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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.

2017 GMC Acadia, tech and design, Indycar Boston | Autoblog Podcast #476

Episode #476 of the Autoblog Podcast is here. This week, Dan Roth, and guest George Kennedy talk about the 2017 GMC Acadia, this year's New England Motor Press/MIT Technology conference on the intersection of technology and design, and the failure of the efforts to bring an Indycar race to Boston. It all starts with the Autoblog Garage - check it out! Check out the rundown with times for topics, and thanks for listening! Autoblog Podcast #476 Topics 2017 GMC Acadia Tech intersecting Design Grand Prix of Boston In The Autoblog Garage 2017 GMC Acadia 2016 Toyota Highlander Hybrid 2016 BMW 750i 2016 Honda Civic Coupe Touring Hosts: Dan Roth Guests: George Kennedy Rundown Intro & Garage - 00:00 GMC Acadia - 1:00 Tech/Design - 34:13 Indycar Boston - 46:52 Total Duration: 54:22 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Feedback Email – Podcast at Autoblog dot com Review the show in iTunes

Hummer EV to be sold at only about half of GMC dealerships

The new 1,000-horsepower Hummer EV will be sold under the GMC brand, but you won't find it in every GMC showroom. Currently, just about half of GMC's dealers have agreed to take on the electric truck, Buick GMC VP Duncan Aldred told investors on a conference call last week. According to Muscle Cars and Trucks, there are a number of reasons for the irregular availability. For one, there's the cost of upgrading dealerships to sell and service a fully electric vehicle. Stores would need to be upgraded with charging stations, and service centers would require new tools and training to work on an EV. Then there's the customer experience. At $112,595, the initial Hummer EV Edition 1 caters to a different clientele than the traditional GMC truck. The planned EV3X trim level that arrives in late 2022 and EV2X arriving in spring 2023 will start at just below $100,000 and $90,000, respectively. Some sellers believe that customers paying six figures for a vehicle will expect certain niceties that will necessitate showroom upgrades as well. Complimentary doughnuts, at least. Furthermore, not all GMC dealerships are located in areas with customers willing to shell out that much cabbage for a new vehicle, especially an EV. An $80,000 base trim will be available in 2024, so perhaps more dealers will be willing to take on the truck by then. Finally, there's the Hummer EV's no-haggle pricing. Aldred was adamant on the call that customers see the same price on the internet as they do on the paperwork. It's part of the premium dealership experience that GMC wants to provide for its well-heeled clientele. Still, GMC appears to have no problem moving all the Hummer EVs it can build. Even with its lofty price tag, all Edition 1 trucks were sold out 10 minutes after GMC's announcement. Related Video: