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Underdrive pully

This is a discussion on Underdrive pully within the External Engine forums, part of the LSx Technical Help Section category; i bought one from asp a few days ago, and it should be here friday. That with a lighter flywheel ...

  1. #21
    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    99 Z28 with an SS complex

    i bought one from asp a few days ago, and it should be here friday.

    That with a lighter flywheel should make the engine scream with the quickness.

  2. #22
    Senior Member ninobrn99's Avatar
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    you hay have issues with idle. i know a few people that have with aluminum fly's.

  3. #23
    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    Damn, hopefully i don't have any problems. I've got the billet steel flywheel. They just came in yesterday. I wont have time to put them in until two weeks later. I'm getting underway for a couple weeks here.

    GO NAVY!

  4. #24
    Rollo Tomassee AKIRA's Avatar
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    I am glad to see ASP is no longer the only company making pullies for our cars (I have an asp).

    A pulley swap has been the smallest seat of the pants feeling Ive ever noticed from bolt ons. Its noticeable and thats a good thing. Cat-backs, CAIs, I never feel shit with those.
    99 T/A M6
    LS6 intake, Hooker Coated Long Tubes, Y-pipe w/1 carsound cat, Hooker Catback, MTi Clear Lid, FRA w/ Holley Power Shot, ASP crank pulley, 1.8 RRs, 3.73s w/TA girdle & Eaton Differential, Granatelli SFCs, Pro 5.0 Shifter, LS6 Clutch, Diablo, TByrnes Maf Ends (in winter), All the Free Mods

  5. #25
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    I have a SLP one. I like it. No problems. Higher side walls to prevent belt slip off.

  6. #26
    Got Juice? Nasty TA's Avatar
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    Quote Originally Posted by tigersport14 View Post
    how much does one of those run you to buy and have someone install?
    They cost around 175.00 to 230.00 depending company and vebdor. I paid 195.00 for mine from slp. It took about 30 minutes but i've done over 25 of them from all companies. Probly take yo uan hour. Make sure you have an impact and use a new crank bolt. Make sure you torque it to 260 foot pounds. You also need a puller and use the old bolt to reinstall. Good luck and hope this helped.

  7. #27
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    After installing the underdrive Pulley, were you able to retain teh original Belt or was a different size required?

    I'm thing about a pulley.

  8. #28
    Member 98Z-28Camaro's Avatar
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    You have to have a different belt. I think the parts store said mine was actually for a ford taurus (however you spell it). But my pulley caused my belt to be over an inch shorter.

    I have had no idle problems.

  9. #29
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    Quote Originally Posted by Red Baron View Post
    After installing the underdrive Pulley, were you able to retain teh original Belt or was a different size required?

    I'm thing about a pulley.
    When I got my pulley from SLP they gave me the Gates belt part numbers to get. Both belts have to be changed.

  10. #30
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    No problems with my SLP.

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