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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

Surprise! GM putting aluminum in next-gen pickups

Last month, General Motors launched a series of ads touting the benefits of steel over aluminum – specifically, with regard to the Chevy Silverado versus the Ford F-150. (Kind of. We're not sure what a grizzly bear has to do with anything.) We took issue with the ads, with editor in chief Mike Austin saying they "reek of insecurity, and distract from the Silverado's strengths that could be used for positive advertising." But what bothers us more, is that yet another report surfaced claiming anti-aluminum GM will indeed use the weight-saving material in its next-generation fullsize trucks. On Tuesday, GM announced a $877-million investment for its truck plant in Flint, MI. But Reuters says that huge overhaul is because the trucks will use "substantially different equipment than the tools GM uses today." The report specifically states, "People familiar with the company's plans say GM's next-generation pickups and SUVs will make use of various materials, including aluminum and lightweight steel, to shed weight and gain fuel efficiency to meet tougher federal standards." The Silverado already uses a few aluminum components in the engine and hood, and if more widespread use will help GM build its best fullsize trucks ever, then that's great. Honestly, we have no reason to doubt that aluminum will be used in the next Silverado and GMC Sierra. We just hope GM remembers that nothing is ever truly deleted from the bowels of the Internet when it launches the subsequent "look how great aluminum is!" campaign. Related Video: News Source: Reuters Green Plants/Manufacturing Chevrolet GM GMC Truck aluminum steel

2016 Chevrolet Malibu First Drive [w/video]

You have to appreciate honesty in this business. When a car company admits its offering in a segment isn't up to the task, it catches you by surprise. The surprisingly open Chevy reps stopped short of saying that making the last Malibu smaller was a mistake, but given that the righting of the ship included a lengthening of this new model, it was certainly implied. The eighth-generation Malibu lasted only three years, with a major update coming just one year in to try and fix some of the bigger concerns. The goal for the 2016 Malibu wasn't to make a competent product better, it was to make an okay one good again. That started with a stretch. The Malibu is long again, a big car that meets America's warped idea of a midsized car. Because of this, the Malibu's dimensions sidle up to the Impala's. In fact, it's within a fraction of an inch of the Impala's wheelbase measurement, and sits right between the last Malibu and the Impala in terms of EPA passenger volume. The back seat gets the most of the payoff, bringing it back into competition with other midsized counterparts. The Malibu is now one of the longest in the segment, but also among, if not the, lightest. The 2016 model is claimed to be about 300 pounds lighter than its dimensionally challenged predecessor. While most new models tend to choose between lighter or larger these days, Chevy managed not-insignificant improvements to both. Styling doo-dads no longer separate the trim levels, it's the features inside that fuel the upsell. Some of that weight came out of the front end. The aluminum hood is lighter than before, and we'd wager that's because it stops very short of the leading edge of the car. Instead, the nose is enshrouded in a big plastic fascia, which has to be an advantage at the scales but creates a somewhat unfinished look. That's amplified by the fact that everything ahead of the hood is a bit busy, and actually surprisingly aggressive, in contrast to the rest of the design. The new Cruze, with its cowl-to-grille hood, wears a more cohesive new-Chevy front end. The styling adopts the, dare we say it, coupe-like look of many (most?) new family sedans. The profile is attractive enough but almost generic now since the Chrysler 200, Ford Fusion, and others have already moved in this direction. The rear-end styling is inoffensive, almost original Mercedes CLS meets current Impala.