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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 XT3 caught covered in copious camouflage

While a bit difficult to tell thanks to the impressive camouflage used, what we're looking at here is likely the upcoming Cadillac XT3. There are a few details that stand out to lend credence to this prediction. There are a handful of sharp angles scattered throughout that are in line with Cadillac's modern design language. Specifically in the LED running lights and on the side mirrors. The rear profile also is reminiscent of the current, and slightly larger XT5. The rear lights extend into the D-pillars, which would match the current Escalade. We get a pretty clear picture of the rear suspension on this XT3. It's clearly an independent rear suspension using coil springs. While General Motors uses independent suspension on some of its crossovers, we can't quite match it to a particular model. We believe that if the XT3 is based on an existing model (which it almost certainly is), the platform and suspension have been substantially modified. The XT3 could use a version of the D2XX platform that underpins the Buick Envision. However, we know from a previous report that the XT3 will likely be built at the factory that produces the Buick LaCrosse and Chevy Malibu. The XT5 uses a modified version of the LaCrosse/Malibu platform, so it's possible the XT3 could use a shorter version of the XT5 chassis. Depending on how small the XT3 ends up being, it might even share a platform with the Chevy Trax and Buick Encore. However, considering their economy car roots and torsion-bar rear suspension, we think that's the least likely. Regardless of what chassis is underneath its crisp bodywork, we expect the XT3 to be released sometime next year. Related Video:

GM recalls 55,000 trucks, SUVs for separating axles, fuel pump failures

General Motors issued four separate recalls covering eight of its truck and SUV models for issues related to fuel pump and half-shaft failure. In total, the four campaigns include more than 55,000 vehicles spread out over three brands and six model years, but they've sorted themselves neatly into two categories. Let's dive in.  Axle separation Four models are being recalled for potential axle separation: The 2023 Cadillac XT5, 2023 GMC Acadia, 2023 Chevy Blazer and 2023 Chevy Traverse. The number of units affected is incredibly small (10 units each times two recalls, for a total potential population of just 20 cars). In each case, a small number left the factory with half-shaft assemblies that may have been missing the retention rings that keep them in place, possibly allowing the axles to separate or eject from the transmission. In the case of the XT5 and Acadia, it's the right-side axle assembly; Chevy dealers, however, will have to check the left side.  Fuel pump failure Again, we have multiple vehicles being recalled for similar issues, but in this case they're a bit more distinct. The first of these recalls covers the 2021-2022 Chevy Equinox and 2022 GMC Terrain. GM says a supplier-initiated change may have led to fuel pumps shipping with inadequate clearances to allow for the prescribed flow of fuel, meaning the pump could starve the engine. Customers experiencing the issue may see a check engine light and experience engine hesitation. In some cases, the cars may not start at all. Chevy and GMC will replace the units in question with correctly specified pumps.  The second recall covers a fairly specific cross-section of GM's HD truck lines. 2017-2019 Silverado and Sierra HD trucks sold with the diesel engine and a dual-tank configuration may have shipped with a rear fuel pump that is susceptible to fouling by debris, preventing fuel from properly transferring to the front tank, or, in extreme cases, resulting in a collapse of the rear tank. This issue can lead to inaccurate/erratic fuel tank readings, engine hesitation, a check-engine light or failure to start.  In both cases, GM will inspect and replace faulty units free of charge for customers. Expect notifications to be delivered by March.  Related video: Recalls Cadillac Chevrolet GMC Ownership Safety Truck SUV