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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.

GM recalling nearly 4,000 vehicles over airbag concerns

Four different General Motors vehicles from the 2012 model year are being recalled over a potential airbag issue. The driver's side airbag shorting bar in the 2012 Buick Verano and 2012 Chevrolet Camaro, Cruze and Sonic might make contact with the airbag terminals, even during a crash. If so, the airbag won't deploy when it should, possibly increasing injury to the driver.
The recall is expected to begin on February 13 for the 3,896 units that might be affected. GM will notify owners who can then take their vehicles to dealers to have the airbag coil replaced. A bulletin from the National Highway Traffic Safety Administration below has more info.

Chevy rolls out Corvette Z06 C7.R Edition at SEMA

It's not just concept vehicles that Chevy is showcasing at SEMA this year. The Bowtie brand is also taking the occasion of the tuner expo to reveal the new Corvette Z06 C7.R Edition. The special edition of the flagship performance model pays tribute to the racing model with a series of special touches and upgrades. The C7.R edition is based on the Z06 in 3LZ trim, and comes equipped with the Z07 Performance Package, including Brembo carbon-ceramic brakes and Michelin Pilot Sport Cup 2 tires. But that's not the end of the story. It also includes special graphics, yellow brake calipers, yellow-striped black wheels, a carbon ground effects package, carbon hood section, metallic gray grilles and vents, and a black leather interior with sueded microfiber trim, Competition Sports seats, and yellow stitching. Buyers will be able to order theirs in black or yellow and in either coupe or convertible body-styles. Only 650 examples will be made, of which 500 will remain in the United States, and each of them is individually numbered starting with the VIN 700001. Of course, being based on the Z06 we already know, it packs a 6.2-liter supercharged V8 engine good for 650 horsepower and an equal measure of torque. With the Z06 pack, that translates to a 0-60 time of under 3 seconds for the automatic version and 3.2 for the manual. Related Video: Corvette Z06 C7.R Edition Pays Tribute to Racing Legacy Distinctive appearance package complements capability with special-edition style LAS VEGAS – When the Z06 rejoined the Corvette lineup in 2015 as the most capable model in the car's long, storied history, it also joined an elite fraternity of the world's most capable supercars – with performance proven on the track, including winning Car and Driver's 2015 Lightning Lap evaluation. The Corvette Z06's capability is derived in no small part from technology and experience leveraged from the championship Corvette Racing program. That connection is celebrated with the 2016 C7.R Edition. It's offered in Corvette Racing's signature yellow livery – or black – with coordinated exterior and interior accents. Only 650 will be built (500 for the U.S. market), all with the Z07 Performance Package with carbon ceramic brakes, and a specially serialized vehicle identification number.