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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.

Junkyard Gem: 1973 Cadillac Eldorado

The 1971-1978 Cadillac Eldorado was a gloriously ridiculous personal luxury coupe, packing a monstrous 500-cubic-inch V8 (that's 8.2 liters for you freedom-hating metric types) under its acre-sized hood for the first five years of production. Fuel economy was comfortably into single-digit territory, which meant you had to be a real high roller to be able to feed a new Eldo after OPEC turned off the oil spigot. I found this '73 in a Denver wrecking yard earlier this spring. View 18 Photos This car appears to have been sold new in Denver, and the extensive bodywork and sanded areas indicate that it was someone's project car prior to coming to the end of the line. The front-wheel-drive system used in the Cadillac Eldorados and Oldsmobile Toronados of this era was known as the Unified Powerplant Package, and it used a longitudinally-mounted engine feeding a chain-drive setup that proved to be amazingly sturdy and reliable. So sturdy, in fact, that it was used in gigantic front-wheel-drive GMC motorhomes. Everyone agrees that these cars are cool, but few are willing to rescue a rough example and take on the difficult and expensive job of a full restoration. This one isn't rusty, but that wasn't enough to save it. Related Video:

Cadillac CT6 will get high-res streaming video rearview mirror

Cadillac is preparing a big upgrade to the humble rearview mirror, adding a streaming video function that it claims will improve a driver's field of vision by 300 percent. The new system will debut on the 2016 CT6 flagship. The streaming system, which eliminates the visual obstructions caused by passengers, headrests and the rear pillars, relies on a 1280-by-240-pixel TFT display and a high-definition camera to reduce glare and improve visibility in low-light conditions. That camera even addresses one of the big annoyances of today's camera systems, by adding a hydrophobic coating to keep the camera lens clear. The system can easily be switched off at the press of a button, at which point the driver has a simple electrochromatic mirror at his disposal. "The closest comparison to this kind of rear vision would be driving a convertible with the top down," Travis Hester, the CT6's executive chief engineer said in a statement. "The streaming video is a significant enhancement for the luxury customer interested in purposeful technology." Scroll down for the press release from Cadillac. Cadillac Adds Streaming Video to Enhance Driver Vision and Safety Display eliminates visual obstructions, increases rearward vision by 300 percent 2014-12-18 DETROIT – Cadillac late next year will add high-resolution streaming video to the function of a traditional rearview mirror, removing obstructions of passengers, headrests and the vehicle's roof and rear pillars. The streaming video mirror improves field of vision by an estimated 300 percent, or roughly four times greater than a standard rearview mirror. "The closest comparison to this kind of rear vision would be driving a convertible with the top down," said Travis Hester, Cadillac CT6 executive chief engineer. "In addition to the increased field of view, the technology eliminates any rear seat, rear pillar or passenger obstructions, allowing the driver an unimpeded view of the lanes behind and traditional blind-spots," Hester said. Thanks to a high dynamic range, the camera's video feed reduces glare and allows a crisper image in low-light situations, versus a traditional glass electrochromatic, or auto-dimming, rearview mirror. The in-mirror display is an industry-leading 1280 by 240-pixel TFT-LCD display with 171 pixels per inch, combined with a HD camera designed specifically to enhance rear view lane width and maximize low-light situations.