From a previous thread, the comment was made about US dynos always reading higher than Aus dynos. Just wanted to get some opinions on this as Ive heard this said a few times and am wondering how accurate it is. With corrections for altitude, atmospheric pressure and temps, where would the difference come from? Ive even checked for instance with dyno dynamics, and they appear to be used also throughout the US, so we are even using the same dynos and software. Any opinions?
I remember reading the US use a different type and brand of dyno. And the weather conditions are different. Unless its run back to back on the same dyno, there is going to be a difference. I remember that the r32 they took to japan had quite a significant hp boost just from the weather.
Iv always thought there was some sort of control, regulation on dynos world wide. Hence if Nissan Japan announces 300rwkw then when the US get it and run it on the dyno it would be very close to 300rwkw. I think compared to the US, we are way behind the power figures. I mean we havnt seen one car hit over 500kw here, where in the US they have. Maybe thats why some people in AUS assume the US dynos must read higher because otherwise why arnt we seeing the same sort of figures here in OZ. First reason i think is that they have a lot more zeds their so the number of big powered zeds will also increase comapred to us. Secondly its cheaper to modify a Z in the US then it is here. Thirdly, maybe we dont have the talent Z tuners the US have. Or because of the expense our tuners arnt bold enough to push the Z to its limits. Alot of this can also be seen in the quarter mile times. We have our magical Wizard who is the only one in the 11'sec bracket. And that has come easily, with a fully built engine and aftermarket turbos. But in the US you see 11 sec Zeds running stock turbos. Does that mean they have a shorter quarter mile too? lol :zlove:
the software and types of dyno's are all the same, and we do have big hp zeds here over 500kw, not all of them on the forum though!, the us has alot less restrictions on modifications also, not to mention a much greater population + more suppliers + more competition, and parts and labour are a bit cheaper there also, all contributing factors, they do have alot more higher powered modified cars in general.. full stop
The variation has to do with the correction standard used to rate horsepower. In the past I was told that US horses were bigger than Aus horses because they used a different correction factor. Here is a link that explains a little more about the US correction system. SAE standrds, DIN standards and JIS standards all effect the final outcome. http://www.land-and-sea.com/dyno-tech-talk/corrected-horsepower.htm
all US dynos over read because the workshops there realise if the cars don't perform well on a dyno, the customer will go somewhere else. being the power hungry country that invented drag racing and all... so its now common practice there to make the dyno over read by 50-100 horses the snowball effect has now become so big that just about every dyno in the country is set to over read. of course i got nothing to back this up. just spewing shit and taking the piss but i suspect a lot of people do feel this way about some of the cars over there because apparently there are stock engined TTs with stock turbos making 500rwhp so it's no surprise there's a lot of people calling BS. namely magicmike who made the comment in the other thread that sparked this one.
There is a lot in what you say. Talk with a dyno operator who is prepared to give you the real facts, figures can and are manipulated all the time.
actually theres a longer. Our 1/4m is a measured 400m isn't it? where as theres is a measured 1/4m - 402m
2 metres? 2 METREs difference? Travelling at 150km's+++ an hour towards the end of that is a tiny tiny fraction of a fraction of a seconds difference
A lot of the Dynoruns in the U.S are done with high octane "race" fuel, mapped for that fuel and running higher boost than you would normally run on Pump fuel. But even on those running on Pump fuel they definatly have higher figures that what the rest of the world see's.
