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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.

GM under fire from safety advocates over braking problem caused by recall fix

Safety experts are lambasting General Motors over what they say is the automaker’s slow notification of owners of certain 2019 sedans and trucks that a recall fix could cause power braking to fail and increase the risk of a crash, the Detroit Free Press reports.  GMÂ’s original recall in December targeted about 550,000 Cadillac CT6 sedans and Chevrolet Silverado 1500 and GMC Sierra 1500 pickups, all from the 2019 model year, over potentially defective electronic stability control and antilock brakes. In that case, GM said the errors would not show up as a diagnostic warning on the instrument cluster. But after GM had done recall work on 162,000 vehicles, about 1,700 owner have complained that their power brakes didnÂ’t work after they had the recall done and then used the OnStar app to start their vehicle. GM then issued a supplemental fix for customers whoÂ’d already had their vehicles serviced. In this case, a diagnostic warning should illuminate saying either “Service Brake Assist” or “Service ECS,” which GM says is a signal that a customer should not drive the vehicle and instead call their dealer, which will tow the vehicle and have it repaired. Safety advocates say the automaker hasnÂ’t gone far enough to protect customers. “The fact that you could potentially start a vehicle and not have brakes is a pretty risky proposition,” Sean Kane, president of the Safety Research and Strategies, which works on auto issues for plaintiffs and governmental organizations, told the Freep. “The fact that they wouldnÂ’t notify owners (sooner) is pretty stunning.” GM told the Freep it was required to notify the National Highway Traffic Safety Administration and file paperwork before it notified customers about the original recall, which was made Dec. 12. It then had to investigate and resolve the problem created by its original recall fix before alerting customers. GMÂ’s call center and dealers are contacting the remaining 900 customers who havenÂ’t yet had the update made to the original recall repair. GM also hired a vendor to send recall letters to the 550,000 customers affected by the original recall notifying them about the update. There are no known injuries or deaths related to the problem. Read the Freep story here.

2021 Cadillac Escalade ESV will debut at the New York Auto Show

LOS ANGELES, California — Cadillac pulled the wraps off its 2021 Escalade today at an event in Los Angeles, and we were there to see it all play out live and in living color. But while we have some specifications for the long-wheelbase ESV version, that model wasn't on display. According to the automaker, the next-generation Escalade ESV will get a formal debut at the 2020 New York Auto Show in April. The 2021 Cadillac Escalade ESV will boast a wheelbase of 134.1 inches and an overall length of 226.9 inches, making it 15.9 inches longer than the standard Escalade and 5 inches longer than the similarly extended Lincoln Navigator L. That extra length translates into 1.7 additional inches of third-row legroom and 17.4 more cubic feet of cargo space behind the third row over the standard Escalade. We expect the ESV will get the same two powertrain options as other Escalade models. The standard 6.2-liter V8 puts out 420 horsepower and 460 pound-feet of torque. An optional 3.0-liter diesel-fueled inline-six will offer 277 hp and 460 lb-ft while delivering improved fuel efficiency over its gasoline-powered sibling. Both engines will be mated with 10-speed automatic transmissions. The 2021 Escalade will go on sale in late 2020. We're not yet sure if the extended ESV will come at the same time or be added later, but we ought to know more by its debut in April. Related Video: