Seven-oh-seven. Not since the famed Boeing jetliner of the same name has the public been so tantalized with the number 707. With Mopar claiming the new 2015 Dodge Challenger SRT Hellcat makes 707 hp, we thought it was time to put it and the 580-hp 2014 Chevrolet Camaro ZL1 on the chassis dyno at K&N Engineering's Riverside, California, shop.
Our eight-speed automatic-equipped Challenger Hellcat was the first to hit the rollers. Dodge says the Hellcat's 6.2-liter supercharged V-8 produces an SAE-certified 707 hp and 650 lb-ft of torque at the crank. That's a lie. It produces more -- much more, even, depending on what sort of drivetrain loss you're assuming. According to K&N's dyno results, the Challenger SRT Hellcat puts down 635 hpand 591 lb-ft of torque at the rear wheels. Assuming a 12-percent drivetrain loss (automatics are getting more efficient each year), that means the Hellcat puts out about 722 hp at the crank. As for torque, well, the Hellcat makes more than advertised there as well -- 672-lb-ft, which might help explain the set of rear tires we burned through
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