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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 shows off 'digital vehicle platform' enabling more in-car tech and OTA updates

It appears to have dropped the sobriquet "Global B," but General Motors' new electrical architecture has bowed in drawings and video. This is the "digital vehicle platform" GM president Mark Reuss spoke to Reuters about in 2015, saying it would move a great deal of a vehicle's computer work to the cloud and enable over-the-air updates. Reuss took the microphone for the debut, too, saying, "Our new digital vehicle platform and its eventual successors will underpin all our future innovations across a wide range of technological advancements, including EVs and expanded automated driving." The system will go into production later this year, appearing in dealerships first either on the 2020 Cadillac CT5 or the mid-engined 2020 Chevrolet Corvette. Yes, these are the same electronics cited for delaying the launch of the C8 Corvette over excessive draw, security and getting the more-than-100 computer modules to communicate seamlessly. When Car and Driver asked about that, GM replied with "No comment." Volkswagen's having the same issues with the Mk8 Golf right now, though, so GM isn't alone, and this will be the new normal among OEMs for a while. What's certifiable is that the new architecture is robust enough to handle 4.5 terabytes of data per hour, which is five times what GM's current wiring can handle. And thanks to Ethernet connections of 100 Mbps, 1 Gbs and 10 Gbs, communication within and without the vehicle happens much faster. The advances mean better screen resolutions, better battery management for hybrids and electric vehicles, the capability for over-the-air updates and "functionality upgrades throughout the lifespan of the vehicle." Cadillac's Super Cruise has already been lined up as a leading candidate for constant improvements in the driving assistance suite, a key part of GM's "vision for a world with zero crashes, zero emissions and zero congestion." And whenever GM decides to take the plunge, it will mean a 48-volt electrical system. More than 300 specialists worked on the digital platform, and security was a huge part of the task. We've already heard that GM consulted with Boeing and military contractors on how to prevent hacking. The carmaker has an internal Product Cybersecurity group that reached out to the research community, and created a "bug bounty" program to crowdsource uncovering any flaws.

Diesel-powered 2020 Chevrolet Silverado, GMC Sierra get big price cuts

General Motors is reducing the price difference between its diesel-powered light-duty pickups and their gasoline-burning counterparts, according to a recent report. As of September 3, 2020, the Chevrolet Silverado 1500 and the GMC Sierra 1500 benefit from a $1,500 price cut when they're ordered with a turbodiesel under the hood. Enthusiast website GM Authority first reported the news after looking at internal documents sent to dealers across the nation. It wrote the discount applies to in-stock and in-transit units of the Silverado and the Sierra (pictured), and it added dealers will begin receiving amended window stickers on September 8. And, it's not just a quick, easy way for General Motors stores to clear out 2020 inventory. Incoming 2021 models will benefit from it, too. Chevrolet's cheapest diesel-slurping 2020 Silverado, a double-cab LT with two-wheel drive, now starts at $44,000 once a mandatory $1,595 destination charge enters the equation. For context, the same configuration costs $38,795 including destination when it's ordered with the 2.7-liter turbocharged four-cylinder, which is the smallest and cheapest engine on the roster. Selecting the more efficient engine option costs buyers $5,205. At the other end of the spectrum, the crew-cab High Country with a standard cargo box and four-wheel drive is now priced at $59,690. Walk a block to the GMC store, and you'll need to spend between $44,470 (double-cab SLE with two-wheel drive) and $61,685 (crew-cab Denali with a regular cargo box and four-wheel drive) for a diesel-powered Sierra. It doesn't sound like either company is making major mechanical changes to the trucks for 2021. Both are powered by a 3.0-liter straight-six Duramax engine, which makes 277 horsepower and 460 pound-feet of torque. Rear-wheel drive and a 10-speed automatic transmission come standard, and four-wheel drive is offered at an extra cost. In its most efficient configuration, the Silverado returns 23 mpg in the city, 33 mpg on the highway, and 27 mpg in a mixed cycle, impressive numbers for a body-on-frmae pickup that's as heavy as it is capable. Ram's diesel-powered 1500 posts EPA estimates of 22, 32, and 26, respectively. Ford pledged the recently-unveiled 14th-generation F-150 will offer a turbodiesel engine, too, but its fuel economy figures are not available yet.