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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

Ranking full-size pickup trucks by the size of their discounts

Each and every month, full-size pickup trucks dominate the new-car sales reports in America. It's been that way for years — the Ford F-Series has been America's best-selling vehicle for 38 consecutive years — and it's not going to change any time soon. With that in mind, we've compiled this list of discounts on brand-new full-size pickup trucks using data provided by Truecar, including their average retail prices, average transaction prices and discounts in dollars and percentage off list price. We've also created a visualization of the best deals Americans are scoring on the three best-selling models in America. If you're looking for the absolute biggest discount you can find on a new truck, look no further than your nearest Ram dealership, then scour the lot for a leftover 2019 1500 model. Buyers are averaging nearly 13% off the cost of the 2019 Ram, paying an average transaction cost of $41,667. That's $6,071 off the average retail price, which equals the best truck deal in October. The 2020 edition isn't discounted nearly as far, averaging $2,852 off for an average transaction price of $48,904. The next best deal is on the 2019 Ford F-150; its average transaction price of $43,064 equals $3,843 off its sticker price. The 2020 F-150's $2,810 discount means buyers are paying around $47,300. They should know, though, that a brand-new model is coming for 2021, so we'd expect bigger discounts on remaining 2020 inventory in the coming months. Moving to General Motors, the best deal you'll find is on leftover 2019 Chevy Silverado 1500s, which are selling for an average of $47,043. That's $2,852 off the sticker price. Interestingly, 2020 Silverados are seeing slightly lower transaction prices at $46,009, but with a smaller average discount of $1,693. The 2020 GMC Sierra is mechanically similar to the Chevy, but aimed at buyers who want a bit more luxury. That's reflected in the 2020 Sierra 1500's average transaction price of $54,491, which is $2,131 off its sticker. If pickup trucks aren't your thing, take a look at this list of the best new car deals in America based on the percentage discount off their suggested asking prices here. And when you're ready to buy, click here for the Autoblog Smart Buy program, which brings you a hassle-free buying experience with over 9,000 Certified Dealers nationwide.

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