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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

Former Fisker CEO has some advice for Tesla Motors

Former Fisker Automotive CEO and ex-Chevrolet Volt vehicle-line director Tony Posawatz has some words of caution for Tesla Motors. The long-time automaker executive questions the California automaker's long-term viability – and gives some praise – in a talk with Benzinga, which you can listen to below. While the all-wheel-drive D that Tesla unveiled earlier this month in Southern California wowed a packed crowd, Posawatz (starting at around minute 4:45 in the interview) says Tesla would've been better off taking the resources it expended toward that Model S upgrade and directed them towards speeding up the development of a more affordable plug-in. Perhaps a number of investors agreed, since the company's stock fell the day after the D was announced. Posawatz says Tesla has been over-reliant on the sale of ZEV credits. Posawatz also says that Tesla has been over-reliant on the sale of zero-emissions vehicle credits in California for its earnings and questions whether the automaker will ever work at a large enough scale to sufficiently drive down costs and make consistent profits. Tesla CEO Elon Musk would take issue with this characterization. Posawatz first made his mark in the plug-in vehicle world when he was the vehicle-line director at General Motors for the Volt extended-range plug-in from 2006 to 2012. Later that year, he joined extended-range plug-in maker Fisker Automotive as its CEO, though quit that job during the summer of 2013 as the company was descending into insolvency. He joined the Electrification Coalition this past March. News Source: Benzinga Green Chevrolet Fisker Tesla Electric PHEV Tony Posawatz

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.