Quote:
Originally Posted by mid_life_crisis
From the NASA time trials rules:
"Dynamometer tests must be conducted on a Dynojet Model for front and rear wheel drive vehicles, and on a Dynojet, Mustang, Dyno Dynamics, or Dynapack for AWD cars, in a commercial facility that offers dynamometer testing as part of their business and is open to the public. All (AWD) Dyno test results using a Mustang or Dyno Dynamics dynamometer will have 10% added to the maximum horsepower reading to obtain the number that will be used to calculate the “Adjusted Weight/Power Ratio”
For what it's worth, NASA doesn't appear to think it's a myth.
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Definately not a myth. But some caution is in order. All dyno numbers can be fudged. About 13 years ago, my first dyno was a Mustang md250. About 80 percent of owners fudged something to try and simulate dynojet numbers. Customers were not as informed. The internet was newish etc. So bigger hp was a selling feature. I never bumped mine. But it was very common.
Some shops do it even today. Even the world famous Westech had their Superflow chassis dyno bumped to simulate dynojet.
Dynojet is probably most difficult to fudge. So for all its flaws, the numbers are more consistent dyno to dyno and location to location.