Re: Info on Underdrive pulleys

["Stack" <stack@cchono.com>]

Are you sure it replaces the accessory pullies?  I would think that a 
smaller crank pulley would cause all the accessory pulleys to slow
down vs the opposite.  Also, I think someone mentioned previously
that installation would be quite difficult because of space involved
(none) - may have to tilt the motor.  I may be wrong.

Stanton '95glx

-----Original Message-----
From: Billy T. <btylaska@onramp.net>
To: jettaglx@igtc.com <jettaglx@igtc.com>
Date: Wednesday, October 21, 1998 3:44 AM
Subject: Re: Info on Underdrive pulleys


>Underdrive pulleys replace the pulleys that drive your accessories, like
>the a/c, alternator, power steering, etc.  All of these things are spun
>by the serpentine belt, driven by the crank.  By putting the underdrive
>pulleys on the accessories, you lessen the drag on the crank in two
>ways.  First, the pulleys themselves are aluminum and lighter than
>stock, therefore ruducing the mass that needs to be spun.  Also, the
>pulleys are smaller in diameter, and don't spin the accessories as
>fast.  Your A/C will still get cold, and your powersteering will still
>function as normal, but the crank will not be slowed as much by these
>items.  Think of an engine with no a/c or powersteering...  this is a
>more livable solution.  V8 guys have had these things for years.  As far
>as hp gains, the VR6 may gain as much as 12 hp.  This was an estimate
>from a VW tech that is a friend of mine.  For 179 dollars, it would be
>the cheapest most effective power upgrade for a VR6 available.  As far
>as the 40 hp increase, I believe in some big V8s and high boost engines,
>it is very possible.
>
>Billy T.
>