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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

Cadillac CT5-V, XT6 and more power to the Subarus | Autoblog Podcast #616

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Consumer Editor Jeremy Korzeniewski to talk about driving the new Cadillac CT5-V, as well as the XT6. Then they discuss the news about the Subaru WRX STI and Subaru Crosstrek getting more power. Finally, they take the time to reflect on the Chevy Impala, which passes on into the annals of history. Autoblog Podcast #616 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Driving the 2020 Cadillac CT5-V Driving the 2020 Cadillac XT6 2021 Subaru WRX STI getting more power? 2021 Subaru Crosstrek getting more power Saying farewell to the Chevrolet Impala Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video:

2014 Cadillac ELR leases for $699 a month

Most Autoblog readers thought the $75,000 price tag on the 2014 Cadillac ELR was too high. If you can't swing the MSRP all in one go, how does a lease price of $699 a month sound? That's the amount that Cadillac is offering on the official ELR website, with some caveats, of course. First off, it appears that this lease price is for just for "current owners and lessees of all 1999 or newer GM vehicles." They will also have to pony up $4,999 at signing (all others will need $5,999). Second, the $699-a-month price is for a 39-month lease. Then, of course, "tax, title, license, dealer fees and optional equipment [are] extra" and "each dealer sets own price." Also, it appears that this lease deal is only good until the end of January. Cadillac started shipping the ELR plug-in hybrid coupe to dealers last month. There are two things to note in the fine print. The most surprising is that the payments are based on "a 2014 Cadillac ELR with an MSRP of $76,000." That's $1,000 more than the official MSRP announced in October. Then we get to the real kicker: The lease limits you to a mere 32,500 miles, which is just 833.3 miles a month. Well, 'limit' isn't the exact word, since you can certainly drive more. All you have to do is pay 25 cents per mile for each mile over 32,500. Drive the national average of 13,476 miles in a year? That comes to 43,797 miles over 39 months, which is 11,297 extra miles and an extra $2,824.25.