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The Terminator
Engine/Tuning
pulley questions.
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<blockquote data-quote="IronTerp" data-source="post: 2746354" data-attributes="member: 12702"><p>Venix my man, both the upper and lower pulley arrangements do the same thing: spin the blower faster. This in turn increases the boost levels which in turn, usually results in increased performance. If you popped your hood and looked down into your lower pulley arrangement, you will see that the factory pulley is part of an assembly unit and has a idler pulley which is to the right of it. When you upgrade the lower pulley, you need to remove that entire factory assembly and replace it with an aftermarket pulley and kit which relocates that idler so that the new, bigger lower pulley will fit without touching it.</p><p></p><p>This is why lower pulley kits are $300 to $350 dollars.</p><p></p><p>Occassionally, one of us will run a larger diameter lower pulley only to increase boost levels......most of the time, we'll run an upper pulley only (simple, easy, and cheaper), and the new thing is to run a combination of the two.....aka Postban's suggestion above.</p><p></p><p>Tons of information on this site for you to use to make the decision that fits you.</p></blockquote><p></p>
[QUOTE="IronTerp, post: 2746354, member: 12702"] Venix my man, both the upper and lower pulley arrangements do the same thing: spin the blower faster. This in turn increases the boost levels which in turn, usually results in increased performance. If you popped your hood and looked down into your lower pulley arrangement, you will see that the factory pulley is part of an assembly unit and has a idler pulley which is to the right of it. When you upgrade the lower pulley, you need to remove that entire factory assembly and replace it with an aftermarket pulley and kit which relocates that idler so that the new, bigger lower pulley will fit without touching it. This is why lower pulley kits are $300 to $350 dollars. Occassionally, one of us will run a larger diameter lower pulley only to increase boost levels......most of the time, we'll run an upper pulley only (simple, easy, and cheaper), and the new thing is to run a combination of the two.....aka Postban's suggestion above. Tons of information on this site for you to use to make the decision that fits you. [/QUOTE]
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