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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

Hennessy wastes no time in supercharging the 2015 Cadillac Escalade

The ink is still drying on the all-new 2015 Cadillac Escalade sales brochures, but that hasn't stopped Texas-based Hennessey Performance (HPE) from leaping out of the gate with its own high-performance variant. In stock form, the big fourth-generation Cadillac flagship arrives with a new small block naturally aspirated 6.2-liter Ecotec3 V8 delivering 420 horsepower and 460 pound-feet of torque. Fresh out of the showroom, the 5,900-pound SUV will sprint to 60 mph in 5.9 seconds.
While that is plenty fast for some owners, others don't want to be shamed by a 550 horsepower Mercedes-Benz GL63 AMG or a 510 horsepower Land Rover Range Rover Sport - both will leave the stock Escalade at a stoplight.
The team at HPE has come to the rescue with its HPE550 supercharger upgrade, which includes a belt-driven supercharger, air-to-water intercooler, recalibrated engine management software and a three-year/36,000 mile powertrain warranty. With 6 psi of boost, the direct-injected 6.2-liter is tuned to deliver an impressive 557 horsepower and 542 pound-feet of torque - gains of 32 percent and 18 percent, respectively, over stock. Although HPE isn't releasing performance figures as of yet, our math says that should be enough power to put the two Europeans in the Cadillac's rearview mirror. The company also offers a set of 20-inch lightweight H10 forged monoblock wheels, to further improve performance.

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.