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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

2019 Lincoln Nautilus vs 2018 Cadillac XT5: How they compare on paper

There will no doubt be endless ads touting the "first-ever" 2019 Lincoln Nautilus, which is accurate, but it's really just a mid-cycle update of an existing midsize luxury SUV attached to a greatly welcomed name change. Frankly, Lincoln could've called it the Diamond Jubilee Bill Blass and it would've been an improvement. Whatever. The MKX is dead. Long live the Nautilus. Now, speaking of SUVs with silly alphanumeric names, the 2018 Cadillac XT5 lines up remarkably well with the 2018 MKX. Besides hailing from American luxury brands, they have virtually identical exterior dimensions and similar standard engines as well. Cross-shopping seems assured. But what does the change to the 2019 Nautilus mean for how it compares to the XT5? Cosmetic changes might tweak exterior dimensions by a tenth of an inch here or there, but the interior should remain the same. The Nautilus gets a new engine, though, so check out our spreadsheet below to see if America's (and Canada's) luxury SUVs still stack up. Conclusions The switch to a turbocharged four-cylinder base engine means the XT5 and MKX/Nautilus are no longer on equal terms under the hood. While the Cadillac now has a considerable power advantage, the Lincoln Nautilus could save you hundreds every year based on its likely fuel economy (the 2.0-liter turbo engine, albeit with a different transmission, is in the mechanically similar Ford Edge). Besides the new engine for 2019, the Nautilus also gains an eight-speed automatic and an automatic stop start system. Both of those elements are already included on the XT5. It was announced that the 2019 Nautilus will start at $41,335, which compares to the base MKX at $39,960 and the 2018 Cadillac XT5 at $41,590. In other words, the Lincoln is still less expensive, but just barely. Standard feature content is also comparable, especially as the Nautilus gains standard Apple CarPlay and Android Auto, which are already standard on the XT5. So really, no matter what they're called, the Cadillac and Lincoln should continue to be neck-and-neck competitors. 2019 Lincoln Nautilus Photos View 20 Photos 2018 Cadillac XT5 Photos View 28 Photos 2018 Lincoln MKX Photos View 57 Photos Related Video: Cadillac Lincoln Car Buying Crossover SUV Luxury Comparison consumer cadillac xt5 lincoln nautilus

GM issues four new recalls, 2.4 million cars affected

General Motors has announced another set of recalls, covering some 2.42 million cars in the United States. For those keeping track, The General has now recalled over 15 million cars worldwide this year due to various issues.
Here's the breakdown for this most recent set of recalls:
1,339,355 - Buick Enclave, Chevrolet Traverse, GMC Acadia models from the 2009 to 2014 model years; Saturn Outlook models from the 2009 to 2010 model years