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difference between supercharger
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<blockquote data-quote="Freakingstang" data-source="post: 14947471" data-attributes="member: 90419"><p>A centrifugal blower makes power or boost in a linear curve, so as the RPM increases, so does the boost. but usually as it makes peak HP, it is time to shift. You don't get to use most of the peak HP.</p><p></p><p>Twin screws and Roots blowers are positive displacement. That means for every revolution, it discharges X amount of air. At a higher rpm it is X amount of air, just faster. So that means boost is instantaneous, they produce their full boost by 2000 rpm and will hold that until redline. This is why they make a ton of torque and carry it through the rpm range. the felt tq is used the whole rpm range. the hp is what keeps that power going. the higher you spin them, the hotter the discharge temps will get so cooling the discharge air is a must. </p><p></p><p>I used to be a huge fan of centri blowers, but not after having a couple PD blowers. TQ is instant and much more fun. they just aren't as cheap as a centri blower because most setups that aren't just swapping OEM blowers, involve inter cooling. Most Cenri setups that are cheaper won't have some kind of intercooler, but they also highly benefit from cooling.</p></blockquote><p></p>
[QUOTE="Freakingstang, post: 14947471, member: 90419"] A centrifugal blower makes power or boost in a linear curve, so as the RPM increases, so does the boost. but usually as it makes peak HP, it is time to shift. You don't get to use most of the peak HP. Twin screws and Roots blowers are positive displacement. That means for every revolution, it discharges X amount of air. At a higher rpm it is X amount of air, just faster. So that means boost is instantaneous, they produce their full boost by 2000 rpm and will hold that until redline. This is why they make a ton of torque and carry it through the rpm range. the felt tq is used the whole rpm range. the hp is what keeps that power going. the higher you spin them, the hotter the discharge temps will get so cooling the discharge air is a must. I used to be a huge fan of centri blowers, but not after having a couple PD blowers. TQ is instant and much more fun. they just aren't as cheap as a centri blower because most setups that aren't just swapping OEM blowers, involve inter cooling. Most Cenri setups that are cheaper won't have some kind of intercooler, but they also highly benefit from cooling. [/QUOTE]
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