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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Whipple pulley upgrade
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<blockquote data-quote="Biggest" data-source="post: 553285" data-attributes="member: 11768"><p>I had a lenghtly conversation with whipple yesterday with regards to pulley sizes.</p><p>They ship their 2.9 kits with the 3.5 inch pulley, as explained by whipple, no two vehicles are alike. They claim that they can take two identical raptors or any two vehicles for that matter, put the same SC on and both vehicles can produce different power and different boost. </p><p>They offer pulleys that range from 3.75 to 2.75 in size, they small you go the more boost produced, there is no exact science as to how much boost will be gained with each drop in size, although the average is 1 lb per drop in pulley size. </p><p>They sell the Raptor kit with the 3.5 pulley as it's the size they feel is best size based on the various studies, tunes, and tested done. </p><p>The next two sizes down are 3.375 and 3.250 they can be used with the same belt that they provide, smaller sizes ( 3.125 to 2.75 ) will require a different belt. </p><p>They recommend that the initial install be with the stock 3.5, the vehicle tested and boost measured, once your boost is determined you can then opt to change pulley sizes in order to increase / decrease boost. </p><p>All of the above pertains to the tune that they sell. </p><p>If you have a different tune ( Livernois , JDM, Loonie tune) or other you can follow the same guidlines. </p><p></p><p>R</p></blockquote><p></p>
[QUOTE="Biggest, post: 553285, member: 11768"] I had a lenghtly conversation with whipple yesterday with regards to pulley sizes. They ship their 2.9 kits with the 3.5 inch pulley, as explained by whipple, no two vehicles are alike. They claim that they can take two identical raptors or any two vehicles for that matter, put the same SC on and both vehicles can produce different power and different boost. They offer pulleys that range from 3.75 to 2.75 in size, they small you go the more boost produced, there is no exact science as to how much boost will be gained with each drop in size, although the average is 1 lb per drop in pulley size. They sell the Raptor kit with the 3.5 pulley as it's the size they feel is best size based on the various studies, tunes, and tested done. The next two sizes down are 3.375 and 3.250 they can be used with the same belt that they provide, smaller sizes ( 3.125 to 2.75 ) will require a different belt. They recommend that the initial install be with the stock 3.5, the vehicle tested and boost measured, once your boost is determined you can then opt to change pulley sizes in order to increase / decrease boost. All of the above pertains to the tune that they sell. If you have a different tune ( Livernois , JDM, Loonie tune) or other you can follow the same guidlines. R [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Whipple pulley upgrade
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