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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

Chevy Corvette Stingray picks up another award, this time from Automobile

The new Chevrolet Corvette Stingray has picked up another buff book accolade after capturing Road and Track's Performance Car of the Year award. The seventh-generation of America's sports car (sorry Viper, Mustang, et al.) has been named Automobile Magazine's Automobile of the Year.
Automobile's award to the Corvette over competitors is the mirror image of its rival Motor Trend, which named the Cadillac CTS its car of the year over the C7. The CTS was, according to the Automobile team, the closest contender to the mighty Stingray. Great news all around for General Motors it seems.
As for what pushed the Corvette past its distant, four-door cousin, Automobile commended its excellent, 6.2-liter V8 calling the car's performance "simply awesome" while also remarking that it is easier to drive fast than ever before thanks to steering and chassis tweaks. Following a theme set by other publications, there were also plaudits for the interior, of all things, with the buff book complimenting the car's ergonomics and material quality, while also praising the standard seats.

Chevy to show redesigned Captiva in Geneva, will it come to US rental lots?

Unless you're renting a car or driving through Orlando, Florida (the rental car capital of the US), you'll probably never see a Chevrolet Captiva - the rebadged, fleet-only version of the old Saturn Vue - on our roads, but this crossover is popular in many other parts of the world. As such, Chevrolet announced that the Captiva will be getting an update for 2013, which will be unveiled next week at the Geneva Motor Show.
Coming off a pretty extensive refresh in 2011, the 2013 model year will bring even more changes to the Captiva like LED taillights, new 18-inch wheels and revised fascias with a new grille and fog lights up front and inset chrome exhaust outlets at the rear. New interior features include heated rear seats, dual-zone climate control as well as available options on some of the upper trim levels such as leather seating and keyless entry and start. We have yet to hear back from Chevrolet as to whether or not the updated Captiva will be making its way to a rental lot near you, as the model is only available in the US to fleet buyers.
Alongside the updated Captiva, Chevy is also showing off its new Trax in Europe, where the subcompact crossover will go on sale this spring. GM's press release for these two Geneva-bound models is posted below.