I tested the early models and the latest and found that there is maybe 1/2-1
hp difference between them, right on the abilty of the dynojet to measure
anything. I can only say for sure is that the latest ones did not hurt
anything.
Mike
>I just found out there are 3 or maybe even more generation of UR crank
>pulleys. At least for the SR20. The first generation doesn't have holes in
>it. The older 2nd generations have holes in them but weighs over 2lbs while
>the newer 2nd gen has holes in it also but weighs 1lb 3.3oz. On the UR
>website, it says that only 15% of the hp gains are due to underdriving
>while
>85% are due to weight loss. Is this true? So if two pulleys were the same
>size but one weights 1lb less than the other, then the lighter one will
>give
>an extra 2.7hp?
>That's what I got from UR's website and also, did you test your 6hp gain on
>the SE-R with the 1st, older 2nd, or newer 2nd gen? If it was the 1st gen
>ones u tested, it might be possible that the newest one mite free up to
>10hp.
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