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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 Cadillac XT4 interior has actual buttons, no more touch-sensitive panel

Cadillac makes some highly stylish cars that are excellent to drive. In the realm of infotainment, there was room for improvement. The CUE infotainment system is infamous for being complex and annoying. One particular sore point was the touch-sensitive panels used for basic functions and their unrefined, "haptic feedback" clunk. Thankfully, spy photos show that Cadillac is changing tack both with buttons and infotainment controls in general. As seen above, there don't appear to be any capacitive buttons in sight. Instead, the XT4 has the "piano-key" buttons that are in vogue now. The most prominent are metal-finish buttons that control climate settings indicated by corresponding symbols above the buttons. Below that are additional buttons for seat controls and at least one safety feature, the parking warning. These should be vastly easier to manipulate than tapping and hoping you've engaged the correct function. This doesn't mean there won't be any touch-sensitive controls available, but they've at least been minimized. Other physical controls we spotted are down on the center console near the shifter. It looks as though the CT6's odd touchpad won't be making an appearance in the XT4 as there seems to be a more conventional knob instead. If it's indeed for the infotainment system, it would be a redundant controller as the upper screen's home button and fingerprints would indicate it's very much touch-operated. Like other Cadillacs and GM products in general, it's safe to say that Apple CarPlay and Android Auto will be available and possibly standard. There are a couple other interesting additions besides the physical controls. There's a Near Field Communications (NFC) logo embossed in the dashboard, indicating the car will support NFC pairing of phones. The XT4 also dispatches the more traditional mechanical shifter for a more modern monostable joystick like the found in some Buicks, but with a different shape. We're currently expecting the XT4 to be revealed late in 2018. It will be based on the Chevy Malibu platform, it'll probably stick with turbocharged four-cylinder power, and offer front- and all-wheel drive. Related Video: Featured Gallery 2019 Cadillac XT4 spy shots View 19 Photos Image Credit: Brian Williams Spy Photos Cadillac Technology Infotainment Crossover SUV Luxury cue cadillac xt4 cadillac cue

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