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GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

December sales for Chevy Volt, Nissan Leaf are what you expected

It was another month of as-expected sales for the two pioneering plug-in vehicles in the US. The Nissan Leaf is basically treading water and the new-generation Chevy Volt is getting back to old habits with a big increase in sales compared to where the car was last year. It wasn't a surprising month, but there wasn't any reason to expect a surprise. In fact, we don't suspect this trend to veer too far from where it's at right now until gas prices shoot up or Nissan introduces a new Leaf. Neither of those things is likely to happen any time soon. Let's start with the mediocre news. Nissan reported today that Leaf sales for December 2015 totaled 1,347 units. That's a 56.6-percent drop from where the Leaf was a year ago, and contributed to the all-electric vehicle's 42.8-percent drop in 2015 sales compared to 2014. This past year, 17,269 people bought Leafs, down from 30,200 who did so in 2014. The Volt sold 2,114 copies last month, bringing the plug-in hybrids 2015 total up to 15,393. That's an 18.1 percent drop from the 18,805 Volts sold in 2014. We shouldn't see the past year as a total flop for the Volt, though, since the much-improved second-generation model was introduced late in the year. In fact, if we just look at December 2015 and compare it to the last month of 2014, we see the Volt was able to post a 41.9-percent increase. It'll be quite fun to see where the Volt's numbers go in 2016. As you probably know, we'll have our complete wrap up of green car sales for you soon. Stay tuned. News Source: Nissan, Chevy Green Chevrolet Nissan Electric Hybrid ev sales

GM recalls 638,000 U.S. SUVs, trucks for unintended braking

WASHINGTON — General Motors is recalling 638,000 U.S. sport utility vehicles and pickup trucks because a wheel-speed sensor could fail and cause unintended braking, it said Thursday. The recall covers 2015-2020 Chevrolet Suburban, Tahoe, and Yukon and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. The sensor failure could result in unintended activation of the driveline protection system, and cause unintended braking of the wheel on the opposite side of the failed sensor. That could cause the vehicle to pull to one side unexpectedly, increasing the risk of a crash, the Detroit automaker said. GM said it was not aware of any crashes relating to the issue but found 150 field claims alleging the condition caused unintended braking or lateral vehicle motion. A GM dealer in May submitted a warranty report relating to the issue in a 2018 GMC Yukon, and two days later, a GM brand quality manager submitted the report to GMÂ’s Speak Up For Safety program that tracks potential safety issues, which prompted a GM investigation and testing. Recalls Chevrolet GM GMC Truck SUV