed manual or a six-speed automatic transmission. According to Cadillac, the new Coupe can get to 60 in 5.6 seconds when fitted with the 2.0-liter turbo.

GM may kill 6 car models as it works with UAW to tackle sales slump

The president of the United Auto Workers union said on Thursday the union is talking with General Motors about the potential threat to plants and jobs from slumping U.S. car sales. GM's response will be more trucks and SUVs, and sources say at least six slow-selling car models may be killed off. "We are talking to (GM) right now about the products that they currently have" at underused car plants such as Hamtramck in Michigan and Lordstown in Ohio, and whether they might be replaced with newer, more popular vehicles such as crossovers, Dennis Williams told reporters. "We are tracking it (and) we are addressing it," Williams added. GM has cut shifts at several U.S. plants this year as inventories of unsold cars have ballooned. Industry analysts said more jobs could be at risk as the automaker wrestles with permanently shrinking production of small and midsized sedans. GM is reviewing whether to cancel at least six passenger cars in the U.S. market after 2020, including the Chevrolet Volt hybrid, which could be replaced in 2022 with a new gasoline-electric crossover model, Reuters has learned from people familiar with the plans. Other GM cars at risk include the Buick LaCrosse, Cadillac CT6, Cadillac XTS, Chevrolet Impala and Chevrolet Sonic, sources said. Some analysts have singled out GM's Hamtramck plant in Detroit as one of the most vulnerable because of plummeting car sales. The plant, which opened in 1985, builds four slow-selling models: Buick LaCrosse, Chevrolet Impala, Cadillac CT6 and Chevrolet Volt. In the first half, it built fewer than 35,000 cars, down 32 percent from the same period in 2016, according to suppliers familiar with GM's U.S. production schedule. The typical GM assembly plant builds 200,000-300,000 vehicles a year.COMING ATTRACTIONS: TRUCKS AND SUVS GM must "create some innovative new products" to replace slow-selling sedans "or start closing plants," said Sam Fiorani, vice president of AutoForecast Solutions. The auto maker already has begun to shift future production plans from cars to trucks, according to Morgan Stanley auto analyst John Murphy. He estimates that fewer than 10 percent of the new vehicle models that GM will introduce over the next four years will be passenger cars, with the rest divided among trucks, SUVs and crossovers. GM plans to add production of the new Cadillac XT4 crossover next year to its Malibu sedan plant in Fairfax, Kansas.