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Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"

GM hard at work on Chevy Silverado and GMC Sierra PHEV pickups

Autoweek heard from sources at General Motors and Ford about how each automaker is addressing the dip in EV enthusiasm and sales. At General Motors, AW reports, "plug-in hybrid versions of the Chevrolet Silverado and GMC Sierra are headed to market, in a hurry." The sources gave no timeline for when the trucks might appear. GM CEO Mary Barra told analysts during GM's Q4 2023 earnings call, "Let me be clear, GM remains committed to eliminating tailpipe emissions from our light-duty vehicles by 2035, but in the interim, deploying plug-in technology in strategic segments will deliver some of the environmental benefits of EVs as the nation continues to build its charging infrastructure."  It's too soon to predict how the Chevy Silverado EV and GMC Sierra EV will fare on the market, the Silverado EV Work Truck still the only one available to customers. It might be better for GM if they're not too popular at first, the automaker's cautious EV production ramp-up and recent software setbacks responsible for some still-healthy reservation rolls. Barra said the company plans to build between 200,000 and 300,000 EVs, this year, which would clear that backlog. Heading into the end of February, with the Chevy Bolt out of the picture and additional EV pickup production pushed to 2025, our Spidey senses feel those are optimistic numbers. The Chevy Bolt was the third-best-selling EV in the U.S. last year, at 62,044 units. GM didn't have another vehicle in the top ten. Furthermore, the combined sales of every EV in the top ten after the Bolt — seven models from six manufacturers — is only just over 200,000 units. The Blazer EV and Equinox EV could make it happen, but there's no way Chevy wants to rush those, the Blazer EV still in software purgatory.   The report speaks of collateral damage, GM said to have canceled an electric pickup sized below the Ford Maverick and Hyundai Santa Cruz. Automotive News said it saw the truck in January 2023, describing it as a futuristic two-door with a low roof and a 4.5-foot cargo bed. A new full-size van program supposedly got the axe as well, eliminating the plan to put a new Chevy Express and GMC Savana on a Brightdrop EV chassis. Over at Ford, AW says its sources mentioned another canceled midsizer; Ford's apparently stopped working on an EV pickup sized a bit below the Nissan Frontier.

GM removes start/stop from full-size trucks and SUVs with V8 engines

GM is removing start/stop technology from a number of its popular full-size SUVs due to the ongoing chip shortage. This follows the removal of cylinder deactivation technology from some of its trucks, which was also due to the chip shortage. GM Authority first reported the news, but we’ve just confirmed everything with a GM spokesperson.  The following 2021 model year vehicles will be affected: Chevy Tahoe, Chevy Suburban, GMC Yukon, Cadillac Escalade, Chevrolet Silverado 1500 and GMC Sierra 1500. Only versions of those vehicles built with the 5.3-liter V8 or 6.2-liter V8 and mated to the 10-speed automatic will have the tech removed from them. Only vehicles manufactured on or after June 7 will be affected. “By taking this measure, it will enable us to continue production of our high-demand full-size SUV and pickups as the industry continues to rebound and strengthen,” GM said in a statement. Those who ultimately buy one of these vehicles without start/stop technology will receive a $50 discount off MSRP for their troubles. Losing this fuel-saving tech could be a big negative for some, but we know many folks turn it off anyway. Not having to press the button to deactivate start/stop every time could actually be a positive if youÂ’re part of the camp who does that already. 2021 Cadillac Escalade Sport Platinum View 27 Photos On the downside, GM says “most of the affected vehicles will experience a minor reduction in fuel economy.” We donÂ’t have revised window stickers in hand to know how each model will be affected, but any 1 mpg reduction will be rather impactful for vehicles rated as low as these trucks already are. Any reduction will be seen in the city mpg rating, so take the kind of driving youÂ’re going to be doing into account before purchasing. When it comes to greenhouse gas compliance rules, GM says it doesnÂ’t foresee this impacting the companyÂ’s average fleet score. It also intends to begin adding start/stop back to these models as soon as possible, but there will be no retrofit effort made to fit the tech to vehicles already built without it. “Our supply chain organization continues to make strides working with our supply base to mitigate the near-term impacts of the semiconductor situation,” GMÂ’s statement reads. “GM continues to leverage every available semiconductor to build and ship our most popular and in-demand products, including our highly profitable full-size trucks and SUVs for our customers.