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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 cutting Chevy Sonic, Buick Verano production [UPDATE]

UPDATE: A previous version of this story indicated that Orion Assembly would be idled for seven weeks, from February 16 through April 6. This was incorrect. The factory will instead only be idled for the weeks of February 16 and April 6. The story has been edited to reflect this. General Motors has announced that the factory responsible for the Buick Verano and Chevrolet Sonic will be idled for the weeks of February 16 and April 6, with blame being placed on excess supply. The Orion Assembly plant, about 45 minutes north of GM's Renaissance Center headquarters, employs about 1,800 people, but they'll be given a pair of furloughs as inventories of the sub-compact Sonic and premium compact Verano reach 127 days and 84 days, respectively. That works out to 26,600 Chevys and 9,800 Buicks waiting for buyers. According to Automotive News, the compact Chevy sales bested the industry average in 2014, jumping up nine percent versus the the overall segment's eight-percent gain, while the Buick sedan's sales were down four percent. When asked about the shutdown, a GM spokesman told AN that it will "build to market demand," while also pointing out that the company did not comment on production plans. News Source: Automotive News - sub. req.Image Credit: Bill Pugliano / Getty Images Plants/Manufacturing Buick Chevrolet GM buick encore orion assembly

Junkyard Gem: 1986 Chevrolet Sprint Plus

General Motors sold second- and third-generation Suzuki Cultuses with Geo or Chevrolet Metro badging in the United States from 1989 through 2001 model years, and we've all seen plenty of those cars on the street over the years. The first-generation Cultus was sold here as well, with Chevrolet Sprint badges, and I've found a rare example of the Sprint five-door hatchback in a Northern California car graveyard. The Chevy Sprint first appeared on the West Coast as a 1985 model, then became available everywhere in the United States for the 1986 through 1988 model years (in Canada, it was sold as the Pontiac Firefly). It was available here as a hatchback with three or five doors; for 1986 only, the five-door was badged as the Sprint Plus. Soon enough, The General would be selling many more Asian-built cars with Detroit badges here. Isuzu I-Marks were sold as Chevrolet/Geo Spectrums starting in the 1986 model year, while Daewoo provided the Pontiac LeMans two years later. Under the hood, a 1.0-liter three-cylinder rated at 48 horsepower. The five-door Sprint cost $5,580 in 1986, which was $200 more than the three-door (those prices would be $15,445 and $14,891 in 2023 dollars). I've documented seven discarded Sprints prior to this one (including an extremely rare Turbo Sprint), and all of them were three-doors; we can assume that price was the most important factor for Sprint buyers. Gasoline prices were crashing hard during the middle 1980s, but memories of gas lines and odd-even-day fuel rationing from 1979 remained strong. What cars competed with the '86 Sprint on sticker price? Well, there was no way to undercut the hilariously affordable (and terrible) Yugo GV, which cost $3,990. The much bigger (but still pretty bad) Hyundai Excel listed at $4,995, while Toyota would sell you a sturdy (but zero-fun) Tercel starting at $5,448. Even the wretched Chevy Chevette — yes, it was still available in 1986 — cost $5,645. The original buyer of this car was willing to shell out an extra $395 to get an automatic instead of the base five-speed manual. That's about $1,093 in today's money. This car must have been slow. By the end, the doors were held shut with duct tape, but it still stayed alive until age 37. 53 miles per gallon on the highway! It does everything. The camels of the highway.