1948 Chevy Pickup Wrecker / Tow Truck on 2040-cars

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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

Junkyard Gem: 1987 Chevrolet Turbo Sprint

Fifteen years ago, I wrote my first-ever automotive article under the name Murilee Martin, and it didn't take me long to start writing about one of my favorite automotive subjects: the junkyard. Before I'd refined my system for documenting discarded vehicles, however, I shot a lot of boneyard photos that never got used. For today's Junkyard Gem, I have four shots from early 2007 of one of the rarest turbocharged machines of the 1980s: the Chevrolet Turbo Sprint. The Chevrolet Sprint was really a rebadged Suzuki Cultus, from the pre-Geo era when General Motors sold the Isuzu Gemini as the Chevrolet Spectrum, the Daewoo LeMans as the Pontiac LeMans and the Toyota Corolla as the Chevrolet Nova (soon enough, the Spectrum became a Geo, and the Nova became the Prizm). The second-generation Cultus appeared in 1988, becoming the Geo Metro on our shores the following year. The Turbo Sprint was available for just the last two years of the Sprint's 1985-1988 American sales run, and it appears that just a couple of thousand were sold; if I'd known at the time just how rare they were, I'd have shot more photos of this one at the now-defunct Hayward Pick Your Part. The turbocharged 993cc three-cylinder produced 70 horsepower, 22 better than the naturally-aspirated version. Since the Turbo Sprint weighed just 1,620 pounds (that's about 500 pounds lighter than a barely more powerful '22 Mitsusbishi Mirage), it was plenty of fun to drive. For 1988, the regular Sprint hatchback cost $6,380 while the Turbo Sprint listed at $8,240 (that's about $15,375 and $19,855 today, respectively). Believe it or not, a Turbo Sprint actually raced in the 24 Hours of Lemons 10 years ago, though it didn't end well. This ad is for the regular Cultus, not the Cultus Turbo, but the screaming guitars sound reasonably turbocharged. For the most part, Chevy Sprint marketing was all about cheap purchase price and stingy fuel economy… at a time when gasoline prices were cratering. Related Video:

OnStar to offer 90-day driving assessment, possible insurance discount

General Motors has announced a brace of new features for OnStar, two of which could help you save money assuming you're willing to sign over some (more) personal details. The first is a driving assessment program in which OnStar takes note of certain driving parameters for 90 days, then provides the driver feedback on their driving, both individually and when compared to other drivers in the program, as well as driving tips. Think of it as OnStar's ICE version of the Nissan Leaf's CARWING feature that compares how efficient your electric driving is compared to other BEV drivers. In this case, though, certain drivers will have the chance to share their assessment with Progressive Insurance, and if the numbers are right they might get a "driving-based" discount from the insurance company. The assessment program is voluntary, and requires opting in. It will be available this summer on all new GM cars and some GM vehicles back to 2013. In case this sounds like Big Brother, let's not forget that Big Brother is already here and moved in so long ago that he's a member of the Kiwanis club and is hosting neighborhood block parties. Progressive already has a million enrollees in a program called Snapshot that tracks OBD II data to offer usage-based insurance to provide annual pricing based on how much you drive your car, with discounts of up to 30 percent. The OnStar effort is just another way to do that. The second feature is proximity offers through AtYourService, which notifies drivers to deals and information on their driving route and provides coupons from RetailMeNot and Entertainment Book. Beyond that, a deal with Priceline will let OnStar agents book hotels for you starting this year, there's a tie-in with Dunkin' Donuts, too, but we're fuzzy on those benefits, and third new feature lets Chevrolet owners know when certain parts need replacing. News Source: Detroit NewsImage Credit: AP Photo/Carlos Osorio Chevrolet GM Technology