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Thread: Underdrive Pulleys

  1. #1
    Join Date
    Nov 2005
    Location
    San Jose CA.
    Posts
    177
    So like the title asks?
    Anyone have any issues?
    Anyone feel the benifits?
    What are the best quality pulley sets available and where?
    626/762 2005 SIERRA 11.34@119.81
    My other ride is a '91 Electraglide custom.

  2. #2
    Join Date
    Sep 2005
    Posts
    314
    I have a set of ASP's on my truck. I dont have anything good or bad to say nor have any issues. If I could take it back I would spend the 249.99 on somthing else JMO...

  3. #3
    Join Date
    Nov 2005
    Location
    San Jose CA.
    Posts
    177
    Like what?
    Things i want to do still are...
    Convertor-not sure which speed for my 4x4.
    Cam.
    I was thinking pulleys would help make 10 hp?
    626/762 2005 SIERRA 11.34@119.81
    My other ride is a '91 Electraglide custom.

  4. #4
    Join Date
    Feb 2006
    Location
    Huntsville, AL
    Posts
    9
    You'd get alot more out of electric fans than underdrive pulleys.

    Underdrive pulleys are (from what I understand) just smaller diamiter pulleys so it leeches less power from the engine. Cons are you engine will run hotter and the alternator will work harder due to the smaller pulley wheels.
    1992 Silverado 1500 - 4.3L/NV4500
    MSD 6AL ignition box, MSD 8.5MM wires + cap&rotor, K&N filter, VintageAir electric fans

  5. #5
    Join Date
    Nov 2005
    Location
    San Jose CA.
    Posts
    177
    Already have E-Fans! LOL, lookin to squeeze a few more ponies out of this before i have to spend the big $$ and do a cam.
    626/762 2005 SIERRA 11.34@119.81
    My other ride is a '91 Electraglide custom.

  6. #6
    Join Date
    Jun 2005
    Location
    Round Rock
    Posts
    1,517
    <div class='quotetop'>QUOTE(trever1t &#064; Feb 12 2006, 05&#58;42 PM) [snapback]44299[/snapback]</div>
    Already have E-Fans&#33; LOL, lookin to squeeze a few more ponies out of this before i have to spend the big &#036;&#036; and do a cam.
    [/b]
    Come on do it..... You know you want to do a cam..... Why avoid what you know you want in your heart&#33;&#33;&#33;&#33;

    I&#39;ll tell you in about 2 weeks what fun you are missing out on Allen is getting me set up with a custom cut cam, now deciding whether he or I install it......
    08 HHR SS
    Black on Black 5 spd with no options


    Pics of Christine, the '05 VHO My Car Domain Site

  7. #7
    Join Date
    Jan 2005
    Location
    Humble/Houston TX
    Posts
    2,586
    alot of ud pulley threads here lately. i havent done it myself but the general consensus is that money is better spend elsewhere

    old mod list: H/C/I/N/E/G 408
    new mod list: 5.3, gears/posi, mufler and tune : (

  8. #8
    Join Date
    Apr 2005
    Posts
    454
    save the money untill you have &#036;600.00 and get a cam package from thunder racing.. thats what im doin when i get my tax returns in a few days... oh and gettin new tires
    1999 GMC Sierra black reg cab short bed SLE Z71 5.3 <--CARDOMAIN PICS
    NELSON 93 hot tune, 02 PCM, VOLANT Ram air intake, MSD wires, ACdelco iridium plugs , Edelbrock ceramic shorty headers, jegs off-road y pipe, Dynamax int pipe, 3" Magnaflow Exhaust with turndown, EGR removal, throttle body bypass, vette servo, long servo pin, performance 4th apply piston, B&M shift kit, SLP 160* thermostat, LS1 Fans, NELSON harness, ported and polished throttle body (did it myself, for free lol)..... _______? cam is next as soon as i stop spending all my money

  9. #9
    Join Date
    Feb 2005
    Location
    Austin, Texas
    Posts
    2,053
    Jethro if you need help doing it let me know I guess you could say I know how to do one. Its easy as long as you have the tools and an air ratchet.

    I have an UD pulley on my 418 and it made my truck run a little hotter but other than that its fine. I would spend the money on the cam first. My ASP UD pulley was well worth the 80 bucks I spent on it
    2007 CCSB Z71 VortecMax: Stock!

  10. #10
    Join Date
    Jan 2005
    Location
    Humble/Houston TX
    Posts
    2,586
    <div class='quotetop'>QUOTE(1slow01z71 &#064; Feb 13 2006, 04&#58;20 PM) [snapback]44380[/snapback]</div>
    Jethro if you need help doing it let me know I guess you could say I know how to do one. Its easy as long as you have the tools and an air ratchet.

    I have an UD pulley on my 418 and it made my truck run a little hotter but other than that its fine. I would spend the money on the cam first. My ASP UD pulley was well worth the 80 bucks I spent on it
    [/b]
    thought you said the ls1 pulley wouldnt work on your engine??

    old mod list: H/C/I/N/E/G 408
    new mod list: 5.3, gears/posi, mufler and tune : (

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