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Old 08-08-2006, 03:19 PM   #17
frostyTSM
Scooby Newbie
 
Member#: 54361
Join Date: Feb 2004
Location: San Diego
Vehicle:
2004 WRX Sedan
Java Black Pearl

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Una-FAQ-bomer,

I've read a lot of your FAQs and have found them very helpful in recent months. Thanks.

I got a Perrin Crank pulley installed yesterday at my mechanic's shop (not underdrive). They took a bit longer than normal because they wanted to lock the crank shaft in place (not using the "put in 5th gear and step on break" technique) to get just the right torque when putting on the new one.

Anyway, yes there is a harmonic dampener on the stock pulley. Is it needed? I'm not a mechanic, but all mechanics I have talked to have said no so take from what what you will.

Obervations:
  • the engine rocks back and forth more when idling
  • when boosted, it accelerates smoother (I think the harmonic balancer was causing a spring effect on the crank)
  • revs drop much quicker when shifting, and smooth shifts are harder (much like what I've heard about lighter fly wheels)
  • the car itself doesn't feel like it is shaking any more than before (when idling)

Edit: harmonic balancer -> harmonic dampener (debate this if you want to)
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Last edited by frostyTSM; 08-08-2006 at 09:08 PM.
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