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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

2016 Chevy Volt powertrain technical details

The last time General Motors launched a Chevy Volt, it was operating without really knowing how people would use the plug-in hybrid. Sure, it had experience with the EV1, but the Volt was a new kind of car, and you can see in the archives just how much time GM spent explaining this fresh, new powertrain to potential customers. Then, once the vehicle was released, the company collected voluntary data from a large number of owners to learn about their driving and charging habits. The company also asked them what they wanted most in the new version. There's got to be an algorithm buried somewhere in GM headquarters that was used to take all of the numbers GM collected and spat out the headline figures for the 2016 Volt: 50 miles of EV range and 41 miles per gallon. Another important number – price – is something GM isn't talking about yet (expect it in April or May), but the company is sharing some powertrain details about the upcoming car. At a preview lunch in Detroit last week for the SAE 2015 Hybrid & Electric Vehicles Technologies Symposium that's happening now in California, GM engineers Peter Savagian (who is presenting a paper on the new inverter used in the updated Volt) and Tim Grewe (talking about the entire second-generation powertrain) sat down with AutoblogGreen to tell us about the Volt's all-new propulsion system: The overall gist is that the new Voltec 5ET50 drive unit is lighter, smaller and more powerful thanks to a redesigned two-motor traction drive. As previously reported, the new engine is a 1.5-liter DOHC four-cylinder that offers 101-horsepower (at 5,600 RPM). Grewe said it's "great for range extension." The electric motor side of the powertrain offers 149 motoring horsepower from a two-motor, continuously variable transaxle. Initially, the new engine will be made in Mexico. GM will move production to Flint, MI during the first year it makes the 2016 Volt. The battery is slightly bigger in the new Volt – 18.4 kWh compared to 16.5 in the current-gen – and will have less range variation in the cold. GM is also using more of the overall capacity in the pack in the 2016 Volt than in previous versions, but is not saying how much more. GM is not ready to publish acceleration times just yet, but the 2016 Volt has improved numbers, especially when going from 30-60 miles per hour. Most everything on the new powertrain has become more efficient compared to the first-gen Volt.

2022 Chevrolet Silverado and GMC Sierra now cost more, again

GM Authority put Chevrolet and GMC pickup truck prices under the microscope, spying the same macroscopic issues none of us can avoid seeing: Price increases. The 2022 Chevy Silverado 1500 and 2022 GMC Sierra 1500 have been hit with their third price increases this year. The Heavy Duty versions of those same trucks have been given their fourth price increases this year. Starting with the light-duty options, they've been rung up for another $900 across the board, which breaks down to $800 added to the MSRP and $100 added to the destination charge. The mandatory cost for shipping a truck from the factory to the dealer is now $1,795. That destination fee is now more than 5% of the purchase price of the least expensive 2022 Silverado, the Regular Cab Work Truck trim with a Standard Bed and 2.7-liter turbocharged four-cylinder retailing for $36,395 after destination. And that price is $3,200 more than the initial list price from last December. At the other end, the Silverado ZR2 is up $3,400. Average that out, and the Silverado's MSRP has gone up by nearly $700 every month since initial pricing came out. On the GMC side, the bidding starts at $37,195 for the Regular Cab Pro trim with a Standard Bed, a $4,700 increase over pricing announced last October.  Stepping up a tow rating or two, the Silverado HD is now $1,100 more expensive — $1,000 tacked onto the MSRP, the destination charge plumped another $100 to $1,795. The Silvy 2500 HD now starts at $41,295. The Sierra HD turns the screw a few more degrees, going up by $2,100 after the $100 increase for destination. The low bar for the Sierra 2500 HD is $41,995, a $4,100 rise over the price when it hit dealer lots last summer. Whew. Anyone know where the exit is for this "new normal?" Related video: