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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

Forget everything you know about Cadillac V

Cadillac rolled out the CT4-V and CT5-V performance sedans to a rather confused group of journalists last night. What are these cars? Only 355 horsepower in the CTS-V replacement? And just 320 horsepower for the ATS-V successor? Surely, there's something out of place — you can get up to speed with all the details here. Cadillac understood our confusion and explained what was going on rather quickly. The explanation means you have to forget everything you know about what "V" means for a Cadillac, though. Any Cadillac with the singular "V" badge on it previously has denoted the absolute top-tier of performance for that particular model. The CTS-V had the Corvette Z06 engine in it and made 640 horsepower. The ATS-V had a boosted 3.6-liter V6 good for a raucous 464 horsepower. They were equivalent to BMW M, Mercedes-AMG or an Audi RS. We're not talking about the lesser M or AMG models, either. No, the last Cadillac Vs were meant to compete with cars like the C63 or M3, the top-tier of performance in those brands' lineups. This is where you're going to have to start re-learning, because that's no longer the case for a Cadillac with a V badge gracing the rear end. What Cadillac has essentially done is demote what V means, with the intention of offering "something else" above it. With this new strategy, we'd equate a Cadillac V to something like an AMG 43, M340i, or Audi with an S badge on it. Cadillac has even come out with a car similar to this strategy before in the V-Sport. That didn't confuse everybody, though, because the name was different, and the strategy was clear. Now, Cadillac V is just a small stepping stone to these mysterious high performance cars still to come. We asked for any information concerning these future track-ready, fire-breathing monsters, but mum is the word for now. The naming strategy for something above a V is uncharted territory, and it'll also force everyone to learn what the top of the Cadillac lineup is all over again. Cadillac CT5-V View 6 Photos Why confuse folks like this? Cadillac wants to take advantage of the V brand cache in more of its lineup than just two super sedans. Think future vehicles like an XT5-V, XT4-V and others like that. Now that V doesn't mean a Nurburgring-conquering 500+ horsepower luxury muscle car, it makes it far easier for Cadillac to get V badges on everything. Obviously, GM isn't the first to think of this strategy.

Cadillac still planning for big things in China

Despite some hiccups, China remains the auto industry's great hope for new vehicle sales, with significant sales gains and a huge upside. Nowhere is that hope more fervent than at General Motors, which offers eight different marques in the Asian nation. China has been GM's single biggest market the last three years running, and is unlikely to give up that title anytime soon. Yet its premiere brand, Cadillac, has remained essentially stagnant, selling just 30,000 units in China last year. That's in a segment where sales of luxury vehicles has outpaced that of the larger Chinese market. So what gives?
According to Cadillac officials Autoblog spoke with in China this week at the Shanghai Motor Show, it's been a problem of product - they haven't had the right ones. Displacement taxation issues, import tariffs and currency fluctuations have all conspired to make the brand's products less appealing than they might otherwise have been. But GM is stepping on the gas with Cadillac, and executives are eyeballing 100,000 sales by 2016 - more than triple the Wreath and Crest's current volume. And the expectations for the brand only get more ambitious from there - they're shooting for 10 percent of the luxury market by 2020. Bob Socia, President of GM China, promises that there will be a new Caddy launched in the market each year from now through 2016 and most will be built in China. Characterizing the company's efforts to revive the brand's fortunes as a "relaunch" of sorts, Cadillac also figures to gain dealers as GM expands its sales outlet footprint westward.
New products like a made-in-China XTS sedan (with a market-specific 2.0-liter four-cylinder to avoid heavy displacement taxes) will help, and Socia hinted that the ATS sport sedan could be next in line for in-country production. The SRX crossover - currently the brand's best-selling model in China - will also likely get a long look for future local production when the next-generation model is introduced. In the meantime, Cadillac unveiled the Escalade ESV Hybrid (shown above) as its latest model addition to capitalize on the market's white-hot luxury SUV segment.