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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 Colorado, GMC Canyon get updated tachometers due to graphical error

After James Bearing bought a Chevrolet Colorado, he noticed a discrepancy between the truck's spec sheet and the truck's tachometer: Chevrolet said 3.6-liter V6 in the little pickup produces 305 horsepower at 6,800 rpm, but the the tachometer indicates a redline at 6,500 rpm. So either he wasn't making as much power as he was promised, or the tachometer display was incorrect. Bearing said he asked Chevy about it but got no response. Until now. A General Motors spokesman said the rev limiter is indeed set for 6,800 rpm, but the tach graphics "are slightly off" in the Colorado and the GMC Canyon, and submitted an SAE horsepower certification to back him up. If you're wondering how such a thing got past quality control... well, let's just say you're not alone. GM is going to fix "the graphics on future trucks," which makes it sound like Bearing will just have to learn to live with the indicated redline he's got. He could always pretend he's driving a sleeper, with four more ponies waiting to be unlocked in the danger zone for those who dare. Related Video: Featured Gallery 2015 Chevrolet Colorado: First Drive View 38 Photos Related Gallery 2015 GMC Canyon: Quick Spin View 27 Photos News Source: Auto Guide Auto News Chevrolet GM GMC Truck gmc canyon

Sunday Drive: From a mid-engine 'Vette to a restomod RV

Automotive enthusiasts are a diverse bunch. As proof, we present last week's top posts on Autoblog, starting with some really good spy photos of the upcoming mid-engine Chevrolet Corvette. Will it be sold alongside a classic front-engine 'Vette? We have no idea, but we can't wait to find out. Up next is a pickup truck. Can't get much further from a supercar, right? At least both the Corvette and the 2019 Ram 1500 – which will debut a radical new design that appears to eschew the mini big-rig look of past Rams in favor of something more refined – are both American. Decidedly not American? The Mercedes-Benz G-Class SUV. The boxy off-road 'ute looks a heck of a lot like the old one, which is probably a good thing, but we know it'll be fancier and more luxurious than ever before. Check out the leaked images below. Also hailing from Germany, but sharing absolutely nothing else in common at all, is the Audi A4 Allroad. We've been driving this all-wheel-drive wagon for a while now, and we like it quite a bit. And, last but not least, is a 1959 bus that's been converted into an RV. Like we said, y'all certainly are a diverse bunch. Mid-engine Corvette — our clearest pictures yet 2019 Ram 1500 shows its full face 2019 Mercedes-Benz G-Class revealed in leaked photos 2018 Audi A4 Allroad Drivers' Notes Review | Wagons still rule This Mercedes O 319 restomod camper van shames your VW Microbus Audi Chevrolet Mercedes-Benz RAM Truck Coupe Minivan/Van SUV Future Vehicles Luxury Off-Road Vehicles Special and Limited Editions Performance Supercars mid-engine corvette recap sunday drive