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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

2020 Chevy Trax and Buick Encore spied testing

We just recently saw a little crossover SUV from General Motors being tested, and we weren't positive what brand it belonged to. We narrowed it down to Chevy or GMC, but we're feeling more confident that it's a GMC now, since both the next generation Chevy Trax and Buick Encore subcompact crossover SUVs have been spied testing together. Of the two, the Chevy has the more radically different sheet metal. It ditches the somewhat frumpy, lumpy shape of the current Trax for a body inspired by the bigger Chevy Blazer. The roofline has sharp corners, and the hood is wide and flat. The front fascia, though obscured, shows the most connection to the bigger crossover. It has the same split headlight configuration, and it looks as though the grille takes up a sizable section of the fascia. View 7 Photos The Buick Encore on the other hand looks evolutionary in design. The body still has plenty of curves, and the distinctive, sharply rising window sill are all hallmarks of the current Encore design. The headlights and grille are similar, too, though the grille appears to be slightly updated to fit in with the Enclave and Regal. It's understandable that Buick might want to play it safe with the new Encore, since the model is Buick's best seller, selling about 23,000 units in the last quarter, nearly twice that of the next best performer, the Enclave. Since this is the first time we've seen these little crossovers, we expect it will still be a year or two before we get to see them fully revealed. They will probably continue to use small-displacement turbocharged four-cylinder engines with either front- or all-wheel drive. Related Video:

2016 Chevrolet Volt First Drive

There's a hit vehicle hiding in GM's formula for the Chevy Volt. You can sense it in the enthusiasm that current Volt drivers have for their cars. You can see it in the amount of money GM has poured into its extended-range electric vehicle project. And perhaps most importantly, you can feel it from the driver's seat of the new, second-gen model. The big question is whether or not GM will be able to turn its much-hyped 'halo car' into a best-seller this time around. After driving it in northern California, I can tell you that the Volt is tremendous. But we all know it takes more than that to create a hit. GM has so far sold over 82,000 Volts in the US. That's respectable, but in the early, glory days before the car launched, company representatives were talking about much more impressive numbers. With a few years to talk to customers and potential prospects, GM has learned a lot about what makes someone buy a Volt. For the 2016 model, Chevy has changed just about everything for the better. The new Volt has more all-electric range (53 miles vs. 38 in the first generation), is more fuel efficient whether you're looking at the overall value (106 combined MPGe vs. 98) or just when the car burns gas (42 miles per gallon vs. 37). All of that means that the car's overall range is bumped up to 420 miles, from 380. The battery is smaller and lighter while offering more energy capacity. The range-extending gas engine is bigger (1.5 liters vs. 1.4) but it's also more efficient and can burn regular gasoline instead of just premium. The Volt's overall range is bumped up to 420 miles, from 380. The cost is lower, too: $33,995 vs. $34,170, before incentives. This is a car that GM thinks will compete against the Toyota Priuses and Nissan Leafs of the world (as its new ads make abundantly clear). All three cars have completely different powertrains, but we all know that they're the headline green cars of our time (along with Tesla), so buyers will have to want to pony up a bit more money if they like what the Volt is offering. The 2016 Leaf with its 107-mile range starts at $37,640 (before incentives), while a 2015 Prius can be had for $25,035 (pricing for the 2016 has not yet been announced). So, on paper, the new Volt is an all-around winner. I'm here to tell you that it wins on the road, too. You can't help but notice the changes. They are literally front and center.