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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.

Next Cadillac Escalade's interior spied for the first time

Update: Now that new spy photos of another large GM SUV have surfaced, we believe these shots show us a GMC Yukon interior, not a Cadillac Escalade. You can see the new spy shots here that depict a much more upscale vehicle interior compared to the fuzzy center stack shown in the shots of the Yukon. The new Cadillac Escalade has a lot of work to do in order to properly compete with Lincoln's wonderfully luxurious Navigator. These interior spy photos are our first look at what Cadillac is working with on the inside of its new luxury truck. We won't make final judgements, as this vehicle is still a prototype and subject to change. However, a few key bits are noticeable from the fuzzy photos. As expected, Cadillac's CUE infotainment and center stack is nowhere to be seen. Replacing it is a new interior design language, with a tablet-like screen that seems to rise out of the sloped stack on top. Below the screen is a strip of stitched leather and a couple prominently placed air vents. To the left of this area is what appears to be a push-button gear shifting system, replacing the column-mounted shifter currently in use. Below all that on a lower level of the center stack are all the climate controls, along with what look like physical buttons for what could be audio-related controls. Does it look as luxurious as the Lincoln? Not with all the coverings and shrouding it doesn't, which means we'll have to wait until we get the full picture. One thing that's clear is that the interior design is definitely going to be wildly different than the current Escalade. That center stack flows downward as one sloping piece into the high and bulky center console area. This design looks like it brings the center console further downward, and also uses a multi-tiered look. It's tough to read what's on the screen, but the software looks like the same stuff we got a preview of on the new Cadillac CT5 and CT4 sedans. As for the exterior shots, there's almost nothing that we haven't already gotten a taste of in previous spy photos. The independent rear suspension is a go, as are what appear to be massive headlight and LED DRL fixtures. If you look through the wrapping, you can make out how far up and down the lighting fixtures stretch ... or perhaps they're separate units altogether. It's tough to tell at this point.

Cadillac CT6 to get twin-turbo V8

Say what you will about his decisions at Infiniti and now Cadillac, but Cadillac CEO Johan de Nysschen knows how to deliver a compelling interview. During an online Q&A session with Jalopnik readers, de Nysschen offered substantial hints at what's coming for the brand. By dropping coordinates on the brand's star chart, in reading the entire thing and connecting the dots you can see a Cadillac that is much grander than the one we know now. The CT6 that got revealed during the Oscars telecast? Answering the question of whether it would have the performance to compete with a Mercedes S550 or BMW 750, de Nysschen said the big sedan's "lightweight body structure allows us to achieve formidable performance even with a twin-turbo V6. Imagine how this car would perform with a twin-turbo V8." In clarifying a subsequent question that also dealt with how the CT6 would compare to German rivals, he wrote that the CT6 would have "a very wide mix of engines, starting with a two-liter turbo, up to, eventually, a high-performance advanced V8 turbo." Patience and the future and the word "eventually" were heavy themes. The brand will embrace diesel engines as well, de Nysschen writing, "We will have four-cylinder and six-cylinder diesel engines, but not before 2019." As to the return of something like the XLR, which was Corvette muscle underneath a Cadillac body, he wrote, "I think in the fullness of time, we will get around to developing a high-performance, very-emotive sports car as a halo for the Cadillac brand. But we have so many projects to occupy us through 2020 that this will have to wait a little while." And on the design language across model lines, which enthusiast Cassandras have warned is too similar (as if that hasn't worked out for the Germans), he wrote that it is "undergoing gradual evolution and you will notice stunning new designs in future models, which remain unmistakably Cadillac and reflect our DNA but which take our sophisticated Art and Science design to a new level." But of course he would say that, which is what brings us back to patience and the future and eventually, when we'll see what this all really means. It all reads well enough, and we'd love to see it happen. One thing we won't see are the ducks that once adorned the Cadillac crest; when a reader asked if he could have them back, de Nysschen said, "No, you can't have them back. I play with them each night in my bath." Head over to Jalopnik for the full read. It's worth it.