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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.

Supercharged 2015 GMC Yukon Denali sounds evil, runs 0-60 in 4.5 seconds

Speeding along in a sports car is undoubtedly a ton of fun, but some owners need the ability to carry a lot of people and their stuff and don't want to sacrifice the ability to put the power down. The tuners over at Hennessey have that demographic covered with their growling, supercharged power kits for the GMC Yukon Denali. The upgrades come in three forms for the SUV's 6.2-liter V8: HPE550 with 557 horsepower, HPE600 with 605 hp and HPE650 with 665 hp. This video showcases the full-bore version, and this Denali can definitely hustle in a straight line. The power bump comes courtesy of a 2.9-liter supercharger, intercooler and high-flow cylinder heads to add over 200 horsepower compared to stock, and the final result is a bellowing SUV that rears up off he line to throw the driver back into the seat. The sprint to 60 miles per hour lasts just 4.5 seconds. Check out this hasty hauler in action in the video above.

Second part of Forza Horizon 3 car list revealed early

We previously brought you the first portion of Forza Horizon 3's list of 350 cars last week, and today we're bringing you part two. Apparently Fairfax Media in Australia had the list and images early and published them on The Sydney Morning Herald's website . We say early because the publication's story reveals that Playground Games, the developer of the game, plans to make the official announcement on the Forza website this Wednesday. This set of virtual machinery brings us closer to the full list, which will continue to be revealed over the coming weeks. While this part is smaller than the first one, it still features a number of notable automobiles, including the Bugatti EB110 Super Sport, GMC Syclone and Ferrari Dino 246 GT. This list also adds more vintage Aussie machines, including the very cool 1974 Holden "Sandman" HQ panel truck. Fans of the Mad Max movies may remember Max's Sandman truck from the original film. Check out the list of new cars from The Sydney Morning Herald below and take at look their article for new images and insight on what the developers' goals were for the game. 2007 Alfa Romeo 8C Competizione 1970 AMC Rebel "The Machine" 1998 Aston Martin V8 Vantage V600 2011 Audi RS 5 Coupe 2011 BMW X5 M 1981 BMW M1 1992 Bugatti EB110 Super Sport 1970 Chevrolet Corvette ZR-1 1966 Chevrolet Nova Super Sport 2008 Dodge Viper SRT10 ACR 1969 Ferrari Dino 246 GT 1968 Ferrari 365 GTB/4 2011 Ferrari FF 1978 Ford Mustang II King Cobra 1956 Ford F-100 1991 GMC Syclone 2016 Holden Special Vehicles GTS Maloo 1951 Holden 50-2106 FX Ute 1974 Holden Sandman HQ panel van 2012 Infiniti IPL G Coupe 2015 Jaguar XFR-S 1997 Lamborghini Diablo SV 2014 Lamborghini Urus 2014 Land Rover Range Rover Supercharged 2005 Lotus Elise 111S 2013 Mazda MX-5 1990 Mercedes-Benz 190E 2.5-16 Evolution II 2013 Mercedes-Benz E 63 AMG 1999 Mitsubishi Lancer Evolution VI GSR 2008 Mitsubishi Lancer Evolution X GSR 2000 Nissan Silvia Spec-R 1977 Pontiac Firebird Trans Am 2010 Renault Megane RS 250 2008 Subaru Impreza WRX STi Related Video: News Source: The Sydney Morning HeraldImage Credit: Playground Games/Microsoft Auto News Bugatti Ford GMC Holden Technology video games forza motorsport forza horizon 3