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SLP underdrive pulleys

This is a discussion on SLP underdrive pulleys within the External Engine forums, part of the LSx Technical Help Section category; Originally Posted by MikeSomething I'm using an ASP U/D Gas mileage...eh, not really payin attention. Power...my car revs alot quicker. ...

  1. #21
    The Bandit Wesman's Avatar
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    Quote Originally Posted by MikeSomething View Post
    I'm using an ASP U/D

    Gas mileage...eh, not really payin attention.
    Power...my car revs alot quicker.

    You'll def notice the needle on your Amp gauge move down at idle tho.
    It's also funny, I thought they gave me a stock pulley cause it was kinda on the heavy side, but when I saw how heavy the monsterous stock one was and how big it was, I was like "DAMN!". The stock pulley could probably be a spare wheel for a horse-drawn buggey or something!!!
    So if you have a big stereo system...UDP = bad idea

  2. #22
    SS#430 1 of 74 7camaro7's Avatar
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    so when you do "pullies," how many do you actually replace?

  3. #23
    Impounded MikeSomething's Avatar
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    I only replaced my crank pulley... The BIG one...
    Some people replace the alt. pulley as well.

  4. #24
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    Quote Originally Posted by Bigsword4 View Post
    I appreciate the help, I plan on putting it in sometime toward the end of the month.
    Are there any other problems related to the underdrive pully?
    Thanks
    Some people say that the belt wines but mine sounds just like stock, and your amps will go way down when you stop but its really no big deal. If you dont have the right tools do not attempt this and take it to some one who dose, simple hand tools will not do the trick for this bolt on.

  5. #25
    Member jag42420's Avatar
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    Couldn't changing the alt pulley too fix the alt problem?
    Last edited by jag42420; 01-12-2007 at 08:46 AM.

  6. #26
    Member jag42420's Avatar
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    Overdrive Alternator Pulley - Recommended for automatic cars to help bring alternator speeds back to near stock levels without sacrificing too much horsepower. Extremely important for vehicles with high accessory drag such as cars with lots of stereo modifications.

  7. #27
    Rollo Tomassee AKIRA's Avatar
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    Quote Originally Posted by MikeSomething View Post
    I only replaced my crank pulley... The BIG one...
    Some people replace the alt. pulley as well.
    Yeah, but Id say if you have to buy the alt. pulley cuz of bigger stereos and such, then forget it. I doubt its noticeable and its extra money.

    BUT.

    Some people want every extra horse they can find.

  8. #28
    Rollo Tomassee AKIRA's Avatar
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    Quote Originally Posted by sunsetta View Post
    I have the SLP pulley on my car, love it, it's SLP#100221. You will need two new belts Gates# K060763 and #K040378, and a new stock GM crank bolt.
    Hope this helped you guys make a decision.
    Thank you!Thank you!Thank you!Thank you!Thank you!

    You have no idea how hard it apparently is to get these numbers on here!

    The belts are shorter than stock belts, right?

  9. #29
    386HP 373TQ jwindbigler's Avatar
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    Yeah they are

  10. #30
    SS#430 1 of 74 7camaro7's Avatar
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    Quote Originally Posted by MikeSomething View Post
    I only replaced my crank pulley... The BIG one...
    Some people replace the alt. pulley as well.
    should m6 cars switch the alt pulley too?

  11. #31
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    Quote Originally Posted by Bigsword4 View Post
    Are these any good? Is it best to put these on when your is stock or wait until after a few mods?
    at any time this mod is good, it gives 8-10rwhp gain... also helps on gas savings 2mi/gal savings.

  12. #32
    Member speedkills's Avatar
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    Recently installed the SLP damper/pulley. I bought a longer bolt of 130mm where the stock bolt is I think 113mm long. Washered up as I went and fought it on. I couldn't get the stock bolt to move the damper once I had enough threads for it to grab onto inside the crank snout. Even after removing the dried out red RTV stuff on the bottom side of the bolt flange and lubricating the flange I couldn't get the damper to move. Just got a trick from the Texas chapter to heat up the damper and it should slide on. This should work because I have used the same heating principle to get ring gears on flywheel.

    Haven't driven it yet, waiting on a tool from summit to keep the crank from turning then will bring the new bolt on around to the required 140 degrees. But I have put the belts on and cranked the engine, no oil leaks and the belts stay on when I rev it up.

  13. #33
    Junior Member Team Ramrod Customs's Avatar
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    SLP sells the pully for $249.95 and it includes the new bolt, but you still need the new belts, (Gates #K060763 and #K040378 or equivalent. If anyone knows of a pully that it just as good and where to get it cheaper, please let us know. Thanks.

  14. #34
    SS#430 1 of 74 7camaro7's Avatar
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    ebay its $213 shipped.

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