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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

Cadillac's de Nysschen won't budge on raised pricing

According to new Cadillac boss Johan de Nysschen, it will take between 10 and 15 years to elevate GM's top brand, which was once hailed as "The Standard Of The World," back to prominence in the minds of American customers. And to hear the executive talk of it, the brand is going to have to be willing to see sales falter in the near-term before they recover:
"Either you have to bring your volume aspirations into alignment with reality and accept that you will sell fewer cars... Or you have to drop the price and continue to transact at the prices where you were historically... I think the logical conclusion is that it's better to build off a very solid base in terms of [product] credibility, charge a fair price for the car and realize you have to wait until the volume comes."
In other words, sales will fall before they rise, and the brand has to be okay with that. Notice, too, that de Nysschen speaks of "a fair price" for Cadillac cars and utility vehicles. In this case, "fair" means more than many of the brand's traditional buyers are accustomed to, and roughly in line with the brands and machines Cadillac believes it is competing against. For instance, the newly enlarged 2014 CTS carries a suggested retail price that is over $6,000 higher than it was in 2013, and some trim levels boast an even higher price premium over the models they replace.

2018 Cadillac CT6 Drivers' Notes | Super Cruiser

The 2018 Cadillac CT6 showcases General Motors' impressive Super Cruise feature. It's the next milestone on the way to an autonomous future, though GM is being conservative about promoting Super Cruise's considerable prowess. It helps the driver, GM says. Does it work? Our editors have been testing one this week as the calendar turns and the temperatures drop in Michigan. Also, the CT6 is a really nice car. Here's what we think. Senior Editor, Green, John Beltz Snyder: Super Cruise, man. On Wednesday night, I rode home in a 2018 Cadillac CT6 with Super Cruise. I say "rode," but I was sitting in the driver's seat. I spent more time with my hands off the steering wheel than on it. It was super relaxing. Once I got on the highway, I set the cruise control, waited for the steering wheel icon to show up on the instrument cluster, and hit the button on the steering wheel that looked like a steering wheel (pretty meta, to be honest). The top section of the wheel illuminated in a green arc, and I felt the weight of the steering lift as the car began driving itself. I put my feet flat on the floor, rested my hands on my knees, and just watched the road while listening to a podcast ("The Dollop," if you were wondering). To be honest, I had trouble concentrating on the audio, as my thoughts were captivated by the way the car managed the road and traffic around me. Sure, I had to change lanes on my own and take over steering on interchanges and surface streets, but when the AI took the reins, it had my complete confidence. Perhaps just as surprising, the CT6 was also a blast to drive manually. It felt super smooth, with plenty of power and poise. I enjoyed bending it through 50-mph curves almost as much as I enjoyed being driven. Almost. Editor-in-Chief Greg Migliore: Super Cruise just works. I was blown away how easy it was to use and how well it just did what it was supposed to do. Merging into the teeth of rush hour traffic in metro Detroit, I braced for the worst. I figured I'd be stuck in bumper-to-bumper gridlock and Super Cruise would never get deployed. Frankly, I was cynical Super Cruise would work. But then I was able to hit the 70-mph speed limit and figured, well, let's just see about this thing. Like John, I did the two-steps to set up SC, and boom, it worked. It trailed the cars in front of me at a proper distance. It braked naturally to a stop and then resumed speed. It slowed down when a Jeep Grand Cherokee cut me off.