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Weekly Recap: New bosses try to jump-start Cadillac and Lincoln

Both of America's domestic luxury brands seem to be stuck in neutral.
It's ironic that Cadillac and Lincoln got new bosses within days of each other this month. It's also a commentary on the fact both of America's domestic luxury brands seem to be stuck in neutral.

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

Lincoln Aviator vs Cadillac XT6 | How they compare on paper

There have been big, three-row family crossovers for quite a while now, but until recently the luxury market hasn't fully embraced them. Sure, you could literally get one with a third row, but unless you were a kid, chances are the term "dungeon-like" was going to be tossed around. Things are changing now, however, as new and redesigned entries are starting to hit the market. We've recently had a chance to get our first drives of the 2020 Lincoln Aviator and 2020 Cadillac XT6, two all-new three-row crossovers from American luxury brands. We also got a turn behind the wheel of the updated 2020 Volvo XC90. However, since none of our editors have yet to drive to drive them all, we wanted to see how they compare on paper, examining their engine specs and interior dimensions. We also included the 2020 Acura MDX, the original three-row luxury crossover, which continues to sell well despite approaching the end of its current generation. That it offers a hybrid model makes it that much more applicable given the Aviator and XC90 also offer gasoline-electric powertrains, albeit of the plug-in variety. 3 Row Luxury Crossovers Powertrains View 1 Photos Non-hybrid MDX has a 5,000-pound max tow rating. How do their performance and fuel economy compare? This one is absolutely no contest. The 400-horsepower Lincoln blows away its competitors despite having a price tag that's similar to the 310-horsepower Cadillac and in between the XC90's T5 and T6 models. At least the Acura is considerably cheaper. Besides the eye-popping output, the estimated 0-60-mph time of 5.5 seconds (gleaned from the mechanically similar Ford Explorer ST) is appreciably quicker than the others. Now, fuel economy is a bit lower, but the efficiency of Volvo's four-cylinder engines are likely more susceptible to varying due to driver differences. It should also be noted that the Cadillac gets the same combined fuel economy estimate as the Aviator despite having 90 fewer horses and 144 fewer pound-feet of torque. Just one of the ways where the XT6's prospects dim in the presence of its cross-Michigan rival. The Cadillac is also not available as a hybrid model. The others are, but are disparate. The Lincoln Aviator Grand Touring and Volvo XC90 T8 are similar in concept: range-topping models that are as much about adding performance as they are fuel economy. Their hefty price tags certainly reflect that as well.