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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 is bringing a new concept to Pebble Beach

Cadillac will debut a new concept Thursday in Monterey. The company also released teaser video, but it only shows us a few glimpses of interior parts and a concept drawing that seems to show a very minimalistic dashboard. The big draw appears to be the large screen filling in for instruments and infotainment. According to Cadillac, the screens are curved OLED panels co-developed with LG, and the technology behind them will appear in a future Cadillac. Bringing a new concept to the famous Monterey Car Week is a return to form for Cadillac. In past years the company brought beautiful concepts like the full-size, four-door Ciel convertible, and the taught, athletic Elmiraj coupe. The latter of these showcased designed cues that trickled into production Cadillacs. No word (or pictures) on the exterior yet. We'll be sure to have complete coverage of the concept later this week. Related Video: Image Credit: Cadillac Cadillac Concept Cars Videos Pebble Beach

Cadillac Celestiq electric sedan could top $200,000

General Motors teased a slew of new electric vehicles last week at a media event where cameras weren’t allowed, and now thereÂ’s more news about the Celestiq, one of the two EVs in the pipeline for Cadillac. Reports suggest it wonÂ’t come cheap and will retail for at least $200,000. Wall Street Journal auto writer Mike Colias dished that detail, along with word of a mid-2020 launch, on Twitter, attributing it directly to Cadillac President Steve Carlisle. Cadillac has made no official mention of starting price for either the Celestiq luxury sedan or the Lyriq, an EV SUV that it has previously teased. A spokesman told Autoblog the brand wouldnÂ’t comment on future product speculation. Leftover scraps from Cadillac flagship ‘CelestiqÂ’ news: ItÂ’ll be hand-built in the hundreds per year, Caddy chief Steve Carlisle said. Price? Six figures Â… “and it wonÂ’t have a 1 in front of it.” Due mid-2022. — Mike Colias (@MikeColias) March 5, 2020 If true, the six-figure MSRP would make the Celestiq the most expensive Caddy ever assembled, at least outside of one-off coach builds and the presidential limo, vaunting it into the same class as brands like Bentley, Lamborghini and Rolls-Royce. By way of comparison, the limited-edition ultra-luxury 1957 Cadillac Eldorado Brougham four-door debuted with a $13,074 price tag, the most expensive car of its day and the equivalent of around $120,000 in todayÂ’s dollars. So what do we know about the Celestiq? For starters, itÂ’ll be a halo flagship hand-built in limited quantities somewhere in the Detroit area. Our reporters who saw the white four-seater describe it as having a long, fastback roofline, no side mirrors or visible door handles, with a long wheelbase, short overhangs and a tinted glass roof. A rendering of the interior showed an LED instrument cluster and infotainment display that stretches between both A pillars, with touchscreen interfaces on the rear of the front seats. It also reportedly features a hatch instead of a conventional trunk and styling cues from the Escala concept from 2016, shown above. Cadillac teased it as the “ultimate luxury experience” and said it would be highly customizable. Cadillac also showed off the Lyriq, the name itÂ’s given to its midsize electric crossover that it had previously promised to unveil in April, possibly at the New York Auto Show, if it manages to happen given the coronavirus.