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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.

Cadillac back on track with 600-hp ATS-V.R racer in FIA GT3 spec [w/video]

There was already a rumor brewing that Cadillac might eschew the CTS as its racecar next season in favor of the ATS Coupe. It turns out that is absolutely the case, and now we know just what this 600-horsepower, future racer looks like. The coupe might not be limited to competing in just the US, though, because it's built to FIA GT3-specifications, meaning that this Caddy is also eligible to race in over 30 series worldwide against the likes of Bentley, McLaren, Audi and other premium brands.
The heart of this massively winged Cadillac is an engine dubbed the LF4.R. It's based around the unit in the production ATS-V and CTS Vsport but with larger turbos, bigger intercoolers, side exhausts and other tricks. Cadillac claims it makes a monstrous 600 hp and 520 pound-feet of torque in unrestricted form.
As the photo above shows, the ATS-V.R also wears an aggressive aero kit with a carbon fiber front splitter, and a wing at the back that could probably double as a picnic table in a pinch. The dry weight of the whole package is quoted at about 2,900 pounds, which is around 700 pounds less than the street version.

2019 Lincoln Nautilus vs 2018 Cadillac XT5: How they compare on paper

There will no doubt be endless ads touting the "first-ever" 2019 Lincoln Nautilus, which is accurate, but it's really just a mid-cycle update of an existing midsize luxury SUV attached to a greatly welcomed name change. Frankly, Lincoln could've called it the Diamond Jubilee Bill Blass and it would've been an improvement. Whatever. The MKX is dead. Long live the Nautilus. Now, speaking of SUVs with silly alphanumeric names, the 2018 Cadillac XT5 lines up remarkably well with the 2018 MKX. Besides hailing from American luxury brands, they have virtually identical exterior dimensions and similar standard engines as well. Cross-shopping seems assured. But what does the change to the 2019 Nautilus mean for how it compares to the XT5? Cosmetic changes might tweak exterior dimensions by a tenth of an inch here or there, but the interior should remain the same. The Nautilus gets a new engine, though, so check out our spreadsheet below to see if America's (and Canada's) luxury SUVs still stack up. Conclusions The switch to a turbocharged four-cylinder base engine means the XT5 and MKX/Nautilus are no longer on equal terms under the hood. While the Cadillac now has a considerable power advantage, the Lincoln Nautilus could save you hundreds every year based on its likely fuel economy (the 2.0-liter turbo engine, albeit with a different transmission, is in the mechanically similar Ford Edge). Besides the new engine for 2019, the Nautilus also gains an eight-speed automatic and an automatic stop start system. Both of those elements are already included on the XT5. It was announced that the 2019 Nautilus will start at $41,335, which compares to the base MKX at $39,960 and the 2018 Cadillac XT5 at $41,590. In other words, the Lincoln is still less expensive, but just barely. Standard feature content is also comparable, especially as the Nautilus gains standard Apple CarPlay and Android Auto, which are already standard on the XT5. So really, no matter what they're called, the Cadillac and Lincoln should continue to be neck-and-neck competitors. 2019 Lincoln Nautilus Photos View 20 Photos 2018 Cadillac XT5 Photos View 28 Photos 2018 Lincoln MKX Photos View 57 Photos Related Video: Cadillac Lincoln Car Buying Crossover SUV Luxury Comparison consumer cadillac xt5 lincoln nautilus