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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

NHTSA probes 2010 Chevy Tahoe for side airbag issue

After a person was killed in a rollover accident in a 2010 Chevrolet Tahoe in Texas in 2011, the National Highway Traffic Safety Administration is considering whether to conduct a deeper investigation into a potential problem with the model's side airbags. According to the petition filed with the government agency, the SUV's rollover side curtain airbag deployed in the accident, but the design allegedly still allowed some of the occupants in the second- and third-row seats to be ejected from the vehicle. One of them died in the crash. Based on NHTSA's preliminary review, this is the only report of this type of incident happening in a 2007-2015 Tahoe or GMC Yukon. "GM investigated the complaint that is the basis of the petition and found no defect trend," company spokesperson Alan Adler said to The Detroit News, and said the automaker will cooperate with the feds. Still, "a defect petition has been opened to evaluate the issue and make a grant or deny decision," according to NHTSA. Depending on the agency's findings, this could lead to a full investigation and possible recall affecting an estimated 58,000 vehicles. INVESTIGATION Subject : Rollover Side Curtain Air Bags Date Investigation Opened: JUN 11, 2015 Date Investigation Closed: Open NHTSA Action Number: DP15004 Component(s): AIR BAGS All Products Associated with this Investigation Vehicle MakeModelModel Year(s) CHEVROLET TAHOE 2010 CHEVROLET TAHOE HYBRID 2010 Details Manufacturer: General Motors LLC SUMMARY: The Office of Defects Investigation (ODI) has received a petition requesting an investigation of alleged defects that can cause occupant ejections during rollover crashes in certain General Motors vehicles. The petition alleges the defects allow second and third row occupants to be ejected despite the deployment of rollover side curtain air bags. The petition cites a 2011 Texas crash involving a model year 2010 Chevrolet Tahoe, which allegedly resulted in multiple occupants to be ejected. One of the ejected occupants was fatally injured. ODI's preliminary review of its consumer complaint data found no similar reports of occupant ejections on 2007-2015 Chevrolet Tahoe and GMC Yukon vehicles. ODI also reviewed Early Warning Reporting data submitted by General Motors. A defect petition has been opened to evaluate the issue and make a grant or deny decision.

eBay Find of the Day: Mario Andretti's personal 2009 Corvette ZR1

With victory in the the Indianapolis 500, a Formula 1 World Championship, a win in the Daytona 500 and too many other motorsports accomplishments to list, Mario Andretti stands among not just the greatest American racing drivers of all time, but the greatest drivers, full stop. Apparently, the champ is also a fan of speed when not on the track, because now there's a chance to own what is said tobe his personal 2009 Chevrolet Corvette ZR1 with just 12,872 miles on the clock. The eBay Motors auction page clearly shows Mario Andretti standing with the car, but the rest of the ad is admittedly short on details. The vehicle history report lists only one previous owner – ostensibly Andretti. The exterior is a handsome Blade Silver Metallic accompanied by a Dark Titanium leather interior. However, the seller keeps additional information to a minimum as well with the description simply stating, "This 2009 Chevy Corvette ZR1 is owned by Mario Andretti and has been garage kept all its life. It is fully loaded with all option on this car." The future buyer will get a seriously great car along with some huge bragging rights at any party by touting its ownership history. We've reached out to the seller for more particulars and provenance, and will update this story if we hear back. In the meantime, the auction for this C6 ends on Thursday, January 8, and currently the reserve isn't met. The price sits at a hefty $68,100 as of this writing, with six bids registered. Featured Gallery 2009 Chevrolet Corvette ZR1 owned by Mario Andretti Auction News Source: eBay MotorsTip: Roger Celebrities Motorsports Chevrolet Auctions Coupe Performance chevy corvette zr1