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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 CT6 PHEV battery shape a big departure for GM's plug-in hybrid tech

Anyone with any familiarity with the electric powertrain details for the two General Motors plug-in hybrids will have noticed that the information we have about the newly announced Cadillac CT6 plug-in hybrid has a lot of numbers in common with the Chevy Volt and the Cadillac ELR, like the 18.4-kWh lithium-ion battery pack and an expected all-electric range of 37 miles. We also noticed that the announcement calls the plug-in CT6 hybrid an actual plug-in hybrid and not an "extended range electric vehicle (EREV)," which is what GM calls the Volt and the ELR. This, of course, means we needed to ask GM some questions. Donny Nordlicht from Cadillac communications told AutoblogGreen that while the Volt and CT6 batteries are both 18.4-kWh, the shape is completely different. In the Volt/ELR, the battery is T-shaped (see it here). The CT6 has four seats, with a tunnel running between the two in the rear, as you can see here, but the battery in the CT6 PHEV is "a cube-shaped pack, which is between rear seats and the trunk," Nordlicht said. "There is no pass through." GM has not yet released any technical schematics about this pack, but Nordlicht said that, "The CT6's advanced mixed-material platform was designed to accommodate the PHEV system by design so that it minimally intrudes on the cabin space." It also means that the CT6 can be ordered as an optional PHEV, while the Volt and ELR were purpose-built plug-ins. GM is also distinguishing between the EREV and PHEV powertrains in its vehicles from this point forward. "We are not discarding the EREV language," Nordlicht said. "The CT6 utilizes a two-motor system mated to a 2.0T 4-cylinder engine, which is an all-new system to Cadillac." We assume that the PHEV packs will use li-ion cells from LG Chem, just like the EREVs do, but Nordlicht did not answer our question on that point. As for other details about the CT6 PHEV – like production, full dimension, and pricing – we will just have to wait until closer to when the vehicle launches for those. Related Video:

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.