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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

2023 Cadillac Lyriq driven, Celestiq coming | Autoblog Podcast #736

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder. JBS is fresh off the first drive of the 2023 Cadillac Lyriq, and our hosts have some thoughts about the upcoming Cadillac Celestiq. Greg has been spending time with the Lincoln Navigator. The next-generation Ford Ranger is coming, and we've got some thoughts about it. We also discuss some of the electric pickups coming our way (and some that will almost certainly not come to fruition). Finally, in this week's "Spend My Money" segment, a reader selling a Tesla Model Y, and is looking to replace it with another EV and a hybrid, with a budget of $70,000. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #736 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Driving the 2023 Cadillac Lyriq Cadillac Celestiq is coming, could cost over $300,000 Driving the 2022 Lincoln Navigator Next-gen Ford Ranger spied Electric pickup trucks in the works Spend My Money: An EV and a hybrid for under $70,000 Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video:

Junkyard Gem: 1997 Cadillac Catera

GM's Cadillac Division was having a tough time in the early 1990s, with an onslaught of Lexuses and Infinitis pouring across the Pacific to steal their younger customers while high-end German manufacturers picked off their older customers. Flying an S-Class-priced model between assembly lines in Turin and Hamtramck hadn't worked out, so why not look to the European outposts of the far-flung GM Empire for the next Cadillac? That's how the Catera was born, and I have found a rare first-year example in a North Carolina car graveyard. Across the Atlantic, GM's Opel and Vauxhall were doing good business with prosperous European car buyers by selling them the sleek rear-wheel-drive Omega B (whose platform also lived beneath the Holden VT Commodore in Australia). Here was a genuine German design that competed with success against BMW and Audi on their home turf! So, the Omega B was Americanized and renamed the Catera. Opel wasn't a completely unknown brand to Americans at the time, since its cars were sold here with their own badging through Buick dealerships from the middle 1950s through the late 1970s (for a much shorter period, American Pontiac dealers attempted to sell Vauxhalls). Even after that, plenty of Opel DNA showed up in the products of U.S.-market GM divisions. The Catera was by far the most affordable Cadillac for 1997, with an MSRP starting at $29,995 (about $59,113 in 2024 dollars). Being a genuine German car, it looked much more convincingly European than the DeVille ($36,995), Eldorado ($37,995) and Seville ($39,995). Inspired by the ducks on the Cadillac emblem (they were really supposed to be martlets, mythical birds with no feet and occasionally lacking beaks), Cadillac's marketers went after youthful car shoppers with a whimsical animated duck named Ziggy. For the 21st century, the birds were removed from the Cadillac emblem in order to attract California buyers under 45 years of age. As we all know, the Catera flopped hard in the marketplace. What sold well in Europe turned out not to translate so well in in North America, especially when bearing the badges of such a historically prestigious brand. The Catera's engine was a 54-degree 3.0-liter V6 rated at 200 horsepower and 192 pound-feet. Just as had been the case with its predecessor, the Allante, no manual transmission was available.