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Underdrive pulley questions

This is a discussion on Underdrive pulley questions within the External Engine forums, part of the LSx Technical Help Section category; Underdrive pulley ads claim improved mileage and 10+rwhp. Opinions? (Other than the obvious needing of a new belt)...

  1. #1
    Member jag42420's Avatar
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    2002 WS6 Trans Am

    Underdrive pulley questions

    Underdrive pulley ads claim improved mileage and 10+rwhp. Opinions? (Other than the obvious needing of a new belt)

  2. #2
    Member jag42420's Avatar
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    I noticed SLP has one that has raised edges to prevent belts from slipping off. Anyone had problems with here that?

  3. #3
    Life in the Fast lane sunsetorangess's Avatar
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    In my opinion its not worth the hassle. It will give gains but nothing you will feel.
    J
    2001 SS, Its not the car its the Driver that matters....

  4. #4
    Member 89LX's Avatar
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    2000 Z28 M6

    Good Mod

    I think it is a very good mod with other bolt-ons. Remember you can't generally feel (seat of the pants) small gains. They are accumulative by nature and will result with more power at the end process. UD's don't make power they free up parasite drag resulting in faster windup and RWHP. Known fact with many sources of dyno charts (all auto's) to prove it. Most seem to add between 8-12. SLP sells their UD for $213 on EBay (what I have) and no belt issues yet.


    2000 Z28 M6, SLP Lid, Smooth Bellows, SLP UD Pulley,
    P&P TB and Maf, TB By-Pass, Front Strut Brace, Hooker CB, Predator Tune
    Last edited by 89LX; 10-19-2006 at 06:56 PM. Reason: no signature

  5. #5
    Member Sunset T/A's Avatar
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    No belt jumping issues with SLP pulley with stock tensioner or with the Katech tensioner.

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