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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

2016 Chevy Camaro performance figures released

If you want to make a car faster, there are two sure-fire ways to get the job done – add power and/or reduce weight. Chevy has done both for the 2016 Camaro, putting as much as 455 horsepower into its muscle coupe and shaving a few hundred pounds from every trim. That range-topping power comes courtesy of a 6.2-liter V8 engine, and it's enough grunt to push an automatic-equipped Camaro SS to 60 miles per hour in just 4.0 seconds flat (4.3 seconds with a manual) and down the quarter mile in 12.3 seconds at 116 mph (12.5 at 115 for the stick). Not coincidentally, those acceleration specs, at least on paper, put the V8-powered Camaro SS just above the Mustang GT on the muscle-car pecking order. When the road gets twisty, Chevy claims the Camaro SS can generate as much as .97 g on the skidpad. And, thanks in part to its Goodyear Eagle F1 summer tires, the SS can stop from 60 in as little as 117 feet. We look forward to finding out how nimble the new Camaro feels when compared to its primary competitors. <p>Your browser does not support iframes.</p> Moving down one notch to the 335-hp 3.6-liter V6, properly equipped 2016 Camaro coupes can hit 60 in as few as 5.1 seconds and cover the quarter in 13.5 at 103. Perhaps even more intriguingly, the 2.0-liter turbocharged four-cylinder and its 275 horsepower (the only configuration quicker with a manual transmission, incidentally) can propel the Camaro to 60 in 5.4 seconds and through the 'ol 1320 in 14 seconds flat. That's seriously quick, but buyers comparing the Camaro to the Mustang will find that the EcoBoost 2.3-liter is a bit more powerful (310 hp and 320 lb-ft) and quicker (5.1 seconds to 60). Chevy is making lots of noise about the efforts its engineers went through to shed weight from the 2016 Camaro, going so far as to shave down suspension bolts so that no thread went unthreaded. The weight-saving obsession pays off – base Camaro models are down 390 pounds while the SS model drops 223 pounds over the 2015. The 2016 Camaro SS boasts a power-to-weight ratio of 8.1 lbs per pony, a 14-percent improvement over the last-gen. Even though weight is down, chassis stiffness is said to be up by 28 percent over the fifth-gen Camaro coupe. Also of note: The Camaro is now lighter than the Mustang across the board when comparing like-to-like configuration levels. The 2016 Chevy Camaro starts at $26,695 (including $995 for destination).

Junkyard Gem: 1985 Chevrolet Sprint

For in the 1985 model year, General Motors began selling Chevrolet-badged Suzuki Cultus hatchbacks in California. Sales of the cheap three-cylinder econobox in the rest of North America followed soon after (with the Canadian version known as the Pontiac Firefly), and did pretty well considering the crash in gasoline prices during the middle 1980s. Starting in 1988, the facelifted Sprint became the Geo (and, later on, Chevrolet) Metro. Here's one of the very first Cultuses sold on our shores, found in a San Francisco Bay Area car graveyard. Amazingly, the primitive rear-wheel-drive Chevrolet Chevette remained available all the way through 1987, competing with the thriftier front-wheel-drive Sprint in the same showrooms. For 1988, Pontiac started selling a rebadged Daewoo LeMans, so the Sprint/Metro never lacked for intra-corporate competition. Inside, you'll find the same stuff most mid-1980s Japanese econoboxes got: tough cloth upholstery and long-wearing hard plastics. Suzuki quality in 1985 wasn't quite up to Honda or Toyota levels, but you weren't paying Honda or Toyota prices for the Sprint. MSRP on this car started at $4,949, or about $12,000 in 2020 dollars. The cheapest possible 1985 Chevette cost $5,340, while a new no-frills Ford Escort would set you back $5,620. Subaru, however, could have put you in a punitively unappointed base-model Leone hatchback for just 40 bucks more than the Sprint that year. I think I'd have sprung the extra for a $5,348 Toyota Tercel, a $5,195 Mazda GLC, or— best cheap-commuter deal of all that year— the $5,399 Honda Civic 1300 hatchback. I was 19 years old and driving a Competition Orange 1968 Mercury Cyclone that year, and I recall feeling pity for Chevy Sprint drivers, new-car smell or not. Still, these weren't bad cars for the price, though a Sprint with an automatic transmission was a real character-builder. Got three cylinders and uses 'em all! 48 horsepower from this hemi-headed SOHC 1-liter. The Turbo Sprint — yes, such a car existed — had a howling 70 horsepower. The hood-latch release is a rectangular button that resembles a badge. 1985 Chevy Sprint Commercial The highest-mileage, lowest-priced car you can buy. 1985 holden barina commercial The Australian-market version was the Holden Barina, and the TV ads featured the Road Runner. 1983 SUZUKI CULTUS Ad In its homeland, this car got screaming guitars and a drive through New York City for its TV commercials.