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I've watched just about every dino pull video there is on YouTube, and the one I'm referring to is the US auto magazine investigation into the true power output of a standard GT-R. They used a dyno with the "run-down" function, to be able to calculate true fly wheel horses. It came out to a tranny loss of about 15%. Have a look on YouTube, and no I'm not finding it for you coz I'm at work and YouTube is blocked. :p
 

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dont be fooled into thinking that run down is 100% effective, it isnt. it doesnt matter how many you tube videos you have watched.

kev
Aye, for sure. It's a lot more accurate than guessing. :)
From memory, they initially clocked 506bhp at the flywheel, guessing tranny losses. At a later date, they used a different dyno which measured 15% tranny loss, which gave 485bhp at the flywheel. A lot closer to what Nissan officially quote. All other variables of the day taken into account, this seems about as accurate as one could expect. I use a road dyno, which has been shown to be within 5% of a "tested against" rolling road. The accuracy isn't as important as being able to see if mods have improved or buggered things! LOL
It needs to be repeatable, thats all.:thumbsup:
 
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