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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 might outsource vans to AM General

General Motors will possibly boost production of the Chevrolet Colorado and GMC Canyon at the Wentzville Assembly Plant in Missouri by contracting out some commercial van manufacturing to AM General. Demand for the two midsize trucks continues to boom, and GM would like to take advantage of the strong market for them. The possible deal came to light in a letter to workers at the factory, according to Automotive News. "This potential partnership would free up production capacity and allow the organization to capitalize on our ability to build midsize trucks to further satisfy customer demand," a portion of the document allegedly said. AM General would reportedly only take over assembly of the cutaway versions of the Chevy Express and GMC Savana. Customers and critics have quickly embraced the latest Colorado and Canyon since their introduction. The Chevy just won back-to-back Motor Trend Truck of the Year awards. GM also had to add a third shift and extra workers in 2014 just to keep up with demand. The Wentzville plant even increased employment on the weekends earlier in 2015 to assemble an extra 2,000 of the trucks each month. While the two pickups boom, deliveries for the Chevy Express and GMC Savana are down 26.9 percent and 26.6 percent respectively through the first 10 months of the year. GM doesn't break out numbers for the cutaway versions, but they make up about a third of production, according to Automotive News. AM General built the Humvee for the US military and does some contract work with automakers. For example, the company's Indiana factory now produces the Mercedes-Benz R-Class for export to China. Here's hoping this potential deal will help both GM and AM General keep their factories humming. Related Video:

nuTonomy beats Uber to market with self-driving taxi rides, and the latest Corvette ZR1spy shots | Autoblog Minute

Software developer nuTonomy beats Uber to market with self-driving taxi rides in Singapore. A 124 Coupe could soon join Fiat's roadster lineup, and we have the latest spy shots of the new Corvette ZR!. Senior Editor Greg Migliore reports on this edition of Autoblog Mintue. Senior Editor Greg Migliore reports on this edition of Autoblog Mintue. Show full video transcript text [00:00:00] Massachusetts based software company, nuTonomy, launched its self-driving taxi service in Singapore this week. nuTonomy specializes in developing software for self-driving cars. Testing of the companies ride-hailing smartphone app occurred in Singapore, where riders were able to book a free driverless ride. nuTonomy's robo-taxi fleet is comprised of Renault Zoes and Mitsubishi i-MiEVs. Engineers from nuTonomy were present at this public launch as a safety measure. [00:00:30] The company will now continue to collect data and conduct more testing with its self-driving cars in Singapore, Michigan and the United Kingdom. nuTonomy has plans to offer widely-available commercial service in Singapore in 2018. nuTonomy's aggressive play in Singapore has put Uber and its partner Volvo in the unlikely position of playing catch-up. Autocar reported this week that we should expect FCA to add a Coupe [00:01:00] to it's 124 roadster lineup. When? Well, seeing as the 124 Spider just recently made it US dealers we may have to wait until next year to see a hardtop Fiata. It's tough to predict what kind of performance we can expect out of a 124 Coupe but in the U.S. the Spider has 160hp using a 1.4-l turbocharged engine. So the car you see in these pictures is actually Fiat's 124 Rally car that will be used for competition. [00:01:30] Now that's not exactly how the street car will look but it gives you an idea of what a 124 with a fixed roof is gonna look like. This week we got another look at what we think is the Chevy Corvette ZR1 and its massive rear wing. Now to be clear, the images that we're seeing are actually demonstrations. The car was actually captured without the rear wing. However, our spy photographers photoshopped the wing, which we've seen before, on some of these new shots just so you could get [00:02:00] a sense of what the car looks like driving around in it's most recent state. Now we think this car will make more than 700hp, which is kind of a magic number. The Hellcats from Chrysler make 707 so certainly GM wants to beat them.