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Message: <blockquote data-quote="netmatrix" data-source="post: 2332482" data-attributes="member: 217">I'm sort of lost here. For SC the boost is controlled mechanically through pulley size right? And there is no actuator to control the boost. Hence a boost controller is waste of money to install right? Unless you install actuator/ blow off valve to a turbo'ed or moded SC then the boost controller is used to lower the new boost levels right?Sorry ahhh... me newbie... (term from Qiw) heheheThe bicycle sprocket size and gear ratio method seems close enough. But its more reversed. Lets say at the highest gear you need to pedal 10 rotations to get the wheel to move in 1 rotation. And the lowers gear u need only 2 pedal rotations to get the wheel to move in 1 rotation.For SC if you use small pulley, the SC would only rotate at a lower or same with engine speed. But if you install a larger pulley, the SC would turn faster. Look ate the core rotation, not the outer rim rotation. Hence boost comes early and u can gain a little more air velocity than stock because of SC operating at higher speed. And then you need to upgrade bearings for higher SC rpms and probably check the SC lubrication more frequently. But i dunno la, i don't have SC engine. shamburke would probably be a better sifoo at this. Me, just paper guy only.</blockquote>

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