Tuesday, February 16, 2010 - 02:11 pm, by: Camron Garcia(Killacam)
I'm from the East and I keep seeing posts where people say Australian/NZ dynos read differently from ones in America. Whats the difference and how do you convert?
Miles Baker Goo Roo Vic 66 Mustang GT Convertible, 55 Chevy Bel Air, 69 Firebird 455, 69 Nova SS Clone, 65 Mustang Fastback, 67 Mustang Convertible, 67 Camaro RS/SS
Tuesday, February 16, 2010 - 02:40 pm, by: Miles Baker(Milesb)
Some people say it's true, others don't. Some people say those claiming it are trying to make excuses. Many people agree that if you really want to judge power output, check your terminal speed at the track. I don't know, I don't really care any more. The American dynos are apparently mostly inertia dynos and the popular Dyno Dynamics here are eddy current. It seemed to me that the eddy current dyno, being able to hold the roller at a constant speed, should actually read higher....
Personally I believe more in inertia dynos as they measure the power output of the car as it accelerates. The load cell dynos do all sorts of other stuff that I don't find as comfortable. They are probably better tuning tools, but I feel you should measure horsepower as the engine accelerates, because that is how it works on the road/track.
Wednesday, February 17, 2010 - 01:58 pm, by: Aaron Mead(Aaron)
That question is too much like how long is a piece of string? What gear is the car dyno'd in? Whats the air temp? Whats the humidity? Whats the ramp rate in the dyno? Is it strapped down properly or is it riding the front roller only Etc...etc..
You get substantially different readings if you use the same brand of dyno here on the same day but with different software, as well you get big differences between brands, and between hub/rollers/inertia/single and dual retarder/eddy.
SAE adjusted dyno's should read similar, but with the number of inputs that cause the software to make adjustments, how can you ever tell?
Dyno=tuning tool. The only HP/TQ numbers worth looking at are the differences, as percentages before and after modification.
Wednesday, February 17, 2010 - 09:55 pm, by: Steven Anderson(Cusscuss)
not so much about location and more about brands that are used.
Dynojet is generally accepted as ~10% below engine hp. Dyno Dynamics is generally accepted as ~30% below engine power. 'Mustang' Dyno (another US brand) are also supposed to be around 30%.
As said, mph is where its at, its a tuning tool primarily.
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