How about those " stock " #'s !!!
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.http://www.youtube.com/watch?feature...&v=ml0lG4sMTJU
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Sounds pretty good too! Nice

 

Here's another one. 614 rwhp!

 

its a tad bit more than my Cobra....I QUESS that would be ok...

 

Guess I could live with that.

 

601 rwhp / 584 rwtq

These cars are definitely underrated.

 

I think there are a lot of dynos that need calibrating.

 

Why's that? If these numbers were obtained all from the same dyno, I'd be inclined to agree with you; the results have come from at least two separate dynos (possibly three) and three different cars. For reference, Livernois ran an automatic 2012 Camaro ZL1 on their dyno and its numbers were 476 rwhp / 476 rwtq.

 

Ignoring the peaks (wonder if the wideband feedback is what causes the waviness of the curves), it looks like about 595 to the wheels, which is around 685 at the flywheel. No wonder they had to re-rate it at 662 HP - they were over the acceptable "tolerance" of the SAE rating.

 

Livernois for one has a reputation for overly optimistic dyno numbers a bit of a joke here in Michigan. The same dyno can vary from day to day let alone different dynos in different places. Who knows when the last time they were calibrated or even if the operators used the proper correction factors. I remember when the 5.0 came out they were tested in the wrong gear. The only number that is trust worthy is Fords crank number.

 

The red car in the OP's video was dyno'd on a portable unit supplied by Ford at the GT500 media event in Atlanta. The black GT500 in the second video, on yet another dyno. I understand that dyno's can vary and ambient conditions play a pivotal role in an engine's output, but we have three videos on three different dyno's in three separate locations in, presumably, different atmospheric conditions, all showing the 2013 GT500 making over 600 horsepower to the wheels.

In regards to Ford's "trustworthy" crank numbers, just run that line by the folks who purchased 1999 SVT Cobras and see what kind of response you get...

 

Lund just tuned the Evolution car and the car put down 633hp/655tq.

 

Only about 200 more rwhp than my pullied 03 cobra....

 

Saw another video dyno test where the 2013 made 550+rwhp they stated with 12% drive line loss that's inline with the factory rating. They took it to Arizona and did 196mph at 200 feet elevation and very warm temperatures. They were sure it would do 200 if the straight were longer and the elevation lower.

 

I think you meant 2,000 feet elevation.

 

Maybe old news and I didnt see it posted anywhere else. NO simulations here.

 

This is the video. They got 583HP

 

Yes that's the one. I couldn't remember exactly so I put 550+. And yes 2000 feet up. No matter what dyno reading is correct the car is amazing and that video really brings it home. Drive every day, do skid pad drives with little chassis oversteer, and do 200mph for less than $100k amazing.