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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

Submit your questions for Autoblog Podcast #313 LIVE!

We record Autoblog Podcast #313 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
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New auto loans could soon extend out to 84 months

Cars and trucks are more expensive than ever before. In order to boost sales and help consumers afford new vehicles, automakers are offering longer and longer terms for auto loans. This past week, Bloomberg reported that FCA's Ram Trucks division is currently offering the longest loans. Some stretch to 73 months. Jeep, Fiat and Chevy aren't far behind. More noteworthy is that we'll likely soon see lenders moving from 73-month to 84-month loans. That's seven years worth of interest. More than two-thirds of US auto sales come from light trucks like the Ford F-150, Chevy Silverado and Ram 1500. The average transaction price of a new vehicle is well over $30,000. It's not difficult to spec out a heavily-optioned truck up to $60,000. Vehicles depreciate from the moment they roll off a dealer lot, and these six or seven-year loans could hurt consumers and lenders both in the long run. The U.S. Senate voted last week to kill rules that would prevent discriminatory auto lending. These Obama-era guidelines were meant to curtail lenders who offered higher loans based on race, religion, sex or national origin. Related Video: News Source: Bloomberg Chevrolet Fiat RAM Car Buying car loan car values