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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

GM says EVs are the future — but trucks are going to take it there

In the PowerPoint deck for the General Motors Capital Markets Day presentation, one of the more disturbing things comes early on, during GM President Mark Reuss' initial remarks, in an area where he is discussing the company's overall strength in trucks. The point being made is that GM has a truck for all and sundry. And there it is, a phrase on a slide that should send chills up the spines of those who still pine for the old Bob Seger "Like a Rock" Silverado ads: "Little bit country. Little bit rock 'n' roll." That's right. Donny and Marie. Somehow the Denis Leary snark in the F-150 ads is all the more appealing. The Capital Markets Day presentation was chock full of observations about electrification and automation (Reuss and CEO Mary Barra both noted that the corporation's vision is one of "Zero Crashes. Zero Emissions. Zero Congestion." Dan Ammann talked about the progress being made at Cruise Automation; Reuss rolled out the plan for an array of electrified vehicles, with a luxury EV and a compact SUV being the "Centroid Entries" for the modular bases of many others). But it is worth noting that there is no getting away from the power of pickups in the U.S. market, as that was the central topic in Chief Financial Officer Dhivya Suryadevara's comments, with "Truck Franchise" being flanked by "Key Financial Priorities" and "Financial Outlook." Clearly, to gloss the old phrase, the truck segment is where the money is. Suryadevra enumerated how the truck segment is significantly different than other types of light vehicles. Among her points: GM, Ford and FCA have more than 90% of market share. The truck parc has been growing and aging over the past 10 years. Customers are fiercely loyal to the segment—as in 70% of truck buyers are truck buyers. A good number of the vehicles are for commercial use (40 percent). Trucks are "less prone to. . .mobility disruption." Trucks offer high margins. Translaton: The segment is one that they're solidly positioned in. There are lots of old trucks on the road that will need to be replaced by new ones. Perhaps buyers may switch from a Sierra to a Canyon, but it will be a truck. If your livelihood depends on that type of vehicle, even if gas prices go up or the economy begins to go south, you're going to stick with it. Most of the country isn't San Francisco, so trucks will continue to be essential. And, well, they're profitable in the extreme.

Corvette owner finds stolen car, but can't get it back [w/video]

It's not too uncommon to hear about owners being reunited with their stolen cars decades after reporting them missing. The story of Terry Dietrich in Georgia starts that way with police finding her lost 1972 Chevrolet Corvette after over 40 years. However, this case takes a different turn because unless she wants to bid on it, Dietrich's likely not getting the 'Vette back. Just six months after purchasing it in 1972, Dietrich's blue Corvette was stolen in Georgia, and in 1975 the sports car found its way to a man in North Carolina. He kept the car right up until his death just a few months ago, and that's when restorer Gary Green bought the 'Vette from his widow, according to Yahoo Autos. Unfortunately, after acquiring the Corvette, Green found some major discrepancies. For one thing, the listed VIN pointed to a '69 convertible, and there was a different serial number on the frame. Green reported the problem to the local police, and they figured out it was the 'Vette Dietrich lost over four decades ago. Consequently, the cops impounded it. The issue now arises that while Dietrich is the victim of the theft, she isn't technically the car's last legal owner. After the Corvette was stolen, she reported the crime to her insurance company, and it paid on the claim, which essentially forfeited her ownership. To make matters slightly more confusing the company can't find the title on the 'Vette either, according to Yahoo Autos. That leaves the well preserved 'Vette sitting in a police impound lot. It will likely go to auction.