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2013-14 Shelby GT500
2013 GT500 black upper pulley?
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<blockquote data-quote="blackshelby" data-source="post: 12296991" data-attributes="member: 83686"><p>please explain......</p><p></p><p>A larger lower pulley will increase belt surface which in theory will <u><strong>increase parasitic drag.</strong></u></p><p>If you are saying that because of weight ,(which really is not drag) the stock pulley and the OD pulley are just about the same.</p><p></p><p>I feel the lower pulley is a better option, which allows you to run a larger upper pulley.</p><p>More belt surface to be able to do work which = less belt slippage which = more airflow.</p><p></p><p>A smaller pulley on the upper makes less power for one reason ( belt slippage) The belt does not have enough surface area to hold the workload.</p><p></p><p>Airflow is power</p><p>If all being equal blower speed (no matter what pulleys are used ) power and torque would be the same.</p><p></p><p> When using anything smaller then a 2.65 upper , there really is not enough surface area to handle the work.</p><p>Yes some swear their belt is not slipping with the small upper but if data logged going down the track and looking at what it does when shifting they would see a whole new picture .(one dyno pull will not show the full picture)</p></blockquote><p></p>
[QUOTE="blackshelby, post: 12296991, member: 83686"] please explain...... A larger lower pulley will increase belt surface which in theory will [U][B]increase parasitic drag.[/B][/U] If you are saying that because of weight ,(which really is not drag) the stock pulley and the OD pulley are just about the same. I feel the lower pulley is a better option, which allows you to run a larger upper pulley. More belt surface to be able to do work which = less belt slippage which = more airflow. A smaller pulley on the upper makes less power for one reason ( belt slippage) The belt does not have enough surface area to hold the workload. Airflow is power If all being equal blower speed (no matter what pulleys are used ) power and torque would be the same. When using anything smaller then a 2.65 upper , there really is not enough surface area to handle the work. Yes some swear their belt is not slipping with the small upper but if data logged going down the track and looking at what it does when shifting they would see a whole new picture .(one dyno pull will not show the full picture) [/QUOTE]
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2013-14 Shelby GT500
2013 GT500 black upper pulley?
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