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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

Junkyard Gem: 1998 Cadillac Catera

Every so often, during the last few decades of the 20th century, the suits running each of the big Detroit automakers would eye their European subsidiaries and decide that some car from the other side of the Atlantic could be making dollars over here in addition to pounds or francs or Deutschmarks over there. Chrysler didn't do so well with Simca 1204s or Plymouth-badged Hillman Avengers in the American marketplace (though the Simca-based Omnirizon did very well). Ford USA moved quite a few Capris and Fiestas during the 1970s, then bombed with the Merkur Scorpio and XR4Ti. General Motors tried, over and over, to get Americans to buy Opels (some sold by Buick dealers, others actually badged as Buicks), and I still see the occasional Kadett, GT, or Manta in junkyards to this day. For the 1997 model year, still stinging from the not-so-great sales of the Turin-Hamtramck-built Cadillac Allante, GM took the Omel Omega B and applied Cadillac badges. The result was the Catera, and I found this silver '98 in a Denver self-service yard recently. The Catera had a lot going for it, with a rear-wheel-drive layout and a modern V6 engine that made more power than the BMW 528i's straight-six that year. It should have been able to compete with European luxury sedans in North America because it was a European luxury sedan. Unfortunately, you couldn't get a manual transmission in the Catera, "traditional" Cadillac shoppers thought the Catera lacked a sufficiently massive presence, and younger Cadillac buyers flocked straight to the Escalade starting in 1999. After 2001, the Catera was no more. I still find Cateras in junkyards, nearly 20 years after the last ones were sold, so they appear to have held together pretty well. This one was in nice shape until the end, with all the original manuals still in the glovebox. Even the Catera ballpoint pen remained with the car for its whole life. As we can see in the owner's manual, Cadillac marketed the Catera as "The Caddy That Zigs." The idea was that younger car shoppers would become as Cadillac-obsessed as their grandparents had been. Inspired by the ducks in the Cadillac logo, the Catera marketing team created Ziggy the Duck to pitch this car. Things didn't go so well. The Catera listed at $29,995 in 1998, about $47,600 in 2020 dollars. That made it an affordable alternative to the BMW 5-Series or Acura 3.2 TL, but total Catera sales came to fewer than 95,000 cars over five model years.

Cadillac to add small sedan, crossover as part of major product blitz

Cadillac will add a small sedan and a compact crossover to its lineup in the next several years as part of an ambitious product blitz that will remake its lineup. The sedan will slot below the ATS, which is currently Cadillac's smallest four-door car. It's scheduled to arrive in 2017, Cadillac president Johan de Nysschen told Autoblog at the Detroit Auto Show. The sedan will be followed late that year or in early 2018 by a compact crossover, which will be positioned below the SRX. The crucial redesign of the SRX – Cadillac's top seller – arrives in 2016. It will switch to the brand's new naming system and change to an "XT" prefix followed by a number. The naming scheme debuts on the CT6, which launches in late 2015 and will be positioned above the CTS and XTS sedans. Cadillac also wants to add another crossover that sits between the SRX and its flagship SUV, the Escalade, at some point. Further out, Cadillac's long-awaited Mercedes-Benz S-Class fighter could arrive around 2020, and it would serve as the flagship or "showcase of the brand," de Nysschen said. Cadillac is also looking to expand its powertrain portfolio and is contemplating a wide range of options, including hybrids, plug-in electric vehicles and diesel engines. The new cars and crossovers are part of a $12-billion investment in Cadillac, which de Nysschen described as "an unheard level of capital" from General Motors. In total, the brand will receive eight new products through 2020. "Our product offensive will provide the substance for our ambitions," he said. De Nysschen has set high goals – and made major changes – at Cadillac since he took over the 113-year-old luxury brand in September. The brand moves to a separate headquarters in New York this year, away from GM's base in Detroit, and it has switched advertising agencies in a bid to elevate its image. Cadillac's sales declined 6.5 percent in the United States in 2014 to 170,750 units, and it has the smallest volume of GM's four brands. "Here in the US we continue to make progress, but we also face challenges," de Nysschen said. He added the brand's lineup "clearly limits our growth opportunities in the US market." Still, de Nysschen is taking the long view for Cadillac, noting it took years to turn around Audi, where he was president of its US operations for eight years. Cadillac's global sales have inched up five percent globally this year, spurred by a 47-percent surge in China.