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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.

2021 Cadillac CT5 adorned with Diamond Sky Special Edition Package

Among the changes due to appear on the 2021 Cadillac CT5 will be an exclusive Diamond Sky Special Edition Package. We don't have photos of the design theme yet, but Cadillac Society reports that the heaven-hued composition will only be available on the Premium Luxury trim. It starts with Diamond Sky Metallic paint that could provide perfect contrast for the Dark Sky Metallic offered on the GMC Sierra 1500. The CT5 goes all-in with the exterior color, dressing the rocker moldings and rear diffuser in Diamond Sky Metallic, and sitting on 19-inch wheels with a Diamond Cut/Midnight Silver finish. Tucked behind the wheels, buyers will find blue Brembo V Performance brake calipers. And having decided that standard taillamps will detract from the effect, for the first time on a non-V and non-V Sport Cadillac, the special edition CT5 will get clear taillights with a gray-tinted outer lens. The interior fabric comes in Sky Cool Gray with a Diamond Fall seat perforation pattern, offset with Jet Black accents, Galaxy Wood trim, and alloy pedals.  In typical Cadillac fashion, getting the Diamond Sky Special Edition Package will necessitate ordering another package when ordering opens next year. The required Climate Package bundles heated and ventilated driver and front passenger seats and an automatic heated steering wheel, and costs $1,090 in 2020. Elsewhere for the CT5 and the CT4, the next model year delivers a 12-inch customizable digital gauge cluster, plus the option of Super Cruise. Some of the changes already outlined for the 2021 CT5-V are likely headed to the CT5, so in the case of Super Cruise, for instance, checking that option could get real pricey, requiring the $1,300 Driver Awareness Plus Package as well as either the $8,330 Platinum Package or $1,950 Driver Assist Package.  Related Video:    

GM recalling 54k Cadillac SRX, HD pickup models

There are more recalls to report General Motors, but these latest actions pertain to newer examples of the Cadillac SRX, Chevrolet Silverado HD and GMC Sierra HD. With so much scrutiny on the company's recall strategy, GM is under increasing pressure to call in defective models more quickly, and it appears to be doing so here.
Here in the US, the automaker is recalling 50,571 Cadillac SRX crossovers from the 2013 model year fitted with the 3.6-liter V6 because the transmission control module programming can cause a three- or four-second lag in acceleration at low speeds. The explanation filed with the National Highway Traffic Safety Administration states, "if the following sequence occurs within two seconds: during an upshift from first to second gear (8-10 mph), the driver then brakes the vehicle to less than 5 mph, and then accelerates again," the delay can occur. According to Automotive News, the recall effects 56,400 vehicles worldwide, and the company is not aware of any crashes caused by the problem. The fix consists of a transmission control module (TCM) reflash.
In a separate recall, GM is repairing 51 Chevrolet Silverado HD and GMC Sierra HD pickups from the 2015 model year in the US. In vehicles with diesel engines and dual fuel tanks, the nuts that connect the fuel pipe to each side of the transfer pump between the tanks may be improperly torqued, which could cause a fuel leak. Obviously, this could be a fire hazard. The remedy is simply tightening the hardware. According to GM spokesperson Alan Adler, there have been no fires actually caused by the potential leak. "Only 21 of the trucks are in customer possession and they can be fixed anytime because there are no parts involved. The others are being fixed at dealerships," Adler said in an email to Autoblog.