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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

2015 Chevrolet Silverado Custom glitzes up volume model [UPDATE]

UPDATE: The original prices listed in Chevrolet's press release did include destination charging, despite not being specifically called out as such. We've edited the story to reflect this. The Chicago Auto Show's reputation as the home of special edition debuts grows stronger today, as Chevrolet is complementing the news that it'd unveil the Silverado Midnight Edtion and Colorado GearOn special editions in the Windy City with the debut of the Silverado Custom. And yes, it's different than the higher-spec Custom Sport that debuted just last month in Detroit. What's so custom about the Silverado Custom, you ask? Well, not a whole lot. The new truck is based on the popular Silverado LS Double Cab, and adds, among its most noteworthy features, a set of 20-inch, five-spoke wheels. From there, chrome is the order of the day, with shinier front and rear bumpers, mirror caps and door handles. The top portion of the front bumper, which is finished in black plastic on the standard LS, is matched to the body color on the Custom model. Standard LS interior features, like the 4.2-inch MyLink system with 4G LTE wireless internet, 40/20/40 cloth front seats, remain in place on the Custom, while it's a similar story with the powertrain. Choices below the sheetmetal will force buyers to choose between a 5.3-liter V8 or a standard 4.3-liter V6, and two- or four-wheel drive. Chevy is pricing a V8-equipped Silverado Custom 4x2 at $33,820 (including $1,195 in destination charges). Adding four-wheel drive brings the price up at $37,800, although as we said, selecting the 4.3-liter V6 will yield a more affordable Custom. Check out the full press release on the newest member of the Silverado clan, available below. 2015 Silverado Custom: Back to Basics, with Style $33,820 starting price for a well-equipped double-cab V-8 CHICAGO – Chevrolet takes aim at the heart of the pickup market with the Silverado Custom, which offers Chevy Truck capability and dependability in a stylish package, priced within reach of many truck customers. "The economic recovery has led to booming sales of high-end pickups like the Silverado High Country," said Sandor Piszar, marketing director for Chevy Trucks. "But there are also millions of customers in the heart of the market who want a great looking, well-equipped truck at an affordable price.

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.