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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

Watch Evo pick its 2015 Car of the Year in this epic video

With just a few days left in 2015, it's the perfect time to check out Evo's annual Car of the Year test to determine the greatest performance vehicle of the last 12 months. The writers' picks for the 11 finalists spanned a breadth of engaging models and included: Peugeot 208 GTi by Peugeot Sport, Lamborghini Aventador SV, Seat Leon Cupra Sub8, McLaren 675LT, Porsche 991 GT3 RS, Porsche Cayman GT4, Honda Civic Type R, Ferrari 488 GTB, Chevrolet Camaro Z/28, Lotus Evora 400, and Mercedes-AMG GT S. For the venue to test the mettle of these performance machines, Evo stuck close to home this year and visited the twisting roads at the beautiful north coast of Scotland. Racing brothers Marino and Dario Franchitti also came along for the ride to provide two more voices in the competitive challenge to determine a winner. Evo's video explains why each model deserves to be among such rarified company but doesn't gloss over their faults either. There can be only one winner, though. We don't want to spoil it, so check out the clip for magnificent views of these performance machines through the Scottish countryside.

GM recalling 15k midsize pickups over leaky brakes

General Motors has announced a recall in coordination with the National Highway Traffic Safety Administration related to the brakes on the 2015 Chevy Colorado and GMC Canyon. In the 14,838 units in the United States estimated to be affected, the front brake calipers may be leaking fluid. Needless to say, that could make them less effective, which could hinder the vehicle's ability to stop in time to avoid a collision. The affected units were all manufactured between January 6 and December 24, 2014. The fix seems simple and straightforward enough, with dealers being instructed to inspect the front brake calipers, and replace them if necessary. See below for all the details from NHTSA. RECALL Subject : Brake Fluid Leak Report Receipt Date: MAY 12, 2015 NHTSA Campaign Number: 15V278000 Component(s): SERVICE BRAKES, HYDRAULIC Potential Number of Units Affected: 14,838 Manufacturer: General Motors LLC SUMMARY: General Motors LLC (GM) is recalling certain model year 2015 Chevrolet Colorado, and GMC Canyon trucks manufactured January 6, 2014, to December 24, 2014. The affected vehicles may experience the front brake calipers leaking brake fluid. This is due to air pockets, an imperfection in the metal caliper body. CONSEQUENCE: If the vehicle experiences a brake fluid leak it can increase the stopping distance, increasing the risk of a vehicle crash. REMEDY: GM will notify owners, and dealers will inspect and replace the front-brake calipers if necessary, free of charge. The recall is expected to begin July 10, 2015. Owners may contact GM customer service at 1-800-222-1020 (Chevrolet), or 1-800-462-8782 (GMC). GM's number for this recall is 14888. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov. Related Video: Featured Gallery 2015 Chevrolet Colorado: First Drive View 38 Photos News Source: National Highway Traffic Safety AdministrationImage Credit: Copyright 2015 Seyth Miersma / AOL Recalls Chevrolet GMC Truck gmc canyon brakes