Quote:
Originally Posted by 370Zsteve
Two dynos reading a difference of 385 -> 455 is insane. I don't care what brand of dyno, that' s just flat out insane. My NA engine had a difference of about 3-4% between a Mustang and DynoJet result.
Something else was going on when one of those readings was taken. Quite possibly a mis-calibrated dyno at one of the locations, or complete incompetence on the part of one or both of the dyno owners.
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here is you some reading that may interest you.
to give you an idea on the number differences, the following is taken straight from the C&L Performance website
"We have received a report from a "concerned customer" who informed us that some people believe that the dyno chart at the bottom of this page has incorrect information. Apparently, people on internet web forums somehow believe that we "do not know what we are talking about" due to the fact that we state that a stock 2003-2004 Cobra made "only" 316 rear wheel horsepower on a MUSTANG dyno. Since "everyone knows that these cars make at least 360 rear wheel horsepower stock" and these people must be ignoring the first three charts on the page, we felt it necessary to explain. The first three charts on this page were tested using DYNOJET dynos, which is an inertia style dyno. The SAE corrected numbers that it delivers are what most people use when trying to compare horsepower numbers "on the internet", because it is the most commonly used type of dyno. The chart at the bottom of the page was generated from testing on a
MUSTANG dynamometer, which is a load bearing dyno, and these dynos will typically read about 14% lower than the Dynojet numbers that most people are used to seeing.
If you take the baseline value that is mentioned (316) and multiply it by 1.14, you will 'amazingly' come up with a value of 360.24 HP as the "stock" adjusted value. In addition to this, if you take the peak "after" horsepower reading of 372.9 (which was measured with an exhaust upgrade and our air intake assembly) and multiply it by 1.14, you will achieve a value of 425.1 HP. If you look at the second dyno chart on this page, you will find that another vehicle with the similar modifications (exhaust upgrade and our air intake) just so happened to make 426.44 HP on a Dynojet, which is only 1.3 HP off from this adjusted value. Even though the base values are lower when using a Mustang brand dyno, you will notice that the improvement of 22 rear wheel horsepower that was measured when testing our intake assembly was not substantially different than the gains shown in the first two dyno tests on this page. I
f this doesn't make sense to you, then we strongly suggest that you do not "contribute" to the education of people in your community on the internet message boards. The caption under the last dyno chart explicitly states that this vehicle was tested on a Mustang dyno. We hope that this information will clear any confusion that might have existed in the mind of any internet "experts" who were unaware that different types of dynos exist and that they can actually deliver different horsepower readings."
now if you have read all of that steve then you know you have just been
muhauahahahahahhah.