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Thread: Light weight UnderDrive Pulley.

  1. #1
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    Default Light weight UnderDrive Pulley.

    I've been told to get an underdrive pulley by some of my homeboys, but on the other hand some say no.... what do u guys think? should I get one or no?

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    ewww...stinky thepolecat's Avatar
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    and get a huge wing!
    95 Buick Roadmaster Estate Wagon Limited

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    what else is done to the car?
    95 Buick Roadmaster Estate Wagon Limited

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    header,exhaust,cai,I manifold, throttle body. light flywheel.!
    Last edited by Black4DrEK; 08-05-2007 at 04:52 PM.

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    ewww...stinky thepolecat's Avatar
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    if you are running an audio system you will drain your battery. if you aremgoing all motor then it can help a little
    95 Buick Roadmaster Estate Wagon Limited

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    Drain the battery? HOw?

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    it UNDERDRIVES your other components like the alternator- thus draining your battery if you are running a large audio setup. If you don't have subs or any big draw of power then you are ok.


    Id read up a bit more them make your decision
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    well i got a system soo i guess fuck it for now.

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    Assuming a system will drain a battery, if the car is running a Underdrive pulley might be jumping the gun. What kind of amperage is the system running? It is quite possible to safely run a system on an Underdriven alternator, there are too many unknown factors to accurately answer the question.

    In terms of performance, the gains are minimal anyway. I agree with JDMjames, read up some more and decide if its really worth the money to begin with.
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    could always get the underdrive pulleys and just wire up a spare battery in the trunk for your system...

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    You could also run it with Optima battery. I've done it before, worked just fine. I had UR crank pulley, power steering pulley and alternator pulley.
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    Extra battery's mean extra weight. Adding that much weight takes from whatever performance the pulley added. I understand the motor has less mass to move, and the benefits in throttle response, quickness of revs, but ultimately i think the original posters intentions are to have a faster car...

    Ultimately read up, maybe even find another modification inthe same price range and run with that. Save up and gets a cam(s) IMO...

    Do you have a stock motor?
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    Quote Originally Posted by deady
    Extra battery's mean extra weight. Adding that much weight takes from whatever performance the pulley added. I understand the motor has less mass to move, and the benefits in throttle response, quickness of revs, but ultimately i think the original posters intentions are to have a faster car...

    Ultimately read up, maybe even find another modification inthe same price range and run with that. Save up and gets a cam(s) IMO...

    Do you have a stock motor?
    Quote Originally Posted by Black4DrEK
    header,exhaust,cai,I manifold, throttle body. light flywheel.!

    If he was worried about weight, he wouldn't have put a system in.
    99 Infinti G20t w/ Primera Parts and a few other small things

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    i thought about that while posting, and knew it would be brought up. Without further information this thread should be over.

    None the less, an extra battery ( depending on the system ) could weigh every bit as much as the system itself. Regardless, we're comparing the car how it sits now, to how it would after the pulley install...
    Single... but looking.

  15. #15
    www.jasontbarker.com speedminded's Avatar
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    Quote Originally Posted by xbn83
    You could also run it with Optima battery. I've done it before, worked just fine. I had UR crank pulley, power steering pulley and alternator pulley.
    the alternator pulley is smaller to compensate for any loss of the other pulley

  16. #16
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    if youve got a b16 ive got a lightweight pulley ill trade even for a stocker

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    If you wanna gain an extra 5hp go for it. But you should lose the system if you are worried about speed.

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    I love the internet. Tons of BS information. Here is the bottom line. Now - if you have a HUGE, and I mean HUGE audio system then it's possible that it will cause a strain on the alternator WHEN the system is really pounding. HOWEVER, modern alternators have this thing called a voltage regulator built in that compensates for this. How do I know? B/c I ran Air Ride on a stock CB7 w/ not 1, but TWO 3/4 horse VIAIR compressors and when they kicked on, literally in less than a second the regualtor did what it was supposed to do and bumped up the amps. With that said, I will tell you this.... MAKE THE CHOICE between speed or audio. I am a musician, so I always have a system that imaged and staged correctly, but you can get that w/ replacing the door speakers and having an amped deck. Awesome sound, w/ none of the weight of heavy ass subs.

    Now - those are the FACTS - here is some OPINION. Lightened pullies > underdrive pullies. Weigh your underdrive pully against the weight of your stock pulley - u might be in for a surprise.

    If you have your heart set on audio, then call this guy - he is the END ALL to alternator issues and can beef up your stock unit. Good luck:

    www.mralternator.com


    /thread
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