4x4 Duramax Diesel -- Low Miles -- Leather -- Rims -- Clean Carfax! on 2040-cars

Auto blog

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

Nissan Leaf has outsold Chevy Volt by 50% so far in 2015

We know, we know. The Chevy Volt and Nissan Leaf sales numbers for mid- to late-2015 aren't all that meaningful because of the impending arrival of the next-gen Volt and the expected but not-yet-totally-confirmed debut of the second version of the Leaf. Nonetheless, tracking the sales of the first two major plug-in vehicles is something that remains interesting to us, if for nothing else that the all-electric Leaf remains slightly more popular than the plug-in hybrid Volt after all this time. If we just look at August, the numbers were basically tied in the US. Chevy sold 1,380 Volts while Nissan moved 1,393 Leafs. But when we take a 10,000-foot view, the differences starts to appear. So far in 2015, GM has sold 8,315 Chevy Volts while Nissan has sold 12,383 Leafs. That means that the Nissan has outsold the Chevy by around 50 percent (to be specific, it's 48.92 percent). Since the two vehicles went on sale in the US at roughly the same time at the end of 2010, 81,672 Volts have been sold, compared to 84,705 Leafs. That's a difference of only 3,033 vehicles, so proponents of both powertrains can hold their heads high. Looking just at last month, Volt sales were 45 percent lower compared to August 2014. So far this year, Volt sales are down 36.7 percent. The Leaf didn't fare any better. Month-to-month, Leaf sales were down 43.7 percent in August, while year-to-date, Leaf sales are down 65.3 percent. Those second-gen models can't come soon enough. As always, we'll have our broader wrap-up of monthly green car sales for August up soon. Stay tuned. Green Chevrolet Nissan Electric Hybrid ev sales

Chevy Corvette is latest car breached by hackers

UPDATE: This story has been updated with comment from General Motors. In the latest car-hacking exploit in a summer full of them, researchers from the University of California-San Diego say they've found a way to manipulate braking in a 2013 Chevrolet Corvette. The vulnerabilities may not be limited to that model. Cyber-security researchers breached the car's security systems via a device they had plugged into the Corvette's OBD-II port, and through that connection, they sent messages that could turn windshield wipers on and off and tamper with the brakes as the car drove at low speeds. It's the latest in a series of car hacks that involve access to critical systems obtained via the OBD-II port, where drivers can plug in devices that provide anything from diagnostic information for mechanics to driving information for insurance companies. Last November, cyber-security engineers from Argus Cyber Security remotely controlled vehicle functions in a car that had a OBD-II dongle called a Zubie installed. In January, researchers from Digital Bond Labs found security holes in an information-tracking dongle popular with more than 2 million Progressive Insurance customers. Those came before prominent hacks unveiled in recent weeks, in which researchers remotely commandeered control of a Jeep Cherokee and, separately, showcased problems with GM's OnStar infotainment system. Regarding the dongles that plug into the OBD-II ports, Stefan Savage, a Cal-San Diego professor involved in the research, tells WIRED that, "we acquired some of these things, reverse-engineered them, and along the way, found that they had a whole bunch of security deficiencies." Savage and others unveiled the latest study at the Usenix security conference Tuesday. In a video of their exploit entitled "Fast and Vulnerable," they show how they sent SMS messages from a smartphone to the dongle plugged into the car's OBD-II port. From there, their messages accessed the CAN bus, a network on the car that connects individual electronic control units, which control dozens of vehicle functions. As they send the commands to brake the car, the driver of the Corvette notes "the pedal doesn't react to any pressure." General Motors issued a written response Wednesday, warning drivers to be careful with third-party devices they plug into their OBD-II ports.