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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

Chevrolet SS previewed by Holden VF Commodore SS V show car

It won't be long before we see the official, production-ready Chevrolet SS sedan (hint: it will be revealed this weekend). And to tide us over until all of the official details are released about the US-spec version, we have this: the Holden VF Commodore SS V show car, a performance-oriented brother to the Calais V that debuted earlier in the week.
What we really want to know about the SS V is what lies underhood, but General Motors' Australian arm is keeping that under wraps until the Chevy model breaks cover this weekend. Nevertheless, it's obvious that the SS V will be a serious performer, with all sorts of aggressive cues driving that home on the car's exterior. Take a look at those 20-inch billet aluminum wheels that hide big Brembo brake calipers up front, the sculpted hood and front fascia, the wide air intakes with LED running lights and the quad exhaust pipes out back. It's like the Pontiac G8 GXP never even left us.
Inside, there's a sporty-looking interior with aluminum accents that mix in with black leather and suede surfaces, all tied together in the middle with an eight-inch MyLink touchscreen infotainment system. It looks great, and again, while we don't know anything regarding powertrain details, it makes us oh-so happy to see a manual shifter smack dab in the middle of the center console.

Autoblog In Cuba: 1957 Chevy Bel Air Review

If you've been following the Autoblog In Cuba series, you may remember that my efforts to rent a car in the country were ultimately unsuccessful. Misinformation, bad planning, and a lack of rental car inventory conspired to disrupt my hoped-for driving adventure. I discovered in my week of exploration, however, that the terrific thing about Havana is that there's always another adventure to be found – if you're willing to look. A car I could drive myself might have been impossible to come by, but a ride to remember was not. After all, even when reviewing a new car, I've found that impressions about the car and the route can be credibly formed from the right seat. Starting from the parking lot of the grand Hotel Nacional, finding an interesting car for hire is as simple as walking up and down the block. Scads of classic American iron wait just outside the hotel gates, in a riot of colors and conditions befitting the tropical climate. Fords from the 1940s are plentiful – more sedans than coupes – and the glory days of General Motors are represented by enough Pontiacs and Cadillacs to fill a Bruce Springsteen B-sides album. But the Chevy Bel Air is the king of the road here, by some margin. View 30 Photos I settled on a burnt orange 1957 Chevy Bel Air convertible, in tourist-appropriate condition. I was looking for a hardtop at the request of my crew's audio/video needs, but settled on a burnt orange 1957 Chevy Bel Air convertible, in tourist-appropriate condition. This car might look good as a prop in the background on your vacation photos – hair blowing in the breeze with the ocean at your back, parked in front of Che's face in Revolution Square, etc. – but was far from pristine on a closer inspection. A perfect representative of the Cuban average. At least the price was right: $50 for two hours to make it 12 miles to Hemingway's house, and back. My driver was a kid named Daniel who looked to be about 20 years old. The Chevy doesn't belong to him, he co-drives it with the owner, but he was able to give me the basic mechanical rundown. The eight- or six-cylinder engine that Chevy shipped this convertible with was long gone. No surprise there, as nearly every American-made car I'd ridden in so far was powered by some belching Mercedes diesel. Despite it's clattering note, Daniel said the lump under the hood of the '57 drinks gas: a four-cylinder of Russian origins, pulled out of a GAZ Volga as best I can understand.