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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

2022 Toyota Tundra, Rivian R1T, Blackwing, and Hyundai Kona N Line | Autoblog Podcast #701

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski for a robust week of reviews and news discussion. They start with what they've been driving, and it's a pretty impressive list. The Toyota Tundra and Rivian R1T hold down the truck end of things, with Hyundai Kona N Line and Cadillac CT5-V Blackwing making an appearance on the enthusiast side. The updated Polaris Slingshot rounds things out. Next, they pivot to news, where Maverick guarantees a little more truck talk. That's followed by GM's new 1,000-horsepower monument to crate motor displacement, Stellantis searching for battery partners, details of the new Honda Civic Si and Tesla's massive third-quarter performance. Then, they spend a listener's money. Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #701 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 What we're driving:2022 Toyota Tundra 2022 Rivian R1T 2022 Cadillac CT5-V Blackwing 2022 Hyundai Kona N Line 2021 Polaris Slingshot News 2022 Ford Maverick EPA numbers Chevy's ZZ632 crate engine Honda Civic Si teasers Tesla Q3 profit Stellantis battery deal is one of many to come Spend My money 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.  

Cadillac prepares to top its own 'Ring record with upcoming new CTS-V

It was a big deal back in 2008 when the original Cadillac CTS-V clocked a lap time of 7:59 at the Nürburgring, making it the fastest sedan ever to lap the Nordschleife to that date. Not many four-doors have bested that time since - the list consisting pretty much only of the Porsche Panamera Turbo - but now hot hatches are lapping faster than that, so you can bet that the new one will manage an even better time.
Now we've spotted the upcoming new CTS-based performance sedan several times before undergoing testing in locations around the world, but this is the first time we've seen it at the Nürburgring, apparently using the Goodyear Dunlop test facility as its base of operations (and still wearing Michigan manufacturer plates, incidentally). Considering how well the outgoing CTS-V performed and how much further you can bet Cadillac will push the envelop this time around, a new sedan lap record is almost a certainty - and we can only hope for an all-out war between Europe's performance sedan power houses to ensue.