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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.

GM: Without LG Chem, we couldn't build Bolt EV [UPDATE]

It's absolutely no surprise that General Motors has a thing for LG Corp. The Detroit automaker and the Korean parts supplier have been working in public on electric vehicles ever since it was announced that LG Chem would supply the battery cells for the Chevy Volt in 2009. LG Chem was even named GM's 2010 Supplier of the Year. But, yesterday, the connection between the two companies was strengthened with the announcement that LG Electronics would be supplying a number of components for the upcoming Chevy Bolt electric vehicle. The Bolt is expected to be able to go about 200 miles and will carry a price tag of about $30,000 (after incentives) when it arrives in 2017 or so. LG's new components can be found almost everywhere in the Bolt. They include the battery pack and the battery heater, a new motor, the power inverter module, the electric climate control system compressor, the on-board charger, high-power distribution module, the accessory power module, and power line communication module. Oh, and then there are LG Electronics' advanced display technologies like the new instrument cluster and a new infotainment cluster. LG Electronics also supplies parts for the 4G LTE OnStar system, just like it does in other new Chevys. If that all sounds like a lot of components to you, you're right. Mark Reuss, GM executive vice president of global product development, purchasing and supply chain, said that without the expanded relationship with LG, GM would not be able to bring the Bolt to market (insert old ironic quote link here). "I think GM was lacking that [electrification knowledge] in a very complete way for many years, I'll just be frank about that," Reuss said. "I also think that on an electrified basis, this requires a long-term commitment and trust that sometimes is violated on a more short-term, regular, traditional basis. I think we have found something completely different with LG and I think that has become a widely talked about and duplicated want from our purchasing and corporate standpoint with our supply base." The "this" that Reuss is talking about here is the OEM-supplier relationship, something has evolved with the LG-GM situation. Previously, the automaker-supplier relationship used to be more like a dictator telling underlings what he needed, Reuss said, and that was a bad idea. "Today's competitive landscape requires a different approach, especially in electrified vehicles," he said.

It won't be long now before Nissan Leaf finally overtakes Chevy Volt

The two best-selling plug-in vehicles ever are the Chevy Volt and the Nissan Leaf. When the two vehicles launched in late 2010, the plug-in hybrid Volt quickly outpaced the all-electric Leaf and, despite lots of ups and downs since then, continues to hold on to a cumulative sales lead. This will change in 2015. Cumulatively, from November 2010 through November 2014, the Volt sold 71,867 units while the Leaf trails with 69,220. That's a difference of just 2,647. Based on current trends (with the Leaf selling around 2,500-2,700 a month and the Volt at 1,500-1,700) we expect the Leaf to take over either in January or, more likely, February when the Leaf takes over as the most popular plug-in car in America. Perhaps even March, depending on how low the numbers are for January and February, which are always slow sales months in the US. Of course, once it takes the crown, the Leaf can't expect to easily hold on for long. A new Volt is coming in the second half of 2015, likely beating a new Leaf to market. The question is, then, how well the Chevy sells with all of its new bells and whistles. Do you think the Volt will be the comeback kid once the 2016 model becomes available? Featured Gallery 2013 Nissan Leaf View 55 Photos Green Chevrolet Nissan AutoblogGreen Exclusive Electric Hybrid ev sales hybrid sales