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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

Chevy finishes restoration of damaged 1 millionth Corvette

When a sinkhole at the National Corvette Museum devoured eight, rare examples of the iconic American sports car last year, some of the victims emerged better than others. While damaged, the 2009 Corvette ZR1 Blue Devil was able to drive out under its own power, making for a fairly straightforward restoration. Meanwhile, the one-millionth 'Vette came out looking like a pancake. Bringing the convertible back to perfection has taken four months and 1,200 man-hours, but the milestone car is finally on display again. After being a brief exhibit at the National Corvette Museum, the millionth 'Vette was moved to the General Motors Design Center. There, a 30-person team started on the difficult restoration. "When we disassembled it, we found that each employee involved in building it had signed a part of the car, which was fantastic and moving to see," said GM executive Mark Reuss. Therefore, the team tried to retain as many original parts as possible. The damage was extensive, and repairs included straightening the front sub-frame damage, patching the seats, and carefully restoring the dashboard pad to maintain the signatures below. The hood, front fascia, and side sills were replaced with parts from a donor vehicle. To keep the 'Vette perfect, the team scanned the names and put them on the new components. In one case, they even went back to an original employee to sign a replacement part. Surprisingly, the engine and transmission were fine. With the work done, the National Corvette's Museum's revived exhibit is nearly complete. Five of the other cars aren't being restored, and the museum is bringing the 1962 Corvette back to life. <p>Your browser does not support iframes.</p> Chevrolet Fulfills 1 Millionth Corvette Restoration Pledge Sinkhole-damaged milestone returns to National Corvette Museum 2015-09-03 BOWLING GREEN, Ky. – After more than four months and 1,200 man-hours of painstaking craftsmanship, restoration of the milestone 1 millionth Corvette – a white 1992 convertible – is complete. It was unveiled today at the National Corvette Museum, where it returns as part of the permanent exhibit. The car was damaged on Feb. 12, 2014, when it and seven other rare Corvettes tumbled into a sinkhole that opened beneath the museum's Skydome area. Chevrolet pledged to restore it.

China's rise, global restructuring wither GM's Korea division

An article in the Daily Kanban suggests the sun is setting on GM Korea, and it could already be well into dusk. GM Korea came about when General Motors, along with co-investors SAIC and Suzuki, bought Daewoo Motors from parent company Daewoo Group in 2001; it had a previous tie-up with GM, a joint venture that ended in 1992, although Daewoo cars were based on GM cars until 1996. Over the decade following the purchase, it became such an important part of operations that it was renamed GM Korea in 2011, "to reflect its heightened status in [the] global operations of GM." Just two years later, the printed rumors were that the subsidiary responsible for a fifth of Chevrolet's global production could be shutting down. The division's sales were down almost 21 percent through November of last year, counting domestic South Korean sales, exports, and CKD – Complete Knock Down – products. That makes the labor strife, already an issue for four years, even more acute, reports say the subsidiary will lose $36 million a year if it can't get the job and wage cuts it wants, and government concessions can't make up for the losses. And it gets worse, so head over to Daily Kanban to read the rest of the story.