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Underdrive pulleys?

Discussion in 'Engine Building' started by ryangt, Jan 6, 2005.

  1. ryangt

    ryangt Senior Member

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    do underdrive pulleys stand to make me any power off my stock d15 hf rex?
    pro's con's anything helps
    are they worth the price?
     
  2. B16RacerN2NR

    B16RacerN2NR Working Hard VIP

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    don't waste your time, especially on a daily driver, and a hf motor at that.
     
  3. pissedoffsol

    pissedoffsol RETIRED

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    they are not harmonically balanced.

    unless you plan to re-balance your entire roating assembly, it could lead to oil pump breakage and a shitty feeling motor (vibrations like an off-blanced wheel)
     
  4. spydy43

    spydy43 Senior Member

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    pro's you might get 3 WHP if your lucky
    Con's in my case was a spun bearing on my daily driver leading to a pricey rebuild or buying a new motor. Definetly not worth the small hp gain.
     
  5. dohcvtec_accord

    dohcvtec_accord WRX Sellout

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    They won't help you until you're making huge amounts of power.

    On my turbo 2-liter, a lightened (not underdrive) crank pulley got me some pretty large gains after it was tuned for. On a stock or near-stock engine, you won't see much at all.
     
  6. integraslut78

    integraslut78 Stylus DJ Extraordinaire

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    They are just not worth it stright up. I would be surprised if you got 1whp.
     
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