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2013-14 Shelby GT500
2013 GT500 black upper pulley?
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<blockquote data-quote="blackshelby" data-source="post: 12298390" data-attributes="member: 83686"><p>Weight is not the reason for the torque increase.</p><p>That is directly due to blower speed with less belt slippage.</p><p></p><p>Actually moving the weight away further from the the center of the crank will take more HP to turn . You always want the weight of a spinning object closer to the center if you are taking parasitic drag into consideration.</p><p>If you weigh the stock and a 10/15 percent OD pulley, the 10/15 percent is actually a couple ounces heavy than the stock pulley. </p><p></p><p>(Edit: The OD lower pulley is lighter than the heavy 2007 OEM pulley but heavier than the 08 -13' OEM lower pulley)</p><p></p><p></p><p>Don't they make aftermarket idlers that increase belt wrap on the snout?</p><p></p><p>Yes they do and they work pretty well, why because they are making the belt wrap around the pulley more(More work area to hold= less slippage).</p><p>There is a point to where you just can't get enough surface with the smaller pulley to carry the workload, especially when you are spinning the blower with an OD crank pulley already and using small upper. You have have a better chance of the smaller upper working if you do not run the lower crank, why less depend of the upper pulley (Blower speed)</p></blockquote><p></p>
[QUOTE="blackshelby, post: 12298390, member: 83686"] Weight is not the reason for the torque increase. That is directly due to blower speed with less belt slippage. Actually moving the weight away further from the the center of the crank will take more HP to turn . You always want the weight of a spinning object closer to the center if you are taking parasitic drag into consideration. If you weigh the stock and a 10/15 percent OD pulley, the 10/15 percent is actually a couple ounces heavy than the stock pulley. (Edit: The OD lower pulley is lighter than the heavy 2007 OEM pulley but heavier than the 08 -13' OEM lower pulley) Don't they make aftermarket idlers that increase belt wrap on the snout? Yes they do and they work pretty well, why because they are making the belt wrap around the pulley more(More work area to hold= less slippage). There is a point to where you just can't get enough surface with the smaller pulley to carry the workload, especially when you are spinning the blower with an OD crank pulley already and using small upper. You have have a better chance of the smaller upper working if you do not run the lower crank, why less depend of the upper pulley (Blower speed) [/QUOTE]
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2013-14 Shelby GT500
2013 GT500 black upper pulley?
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