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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

2016 Chevrolet Silverado 1500 Quick Spin [w/video]

The Silverado 1500 gets what most would consider an early update for 2016. Just two years into this generation, the half-ton Chevy truck has been given a visual overhaul and a handful of feature upgrades. Chevy reps say they didn't wait the usual three years for a refresh because they knew the domestic competitors were planning updates of their own for 2015. We're told the fast refresh was always in the plans, and that it wasn't a response to critics (like us) saying "meh" to the new truck's design, which some felt hewed too close to the GMT900s that came before. If a Ford grille that reaches halfway into the headlights is good, a Chevy grille that cuts the units clean in two must be better. That's at least how we imagine the designers' thought process went. Those new split lights use HID projectors on lower models and full-LED tech on the upper trims, with all versions getting LED daytime running lights. LED taillights are also included on the fancier models. <p>Your browser does not support iframes.</p> Each of the eight trim levels has its own look, and the differentiation goes beyond the placement of chrome and the color of cladding. Look closely and you'll see that elements of the various grille treatments are repeated within the headlights. It's a neat touch, and proof that attention to detail is still a thing. Chevy also reshaped the hood, with sharp lines and pockets that look like they'll do a great job of collecting snow come winter. We get why a Corvette has troughs in its hood (you know where the wheels are and see through the valley to the road) but the surfacing on the Silverado's engine hat has only aesthetic benefits. On the feature front, almost all 2016 Silverado models get standard Apple CarPlay and Android Auto support; the 7.0-inch screen includes both, while the available 8.0-inch screen will add Android Auto through an update in March of 2016. The top High Country trim gets new power-articulating side steps as an option. In addition to swinging down to help you hoist yourself in through the door, the steps have a button at the rear that, when pressed, motors them down and rearward to give you a foothold at the front of the bed. Chevy also catches up to the competition with an available remote-locking tailgate. Chevy also gets further into the competitive numbers game for 2016 with expanded use of its eight-speed truck transmission.

2020 Chevy Corvette Stingray vs the world: How it compares on paper

The 2020 Chevy Corvette Stingray in its base form offers an astonishing amount of performance for the money. In fact, so impressive is the car's spec sheet that the Corvette kind of exists in two different competitive sets: one of cars priced similarly, and another with cars of similar performance and reputation. To get a feel for how it handles each of these segments, we've compiled specifications for those two sets of players. You can find the first set below, which looks at cars of roughly the same price point. Following that is a bit of analysis, and then there's a chart of cars with similar performance and reputation. And that chart will also have some analysis. Though final pricing for the Corvette hasn't been announced yet, we know the Corvette will start at less than $60,000. And as far as pricing goes, its closest competitor is the Porsche 718 Cayman, which also starts at just under $60,000. Both are mid-engined and rear-drive, but the Corvette offers an extra 195 horsepower and 190 pound-feet of torque. The Cayman does boast a curb weight of right around 3,000 pounds, so it weighs a few hundred pounds less than the Corvette, but it's likely not enough to make up for the power deficit. The Corvette's sub-3.0-second 0-60 time bears this out against the Cayman's best 4.5-second run. Impressively, though, the Cayman has more cargo space than the Corvette in a package that's nearly 10 inches shorter. The Cayman also still offers a manual option for those that prefer self-shifting. The 2020 Toyota Supra is on the cheap end of this sports car class, just crossing $50,000. It also boasts more power than the Cayman, though it's still down by 160 ponies and 105 pound-feet of torque to the C8. It's also about as roomy as the Corvette, despite being about the same size as the Cayman. Cargo space is a bit tighter. Its driving characteristics will likely differ, too as the Supra sits on a front-engine platform. It might even feel closer to a C7 Corvette in some ways. The other mid-engine entry in this price range is the 2019 Alfa Romeo 4C Spider. Its small 1.7-liter turbo inline-4 only makes 237 horsepower and 258 pound-feet of torque, but it's also far and away the lightest of this group at 2,487 pounds. That's roughly 1,000 pounds lighter than the Corvette. It isn't as fast as the Corvette in a straight line, but that lightness surely pays dividends in cornering and braking.