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SVT Shelby GT500
10% under drive or a 2.75”
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<blockquote data-quote="Catmonkey" data-source="post: 16360567" data-attributes="member: 124025"><p>I've heard that too, but it's a mechanical ratio, so I can't see there's any real truth or benefit to it. There might be an inkling of belt slip on the hit that might account for that contention. Now the crank to blower ratio will be different. An ATI 10% will give you another 0.8% more rpm on the blower over the 2.75" pulley, and the IW will you 2.6% more rpm on blower speed over the 2.75" pulley. The IW 10% is more like 12% overdrive.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16360567, member: 124025"] I've heard that too, but it's a mechanical ratio, so I can't see there's any real truth or benefit to it. There might be an inkling of belt slip on the hit that might account for that contention. Now the crank to blower ratio will be different. An ATI 10% will give you another 0.8% more rpm on the blower over the 2.75" pulley, and the IW will you 2.6% more rpm on blower speed over the 2.75" pulley. The IW 10% is more like 12% overdrive. [/QUOTE]
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SVT Shelby GT500
10% under drive or a 2.75”
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