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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

About 150 Cadillac dealers would rather leave the brand than sell EVs

Dealerships might hamper GM’s plans to electrify its cars. Wall Street Journal tipsters claim that roughly 150 GM dealerships in the United States have decided to drop the Cadillac brand and accept a buyout (ranging from $300,000 to over $1 million) rather than spend about $200,000 to upgrade the dealerships with charging stations, repair hardware and other equipment needed to sell EVs. Many of these dealerships only sell a few Cadillacs per month versus more for Buick, Chevrolet and GMC, but itÂ’s still a significant blow when GM has 880 Cadillac dealers in the country. Cadillac brand leader Rory Harvey confirmed to the WSJ that GM was offering buyouts, but didnÂ’t say how many dealers took them or how much they were worth. The exodus underscores the challenges for conventional car brands as well as the potential advantages for alternatives like Tesla. As brands like GM are heavily dependent on dealerships, they have to please owners to have a chance of strong sales — and thatÂ’s difficult when theyÂ’re not certain about demand, even without the pandemic. Tesla and other direct-to-customer EV makers arenÂ’t bound by physical stores and already have the infrastructure in place for service centers. Dealers might not have much choice in the future. California is banning sales of new gas-powered cars by 2035, and that will likely force automakers to electrify no matter how dealership owners feel. The buyouts now arenÂ’t necessarily temporary, but we wouldnÂ’t rule out some shops having a change of heart as the effective EV deadline approaches. Related video:

Cadillac Elmiraj has production potential

There are many reasons to love the Cadillac Elmiraj Concept, but not the least of which is how production-ready this big coupe appears to be. Take out the overly fancy interior and a few conceptual elements of the exterior, and this looks like a coupe that could be in dealers now as the successor to the Eldorado.
On top of that, Automotive News is quoting Bob Ferguson, Cadillac senior vice president, as saying that a production version of this car is "very doable." AN adds that if the Monterey showstopper gets the green-light, this car would compete against the upcoming Mercedes-Benz S-Class Coupe and would based on Cadillac's upcoming rear-wheel-drive flagship sedan due out in 2015. The range-topping coupe would debut sometime after the sedan model. Cross your fingers.