How Much HP With Pulley?

[Ryan02z]

How much horsepower would a pully add in rwhp? Suppose doing this with a cam install would be the best choice since the harmonic balancer needs to come off either ways

[MasterZ28]

I heard it does help parastic loss but adds maybe 1-2rwhp to your ls1. I have not read any before and after dyno results.

[youngrigo aka NVEEOUS]

IMO i think they cost to much for the minimal gain you get..... Just my .02

[RrCoX22]

i suppose if your doing a cam swap it's worth it since you need to take off the harmonic balancer either ways... only reason I could see it being beneficial for the minimal gains. but then again every little bit helps

[Transamthunder]

Underdrive pullies in general don't give back enough to warrent the expense. On top of that you run into the possibilty of not charging your Battery to full. Better of saving the money for getting more air in and out, be it headers, cam and heads or what have ya.

[99Hugger]

I've never had any charging problem. Very noticeable difference with the revs though. Just like every other bolt on, they don't gain much HP individually but they all add up.

[youngrigo aka NVEEOUS]

IMO it would be one of the last mods i would do! Like if you did everthing else and only had this left to do!

[Edward-T]

i noticed it revved a little quicker but other than that i didnt really see any differance, just get the rpm's faster.