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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 laying off 510 amidst slow Cadillac, small car sales

General Motors is laying off about 510 workers from two factories beginning in January, and it could be months before the automaker needs some of that latent capacity to come back on line. A combination of poor sales and high dealer inventories are prompting the cutbacks, according to Automotive News.
The largest changes come at GM's Lansing Grand River plant, where the Cadillac ATS and CTS are made. An entire shift of about 350 workers is being laid off, but the automaker hopes to find positions for some of them at other nearby factories. The decision leaves just a single shift building vehicles there. According to Automotive News, the move is partially spurred by Johan de Nysschen's plan to make Cadillac a more exclusive brand.
The lost shift will likely return for production of the next-generation Chevrolet Camaro at the plant, according to the report, but GM isn't saying when that will be. A previous announcement from the Canadian Auto Workers union indicated that the Oshawa, Ontario, factory would lose the coupe in late 2015 or early 2016.

Cadillac issues stop-sale on recalled CTS, SRX

General Motors has issued a stop-sale order on the Cadillac CTS and SRX, both of which were recalled late last month. Why the stop-sale after all this time? Well, um, GM apparently doesn't know how to fix them.
The stop-sale covers all used Cadillac CTS sedans, coupes and wagons from model years 2003 to 2013, as well as new 2014 coupes and wagons. The SRX crossover stop-sale, meanwhile, only covers used vehicles from model years 2004 to 2006.
Automotive News reached out to GM spokesperson Alan Adler, who told the news pub that the company's engineers were "looking at one common solution" for the affected vehicles, although "they don't have it yet."