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slp under drive pulley

This is a discussion on slp under drive pulley within the External Engine forums, part of the LSx Technical Help Section category; is there actual gains to be had with this? worth the $200 or is it just another TB spacer.......

  1. #1
    Senior Member big hammer's Avatar
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    slp under drive pulley

    is there actual gains to be had with this? worth the $200 or is it just another TB spacer....

  2. #2
    MANWHORE TEAM suede's Avatar
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    well it may free up 5-10 horse, but it will help your engine climb the RPM's faster is the biggest improvement....

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    Senior Member clg82's Avatar
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    Quote Originally Posted by big hammer View Post
    is there actual gains to be had with this? worth the $200 or is it just another TB spacer....
    Quote Originally Posted by suede View Post
    well it may free up 5-10 horse, but it will help your engine climb the RPM's faster is the biggest improvement....
    How hard are they to install? and what exactly do they do?
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

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    MANWHORE TEAM suede's Avatar
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    Quote Originally Posted by clg82 View Post
    How hard are they to install? and what exactly do they do?
    they are relatively easy to install, you will just need a new GM crank bolt...

    but what it does is puts a smaller pulley on the end of the crankshaft so the belt that runs all your accessories will turn slower, and with a smaller pully it will have more mechanical advantage, so it will slow it down some and turn the accessories like the Power steering pump, AC, Alt, waterpump easier...

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    Senior Member clg82's Avatar
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    Quote Originally Posted by suede View Post
    they are relatively easy to install, you will just need a new GM crank bolt...

    but what it does is puts a smaller pulley on the end of the crankshaft so the belt that runs all your accessories will turn slower, and with a smaller pully it will have more mechanical advantage, so it will slow it down some and turn the accessories like the Power steering pump, AC, Alt, waterpump easier...
    With my mod's will I notice a difference? and also how hard are they to install on a scale of 1-10? does anyone know where there is a write up on how to install one of these? and do you also have to buy new belts.....sheesh that's a lot of questions but every bit will help!!!

  6. #6
    MANWHORE TEAM suede's Avatar
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    Quote Originally Posted by clg82 View Post
    With my mod's will I notice a difference? and also how hard are they to install on a scale of 1-10? does anyone know where there is a write up on how to install one of these? and do you also have to buy new belts.....sheesh that's a lot of questions but every bit will help!!!
    A. Depends on how easily you notice things.....
    B. 4
    C. Somone correct me if im wrong, (I have not done it but follow me), set the motor at TDC on the stock pully, then remove the bolt holding it on, allign the underdrive as the stock one was and put new bolt in and torqe to spec....
    D. You will use the same sized belt....

  7. #7
    Senior Member clg82's Avatar
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    ummm how do i find out where TDC IS??

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    MANWHORE TEAM suede's Avatar
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    there are numbers on the pulley and a pointer on the block if it is normal... somone who has done this will step in, im just using basic knowledge and guestimating

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    Quote Originally Posted by suede View Post
    A. Depends on how easily you notice things.....
    B. 4
    C. Somone correct me if im wrong, (I have not done it but follow me), set the motor at TDC on the stock pully, then remove the bolt holding it on, allign the underdrive as the stock one was and put new bolt in and torqe to spec....
    D. You will use the same sized belt....
    You need new belts.

    #K060763 (Main Belt)
    #K040378 (AC Belt)

  10. #10
    MANWHORE TEAM suede's Avatar
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    I stand corrected....

    elc you done this?

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    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by suede View Post
    I stand corrected....

    elc you done this?
    I have, not SLP version though. He is correct about new belts along with the new bolt.

  12. #12
    MANWHORE TEAM suede's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    I have, not SLP version though. He is correct about new belts along with the new bolt.
    am i close with the install?

  13. #13
    The Generals Finest Deviant LS1's Avatar
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    Why would you need to TDC anything at all? LS1 cranks are not keyed and are internally balanced. That would mean all crank pulley's would be zero balanced. If it's zero balanced then you can put it on any way you want.

  14. #14
    MANWHORE TEAM suede's Avatar
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    Quote Originally Posted by Deviant LS1 View Post
    Why would you need to TDC anything at all? LS1 cranks are not keyed and are internally balanced. That would mean all crank pulley's would be zero balanced. If it's zero balanced then you can put it on any way you want.
    Im not worried about balance, I was saying for purposes of when you need to find TDC for adjusting valves, cam install stuff like that. but i guess cam is set internally with timing chain, but just like wiht older motors where you had a distributer to adjust timing, you had to watch the numbers on the pulley..... but like i said, ours may not even have numbers all being computer controlled...

  15. #15
    Member midi_2001's Avatar
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    Here's SLP's instructions from their website for 1998-02 LS1 Camaro/Firebirds:
    http://www.slponline.com/inst/100221.pdf

    Here's SLP's instructions from their website for 1997-2006 LS1/LS6/LS2 Corvettes:
    http://www.slponline.com/inst/100225.pdf

    There's some information in the page as well:
    http://www.ls1howto.com/index.php?article=2

    'I' personally have not performed this yet, but may in the near future.

  16. #16
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    Quote Originally Posted by suede View Post
    I stand corrected....

    elc you done this?
    Not yet, I have the pulley and the belt sitting in my garage waiting to be installed next week. I just researched the parts I'm using A LOT.

  17. #17
    Member qwk93ta's Avatar
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    Does anyone have the part number for the new bolt?

  18. #18
    Senior Member clg82's Avatar
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    Quote Originally Posted by qwk93ta View Post
    does anyone have the part number for the new bolt?
    12557840

  19. #19
    The Generals Finest Deviant LS1's Avatar
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    Quote Originally Posted by suede View Post
    Im not worried about balance, I was saying for purposes of when you need to find TDC for adjusting valves, cam install stuff like that. but i guess cam is set internally with timing chain, but just like wiht older motors where you had a distributer to adjust timing, you had to watch the numbers on the pulley..... but like i said, ours may not even have numbers all being computer controlled...
    There are no numbers on the crank pulley, there is no valve lash to adjust on these motors, there is no distributor to dial in timing with.....

  20. #20
    Senior Member clg82's Avatar
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    Quote Originally Posted by Deviant LS1 View Post
    There are no numbers on the crank pulley, there is no valve lash to adjust on these motors, there is no distributor to dial in timing with.....
    ok...........................

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