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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

2017 North American Car, Truck, and Utility of the Year entries announced

Over 40 vehicles will compete for the 2017 North American Car, Truck, and Utility of the Year awards. If that name looks a little strange, it's because the competition added a third category. In years past, pickup trucks, crossovers, SUVs, commercial vans, and minivans competed for the same award. That's why there were occasionally weird comparisons, like last year's competition between the Volvo XC90 and Nissan Titan XD. The new format separates pickups and commercial vans into the truck contest and CUVs, SUVs, and minivans into the utility competition. A complete list of eligible vehicles is below, but here are a few highlights. For one, the entire list of entries has a luxurious lean. Of the 43 vehicles, nearly half of them are from premium brands. There are two eligible Bentleys – the Bentayga and Mulsanne – the Rolls-Royce Dawn, Jaguar F-Pace, Audi Q7, and the Mercedes-Benz GLS-, E-, and S-Class Maybach. The performance ranks are lofty, too, with the Audi R8, Acura NSX, Alfa Romeo Giulia, Mercedes SL- and SLC-Class, Porsche 718, and F-150 Raptor. The mainstream entries are just as comprehensive. From the Chrysler Pacifica to the Chevrolet Cruze to the Fiat 124 Spider to the Mitsubishi Mirage, NACTOY has covered an enormous price range with this year's contestants. Of course, these are only the eligible vehicles. They'll need to run through three rounds of judging, starting in September at NACTOY's traditional Hell, MI, test drive. The Canadian and American journalists involved in the judging will announce this year's nine finalists – three in each category – on December 6. Cars Acura NSX Alfa Romeo Giulia Audi A4 Audi R8 Bentley Mulsanne Buick Cascada Buick LaCrosse Cadillac CT6 Chevrolet Bolt Chevrolet Cruze Fiat 124 Genesis G90 Hyundai Elantra Infiniti Q60 Jaguar XE Kia Cadenza Lincoln Continental Mercedes-Benz E-Class sedan Mercedes-Benz S550 Maybach Mercedes-Benz SL-Class Mercedes-Benz SLC-Class Mini Clubman Mitsubishi Mirage/G4 Porsche 718 Boxster and Cayman Rolls-Royce Dawn Toyota Prius Prime Volvo S90 SUVs Audi Q7 Bentley Bentayga Buick Envision Cadillac XT5 Chrysler Pacifica GMC Acadia Infiniti QX30 Kia Sportage Mercedes-Benz GLS-Class Jaguar F-Pace Mazda CX-9 Nissan Armada Trucks Ford F-Series Super Duty pickups Ford F-150 Raptor Honda Ridgeline Nissan Titan half-ton Related Video: Featured Gallery Bentley Bentayga View 23 Photos News Source: Automotive News - sub.