1999 Ford Escort Zx2 Cool Coupe Coupe 2-door 2.0l on 2040-cars

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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!"

Which is more fuel efficient, driving with a pickup's tailgate up or down?

Thanks to the smoke wand in the wind tunnel, you can actually see the difference in our video.
Should you drive with your pickup truck's tailgate up or down? It's an age-old controversy that's divided drivers for decades. Traditionalists will swear you should leave the tailgate down. Makes sense, right? It would seem to let the air flow more cleanly over the body and through the bed. But there's also a school of thought that argues trucks are designed to look and operate in a specific manner, and modern design techniques can help channel the airflow properly. So don't mess with all of that: Leave the tailgate up.

Next Shelby Mustang to wear GT350 nameplate

Earlier this month, rumors started to swirl 'round the web about the next-generation Ford SVT Mustang - the halo version of the all-new 2015 'Stang seen testing in the gallery above. Originally, we heard that the Shelby GT500 moniker would be dumped in favor of "a name you're familiar with," which some sources guessed could mean a return of the Cobra nameplate.
That might not be correct. According to Road & Track, citing a report from Mustangs Daily, the new range-topping Mustang will bring back the Shelby GT350 name - currently used on an aftermarket version of Ford's Pony produced by Shelby American (take a look at our recent Quick Spin of that car). Expect the new GT350 to be quite a bit different than the current GT500 - it will be all motor, using a V8 that's derived from the naturally aspirated 5.0-liter Coyote engine (though it will no doubt have a higher displacement). The GT350 will be a lot more powerful than the next Mustang GT, which is expected to offer something like 450 horsepower, but won't be quite as absurd as the 662-horsepower GT500 we currently enjoy.
The Shelby GT350 will reportedly bow with the rest of the new Mustang range at the 2014 New York Auto Show, which coincides exactly with the original Mustang's debut at the New York World's Fair in 1964. If that seems far out, don't worry, we'll be seeing the rest of the 2015 Mustang range before then, but Road & Track reports that the 2014 Detroit Auto Show stage will be reserved for the reveal of the next Ford F-150 pickup.