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Mr. April 2008, Image Master
2005 X
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1,325 Posts
Discussion Starter #1
I just threw in a brand spankin new Perrin crank pulley. This wasn't my first one of these to install, but it definatly was the easiest! I did just like the instructions say and that big 'ol stock pulley came off easily.
When I did it on my RS I noticed an imediate difference. Going out and driving this eveing my butt dyno didn't seem to be giving me the horse power numbers I thought... None the less I'm stoked on having the lighter crank pulley in even if it's just for the "Bling" facor... :lol:

ScoobyMods install thread: http://www.scoobymods.com/forums/showthread.php?t=163

 

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Registered
1998 Forester "S" lifted. Bog-o-matic
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2,006 Posts
I am still waiting for a pulley that has the OE removal tool holes in it (hint hint, Tom are you listening?). Otherwise I would have done one by now.

Let us know if/how much of a difference it makes.
 

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11 sec club
04 Cayenne TT
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1,486 Posts
I didn't notice much of anything either when I put mine on but I wouldn't really expect to notice that small of an increase, either.
 

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22 Posts
Same here.. didn't notice much difference either. But it seemed like I was able to maintain higher speeds at slightly lower RPM.
 

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Premium Member
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2,132 Posts
I don't think this is possible. RPM is directly related to speed via gearing.

hunts said:
Same here.. didn't notice much difference either. But it seemed like I was able to maintain higher speeds at slightly lower RPM.
 

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2004 XT AT
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1,101 Posts
Rotational inertia of the pulley is way down in the noise compared with all the other work the engine has to do. Yes in theory it should make a tiny difference, but immeasurable.
 
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