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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

2014 Chevrolet Corvette Stingray Convertible is a Swiss hit

We've just received an early peek at the 2014 Chevrolet Corvette Stingray Convertible here at the Geneva Motor Show. General Motors was kind enough to let us attend the final dress-rehearsal for its press conference scheduled for tomorrow's opening media day, and we've come away with a good look at the droptop C7 in person.
In the metal, the new Corvette Convertible seems somehow less avant-garde than the Coupe, even in Z51 Performance Package guise. That's not necessarily a bad thing - more of an observation. That initial impression may be because the C7's new greenhouse is one of its most prominent departures from Corvettes past. While we didn't get to see the top erected, there's no rear side window in the stock images that Chevy has already released, suggesting the C7 convertible's profile will look a lot like its C6 predecessor. And with the new power tonneau cover in place, there are also no rear ducts that come as part of the Z51 package (they've been moved under the car).
As with its predecessor, the tonneau is a handsome double-bubble piece, and the body-color "waterfall" element into the cabin between the seats has made it to the new model as well. Thus, the overall look with the top down should be a bit more familiar to prior-gen C6 owners - if you're one of those put off by the C7's new shape, you'll probably appreciate the convertible bodystyle more than the coupe.

The Tesla Model S was the best-selling EV of 2015

According to numbers crunched over at Hybrid Cars, the Tesla Model S was the best selling pure electric vehicle last year with 50,366 deliveries. These numbers might not tell the whole story, since Tesla reports deliveries made in 2015 that might have been sold in a different calendar year, while other makers are tallying sales. However, it's inarguable that the Model S ended up in more worldwide driveways than the second-place Nissan Leaf, which did about 43,000 sales. In the US alone, Leaf sales were down 42.8 percent year-on-year, from 30,200 in 2014 to 17,269 last year, and that decline also increased throughout the year. That marks a great finish to a great start to 2015, when Tesla took the lead in EV sales in the US for the first quarter. On top of that, as of last year the Model S becomes the second-best selling EV ever, with 107,148 deliveries since the middle of 2012. It trails the Nissan Leaf, with well over 200,000 worldwide sales. The Chevrolet Volt/Opel Ampera combo takes a close third, with about 106,000 sales. The Nissan and Chevy rivals both launched at the end of 2010, a 16-month head start on the Tesla. Down the charts, the Mitsubishi Outlander PHEV which continues to be forbidden fruit for our market notched 39,000 sales. The BYD Qin PHEV sold 31,898 examples in China, and BYD would take the overall victory from Tesla with 58,728 deliveries if you counted all of its EV and PHEV production, such as its electric buses. The BMW i3 nabbed fourth place with 24,057 global sales. In 2011 the Munich automaker said it wanted to sell 30,000 i3s annually by 2014, but by the time the car launched the company considered 15,000 annual sales 'great for now,' so the 2015 number seems a fine place to wind up. Related Video: News Source: Hybrid Cars Green BMW Chevrolet Mitsubishi Nissan Tesla