Underdrive pulley's.........?
Thread Starter
Burning Brakes
Joined: May 2008
Posts: 909
Likes: 2
From: Orange County, CA State of Confusion
Underdrive pulley's.........?
Anyone running these on the street? I have a '07 A6 that see's occasional dragstrip action.
Any problems either inherent (as in underdrive/overdrive pulley applications) or experienced by anyone with the C6?
What performance gains has anyone realized if any?
Any input is appreciated.............
Any problems either inherent (as in underdrive/overdrive pulley applications) or experienced by anyone with the C6?
What performance gains has anyone realized if any?
Any input is appreciated.............
Burning Brakes
Joined: Jan 2007
Posts: 1,093
Likes: 0
From: Dallas TX
UD pulleys will be good for maybe 5-8hp. The reason you don't see many people talk about them is because they are hard to replace. Unless you do a cam install, which requires taking the stock pulley off, is is not worth the price of installing. The install of the pulley would cost more than the pulley itself. However, if you are going to do a cam swap than a pulley is a good idea because it won't cost any extra to install it. As far as the pulley itself, you just got to be careful and make sure it is aligned correctly.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
March pulleys merged with Fluiddampner, and Made a 12 hp ud pulley
with a balancer built in. I'm ready to try one, You have to remove
the steering rack so it will be a liitle fun. I have done a few others and always
was happy withe the results.
with a balancer built in. I'm ready to try one, You have to remove
the steering rack so it will be a liitle fun. I have done a few others and always
was happy withe the results.
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
PowerBond
I have a PowerBond u/d pulley which seemed to be equal in quality to the others at a very reasonable price. Mine went on w/ cam, so no real b/f & a/r #s. I will tell you all the Hp guys swear by them & there's lots of info stating 8-10 hp gains over & over. My personal experience has been positive & the car hasn't suffered any ill effects to the charging system or accessories. My car, an 05 6MN w/ a mild cam only, & with the usual bolt ons posting 450+rwhp. I am firmly of the opinion the difference between the good performing cars & the exceptional ones is the sum total of well thought out & synergistic mods. An underdrive pulley would be one of those mods worth doing w/ a cam & a few others. Done alone, specifically w/o changing the cam it may not be worth the trouble given it is fairly labor intensive compared to gains from a FAST intake or headers for the amount of work.
Racer
Joined: Aug 2006
Posts: 357
Likes: 1
From: Sterling VA
It's not as hard as some people make it out to be. Haven't done it on a Vette, but I installed the PowerBond on my GTO and it wasn't hard at all. Like someone else said, good for around 5-8hp or so and the price isn't bad. If you do it yourself, then it's definitely worth it....if you are going to pay to have it done, then wait until/if you decide to do a cam. A ported stock intake manifold will gain a bit more power for near the same price, and will take less time to install. Just my .02
-Brian
-Brian
Team Owner
Joined: Feb 2001
Posts: 27,252
Likes: 131
From: Short Hills, NJ
Because it's on there tight, you certainly don't want it coming off do ya? LOL 
Plus there are other things that have to be removed/moved out of the way to access that area, it can be a tedious procedure but not too bad, proven gains too.
Plus there are other things that have to be removed/moved out of the way to access that area, it can be a tedious procedure but not too bad, proven gains too.
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Safety Car
Joined: Dec 2005
Posts: 4,157
Likes: 37
From: North Carolina
St. Jude Donor '07-'08-'09-'11-'12
I just got the Powerbond with the crank bolt and belt from forum sponser Byunspeed for $200 delivered....cheapest price I could find and had it in just a day or two.
Drifting
Joined: Feb 2007
Posts: 1,844
Likes: 12
From: Alpharetta Georgia
I will say that my car definitely has a harder time keeping the really cool coolant temps that it used to be able to do with the stock pulley. I am far from running hot, but it is the only thing I have noticed a difference in.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,403
From: Bethesda MD
Did you raise your idle speed when you put the cam in? A 750 rpm idle speed would just about restore the accessories to the stock speed.
Drifting
Joined: Feb 2007
Posts: 1,844
Likes: 12
From: Alpharetta Georgia
now 102 is really hot
