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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

Mystery shoppers love Infiniti, hate Tesla

Infiniti, followed by Lexus tied with Mercedes-Benz took the top two spots for best sales experience according to mystery shoppers from the latest Pied Piper Prospect Satisfaction Index, while EV manufacturer Tesla recorded the lowest overall score. Not surprisingly, premium brands dominated the top ranks. Including the three already mentioned, luxury brands occupied seven of the top ten spots and included Audi, BMW, Porsche, and the only American brand to crack the upper echelon, Cadillac. Toyota, Volkswagen, and Nissan rounded out the first ten positions. The news for domestic automakers isn't good. Aside from Caddy, the only other star-spangled automaker to score above the industry average is Chrysler. The rest of FCA, most of GM, and all of Ford fell below the line. But Pied Piper's mystery shoppers handed Tesla the biggest walloping – the company is ten full points below the next lowest brand, Volvo, and its score of 86 is 17 below the average of 103. It's baffling, considering the company's touted direct-sales model. "Tesla leaves me scratching my head," Fred O'Hagan, Pied Piper's president and CEO, told Wards Auto. "They own all of their stores, so you would think each one would be doing the same thing. But they're not. Tesla is consistent in its inconsistencies." O'Hagan added that there's a "huge variation" in Tesla's store-to-store effectiveness, and that in some cases, shoppers found showroom workers that acted more like "museum curators," Wards Auto reports. It might be popular to call Tesla the Apple of the car world, but based on Pied Piper's work, the brand has a long way to go to emulate the uniform shopping experience of an Apple Store. The news might be bad for Tesla, but even for the brands that scored below average, there's cause for celebration. Only Tesla and Mini lost points in this year's rankings, and only Mercedes and Lincoln held steady. Every other brand, including Infiniti, which topped the index for the first time, gained at least one point. The biggest improvements belong to Porsche, Land Rover, and Mitsubishi, which all jumped five points. Pied Piper's annual Prospect Satisfaction Index uses mystery shoppers – over 6,100 this year – from across the country to assess dealers and generate rankings from over 50 individual factors. News Source: Pied Piper via WardsAuto Green Audi BMW Cadillac Chrysler Infiniti Lexus Mercedes-Benz Nissan Tesla Toyota Car Buying Car Dealers study

Cadillac cancels its car subscription program after just two years

Cadillac is cancelling its Book by Cadillac subscription service, according to a report from the Wall Street Journal and confirmed to Autoblog by a Cadillac spokesperson. The $1,800 a month service has been in operation since early last year. The Cadillac spokesperson told us this: "Following nearly two years of service, Cadillac will temporarily pause the Book by Cadillac program effective December 1, 2018." This moves comes not too long after the decision to leave its New York City headquarters and return to Michigan. While Cadillac claims the disruption of service will be temporary, there's no defined plan to start the program back up again. The reason for the cancellation? The service ended up being more costly than Cadillac expected it to be. Owners will have 30 days from the time they're notified to turn their vehicles in. If this subscription service was your only transportation, then you better start looking for something else. The service was available in New York City, Dallas and Los Angeles. Subscribers could choose between five different Cadillacs: ATS-V, CTS-V, CT6, XT5 and Escalade. You'd be allowed up to 2,000 miles per month and 18 vehicle swaps per year through the concierge service. Cadillac would bring the car of your choice to you and take the old car away at your whimsy. The price included registration, taxes, insurance and maintenance costs. No long term commitment was necessary to sign up. This makes Cadillac one of the first manufacturers to end a nascent subscription service. If it starts back up again, expect it to look a bit different from the current program. Cadillac says it's using this experience to make strategy adjustments in the future. Whether that means a much more costly program for users, or no subscription program at all, we don't know. Plenty of other manufacturers still offer limited subscription programs in select cities. We highlighted some of the biggest ones in our vehicle subscription service guide here. It'll just be a waiting game to figure out if these modes of ownership take off going forward. For more information on Vehicle Subscription Services, check out the Complete Guide. Related video: Cadillac Car Buying subscription service book by cadillac