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Harley-Davidson™ F-150
the shop says they can only do upper
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<blockquote data-quote="c6zhombre" data-source="post: 13867749" data-attributes="member: 76381"><p>Yes, slip is the issue and also when you do the upper, you lose the stealthiness of the pulley mod because people will obviously see that upper if you pop the hood. The pulley they're adding and charging you extra for is called a "snub" idler and it's there to pinch that belt and prevent slip that the smaller upper creates. That's why the lower only change is cool because that snub idler expense and appearance is not needed at all. </p><p></p><p>There is also a theory swapping the lower instead of upper creates a bit more torque reading on the dyno than an upper swap lb for lb of boost. I'm not sure if I buy into that, but you'll probably hear that if you research this some more.</p></blockquote><p></p>
[QUOTE="c6zhombre, post: 13867749, member: 76381"] Yes, slip is the issue and also when you do the upper, you lose the stealthiness of the pulley mod because people will obviously see that upper if you pop the hood. The pulley they're adding and charging you extra for is called a "snub" idler and it's there to pinch that belt and prevent slip that the smaller upper creates. That's why the lower only change is cool because that snub idler expense and appearance is not needed at all. There is also a theory swapping the lower instead of upper creates a bit more torque reading on the dyno than an upper swap lb for lb of boost. I'm not sure if I buy into that, but you'll probably hear that if you research this some more. [/QUOTE]
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Harley-Davidson™ F-150
the shop says they can only do upper
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