• Jul 16, 2008


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There's horsepower, and then there's dyno-tested, can't-lie-to-your-friends horsepower. If you want to know how much power a car really makes, you've got to strap it to a dyno and spin it to redline. The guys over at 5.0 Mustang & Super Fords are always eager to find the true horsepower of a car, and so when they took delivery of a GT500KR to review they headed straight to the dyno to see how much power the supercharged V8 is putting out. What they found was somewhat surprising -- the KR produced 509 horsepower and 467.7 lb.-ft. torque to the wheels. Adjusting for an estimated driveline loss of 15 percent, the actual output at the flywheel is 589.82 hp and 550.24 lb-ft torque -- nearly 50 more horsepower and 40 more lb-ft than Ford is claiming. Take that Z06!


[Source: 5.0 Mustang & Super Fords]



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    • 1 Second Ago
  • 70 Comments
      • 6 Years Ago
      IMO the GT500 is a step backwards in terms of suspension. Whereas the Cobra was resonably light, and had a proper IRS, the GT500 is overweight AND stuck with a solid axle.
      • 6 Years Ago
      Yea, pay no mind it weighs two tons, yay horsepowarr! Take that Z06, I failed physics!
      • 6 Years Ago
      No...the Roush and Saleen models have the same rear axle as the regular GT's.

      The Mustang has won or placed high in many road race series. Just do a tiny bit of research and you'll see the light. It's not hard and it probably won't hurt you either.

      And yes, the IRS in the '99 was crap-tastic...wheel hop galore and easy to break.
      • 6 Years Ago
      I think girls prefer Porsches. That ends the debate.

      • 6 Years Ago
      The Mustang is a fat pig compared to the Corvette. Compare it to the Challenger or the Camaro (oh, yeah, I forgot...GM hasn't issued a Camaro yet). Then it holds its own.

      It should hold its value pretty well though. The KR's days are numbered, due to new CAFE standards and the cost of oil.
      • 6 Years Ago
      I'd be more impressed if they can get the car under 2 tons and have a rear suspension design that isnt 80 years old...
      • 6 Years Ago
      Disclaimer: I'm a Mustang Cobra owner.

      That's a lot of juice, no doubt.

      There is still no way I would ever consider this a competitor to the Z06.

      To quote Samuel L. Jackson:
      "Ain't in the same f*n' ballpark, either. It ain't the same league... hell, it ain't even the same f*n' sport!"
      • 6 Years Ago
      "Take that," says the obese, nose heavy Mustang as it gets lapped by the Z06.
        • 6 Years Ago
        Isn't a Mustang a 4 passenger car and a Vette a 2 passenger car?

        I like that you can take a car that's not designed to race and make it eat a race car for breakfast! That to me is cool!

        I love the 89-95 Mustang LX 5.0's that once modified with a Paxton SC and a few tweaks would eat a Vette for breakfast, lunch and dinner! And all for 30K less! :)

        I still respect the Vette though! And for the record, most Vette owners I've ever met are REALLY a-holes! That's not an urban legend! LOL jk
        • 6 Years Ago
        Yup. The Mustang is heavier than a Corvette, with more weight on its nose, a higher center of gravity, and a solid rear axle. The Mustang can not keep up on a road course.
        • 6 Years Ago
        Z06 has it beat.
      • 6 Years Ago
      Yeah.............A mustang magazine coming up with really impressive numbers.............hmmmmmmmmm...........wonder which advertiser pays them the most? Ford?
      • 6 Years Ago
      RJ, you realize the IRS in the older Cobra was complete crap right?

      It was cobbled in straight out of the Thunderbird, added weight and weak parts, and didn't do a thing for the car's performance in any respect. People that build up the older blown Cobras swap in straight axles.

      Just because a car has a rear axle doesn't mean they can't perform brilliantly. Just because a car has IRS doesn't automatically make it any good, just like the old Cobra or the old Opel/Holden design in the LSX GTOs.
        • 6 Years Ago
        I think if I pay nearly $70k for a car it should include modern parts like IRS, just saying.
        • 6 Years Ago
        I test drove a v6 Mustang (No GT's at the dealer at the time) when they first came out, because I loved the way it looks.
        It beat the crap out of me on the test drive and it wasn't even the GT version. I have not wanted one since that day, but I still think they are one of the best looking cars made today.
        I guess I am just spoiled by the ride and handling of European cars with IRS.
        I am hoping that the 2010 Mustang has IRS and rides good. But I think Ford has already said it won't.
      • 6 Years Ago
      Who says Mustangs can't handle?

      http://www.speedsportlife.com/2008/06/24/speedsportlife-imaginary-internet-millionaire-track-test-ferrari-f430-v-lotus-elise-v-dodge-caliber-srt-4-v-ford-mustang-gt500/

      Speed Sport Life took a GT500 to the track with some exotic cars for giggles and it aquitted itself well given the company.

      Also, Mustangs can be easily modified to handle road courses. Saleen, Roush and others do it. You can even do it on your own with Ford Racing's suspension (which is warrantied when dealer installed) and wider tires.

      A good friend of mine competes road races his 06 Mustang GT and he has no problem passing cars that are considered good handlers.

      Now he's even helping building another new Mustang to race around the twisties and win.

      http://www.stinkybeaner.com/uploads/files/5/WMMustang/DSC05720%20%5B800x600%5D.JPG

      http://www.stinkybeaner.com/uploads/files/5/WMMustang/DSC05727%20%5B800x600%5D.JPG

      http://www.stinkybeaner.com/uploads/files/5/WMMustang/DSC05732%20%5B800x600%5D.JPG

      Never be so quick to write off what you go up against at a drag strip or a road course.

        • 6 Years Ago
        "Also, Mustangs can be easily modified to handle road courses. Saleen, Roush and others do it. "

        this is true - so why buy the GT500KR? I'd take the Roush instead if I'm going to spend a ridiculous amount of money on a mustang. I think the point I'm trying to make here is that (in my opinion) aftermarket tuners can produce a better mustang for the money than Ford can. For one thing I believe roush/saleen both have independent suspensions.... can't believe Ford left that out... I'd never buy a sports car with a fixed axle, much less one that expensive...
        • 6 Years Ago
        Tuna,

        If you look at the Roush or Saleen cars that are priced in the $40-45k area, they don't hold a candle to the GT500's extras.

        Most of those cars have a supercharger and some body work, maybe a lowered suspension with springs and shocks.

        The Saleens and Roushes that are real track terrors are more expensive than a GT500 (minus dealer markup which Ford doesn't control). They can also have iffy warranties if the engine combo you get is a stock 4.6L with a blower on it. Of course once you get to the custom built, forged stroker engines, it gets real expensive, to the point of the GT500KR model which is supposed to handle with them too.

        Of course, I also see a number of comments on here about how the GT500 sucks because it weighs 3800 lbs. Funny that this is the same weight as the car that these same people tought as the greatest thing since sliced bread- the GT-R. Funny how many hipocrites there are.
      • 6 Years Ago
      Take the actual numbers from the dyno with a grain of salt. The Mustang rag could very likely have been using a different dyno (Mustang, Superflow, DynoJet, etc) with different settings. It's nice to brag and everything, but you could take the same car under the same conditions, put it on two different dynos, and get two very different results.

      The real value of testing a car on a dyno (one dyno, consistent settings) is tuning - getting a baseline, making incremental changes, and seeing the results.
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