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I've been trying to decide on Feuling 525 or S&S 509 cams for my 00 Ultra Classic upgrades. I've read multiple threads on multiple forums and peoples happiness with either set of cams seem pretty balanced.
I came across these dyno sheets at Rollies, my question is what causes that larger dip with the 509 cams in that 2500-4000 range?
That midrange dip is usually caused by exhaust. I dont see mention of what pipe was used and if the same on each dyno but some pipes react differently to cams or overall builds. Now that Im older I tend to not look at the peak power numbers and more the average hp/tq in the rpm range I ride in, the more flat the torque curve the better IMO
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Dyno chart question
