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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 confirms Corvette Stingray Convertible for Geneva

Want proof that General Motors has increased global ambitions for its 2014 Chevrolet Corvette Stingray? It's staging the world premiere of the model's convertible variant at the Geneva Motor Show early next month.
As previously rumored, the droptop rendered above will debut at the Swiss show, making its first appearance anywhere on March 5. According to Susan Docherty, president and managing director of Chevrolet, the location makes sense because Corvette "...is an icon that has long been recognized and admired even in countries where it's never officially been offered."
While neither Chevrolet nor the Corvette has a major sales presence in Switzerland, the Bowtie's European headquarters is located in Zurich (about three hours to the northeast of Geneva) and GM has made it clear that it wants to build the Chevrolet brand up across Europe.

Chevy Volt gets customer satisfaction 'recall' for rear hatch issue *UPDATE*

Last week, General Motors has issued a "Customer Satisfaction program" for some 2011-2015 model year Chevrolet Volts to fix the manual rear lift gate not working as appropriate. According to Volt owner posts on Facebook, the problem manifests itself by the hatch not opening up all the way (sometimes worse in the cold) with some people bumping their heads. Dealers will replace the lift gate struts as part of the program. Some drivers were notified through the vehicle's OnStar system that there is a problem. GM has not yet said how many Volts are affected. *UPDATE* This program is for all 2011-2015 model year Volts. Chevrolet spokesperson Michelle Malcho told AutoblogGreen that, "This is not a recall, so there won't be any formal information posted on the GM website." The fixes will be free to affected Volt owners. Some 2010-2015 Cadillac SRX vehicles are also affected by the same problem and will also be fixed. Featured Gallery 2011 Chevrolet Volt: Review View 22 Photos News Source: General Motors via Transport Evolved Green Recalls Chevrolet Electric Hybrid customer satisfaction