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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

Supercharged 2015 Chevy Corvette Z06 takes the C7 beyond the ZR1

The Z06 is just about everything we got in the last ZR1, but better.
After a bright-yellow false start, here is the real thing: the fourth-generation, 2015 Corvette Z06. If Chevrolet makes a ZR1 version of the C7 Corvette, it's going to be absolutely mega, because the Z06 is just about everything we got in the last ZR1, but better.

2019 Chicago Auto Show Truck Roundup: Toyota, Ford, Chevy and Ram bring it

The 2019 Chicago Auto Show features an array of heavy-duty trucks, smaller trucks, other kinds of trucks, and well, more trucks. That means new versions of the 2020 Chevy Silverado Heavy Duty and 2020 Ford F-150 Super Duty, a refreshed 2020 Toyota Tacoma and a trick tailgate on the 2019 Ram 1500. Sound a little crazy? Morgan Stanley research says 68 percent of passenger vehicles sold in the United States last year were classified as light trucks. So actually, bring on the trucks! Here's some impressions on the Chicago reveals, plus our take on the 2020 Subaru Legacy sedan. — Toyota updated the 2020 Tacoma with some light but useful enhancements. An improved infotainment has new audio features and larger screens. The grilles and wheels are different, but nothing drastic. Toyota still offers nice differentiation across the Tacoma lineup, and the design tweaks are subtle but thoughtful. Toyota tends to stretch out the Tacoma's generations, so it's wise to keep modifying and iterating to keep pace in this competitive segment. — Staying with Toyota, the Land Cruiser Heritage Edition is a legit special model that fans of this historic nameplate will appreciate. An anchor of the Toyota line in the United States since 1958, the Land Cruiser's roots date to Toyota's 1951 BJ Series military vehicle. Two colors, Midnight Black and Blizzard Pearl, are exclusive to this model and look slick against the blacked-trimmed grille and lightly bronzed wheels. Inside, bronze stitching is used on the steering wheel, seats, center console and other parts. The best part? Land Cruiser spelled out in script on the rear pillar. It's a limited model (1,200 units) and pricing isn't out yet, but that badge is probably why you buy this SUV. — The 2020 Chevy Silverado HD gets imposing looks that differentiate it from the light-duty range, an eye-popping max towing capability of 35,500 pounds and some updated powertrain elements. A new gas-fed V8 that serves as the entry point is one of the highlights, and the 6.6-liter mill makes 401 hp and 464 lb-ft, up significantly over the old 6.0-liter. There's also a new Allison 10-speed transmission teaming with the Duramax diesel to achieve that lofty max towing figure. With an updated trailering system and a larger cabin, the Silverado HD range is comprehensively remade to fight Ram and Ford. — The 2020 Ford Super Duty is also redone, and like the Chevy line, it gets a new gas V8 checking in at 7.3 liters.