>Hey Mike K, does the pulley's gains come primarily from weight loss or from
>underdriving. UR's website stated that 80% of the performance gain is from
>weight reduction and not due to underdriving. They have three versions of
>the crank pulley. The original version which is the solid pulleys is around
>3lbs. The second version has holes punched in them and is a little over
>2lbs
>and the 3rd generation weighs 1lb less than the second which is a little
>over one pound. Did you test the new ones? It might make twice the hp as
>the
>old UR pulleys.
> > The rest of the pullies only make about 1 hp difference on an SE-R but
>are
> > feelable due to the reduction in rotating weight.
Weight loss does not gain power from a thermodynamics standpoint but it
frees up power the engine already makes. Much of the gain comes from the
underdrive, but what you feel in the seat of your pants is from the weight
reduction.
I tested the first and second generation pulley and found they make nearly
the same power, both work well.
Mike
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