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Underdrive Crank Pulley Does What?

This is a discussion on Underdrive Crank Pulley Does What? within the External Engine forums, part of the LSx Technical Help Section category; If Your Not Running A Supercharger, What Does This Accomplish?...

  1. #1
    Junior Member Ponti-MANIac's Avatar
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    2000 Pontiac Trans-am WS6

    Underdrive Crank Pulley Does What?

    If Your Not Running A Supercharger, What Does This Accomplish?

  2. #2
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    Quote Originally Posted by Ponti-MANIac
    If Your Not Running A Supercharger, What Does This Accomplish?
    Slows down all accesory drives, altenator, water pump, etc. Thereby saving horsepower.

    I tried several, but I ended up with a 10% under drive Fluid Damper. Any thing less and I was having temp problems in the summer time with the ac going. I have an SLP HD radiator, but the water pump just was not turning fast enough in traffic with the smaller pulleys. The 10% Under drive works good for me!

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    Junior Member Ponti-MANIac's Avatar
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    Where can I get my hands on the 10% underdrive fluid damper?

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    Quote Originally Posted by Ponti-MANIac
    Where can I get my hands on the 10% underdrive fluid damper?
    Part Number: FLU-720102 at Summit Racing Equipment! It is not cheep, but it is a top notch balancer.

    http://store.summitracing.com/defaul...h.asp&N=400296
    Last edited by Deeavi; 02-17-2006 at 09:52 AM.
    2013 Camaro SS Convertible, Whipple Supercharger, Kooks Coated 1 7/8" headers, CAI Cold air induction
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    Senior Member SeVeReDiStOrTiOn's Avatar
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    Eh....save your money and put it towards some good headers...you'll be disappointed with the gains from a UP. But if you have money to burn then go for it.

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