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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 Bolt wins 2017 Green Car of the Year

We knew that a plug-in vehicle was going to win the 2017 Green Car of the Year award this year, given that all five finalists have a way to charge up. And when Ron Cogan, the editor and publisher of Green Car Journal, announced the winner – the 2017 Chevy Bolt EV – he said that the car itself represents one of those times in the auto industry when everything is about to change. Similar to the invention of the starter motor, things are about to get different. For now, though, the fact that the Bolt EV won an award sounds like the same old thing all over again. Just this week, it was named Motor Trends Car of the Year and to the Car And Driver Top 10 list. The other four finalists for Green Car of the Year included the Toyota Prius Prime, the Chrysler Pacifica, the Kia Optima (including hybrid and plug-in hybrid models) and the BMW 330e iPerformance. Last year, the winner was the 2016 Chevy Volt. Did Green Car Journal make the right selection this year? See the award ceremony below.

Best Large SUVs of 2024

When it comes down to large SUVs, there's more to consider than price and just how large it is. First, it comes down to what's underneath the skin. Some are built on a truck-like body-on-frame chassis — this would be the traditional, literal definition of an "SUV." Others use car-like, unibody construction, which would make them a crossover. What really matters, though, is how you use them. For most American families, a large three-row crossover is going to be your best bet. They have loads of passenger and cargo space, and deliver superior fuel economy, handling and ride quality than those big traditional SUVs. They're cheaper, too. On the other hand, those traditional large SUVs like the Chevy Tahoe and Ford Expedition are better-suited for more heavy-duty tasks like towing. Most now have bigger third rows than big crossovers, while extended-length versions like the Chevy Suburban have way more cargo capacity behind their third rows than everything but an airport shuttle. As for luxury large SUVs, they fall into those same two categories as well, with American choices mostly being truck-based. The pros and cons of choosing one over another are similar. Below, you will find our list of the best large SUVs broken down into three categories: large family crossover, large traditional SUV and large luxury SUVs, which comprise both construction types.  Best Large Family Crossovers  |  Best Large Traditional SUVs  |  Best Large Luxury SUVs Best Large Family Crossovers 2024 Honda Pilot Why it stands out: Exceptional storage and cargo space; unique second-row functionality; refined ride; versatile and capable TrailSport; advanced AWDCould be better: Subpar acceleration with lackadaisical transmission and engine response; so-so driver assistance tech Read our full 2024 Honda Pilot Review The Honda Pilot was completely redesigned for 2023. It maintains its predecessor's family-friendly packaging and overall focus, but it has injected a welcome sense of style (especially in the TrailSport pictured above) that makes it stand out much better from the big crossover crowd. The Pilot's restrained adornment and classic proportions are refreshing compared to the increasingly busy Kia Telluride, Hyundai Palisade and Subaru Ascent. Let's talk about practicality, though, which is ultimately the Pilot's best attribute.