2013 Chevrolet Suburban Ltz on 2040-cars

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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

Junkyard Gem: 2005 Chevrolet Aveo LS Sedan

The story of Daewoo in North America took some interesting plot turns over the decades. First we had the 1988-1993 Pontiac LeMans, a rebadged Daewoo LeMans. A bit later, Daewoo began selling cars under its own nameplate here, with the Lanos, Nubira, and Leganza available for the 1999-2002 model years. Then Daewoo fled the continent and left warranty service of those cars in the hands of Manny, Moe, and Jack. With GM taking over Daewoo Motors after Daewoo's bankruptcy, we got some Daewoos with Suzuki badges here— the Verona and the Reno— while Chevrolet began selling the South Korean-built Daewoo Kalos as the Aveo for the 2004 model year. This car may not be a gem in the sense that you would want to own one, but it's a gem of automotive history and thus deserves its place in this series (especially because it's one of the rare 5-speed cars sold here). Many (maybe even most) of these cars ended up in the hands of rental-car companies and other fleet users, but we can tell from the three-pedal setup that this car went to a non-fleet buyer. We've had a couple of these cars compete in the 24 Hours of Lemons, where I work as a dignified and respected race official, and they've been amazingly quick on a road course in the hands of good drivers. Power came from this 103-horsepower Opel-designed four displacing 1.6 liters. The Nubira and Lanos got versions of this engine on these shores, too. The LS was the top trim level for the Aveo in 2004, so this car got air conditioning and a halfway decent audio system (by 2004 standards). The seat fabric is industrial-grade stuff, which would have held up well under the steady drip and/or torrents of bodily fluids coating the interiors of rental cars. The 2004 Aveo LS started at $12,045, which comes to about $16,675 in 2020 dollars, so it was a lot of commuter-appliance for the price. The following generation of this car became the Chevrolet Sonic, beginning with the 2012 model year. You can still buy a new Sonic, and the inflation-adjusted price is nearly identical to that of the original AveoÂ… though you might want to move fast if you really want one, because Daewoo stopped selling the Kalos in South Korea not long ago. If you want the rarest member of the Aveo family available in North America, find yourself a hen's-teeth Pontiac G3, the short-lived Pontiac-badged version. Speaking of the G3, here's the way it broke the hearts of gas pumps around the world.

Fullsize GM SUVs have a problem that's making owners sick

Some fullsize SUV owners are getting sick, thanks to a buffeting and vibration problem in 2015 model year examples of the Chevy Tahoe and Suburban, Cadillac Escalade, and GMC Yukon. According to owners' complaints to the National Highway Traffic Safety Administration, the issue can vary from an annoying vibration inside the cabin to an experience so severe that it leads to dizziness and headaches. General Motors is aware of the complaints, but the fix isn't so simple. According to spokesperson Tom Wilkinson to Autoblog, the company "has been tracking this issue for a while." The problem has a fairly low incidence rate, but when it does occur the issue can be "uncomfortable and annoying for owners." There's no precise cause for the issue, Wilkinson claims, and in some cases, simply balancing the tires or changing the door seals can make it go away. However, not all of the fixes are so simple. AutoGuide dug deep into the problem and discovered a GM preliminary information bulletin that advised dealers to remove the headliner and to check the roof's bonds to the bows that go across the vehicle. However, that document included a note that the solution might not entirely eliminate things. According to AutoGuide, adding Dynamat insulation to the roof sometimes helped the problem. A GM spokesperson also told AutoGuide the company fixed the problem at the end of the 2015 model year, and didn't go into any more detail. This roof issue seems linked to some of the worst droning in these SUVs. According to one complaint from a 2015 Suburban owner to NHTSA: "Roof will not remain attached to the roof bows. This causes the buffeting similar to a window being down when all are up. The results span from annoying to painful." A 2015 Yukon owner claims to have another alleged cause for the problem in a NHTSA complaint from February 2015. This person brought their SUV to the dealer seven times over the course of four weeks for vibrations. The dealer replaced the driveshaft, suspension components, and more, but nothing worked. According to an engineer to the service adviser: "In an effort to prevent roll overs, they designed the frame and body mounts too stiff. There are 40 engineers working on issues, they have no solutions that work across the board." Wilkinson told Autoblog that GM is working with customers on an individual basis to rectify things. Since these are newer vehicles, dealers should also fix the problem under warranty.