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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

Junkyard Gem: 2003 Chevrolet Tracker

When General Motors created the Geo brand to sell vehicles designed and — in some cases — built by Japanese partners, the first four models were introduced for the 1989 model year: the Metro (Suzuki Cultus), Prizm (Toyota Sprinter), Spectrum (Isuzu Gemini) and Tracker (Suzuki Sidekick). Geo got the axe in 1997, with the Metro, Prizm and Tracker becoming Chevrolets. Of those, the Tracker survived the longest, with U.S.-market sales continuing into 2004. Here's an example of a very late Tracker, found in a North Carolina car graveyard recently. The 1989-1997 first-generation Trackers were based on the Suzuki Sidekick, while the 1998-2004 Trackers had the Suzuki Vitaras (not to be confused with the much grander Grand Vitaras) as their siblings. Production of these trucks for the South American market (as the Chevrolet Vitara) continued in Ecuador all the way through 2014. The Tracker name has also gone onto some versions of the Chevrolet Trax around the world. This one is a base four-door hard top/rear-wheel-drive model, which had an MSRP of $17,330. That's about $29,789 in 2024 dollars. You'll find one in every car. You'll see. The engine is a Suzuki 2.0-liter straight-four rated at 127 horsepower and 134 pound-feet. A five-speed manual was base equipment, but very few American vehicle shoppers wanted three pedals by the middle 2000s. This truck has the Aisin four-speed automatic. We like it loud. It appears that someone associated with this truck graduated from Julius L. Chambers High School last year. In the United States, the Tracker was replaced by the Saturn Vue. If Tracker can handle (unspecified Middle Eastern country), it can survive the jungle back home. Siempre contigo.

Chevy Silverado gets star-studded treatment at SEMA

Chevrolet has quite a presence ready for the 2015 SEMA Show, including custom takes on the Camaro and Spark. As one of the company's most popular models, the Silverado isn't left out of the fun, either, thanks to a trio of concepts to highlight what's possible for the aftermarket event. Camouflage is supposed to blend in, but the naval-inspired, Razzle Dazzle design on the Silverado Special Ops Concept should make the truck pop under the lights at the Las Vegas Convention Center. Based on a Silverado 1500 Z71, the pickup is conceived as a "rescue vehicle special-operations forces." To get behind enemy lines, it packs extra LED lighting, wheel flares for off-road tires, and a GearOn utility rack in the bed. Plus to help get away, Chevy Performance fits an air intake, exhaust kit, and concept six-piston brakes. The Silverado Realtree Bone Collector Concept (above) also wears camo for SEMA, but it's for enjoying the outdoors rather than getting out of battle. Camouflage company Realtree and The Bone Collector host Michael Waddell help with the design for this custom truck that features 22-inch black wheels, a front push bar, LED light bar, and assist steps all from Chevy Accessories. With leather upholstery, Apple CarPlay, and Android Auto inside, the drive to and from the woods should be comfortable, as well. The Silverado 3500HD Kid Rock Concept rounds out this trio and features patriotic styling from the eponymous rock star. "I wanted the design for the truck to be bold, but with features and elements that wouldn't be out of reach for working-class guys," he said about the design, and Kid Rock even visited the factory in Flint, MI, to meet members from UAW Local 598 for some inspiration. The result features a custom chrome grille with a Born Free logo and chrome exhaust stacks. For added excitement, two Gibbs Sports Quadskis are hooked up on the trailer behind it. Related Video: Chevrolet Introduces Silverado Special Ops Concept Military-inspired truck reinforces capability with go-anywhere style LAS VEGAS – Chevrolet's 2016 Silverado Special Ops concept imagines a unique rescue vehicle for special-operations forces. It is based on the Silverado 1500 Z71, which features a new front-end design and new technologies built into its strong, high-strength steel body structure and fully boxed frame, and draws its design inspiration from naval design aesthetics.