What you really want is to have your damper manufacturer to have worked with the manufacturer (Ford) to design the damper such that the critical dampening characteristics are retained while the accessories are slowed.
I'm not trying to be a smart ass, but didn't Steeda do that with Ford?
UPR and Summit pulleys are built the same way. As are Innovators West, ATI and a couple of independants.Sorry for the short/smart-ass answer. It would probably help for you to hear why.
The reason for the Steeda's isn't because of the steel vs aluminum. It's because the Steeda crank pulley comes with its own SFI certified harmonic dampener. No one else's does, that I'm aware of.
The fact that piggybacks use the original damper as engineered by Ford and validated by Ford engineers in thousands of hours of dyno cell testing makes piggybacks the only damper style I'd consider.
Good luck with that philosiphy man. LOL.
Back before I stopped buying from RPM Outlet, I put a set of their under drive pulleys on. I don't know who makes them for RPM Outlet. They too have an SFI approved harmonic dampener on them. I have had them on for 2 years with no problems. If I did have to buy another set though, I would go with the Steeda's. As every one else said. Stay away from the piggy back deals.
Were the gains noticeable? A little. Would I buy them again? Probably not but, they came in one of their packages. I think it's one of those mods that compliment a few other bolt ons.
Spend the money one some good control arms or something else. What mods do you have already?
I'd prolly add that money to like a Mazier (sp?) electric water pump or something. Not only will it likely reduce parasitic drag more than a 20% underdrive (just a guess) but I've always liked the idea of circulating coolant through the motor for 15 - 30 seconds after engine shut-down.
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