under drive pulleys
Thread Starter
On The Tree
Joined: Sep 2011
Posts: 129
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From: waterloo,al
under drive pulleys I was just curious to who is using under drive pulleys? do you like them? what brand? could you tell any difference in track times? I used them a lot years ago when I ran fox body mustangs and have read several articles in the mustang magazines with dyno numbers to show the results. I'm just curious about the use of them for the f-bodys to see if it was worth the time and money.
I have personally ran and installed so many I cannot count really. Powerbond is the best bang for the buck. We have them ready to go for any of the LS accy applications. Fbody/GTO, Truck/Gen5 camaro, Vette/CTS-V/G8 and even the LS7s.
For the money you spend and the power you get and reliability, its a no brainer. $200 for 7-10 hp seems pretty good to me, and again the reliability is alot better than gm.
For the money you spend and the power you get and reliability, its a no brainer. $200 for 7-10 hp seems pretty good to me, and again the reliability is alot better than gm.
TECH Enthusiast
Joined: Nov 2012
Posts: 555
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From: NearHouston, TX
I installed a BBK, it was cheap and had a buddy that owns a shop put it on my A4 LS1. No way I could have done it on my own, I tried but needed a lift to get under it good, and air tools to get it off and on. BBK instructions said to use existing belts, well it took 2 seconds to figure out that wasn't going to work. Ended up using a 76" (p/n. 760K6) and 37" (p/n. 370K4) from Auto Zone or OReilly's, can't remember.
Oh yea, I wanted to add, when we removed the original pulley, it had a big hunk of the flange missing, like a rock or debris flew under car and damaged the hell out of original, so I was pretty happy I went with the reduced pulley since it needed to be replaced anyway
Oh yea, I wanted to add, when we removed the original pulley, it had a big hunk of the flange missing, like a rock or debris flew under car and damaged the hell out of original, so I was pretty happy I went with the reduced pulley since it needed to be replaced anyway
Last edited by RJDio; Apr 4, 2014 at 01:39 AM.
The vettes are bad about them separating, but hey have odd issues quite a bit. I have seen a few fail on the fbodies, but that is it. Quite a few get damaged from debris and you never realize it until you either start eating belts or do a cam swap.
If you have ever done one, then doing another is a piece of cake. Rule of thumb is to always use a new crank bolt, be it stock or ARP style.
If you have ever done one, then doing another is a piece of cake. Rule of thumb is to always use a new crank bolt, be it stock or ARP style.
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Launching!
Joined: May 2012
Posts: 282
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From: Wisconsin
I've read a lot of the old threads on underdrive pulleys and it seems like most people recommend them yet some have had issues or failures.
I'm getting my headers, ory, and tune in the next few weeks and I'm considering getting a underdrive pulley also
I'm getting my headers, ory, and tune in the next few weeks and I'm considering getting a underdrive pulley also
An underdrive will have almost zero effect on tune so there is no rush to get one before your tuned up.
That being said the ATI's are always a good way to go. They are more expensive but that's because it is a true harmonic balancer just like the Innovators West pulleys. I am going procharged so I need a good strong pulley I just have not decided which way I'm going. The ATi is a little cheaper than the IW stuff. Converting so 8 rip is spendy.
That being said the ATI's are always a good way to go. They are more expensive but that's because it is a true harmonic balancer just like the Innovators West pulleys. I am going procharged so I need a good strong pulley I just have not decided which way I'm going. The ATi is a little cheaper than the IW stuff. Converting so 8 rip is spendy.
Define a "true" harmonic balancer.
The ASP is an issue because it uses an alum hub and they are poor quality. Quite a few bought cheap ones and they were one solid piece. Def no good. I have had zero problems with the PB I have installed and not heard of any of them failing. I have had problems with other companies, but I am not here to run them through the mill.
The ASP is an issue because it uses an alum hub and they are poor quality. Quite a few bought cheap ones and they were one solid piece. Def no good. I have had zero problems with the PB I have installed and not heard of any of them failing. I have had problems with other companies, but I am not here to run them through the mill.
The amount of bs all alum pullies for the mod motors is ridiculous. But they are def not worth as much power gain on them as they are on the ls cars. Even the sbc and lt1s dont gain as much really.
So you're saying the LS motors respond better than the others to this mod? It actually made a measurable difference on my 04 gt. Before the swap my brother and I were practically dead even in his 06 gt, and after the UDP swap I would consistantly pull him ever so slightly. We did several runs to confirm
