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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 XT5 light refresh shown in China ahead of U.S. reveal

We spied the lightly refreshed 2020 Cadillac XT5 not too long ago, but now we have official photos via China. Cadillac decided to reveal the mid-cycle refresh of its crossover on that side of the world, so the vehicle you're looking at here is a China-spec XT5. While this may be the case, many of the details unmasked about the vehicle will likely be seen here, too. Cadillac told us it will be able to confirm U.S. specifics in the near future. You may be wondering, what's different? Truthfully, there isn't much to the mid-cycle update from a visual perspective. The grille has been swapped for one that better matches all the other grilles in Cadillac's newest crossovers like the XT4 and XT6. Cadillac of China didn't include any photos of the rear for this light reveal. There are significant updates in other places, though. At least in China, Cadillac is giving the XT5 its new 2.0-liter turbocharged four-cylinder engine we first saw in the XT4. That engine produces a refined 237 horsepower and 258 pound-feet of torque. We can't say whether the crossover will or won't keep the 3.6-liter V6 option in the states, but adding the boosted motor won't come as a surprise. Along for the ride is GM's nine-speed automatic transmission that is paired to that four-cylinder. The interior looks largely the same, save for the addition of Cadillac's rotary knob to control the infotainment system. This follows suit with other newly-released Cadillacs that allow you to control the system with both the knob and the touchscreen. Another notable interior upgrade is the addition of the rearview mirror camera. Cadillac is clearly set on integrating this technology onto every car it makes, and we certainly don't have any qualms with that. One bit of tech that wouldn't be included for China but may present itself for the U.S. model is Super Cruise. We've been told to expect the driver assistance system to spread throughout the manufacturer's lineup, and the XT5 seems a perfect candidate for the tech. Watch out for more details and photos coming soon for the 2020 XT5, as Cadillac will be sharing more specifics on the U.S. version in due time.

2020 Cadillac CT4 First Drive | Small shoes to fill

Following an existential crisis of fits, starts, headquarters moves and executive shakeups, Cadillac has itself a new luxury sedan, the CT4. It’s a convincing driverÂ’s car, less convincing as a luxury car, and seems a long shot to lure BMW, Audi or Mercedes owners into the Cadillac fold. For all the changes at Cadillac, that sure sounds familiar. The 2020 Cadillac CT4 is a redesigned ATS by another, equally unmemorable name. That includes an updated rear-drive chassis with eager, enthusiast-friendly tuning and 50/50 weight distribution – always among the ATSÂ’ top selling points. Styling is another winner, with crisp sheetmetal and CadillacÂ’s distinctive lighting signatures helping to differentiate this Yank from the international crowd. Cadillac is stretching so hard to cherry-pick the CT4Â’s competitors, it's possible they might slip a disc. We all remember the ATS as an able, rear-driven rival to the compact BMW 3 Series, Mercedes C-Class et al. But to paint the CT4 in a more competitive light – even as this sedan grows nearly 5 inches in length versus the ATS – Cadillac suddenly claims that its entry-level model, regardless of what it's now called, competes against subcompact, front-drive-based models like the BMW 2 Series Gran Coupe, Mercedes CLA-Class and Audi A3. Unfurling a tape measure reveals the truth: At a bit over 187 inches, the CT4 is actually longer than a 3 Series, C-Class, Audi A4 and every other major compact player. ItÂ’s a foot longer than an Audi A3. So, it's not a subcompact sedan, but there is one area where the CT4 does align with them – just not in a good way. The back seat is scrawny and hard-to-access, the result of its rear-wheel-drive platform and the sort of inefficient packaging that plagued the ATS. As such, it's better to think of the CT4, like the Genesis G70, as an affordable alternative to the roomier 3 Series, and other German compacts. And thereÂ’s nothing wrong with that. It starts at $33,990, undercutting the Germans by many thousands, and still boasts CadillacÂ’s greatest competitive strength: Smartly engineered ride-and-handling that matches up against the Euros with no excuses required. I drove the evident smart play in the CT4 lineup, the Premium Luxury 2.7 model, priced from $40,990, or $42,990 for the all-wheel-drive version I tested. (A Premium Luxury with the 237-horsepower 2.0T starts from $38,490, or $41,690 with AWD).