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