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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.

2020 Cadillac CT6 losing the 3.0-liter TT V6?

In April we learned Cadillac would no longer offer the 2.0-liter four-cylinder on the CT6. The same day we heard the news, the CT6 configurator showed that engine option gone, leaving three engines on the menu. That menu could lose another option come 2020, according to a report in AutoVerdict. The site says it got an order guide for the 2020 CT6, and the 3.0-liter twin-turbo V6 won't make it to the new year. That engine was once the top-tier choice, since eclipsed by the detuned 4.2-liter twin-turbo Blackwing V8 imminently available on the Platinum trim. AutoVerdict also read in the order guide that the horsepower figures haven't been finalized for next year's model. As it stands, the entry-level 3.6-liter six-cylinder makes 335 horsepower and 284 pound-feet of torque, the 3.0-liter twin-turbo V6 produces 404 hp and 400 lb-ft, and the 4.2-liter V8 ginning up 500 hp and 574 lb-ft when it arrives. Retiring the middle option ostensibly puts a big ol' gap in output and pricing between the two models left. Right now $24,200 separates the entry-level Premium Luxury from the Platinum. However, since the present Platinum uses the 3.0-liter, it's safe to guess that the 4.2-liter V8 will cost more, creating a larger gap. The Sport model in between uses the 3.0-liter, too. Perhaps that goes away, or maybe it stays and gets further cosmetic upgrades to give it more edge and a higher price. Another change coming to the 2020 CT6 is its induction into Cadillac's metric-unit torque-based badging system. This, remember, converts pound-foot torque into Newton-meters, then rounds up to the nearest 50. That means the 3.0-liter V6 will wear a 400 badge, the 4.2-liter V8 gets an 800T badge - the T standing for turbo. The year's been full of engine rationalizations at General Motors. Theories about the CT6 dropping the 2.0-liter figured it might have been about making space above the CT5, or guaranteeing supply for other GM models that use the engine, like the Cadillac XT4. The folks at AutoVerdict suspect the 3.0-liter TTV6 could be making the move to the CT5, and to the hot-headed CT4-V we'll be getting a look at come the end of this month. Related Video:

2015 Chevy Silverado, GMC Sierra recalled for steering issues

DETROIT — General Motors Co is recalling more than 1 million pickup trucks and sport utility vehicles in the United States due to issues with a temporary loss of power steering, the National Highway Traffic Safety Administration said. The recall is for 2015 models. They are: the Chevy Silverado 1500, Suburban and Tahoe, GMC Sierra 1500, Yukon and Yukon XL and Cadillac Escalade. The problem may cause difficulty steering the vehicle, especially at low speeds, increasing the risk of a crash, the auto safety regulator said in a document dated Sept. 12. The document did not highlight any reports of accidents and injuries, because of the power steering issue. GM dealers will update the power steering module software, free of charge for owners of the affected vehicles. In 2014, the No.1 U.S. automaker had recalled nearly 800,000 pickup trucks worldwide because of the same problem. GM did not immediately respond to a request for comment.Related Video: