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Vortech YSi?
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<blockquote data-quote="beefcake" data-source="post: 12055569" data-attributes="member: 1692"><p>i've looked and thought about the ysi</p><p></p><p>i'm a little mixed on it right now.</p><p></p><p>the jt's peak efficiency is 60000 rpms</p><p></p><p>we spin it with the 2.95@ approximately 62,000 rpms. If you look at dyno graphs, it makes peak power at 7500 where we let off.</p><p></p><p>with the 2.75 pulley, we are spinning 65k or so, and it starts to take the jt out of it's efficiency range,</p><p></p><p>it makes about the same hp, however it makes it at closer to 6400, then carries straight out across the band. it doesn't drop off, but doesn't make anymore, torque with the 275 is also up about 50 across the band.</p><p></p><p>my concern with going to the ysi is that peak efficiency is 65,000 rpms.</p><p></p><p>for me, to maximize the blower, i think you would want to spin it between 67,000 and 70,000.</p><p></p><p>Sean K tried the ysi head unit. I don't think it made as much power on the dyno, at least with the 2.95 pulley i think. He tried that head unit in MD and i think he went 9.4's with it.</p><p></p><p>I went a 9.27 in pretty bad air in Michigan last month. I think I can get 8's out of the JT come fall, so I don't think I'm going to swap.</p><p></p><p>I think it would take a 2.60 pulley or so to really get after it, and i'd be worried about slip then, even on a carbonite</p></blockquote><p></p>
[QUOTE="beefcake, post: 12055569, member: 1692"] i've looked and thought about the ysi i'm a little mixed on it right now. the jt's peak efficiency is 60000 rpms we spin it with the 2.95@ approximately 62,000 rpms. If you look at dyno graphs, it makes peak power at 7500 where we let off. with the 2.75 pulley, we are spinning 65k or so, and it starts to take the jt out of it's efficiency range, it makes about the same hp, however it makes it at closer to 6400, then carries straight out across the band. it doesn't drop off, but doesn't make anymore, torque with the 275 is also up about 50 across the band. my concern with going to the ysi is that peak efficiency is 65,000 rpms. for me, to maximize the blower, i think you would want to spin it between 67,000 and 70,000. Sean K tried the ysi head unit. I don't think it made as much power on the dyno, at least with the 2.95 pulley i think. He tried that head unit in MD and i think he went 9.4's with it. I went a 9.27 in pretty bad air in Michigan last month. I think I can get 8's out of the JT come fall, so I don't think I'm going to swap. I think it would take a 2.60 pulley or so to really get after it, and i'd be worried about slip then, even on a carbonite [/QUOTE]
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