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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

2016 Chevy Camaro to drop 200 pounds

The sixth-generation Chevrolet Camaro makes its grand debut on May 16 at a big celebration on Detroit's Belle Isle. Until then, Chevy's strategy seems to be showing off the pony car's new components piece by piece. With the exhaust headers and front end already on display, the Bowtie is now giving a glimpse at some of the upcoming model's aluminum components. The Camaro is going on a diet for its latest generation, and Chevy claims that the switch to the Alpha platform and other new components shed over 200 pounds compared to the current model. That will put the pony car at around 3,500 pounds. The lower weight will contributes to better fuel economy, quicker acceleration and more direct handling, according to the automaker. Among the changes are aluminum front and rear suspension assemblies (pictured above) that weigh 21 percent less than the current units. Also, Chevy promises in its announcement "links on some models feature an intricate, structurally optimized design made with a rigid composite material that's even lighter than aluminum." In addition to these improved parts, the Camaro uses the lightweight metal for the beam that supports the instrument panel to save 9.7 pounds more. The only two pieces reportedly carrying over to the latest design are Chevy's bowtie and SS badges, and at least one engine in the range is known to be a version of the 6.2-liter LT1 V8. With over a month until the next Camaro's debut, we might get a glimpse of even more of the car's new parts in the coming weeks. Related Video: 2016 Camaro Does More with Less New model is at least 200 pounds lighter than current car 2015-03-30 DETROIT – For the all-new, 2016 Chevrolet Camaro, the team was challenged to improve the handling, acceleration and fuel economy of the award-winning current model. To meet all three objectives, the team focused on a singular mission: reduce mass. By obsessively searching for opportunities to save ounces, the team pared more than 200 pounds off the Camaro compared with the fifth-generation model. As a result, the Camaro does more with less, according to Al Oppenheiser, Camaro chief engineer: "We kept the cornering confidence and control that make the Gen 5 Camaro 1LE so fun to drive, and added a greater sense of agility," he said. "The new Camaro brakes harder, flicks into corners more quickly, and drives out of the corner faster.

Zombie cars: Discontinued vehicles that aren't dead yet

Car models come and go, but as revealed by monthly sales data, once a car is discontinued, it doesn't just disappear instantly. And in the case of some models, vanishing into obscurity can be a slow, tedious process. That's the case with the 12 cars we have here. All of them have been discontinued, but car companies keep racking up "new" sales with them. There are actually more discontinued cars that are still registering new sales than what we decided to include here. We kept this list to the oldest or otherwise most interesting vehicles still being sold as new, including a supercar. We'll run the list in alphabetical order, starting with *drumroll* ... BMW 6 Series: 55 total sales BMW quietly removed the 6 Series from the U.S. market during the 2019 model year. It had been available in three configurations, a hardtop coupe, a convertible and a sleek four-door coupe-like shape.   BMW i8: 18 total sales We've always had a soft spot for the BMW i8, despite the fact that it never quite fit into a particular category. It was sporty, but nowhere near as fast as similarly-priced competitors. It looked very high-tech and boasted a unique carbon fiber chassis design and a plug-in hybrid powertrain, but wasn't really designed for maximum efficiency or maximum performance. Still, the in-betweener was very cool to look at and drive, and 18 buyers took one home over the course of 2021.   Chevy Impala: 750 total sales The Impala represented classic American tastes at a time when American tastes were shifting away from soft-riding sedans with big interior room and trunk space and into higher-riding crossovers. A total of 750 sales were inked last year.   Chrysler 200: 15 total sales The Chrysler 200 was actually a pretty nice sedan, with good looks and decent driving dynamics let down by a lack of roominess, particularly in the back seat. Of course, as we said regarding the Chevy Impala, the number of Americans in the market for sedans is rapidly winding down, and other automakers are following Chrysler's footsteps in canceling their slow-selling four-doors. Even if Chrysler never really found its footing in the ultra-competitive midsize sedan segment, apparently dealerships have a few leftover 2017 200s floating around. And for some reason, 15 buyers decided to sign the dotted line to take one of these aging sedans home last year.