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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!"

Dodge Demon's A/C helps its supercharged Hemi make more power

Staying cool is one important key to performance. Simply, more air means more power, and cool, dense air is better than hot air. While forced induction might help make copious amounts of horsepower, turbos and superchargers produce heat. Intercoolers help, but the new Dodge Demon and its supercharged Hemi need a bit of an extra boost. In Drag Mode, the Demon's engine commandeers the car's air conditioning system to help chill things out. The Demon will have the first production application of a liquid-to-air charge air cooler chiller system. Literally, the car's air conditioning system is used to cool the air going into the engine, dropping temps by up to 45 degrees Fahrenheit. Dodge claims the system helps achieve "temperatures previously unattainable by pressure-charged street-legal production vehicles." As cool as this may sound, the technology isn't new. Ford had a prototype system in the early 2000s called SuperCooler, though that system never made it to production. While the Demon's system doesn't have a super cool name like the one from Ford, the pair essentially work in the same way. In theory, it should have the same effect as a bottle of nitrous. According to Autoweek, Ford's system bumped up the output of the F-150 Lightning by about 50 horsepower. Turns out that air conditioning isn't always a huge power suck. Related Video:

Rare Dodge Shelby Dakota is a very '80s sport truck

The late-great Carroll Shelby built an incredibly successful career of making all sorts of cars faster, more often than not, with a bigger or more potent engine under the hood. The icons are well known—legends like the Shelby Cobra, GT350 Mustang, and the big GT500. But by the 1980s, Shelby was plying his trade over at Chrysler, at the behest of chairman Lee Iacocca, churning out special editions like the Dodge Shelby Charger, zippy CSX, rorty GLHS, and this—the 1989 Shelby Dakota muscle truck. 1,500 of these racy pickups were built for just one year and a whole two-and-a-half decades later they still turn heads. This one especially. The spotless pickup recently turned up for sale online , and its odometer reads a claimed 25,307 miles. So what makes these rarified work trucks special? As with most Shelbys, it starts under the hood. Up until 1989, the standard Dodge Dakota pickups were offered in only four-cylinder and V6 variants. But Dodge (and Shelby) wanted more, so the larger 5.2-liter Magnum V8 from Dodge's full-size pickup was shoehorned into the midsize Dakota, albeit not effortlessly. To fit, Dodge had to swap the V8's belt-driven fan for an electric unit mounted in front of the radiator. That did the trick, as well as earned the V8 a few extra ponies, pushing the special Dakota up to 175 horsepower and 270 lb.-ft. of torque. That performance may sound paltry by today's standards, but in 1989 it was seen as quite sporty, and netted a zero to 60 mph dash in 8.5 seconds. A four-speed automatic with lockup torque converter transmitted that power to the rear wheels. Additional Shelby performance goodies included a limited-slip differential, transmission cooler, along with a host of eye-catching body mods, including a unique air dam and bumpers, Shelby floor mats, monogramed seats and door panels, a "CS" steering wheel, 15-spoke hollow alloy wheels, and shouty body graphics. While the Shelby Dakota didn't return for 1990, its V8 legacy did continue, and in 1991 the 5.2-liter eight-cylinder became an option on new Dakotas. Of the 1,500 Shelby Dakota pickups built, 860 were dressed in red while a rarer 640 came adorned in Bright White. This '89 is said to be #245 of those white trucks, sold new to its original (and sole) owner in Mechanicsburg, Pennsylvania, for $15,985 (the Shelby package cost $3,933 in its day). Currently, it's demanding bids north of $10,000 for its low-mileage originality. Related Video: This content is hosted by a third party.