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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 president Johan de Nysschen expands on brand's future

Cadillac president Johan de Nysschen chatted with journalists at a recent roundtable, expounding on everything from domestic racing to Chinese manufacturing. The brand's been doing a slow burn on rolling out new products and increasing sales, but admittedly, there was a lot of work to do. After closing out last year 0.8 percent down in the U.S., the domestic luxury brand is more than 5 percent up so far this year, thanks to healthy double-digit bumps for the ATS and Escalade, and increased fleet sales. Globally, the brand's doing 21 percent better. The XT5 still outsells everything, though. Asked about slow sedan sales, de Nysschen cited a few reasons, one of them "energy prices," which are low enough to fuel the crossover craze. You can also read that as another admission that Cadillac doesn't have enough crossovers to please the crowds, a fact the XT4 will soon address. Yet de Nysschen also pegged the sedan malaise on "younger consumers who really are less tuned into dynamics and handling and all of those things that used to excite enthusiasts. It's more about the way cars complement and enable their lifestyle now." He topped that with a take on U.S. roads, saying, "I also have to say it may also be influenced a little bit by the decay of America's infrastructure. When roads no longer support high-performance sport sedans and ultra-low-profile rubber, people are going to respond to it." Those latter takes seem wide of the mark. Yes, BMW is the established leader, but the Munich carmaker sold 8,806 3 Series' so far this year in all variants, compared to 2,543 ATS coupes and sedans. Mercedes-Benz has sold 8,366 C-Class models so far in all variants. As for infrastructure, yes, it's a mess, but AMG sales rocketed up nearly 50 percent in the U.S. last year, nearly 10 percent of overall Mercedes sales, and the Three-Pointed Star expects that to rise again this year. People are buying sedans and performance models. They simply aren't buying enough of them with Cadillac badges. Cadillac has no plans to go racing in Europe since the brand doesn't have the kind of presence there to justify the investment. De Nysschen said they'll stick with the Daytona Prototype International formula in the U.S. domestic scene, and continue with the tech transfer from race to road.

Our favorite mid-engine Corvette theories and rumors

The mid-engine Corvette! We just saw blurry photos through the foliage, and are hearts are all aflutter because it means that this car is real. And it's the most " never before" Corvette since 1984. Which leads us to all kinds of wacky theories and speculation. Everybody knows something or heard from a guy. None of those guys (or gals) from GM are talking to Autoblog, to be clear. But that won't stop us from stirring the pot. Let's go over a few point-by-point. The pushrod engine will be replaced by an overhead-cam V8 Car and Driver has repeatedly reported that an overhead-cam engine will come after the mid-engine Corvette's debut with an old-school pushrod. We've heard the same thing firsthand, albeit from a source with no connection to the development of the Corvette or powertrain. "At some point two valves can't pass future emissions regulations," said the guy we know. While the pushrod engine is compact, the design makes it difficult - if not impossible - for sophisticated variable valve timing (and lift) systems that control combustion with more precision. Hasty conclusion: The pushrod engine has a finite life in front of it. This one's a lock, it's a just a matter of when. Bowling Green's new paint shop is really the mid-engine assembly line Credit to Reddit for this one. Like we said, everybody knows a guy. But let's look deeper. The new paint facility costs $439 million dollars and adds 450,000 square feet, almost half the size of the existing plant. Plus GM announced another $290 million in upgrades at Bowling Green Assembly. That sure sounds like a lot of money, but you can actually spend that much on a paint booth. Porsche spent 500 million Euros (about $561 million dollars) to add the Macan assembly to its Leipzig, Germany plant in 2014. Chrysler shelled out $850 million for a paint shop in Sterling Heights, Michigan. GM spent $600 million for a new paint shop at the Fairfax (Kansas City) plant. Honda, on the other hand, is working on a thrifty $210 million project in Marysville, Ohio that includes a 300,000 square foot expansion, and the low-volume Acura NSX facility only cost $70 million. Hasty conclusion: The square footage and cost could easily mean a new assembly line instead of (or in addition to) a paint line. And if the NSX plant was really that cheap, GM could have hidden a similar sum in its existing announcements.