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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.

GM considering new powertrain options for large SUVs

Aside from the new General Motors offerings, there's not a whole lot of action going on in the fullsize SUV segment. That doesn't seem to be stopping GM from pushing the envelope in the market as Automotive News is reporting that the automaker is looking to introduce some new powertrain options into the Chevy Tahoe (and Suburban), GMC Yukon (and Yukon XL) and the Cadillac Escalade - all have been redesigned for the 2015 model year.
Now, we already know that GM and Ford are collaborating on nine- and ten-speed transmissions for a broad range of applications (including the big SUVs), but this new report says that GM is also considering other options as a way to one-up the competition and, of course, to optimize fuel economy. AN quotes Jeff Luke, executive chief engineer for GM trucks, as saying that "interesting powertrain technologies" are coming including a return of a hybrid SUV and possibly even a diesel engine. Although it sounds like the latter could come down to how customers respond to the 2014 Jeep Grand Cherokee EcoDiesel.

Meet the next president's new Beast, a giant bomb-proof limo

We don't know who will be our president in 2017, but now we have a better idea of how that person will be transported on land. The next presidential limo, officially referred to as the presidential state car, will be another Cadillac. And a big one. You're looking at a lone spy photo of a car that will be of high interest to actual spies – not to mention Secret Service agents and lots of law-enforcement types. President Obama has been riding around in a Cadillac nicknamed The Beast for a while now. (It recently made an appearance on Comedians in Cars Getting Coffee.) Over the Secret Service radios, it goes by Cadillac One and Limo One. While the current car looks like a stretched Cadillac DTS sedan, it's actually kind of huge and built on a Chevrolet Kodiak medium-duty truck chassis. The same is likely to be true again, but this one will look a lot more like the latest Cadillac models. Through the camo we can see a front end reminiscent of the new CT6 large sedan. Imagine one of those scaled to about 5/3 of the production car and you've got the right idea. Fun fact: It will be the first presidential limo to feature Caddy's new wreathless crest logo on its grille. View 6 Photos As for features, we're in the dark and will remain so even after the new president-mover goes into service. The details are a legitimate matter of national security, but you can bet it's bulletproof, can withstand small bombs, and has some kind of onboard secondary air supply in case of a chemical or biomedical warfare attack. Oh, and it has that big red phone in back in the event things get really bad. The new one will no doubt carry the latest communications and safety technology. The new presidential limousine has been in the works for some time. The government sent out a request for proposals in 2013, and this model is expected to go into service sometime in 2017. Chances are it will make its debut at the inauguration of [INSERT CONTROVERSIAL NAME HERE] in about a year's time. Related Video: