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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 to build $1.3 billion Cadillac plant in China

General Motors has gotten approval to build a $1.3 billion manufacturing facility for its Cadillac brand in China. China's National Development and Reform Commission signed off on plans for GM to build the plant in the country's Shanghai's Jinqiao zone; construction is expected to begin in June of this year. According to a Bloomberg report, the plant will have an annual production capacity of 150,000 units.
No surprise here, but Cadillac would like to sell a lot more cars in the plush Chinese luxury market. The brand moved only 30,010 cars in China last year, compared with 400k for Audi, and about 330k for BMW. With Cadillac already telling us that it would be moving production of its XTS sedan to China - a production decision that saves having to pay 25-percent import tariffs - approval of the factory is a critical win for the company.
In fact, according to earlier comments by GM China president Bob Socia, it's at least conceivable that Chinese-built Cadillacs could be shipped back to the US for sale. The brave new world of globalization, getting stranger by the minute.

2015 Cadillac ATS, CTS recalled over brake issue

A problem with the brakes on the 2015 ATS and CTS has prompted Cadillac to issue a recall. According to the notice below from the National Highway Traffic Safety Administration, the issue revolves around the bracket that connects the brake pedal assembly and the rod that actuates the brakes. Even under normal operation, that bracket could fracture, impeding the ability to slow or stop the vehicle. That, as you're surely aware, could increase the risk of a crash. The issue affects a reported 2,163 vehicles in the United States. Owners will need to be bring their vehicles in to their local dealership to have those brackets replaced starting on August 1. See the complete recall notice below. RECALL Subject : Brake Pedal Bracket may Fracture Report Receipt Date: JUN 09, 2015 NHTSA Campaign Number: 15V358000 Component(s): SERVICE BRAKES, HYDRAULIC Potential Number of Units Affected: 2,163 Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2015 Cadillac ATS and CTS vehicles. The affected vehicles have a bracket between the brake pedal assembly and the rod that actuates the brakes that may fracture during normal brake pedal operation. CONSEQUENCE: If the bracket fractures, the driver would not be able to apply the brakes, increasing the risk of a crash. REMEDY: GM will notify owners, and dealers will inspect the vehicle and replace any affected bracket, free of charge. The recall is expected to begin August 1, 2015. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 15352. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.