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GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

No diesels in the running for 2016 Green Car Of The Year

It's a new era for the Green Car Of The Year. In the past, the theme of the award was to take a broad look at alternative powertrains and pick the best among them. "Clean diesels" from the Volkswagen group were often among the finalists and won the award twice. For the 2016 edition - which will be handed out at the LA Auto Show next month - not a single diesel made the list. There's little wonder why. Green Car Journal, which names the winner with a panel of experts, had to strip two VW brand vehicles of their past wins. The 2009 VW Jetta TDI, which won in 2008, and the 2010 Audi A3 TDI, which won in 2010, have both lost their titles now that the world knows about the "defeat devices" that VW installed in many of its TDI vehicles around the world. So, what does that leave us with for 2016? Two plug ins, a hybrid, and two gas vehicles. The two electric vehicle are the Audi A3 e-tron and the Chevy Volt, while the all-new Toyota Prius (which will come with a plug-in version later) is the lone pure hybrid. Rounding out the pack are two efficient gas models: the Hyundai Sonata and the Honda Civic. This is the tenth year for the Green Car Of The Year, and it will be interesting to see if diesels can come back into the award's good graces (for the record, no diesels were among the finalists in 2013, either) in the future. For now, we'd like to know who you think should win. You can read more about the finalists in the press release below and then cast your vote in our poll. Show full PR text FINALISTS ANNOUNCED FOR 2016 GREEN CAR OF THE YEAR Green Car Journal to Reveal Winner of 11th Annual Award at LA Auto Show Press & Trade Days, November 19 LOS ANGELES, CA (October 15, 2015) – Green Car Journal has announced its five finalists for the magazine's prestigious 2016 Green Car of the Year® award. The 2016 models include the Audi A3 e-tron, Chevrolet Volt, Honda Civic, Hyundai Sonata, and Toyota Prius. An increasing number of vehicle models are considered for the Green Car of the Year® program each year, a reflection of the auto industry's expanding efforts in offering new vehicles with higher efficiency and improved environmental impact. Green Car Journal has been honoring the most important "green" vehicles every year at the LA Auto Show, since its inaugural award announced at the show in 2005.

2014 Chevy Silverado, GMC Sierra full configurators truck in

You can now put prices to your wildest option-sheet dreams of the 2014 Chevrolet Silverado and GMC Sierra. A microsite for the full-size pickup truck twins has been up since January, and now the full-blown configurator is live and ready to take your virtual orders. The only two chassis configurations available at the moment are the Crew Cab with either a short or standard bed - Regular and Double Cab versions will come later. In Silverado flavors that will run you $32,710 for the short box, $33,010 for the standard box, while the Sierra adds a $1,500 premium to both of those prices, and destination and handling for both models adds another $995.
Since these are American pickups the list of modifications is lengthy, but we added $11,450 in just two steps by starting with the Silverado Crew Cab and standard bed, then checking four-wheel drive and the LTZ Z71 package. Our final truck, resplendent in Brownstone Metallic paint, heated and cooled Cocoa/Dune perforated leather seating and tasty details like chrome recovery hooks, and engine block heater and LED cargo box lighting, rang up $57,285 at the candy store.
They'll be on dealer lots sometime this summer, so now's a good time to start practicing your box-checking.