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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

CA Chevy dealer allegedly adds $50K 'market value adjustment' to 2015 Z06

It seems to happen with every eagerly anticipated new car – dealerships, recognizing that crushing demand far outstrips the initial limited supply of a new model, inflate the price via a so-called "market value adjustment." We've seen it in the past with a number of new models, and now it's happening again with one of the Detroit 3's hottest vehicles. A dealership in Roseville, CA, outside of Sacramento, has allegedly attached a staggering $49,995 market value adjustment to a 2015 Corvette Z06. We say allegedly because, despite the evidence uncovered by BoostAddict, John L. Sullivan Chevy's online inventory listing doesn't display the price premium of the Z06 in question, a (normally) $93,965 model with the top-end 3LZ trim. It's unclear if either of the dealer's other Z06s, both 3LZs, one of which is in transit, will receive similar price adjustments. Now, legally, Sullivan Chevy isn't doing anything wrong here. Dealerships are under no obligation to observe a manufacturer's suggested retail price, a point General Motors' spokesperson Ryndee Carney pointed out to Autoblog via email. "For the Corvette Z06, Chevrolet has established a Manufacturer's Suggested Retail Price we feel is right for the market. Actual transaction prices, however, are the province of the dealer," Carney said, adding that a dealer zone manager will be discussing the price hike with the dealership. While we also reached out to the dealership over both the market value adjustment and the price of the Z06 as it appears on the company's website, we've yet to hear back as of this writing. Should they reply to our inquiries, we'll be sure to update you. Until then, we'd like to hear what you think about this case. Is Sullivan Chevy simply pricing the cars as high as it thinks the market can bear, or is this a cash grab for an hotly anticipated product? Have your say in Comments.

Autotrader picks best cars for 2015's college grads

Summer is here and the school season is winding to a close. That means millions of students will be graduating college and (hopefully) entering the workforce. For many, that will mean buying a new car suited to the new stage in life into which they will now be embarking. That can be a bewildering choice, especially for someone who's never bought a car before. Fortunately, Autotrader has come up with a short list of recommended cars – new and used – which it recommends to the graduating class of 2015. Among the site's top choices are some compelling crossovers and hatchbacks, including the Buick Encore, Chevy Trax, and Jeep Renegade, as well as the Honda Fit, Nissan Versa Note, Mazda3 and Fiat 500. Can't stretch to buying new, or don't see the point? Autotrader has also identified the Toyota Camry, Ford Fusion and even the Lexus IS as smart buys in the certified pre-owned category. "Any time someone goes through a major life change, such as graduating college, they need to determine if their current ride makes sense for their lifestyle, from both a financial and functional perspective," says Autotrader editor Brian Moody. "For example, while that hand-me-down SUV from your parents was nice when you turned 16, you may want to opt for a safer, more fuel-efficient car as you transition into the working world." Autotrader Names 10 Best Cars for Recent College Graduates ATLANTA, May 28, 2015 /PRNewswire/ -- For many, graduating college is a milestone like no other – it represents a new chapter, a proud accomplishment and, fortunately or unfortunately, financial independence. Luckily for graduates who are in the market for a new car to suit their post-college lifestyle, Autotrader's expert editors say now is a great time to make a purchase, as dealerships are flush with affordable models that are fun, fuel-efficient and thoughtfully designed. Autotrader Logo "Any time someone goes through a major life change, such as graduating college, they need to determine if their current ride makes sense for their lifestyle, from both a financial and functional perspective," said Brian Moody, site editor for Autotrader.