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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.

2016 Cadillac CTS-V arrives with 640 hp, 200-mph top speed

Ask the company's executive team, and they'll tell you "this is the maximum Cadillac V-Series." It's the 2016 CTS-V sedan, and it packs the very best of what's possible at Cadillac. And the company says it doesn't think "anyone thought it was possible that we could push [the CTS-V] this far." The big news is what's underhood: General Motors' supercharged, 6.2-liter LT4 V8, tuned to 640 horsepower and 630 pound-feet of torque. That's 10 hp and 20 lb-ft less than the monstrous Corvette Z06, and the result is the most powerful car Cadillac has ever produced. With rear-wheel drive, launch control and the eight-speed automatic transmission (sorry, folks – no more manual transmission here), Cadillac says the 2016 CTS-V will sprint to 60 miles per hour in just 3.7 seconds, on its way to a top speed of 200 miles per hour. Naturally, Cadillac's engineers say they have tuned the CTS-V to ensure it can put all that power to the ground with the most precision and poise possible. That starts with the excellent Magnetic Ride Control active damping system (with a claimed 40-percent increase in responsiveness)and a 25-percent increase in structural stiffness that should improve overall handling and steering. What's more, a high-performance Brembo brake package comes standard, as do 19-inch alloy wheels wrapped in seriously sticky Michelin Pilot Super Sport tires that will reportedly offer 1g in lateral acceleration. Cadillac also says that all changes to the bodywork are functional. That includes a carbon-fiber hood, front splitter, rear spoiler and diffuser that are super light and aid with aerodynamics and weight reduction – all of which will be available as an optional package for folks who like the exposed carbon look. Inside, it's more of what we're used to on lesser CTS models, but there's newly optional carbon fiber trim, microfiber suede upholstery trim, and some seriously awesome Recaro seats. Additionally, as we exclusively reported earlier, Cadillac will offer GM's Performance Data Recorder in the CTS-V. It records high-definition video with data overlays that's sharable via social media. Beyond that, Cadillac will offer the usual smattering of tech goodies, including Siri Eyes Free, OnStar with 4G LTE, CUE infotainment with navigation and Bose audio. The CTS-V will launch later next year, following the debut of the smaller ATS-V. In the meantime, the sedan will officially bow at the 2015 Detroit Auto Show in just a few weeks.