Underdrive pulley, any gains on stock
I'm looking at optimizing the power of my stock 2002 Z06. I have seen under drive pulley upgrade packages claiming increase in power. Is there any truth to this and is the power increase worth the money?
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I think its good for 3-5 rwhp... I remember a few people dynoing their cars before and after installing an ASP underdrive pulley many years ago and that was the average. I ran one on my previous cars... not even sure if they make one for the LS7.. something I should look into myself.
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I purchased one for my current 414ci.... Powerdyne...
IMO if you are going to change out UD pulley you may as well throw a cam up in there... ;)
Originally Posted by PeteZ06
(Post 1585898510)
I think its good for 3-5 rwhp... I remember a few people dynoing their cars before and after installing an ASP underdrive pulley many years ago and that was the average. I ran one on my previous cars... not even sure if they make one for the LS7.. something I should look into myself.
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Originally Posted by 0H1Z06
(Post 1585899489)
I purchased one for my current 414ci.... Powerdyne...
IMO if you are going to change out UD pulley you may as well throw a cam up in there... ;) My LS7 is heads and cam but just a super small cam, I ran aggressive cams for too long in my previous cars that I really just wanted something tamer this round. Maybe one of these days I'll put in a healthy cam, get a LSX intake and drop my cats and break the 600+rwhp mark :thumbs: |
you know what I meant PeteZ06....:thumbs:
I am opting for the aggressive cam, ported LSX intake, different fuel system, TEA's, Calloway Honker... etc, blahze,... I am chasing the 600 mark that you speak of.... Sorry to get off topic to the OP.... A "pulley" will be nice.... and inexpensive...:rofl:
Originally Posted by PeteZ06
(Post 1585901487)
You mean a real cam? :D
My LS7 is heads and cam but just a super small cam, I ran aggressive cams for too long in my previous cars that I really just wanted something tamer this round. Maybe one of these days I'll put in a healthy cam, get a LSX intake and drop my cats and break the 600+rwhp mark :thumbs: |
I just installed one on my hot rod. Ill post the hp gains in a week or two.
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I installed one when my stock one started wobbling and threw the belt. I don't have a before and after dyno but I will say there was no negative side effect.
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I have always thought that the reason for under drive pulleys was so that you don't damage the alt/ac compressed from extended hi RPM runs. I was also told that if you are using your car for daily driving (commuting ect) you run the risk of not getting enough spin on the alt to properly keep the charging system at need levels.
Mark. |
Is 3-5hp worth the hours of labor to just install a damper? (You need to move the steering rack out of the way to change the crank pulley. If you haven't done that yet, it's a pain in the a$$.) Like stated above, if you're going in that deep, you might as well spend the extra hour or two and swap the cam (and springs... and pushrods... and injectors.... and put on a FAST 92 and LS2 throttle body... and AFR heads....).
It's a never-ending series of "while I'm at it...". |
Originally Posted by Scooter70
(Post 1585925601)
Is 3-5hp worth the hours of labor to just install a damper? (You need to move the steering rack out of the way to change the crank pulley. If you haven't done that yet, it's a pain in the a$$.) Like stated above, if you're going in that deep, you might as well spend the extra hour or two and swap the cam (and springs... and...
It's a never-ending series of "while I'm at it...". |
Originally Posted by Moto One
(Post 1585925269)
I was also told that if you are using your car for daily driving (commuting ect) you run the risk of not getting enough spin on the alt to properly keep the charging system at need levels.
Mark. |
Originally Posted by Medic949
(Post 1585896077)
I'm looking at optimizing the power of my stock 2002 Z06. I have seen under drive pulley upgrade packages claiming increase in power. Is there any truth to this and is the power increase worth the money?
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