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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

How Cadillac improved power output in 2016 ELR by 25 percent

Earlier this year, Cadillac announced that the 2016 ELR would come with a big price drop and a powertrain that packs 25 percent more power output. That's a lot more oomph, but it didn't sound like the Caddy engineers made any major changes to the engine or motors. So, what happened? Let's refresh our memories with the numeric details. The 2016 car is 1.5 seconds quicker to 60 miles per hour than the 2014 model (there was no 2015), down to 6.4 seconds. The 2014 put out 295 pound-feet of torque. For 2016, it will be 373 lb-ft. The specific breakdown of the various components in the powertrain has not been disclosed, but from what we can tell, the two electric motors and the 1.4-liter inline-four engine in the new ELR are not that much different than those in the old one. Sam Abuelsamid, senior research analyst at Navigant Research (and former writer here at Autoblog) said that any of the unspecified upgrades would be difficult to tell on a part-by-part basis, but the overall effect will be noticeable. "The changes to the ELR as I understand them are analogous to getting more performance out of a 1965 Mustang with the entry version of the 289 cubic-inch V8. You can replace the carburetor with a larger version that enables more air and fuel to flow into the engine, thus producing more power. The basic engine hasn't changed, but power capability is being unleashed by feeding it more." "Cadillac has changed components in the power electronics to enable more current flow into the motor and thus produce more torque. When you do this in the Mustang, you probably need to replace the rear axle gears and use a beefier clutch to transmit the power to the wheels. Similarly, the ELR probably has some upgraded clutches, bearings, and gears to withstand the increased total output." Cadillac spokesperson David Caldwell told AutoblogGreen in an email that the new ELR does indeed have more than just new lines of code. "One could not 'reflash' a previous ELR to get the performance of a 2016," Caldwell said. "If one only changed software you would not get the performance upgrade fully, as the 2016 creates higher current, more power. So these have been upgraded physically – hardware.

2020 Cadillac XT6 Review & Buying Guide | Sneaking in through the back

The 2020 Cadillac XT6 is arriving late to the party, literally decades after some of its rivals. It's a new, three-row luxury crossover that serves as a much-needed, more-modern and less ostentatious family hauler than the Escalade (which is getting overhauled next year, by the way). The question about the XT6, then, is it fashionably late? The XT6 is indeed quite handsome and refined -- we thought it looked particularly excellent in one our test car's Red Horizon Tintcoat. There's a classic sophistication to it that evokes Cadillacs of the 1960s rather than the overwrought and borderline-tacky designs of other eras (including recent ones). We think the exterior design will age quite well, especially in light of some competitors. However, we're also not sure it's distinctly a Cadillac. Worse, the interior is drab, unimaginative, and blighted with unremarkable materials. A Volvo XC90 and Lincoln Aviator instantly look and feel more special, while a range-topping Hyundai Palisade isn't as far behind as the price gap would indicate. The driving experience also leaves something to be desired. Besides the ho-hum engine, the XT6 has neither the sharp handling of Cadillac's recent sedans nor the stately ride comfort one also might expect given the brand's past. Overall, the XT6 sneaks in through the back of the party rather than making a grand entrance; an unremarkable effort in a toughly contested segment. What's new for 2020? The XT6 is an all-new model and fills a gap in Cadillac's lineup. What's the XT6's interior and in-car technology like? Answering this question is all about perspective. In a vacuum, the XT6 interior seems nicely put together, its leather is soft and features are in abundance. The range-topping trim's gold carbon fiber trim is particularly interesting. If you sat in one after a Buick Enclave, the step up would be obvious. However, come from a Lincoln Aviator or Volvo XC90, to cite two excellent examples of the breed, and the difference is stark in terms of design and materials quality (there are too many hard plastics throughout). The XT6 quite simply isn't as cool, isn't as luxurious and doesn't seem to justify its price tag. At least features content is strong with six USB ports, wireless charging, Android Auto, Apple CarPlay and satellite radio all included along with a panoramic sunroof and various driver assistance technologies. Other brands nickel-and-dime you with this sort of content.