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underdrive pulleys

This is a discussion on underdrive pulleys within the External Engine forums, part of the LSx Technical Help Section category; whats the deal with underdrive pulleys for ls1? ive heard a lot of people say there no good especially for ...

  1. #1
    Pony_eater Pony_Eater's Avatar
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    underdrive pulleys

    whats the deal with underdrive pulleys for ls1? ive heard a lot of people say there no good especially for street...any comments...

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    Knight of Chaos xzaero0's Avatar
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    I have an SLP underdrive pulley for my TA, works great and it revs faster, havent had any problems with it so I don't know why they would say that they are not good for a street car.

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    Senior Member bills98ta's Avatar
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    I ran mine on the street with no problems too !!!

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    Asp underdrive with alternator pully. Runs great no probs on the street!

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    Member chuck4345's Avatar
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    is there a horse power gain ? if so how much?

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    down in it 310stanger's Avatar
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    For whatever its worth, I always felt that the hp you possibly free up with underdrive pulleys just doesnt warrant the money you pay for them.

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    Member Bouvers's Avatar
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    not for an expensive one like ATI I was planning on going ATI for an UD pulley and I came to the same conclusion not worth the 400$ minimum that you pay for one... ASP on the other hand is just as good and half the price... I'm putting one on at the same time as my heads/cam/clutch combo might as well free up some extra ponies since you have to take the stock one off anyway... its good for anywhere between 5-10rwhp and people say you gain throttle response aswell... *a good trait for the street in my opinion*

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    Pony_eater Pony_Eater's Avatar
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    great

    thanks im planning on putting one on when i put a cam in

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    Rice Killa JwMonE99's Avatar
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    Summitracing has them for like 60-70 bucks

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    Member Bouvers's Avatar
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    Quote Originally Posted by JwMonE99 View Post
    Summitracing has them for like 60-70 bucks
    what brand?

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    Rice Killa JwMonE99's Avatar
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    If I remember they were BBK and summitracing brand?
    I havent looked at them in a while or it might of been only LT1 but I cant imagine that the LS1 would of been a lot more.

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    Member Bouvers's Avatar
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    Quote Originally Posted by JwMonE99 View Post
    If I remember they were BBK and summitracing brand?
    I havent looked at them in a while or it might of been only LT1 but I cant imagine that the LS1 would of been a lot more.
    well I'm curious let me know if you find one because I can't find one that cheap

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    Rice Killa JwMonE99's Avatar
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    Heres one for 70 bucks for the LT1
    http://store.summitracing.com/partde...5&autoview=sku

    But after looking for some for the LS1, this is the cheapest I found
    http://store.summitracing.com/partde...5&autoview=sku

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    Member Bouvers's Avatar
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    Quote Originally Posted by JwMonE99 View Post
    Heres one for 70 bucks for the LT1
    http://store.summitracing.com/partde...5&autoview=sku

    But after looking for some for the LS1, this is the cheapest I found
    http://store.summitracing.com/partde...5&autoview=sku
    bah for an extra 40$ you can get an ASP from a different vendor... to each his own but I know where I'm spending my money...

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    Member slpcamaro's Avatar
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    Quote Originally Posted by 5150 View Post
    Asp underdrive with alternator pully. Runs great no probs on the street!
    how did you get the pulley off for the alternator I got the puller but I can't get the bolt off, put the car in forth couldn't get the crank bolt off either going to just wait and get an impact gun to lazy to keep going at it. but when I try with the alternator the pully just spins on the still belt.

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    Quote Originally Posted by slpcamaro View Post
    how did you get the pulley off for the alternator I got the puller but I can't get the bolt off, put the car in forth couldn't get the crank bolt off either going to just wait and get an impact gun to lazy to keep going at it. but when I try with the alternator the pully just spins on the still belt.
    Impact Gun

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    Member slpcamaro's Avatar
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    Quote Originally Posted by ls1camino View Post
    Impact Gun
    lol this is what i figured any suggestions on brands for good prices or where to get everything don't have a compressor or anything yet, also any minimium i need i looked a little saw a lot of them and was looking at hp/psi/gallons what do i really need to get the job done compressor wise.

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    MEMBER 5150's Avatar
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    Quote Originally Posted by slpcamaro View Post
    lol this is what i figured any suggestions on brands for good prices or where to get everything don't have a compressor or anything yet, also any minimium i need i looked a little saw a lot of them and was looking at hp/psi/gallons what do i really need to get the job done compressor wise.
    For home use I would suggest 4-6 hp with a 20-30 gallon tank that would run any impact or air ratchet no problem. An air grinder is a different story. Don't get one of those oil free comps either,to dam loud in my opinion. Air tools make life much easier. Good luck!

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    MEMBER 5150's Avatar
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    Oh ya, anything over 90 psi with a regulator will run your 1/2 drive impact just fine.

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    MEMBER 5150's Avatar
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    Quote Originally Posted by Bouvs View Post
    not for an expensive one like ATI I was planning on going ATI for an UD pulley and I came to the same conclusion not worth the 400$ minimum that you pay for one... ASP on the other hand is just as good and half the price... I'm putting one on at the same time as my heads/cam/clutch combo might as well free up some extra ponies since you have to take the stock one off anyway... its good for anywhere between 5-10rwhp and people say you gain throttle response aswell... *a good trait for the street in my opinion*
    Slowing the accessories down will also theoretically make them last longer.

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