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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 outgoing Silverado and Sierra until late 2019

As it has done with previous generations, General Motors is keeping the outgoing versions of its 1500 pickups in production despite the arrival of the all-new 2019 Chevrolet Silverado and 2019 GMC Sierra. The production of the previous, K2 generation models will begin to be wound down gradually, according to Automotive News, starting with crew cabs "early next year," and double and regular cab models following during "the early second half of next year." The old model trucks will continue to be built into "late 2019" based on market demand, GM's spokesperson Kim Carpenter said. The Chevrolet will go by the name Silverado LD, with the GMC Sierra designation still to be announced. Some of the outgoing models are built by sharing the assembly work between two GM plants. Partially finished Silverado and Sierra double cab bodies are shipped from Fort Wayne, Ind., to Oshawa, Ont., where the trucks are completed, including receiving paint. This eases the workload in Fort Wayne, where production of the new T1 generation trucks started in July 2018. In January, the Silao plant in Mexico will take on the duties of building new generation regular cab and crew cab trucks. Carpenter also said that the "Oshawa shuttle," as the shared production is called, has been very successful. As a result, 60,000 more trucks will be built than what the original production forecast initially called for. GM's latest quarterly profits, disclosed last week to be $1 billion, have been far higher than expected and will result in full-year profits far higher than what had been predicted in light of steel tariffs. GM isn't the only truck maker taking a similar multi-generation approach for 2019. Both the outgoing and redesigned Ram 1500 are in production, with the previous generation being dubbed Ram 1500 Classic. Related Video:

Autoblog Podcast #394

Episode #394 of the Autoblog Podcast is here, and this week, Dan Roth, Steven Ewing, and Michael Harley talk about the possibility of a supercharged Dodge Viper, the Chevrolet Silverado Rally Edition, the newly released supercharger kit for the Honda CR-Z, and rumblings of an Alfa Romeo 6C. We start with what's in the garage and finish up with some of your questions, and for those of you who hung with us live on our UStream channel, thanks for taking the time. Check out the rundown below with times for topics, and you can follow along down below with our Q&A. Thanks for listening! Autoblog Podcast #394: The video meant to be presented here is no longer available. Sorry for the inconvenience. Topics: Supercharged Viper Chevrolet Silverado Rally Edition Honda CR-Z Supercharged Alfa Romeo 6C In The Autoblog Garage: 2014 Ford Fiesta SE 2015 Cadillac Escalade 2015 Toyota Tundra TRD Pro 2015 Audi A8 L TDI Hosts: Dan Roth, Steven Ewing, Michael Harley Runtime: 01:32:30 Rundown: Intro and Garage - 00:00 Supercharged Viper - 44:25 Chevrolet Silverado Rally Edition - 55:19 Supercharged Honda CR-Z - 01:00:52 Alfa Romeo 6C - 01:07:29 Q&A - 01:13:41 Get the podcast: [UStream] Listen live on Mondays at 10 PM Eastern at UStream [iTunes] Subscribe to the Autoblog Podcast in iTunes [RSS] Add the Autoblog Podcast feed to your RSS aggregator [MP3] Download the MP3 directly Feedback: Email: Podcast at Autoblog dot com Review the show in iTunes