underdrive pully
On the tree
Joined: May 2004
Posts: 643
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There are several people on here who have dynoed and posted the results in the past. Seeing as the pullies have been around for almost 5 years now most people dont worry about dynoing them to see results when it was confirmed almost 5 years ago.
Originally Posted by N4cer
thanks for the honesty. notice how nobody else responded with actual results? i think they're just repeating claims and ads. got turbonator? haha.
I get a great "DEAL"
on Dyno time, so I dyno before and after every mod. I gained 0rwhp & 0rwtq with The Texas Speed ported TB. And I did gain 12rwhp & 12rwtq with the SLP 25% underdrive pully. 
I just won an SLP pulley w/bolt and alt belt with 300 miles on them(brand new) off ebay for $121.75 shipped!!! I however will not be dynoing to see what I gain because I don't get any deals on that. The guy that sold me it said he couldn't use the pulley for the new supercharger setup but he said it was noticeable gain.
I'm curious if the guys that are not seeing any actual gains are running full accessories. Obviously, someone that is not running AC or power steering would likely not see as much as someone running full accessories (like me). I already have the pulley on my GTO and am wondering if it would be worth the effort to remove the 2 balancer/pulleys and swap them.
