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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

GM recalls half-million full-size SUVs to address seatbelt issue

GM is recalling its redesigned full-size SUV models to address improperly riveted mounts securing the third-row seatbelts that may fail in the event of an accident. The population includes the 2021-2022 Cadillac Escalade and Escalade ESV, 2021-2022 Chevrolet Suburban and Tahoe, and 2021-2022 model year GMC Yukon and Yukon XL, for a total of 484,155 vehicles. "Operators at the supplier’s manufacturing plant may have not properly followed manufacturing processes and inadvertently missed the rivet forming operation," GM said in its defect report to NHTSA. "In certain of these vehicles, the rivet that retains the buckle to the mounting bracket in the left or right side third-row seatbelt buckle assembly may not have been properly formed during the manufacturing process. If the third-row seatbelt assembly is not properly riveted, it may not properly restrain occupants in a crash, increasing the risk of injury." Fortunately, the fix is relatively simple. GM service technicians will inspect the rivets on the rear seatbelt buckle assemblies and replace the entire unit if the rivets are not to spec. Dealer notifications have already been distributed; owners should receive notice start in September. Related video: Cadillac Chevrolet GM GMC Ownership Safety SUV

'Baby Driver' is a car chase movie set to music

The Fate of the Furious is certainly the 6,000-pound SUV in the garage of automotive movies, but that doesn't mean gearheads are starved for options. The upcoming film Baby Driver looks to be a winner for car guys, featuring exciting chases with cars including a "hawk-eye" Impreza WRX, a Dodge Challenger, and a 1980s Chevy Caprice. The movie is written and directed by Edgar Wright, whom you may know as the man behind movies such as Sean of the Dead, Hot Fuzz, and Scott Pilgrim vs. The World. And based on the two trailers released so far, seen above and below, it's about a young man by the name of Baby, who is a getaway driver for criminals. He's apparently the best in the business, and the secret to his success is the music he listens to while he's driving. He also wants out, but his boss, played by Kevin Spacey, has no intention of letting him go. Spacey is one of a number of major stars in the film, including Jamie Foxx and John Hamm. The driving action shown in the trailers definitely looks entertaining. The WRX is seen doing an array of drifts and J-turns. There is some driving precision on display here that wouldn't be out of place in a Gymkhana video. And it looks like Wright's attention to detail in his shots and transitions, as well as some solid comedy relief, are all going to be present. The film comes out this August. Related Video: News Source: Sony Pictures Entertainment / YouTube via Road & TrackImage Credit: Sony Pictures Entertainment / YouTube TV/Movies Chevrolet Dodge Subaru Videos baby driver