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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

Cadillac issues stop sale on ATS to recall 82k units

Cadillac is issuing a recall on 82,620 examples of the 2013-2016 ATS worldwide to fix a compliance issue with the sunroof controls. Until a service bulletin goes out to take care of things, there's also a stop sale on the luxury compact in the United States, The Detroit News reports. Of the affected models, 63,665 are in the US, according to a statement sent to Autoblog, and 7,922 of them are in Canada. The problem is actually the same issue as a recall on nearly 59,000 examples of the 2013-2015 ATS in the US in February. In them, the controls for the tilt and slide of the roof aren't recessed enough to meet government standards for the force necessary to operate the buttons. The Feds believe that someone could accidentally activate the auto-close and potentially be at risk. At the time, Cadillac dealers installed a new trim plate to add the needed clearance. In the latest update, the company is adding the 2016 model year, and according to The Detroit News, 70 percent of the cars from the original campaign also need another new trim plate. Unsurprisingly for such a minor defect, there are no known crashes, injuries, fatalities, or customer complaints related to this issue, according to the announcement by General Motors. Cadillac ATS Statement: General Motors is recalling 63,665 Cadillac ATS sedans in the United States from the 2013-2016 model years because the power-operated roof panel systems on these vehicles will auto-close when the non-recessed portion of the "Slide" or "Tilt" switches are pressed and the roof panel is open. Because these switches are not fully recessed, they can be actuated with less force than required to comply with applicable federal standards. GM knows of no crashes, injuries or fatalities related to this issue and has received no customer complaints. The total population of the recall including Canada, Mexico and exports is 82,620. Transport Canada Recall # 2015322 Recall Date 2015/07/21 Notification Type Compliance Mfr System Electrical Manufacturer Recall Number 15568 Units Affected The number of vehicles or components affected by the recall. 7,922 Category Car Recall Details Certain vehicles equipped with power-operated sunroof system may fail to conform to Canada Motor Vehicle Safety Standard (CMVSS) 118 - Power-Operated Window, Partition and Roof Panel Systems.

Cadillac confirms CT8/CT9 flagship, ELR successor

Cadillac has certainly been a hot topic as of late, what with Johan de Nysschen now running the joint, moving its headquarters to New York, and overhauling the company's naming structure (only to later publicly defend all of these drastic decisions). Now, looking ahead, de Nysschen is already revealing some details about what's in store for the future, including a raft of new products that include a large, long-wheelbase Mercedes-Benz S-Class rival positioned above the recently announced CT6, along with a successor to the slow-selling ELR coupe.
In an interview with Reuters, de Nysschen says his company has "just signed off on" a new flagship tipped to be called CT8 or CT9. It will compete with the long-wheelbase versions of the Mercedes-Benz S-Class and BMW 7 Series, and should come to market by the end of this decade.
Among other news, the South African executive said a followup to the ELR plug-in hybrid is in development, though it may not be a two-door coupe like the current car. That's not necessarily a bad thing, since the ELR has garnered nothing but slow sales and poor reviews since its launch.