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Old 11-27-2006, 08:21 PM   #1
WebMasterP
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Default Worx Tuning Low Mass Crank Pulley

I was always curious as to how much these helped. Word of mouth is nice, but it never really tells you much. So, I threw together this video a while ago and then forgot to post it up.

So, here it is:

http://www.youtube.com/watch?v=e5VPh9LqjaI

Don't take it for an exact science. Remember, I had to press and let off the pedal with my foot, so it's not like this is 100% perfect. But the overlay should be helpful to some people. Enjoy!
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Old 11-29-2006, 03:49 PM   #2
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75 views but no comments? Where's the love/hate?
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Old 11-29-2006, 06:26 PM   #3
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neat video
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Old 11-29-2006, 07:48 PM   #4
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anybody else have experience with these? they look nice!
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Old 12-01-2006, 03:30 PM   #5
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Quote:
Originally Posted by jgp View Post
anybody else have experience with these? they look nice!
If you look around there is a lot of talk about lightweight pulleys (do these actually work, do they break stuff, etc).

Everyone seems to say:

1) They don't break stuff.

2) They "think" they make a difference.

That's why I made the video. So I could answer #2. It DOES make a difference, even on an STI.

When I first put it in, I could feel a little extra go (from the reduced weight). Now, I'm either used to it, or the CPU compensated and I can't tell anymore.
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Old 12-02-2006, 02:27 AM   #6
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Nice.
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Old 12-02-2006, 04:32 AM   #7
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thats nice...it def gives you a couple extra 100 rpms. its a mod you can feel leaving the driveway to go to work as well as coming out of a corner off boost at the track.
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Old 12-02-2006, 11:45 AM   #8
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Thanks for posting that..

that's pretty much what i was looking for.


(like most mods...as soon as you get used to them you need more !!)
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Old 12-02-2006, 11:56 AM   #9
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Nice video. I never understood the ones that said it wasn't worth it.
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Old 12-14-2006, 03:26 PM   #10
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Good stuff, much appreciated.
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Old 12-14-2006, 06:12 PM   #11
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Thanks for the nice comments guys. It took me a bit to create the video, so it's good to get some feedback about it.
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Old 12-14-2006, 06:56 PM   #12
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Great video man. Was wondering how were you going to compare the 2 in the vid. And you did it in a way I wouldnt expect. Great vid very nice job. Thanks for posting it.

-Brian
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Old 12-18-2006, 12:42 PM   #13
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Quote:
Originally Posted by IIdiceII View Post
coming out of a corner off boost at the track.
That is the real benefit in a light weight pulley
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Old 12-19-2006, 01:18 AM   #14
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I love how everyone says the pulleys haven't damaged an engine yet...

How exactly do we know this? because some email from subaru tells us it shouldn't happen? I had the unorthodox unit and my stock 00rs engine spun a bearing at 93k... pulley installed at about 60k. Was it the pulley? Was it my driving? Was it my care for the engine? Was it excessive speed for prolonged periods of time? Its most impossible to tease out a single or exact cause.

I do know 3 other engines with pretty much the same story- 00-01rs engine+ pulley and subsequent early bearing failure (75-100k miles).

Also, this "FAQ" should really have some mention of the data that Cobb( i think it was Cobb) did that showed harmonics of both stock and lightened pulley. Thing I remember was that the lightened one actually smoothed out a lot of the vibration, however, it introduced a spike at some rpm in the 6k range. Could that be a problem? Again its not really clear.

What I'm trying to get at is that there may be something about a lightened/underdriven pulley that is detrimental to the harmonics and inturn, the bearings. Does it necessarily manifest in catastrophic failure in every engine its used on? No, most definately not because there is the undisputed fact that many cars have no problems, BUT has it been suspect in some failures? Yes i think so. Is it shortening bearing life? Is it basically increasing wear in varying amounts? Who knows because how could you tell whether an engine should last to 200k vs. 150k? Perhaps its like smoking- will u get lung cancer after a year of smoking? Not likely, but keep smoking and eventually you probably will.
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Old 01-06-2007, 02:27 AM   #15
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So we should all get our internals professionally fully balanced and worry less.
And the amount that would cost us would hinder our modding funds and prevent more potential hazards. Time to start saving up.
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Old 01-06-2007, 03:58 AM   #16
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nice work on the video.
Lightened flywheel video would be awesome.
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Old 01-17-2007, 06:42 AM   #17
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Quote:
Originally Posted by scoogan View Post
Nice video. I never understood the ones that said it wasn't worth it.
U can't understand stupid people, silly!
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Old 02-02-2007, 01:22 PM   #18
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Underdriven pulleys are smaller, not larger. I don't think anyone would actually sell larger ones. That being said, lighter/stock size is the way to go.
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Old 02-02-2007, 01:31 PM   #19
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How about Go Fast Bits' full lightened pulley set vs [any reputable company]'s lightweight crank pulley? I know gruppe-s sells the full set.

Would the reduced weight on accessory pulleys help at all?
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Old 02-02-2007, 04:07 PM   #20
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Quote:
Originally Posted by imma_stocker View Post
How about Go Fast Bits' full lightened pulley set vs [any reputable company]'s lightweight crank pulley? I know gruppe-s sells the full set.

Would the reduced weight on accessory pulleys help at all?
I imagine it would. The more you decrease the rotational mass, the more the reduction in work the engine has to do.

I used to run a website where I would compare computer hardware, so this kind of testing comes pretty natural to me. I'd test more things, but I can't afford to buy all the parts.
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Old 02-02-2007, 04:15 PM   #21
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Quote:
Originally Posted by shemoves View Post
Underdriven pulleys are smaller, not larger. I don't think anyone would actually sell larger ones. That being said, lighter/stock size is the way to go.
I believe you are wrong. The underdriven refers to underdriving the alternator, ie slowing it down so it creates less resistance. Since velocity (v) equals radius (r) times rotation speed (w), and V (belt speed) is constant, r must increase to decrease w.


EDIT: This thread has long since passed but figured i'd clarify something anyways. I was thinking about a pulley put onto the alternator itself (like the 3 piece GFB set), not the crank pulley. Sorry.

Last edited by Mechie3; 05-31-2007 at 12:55 PM.
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Old 02-04-2007, 01:23 AM   #22
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Quote:
Originally Posted by Mechie3 View Post
I believe you are wrong. The underdriven refers to underdriving the alternator, ie slowing it down so it creates less resistance. Since velocity (v) equals radius (r) times rotation speed (w), and V (belt speed) is constant, r must increase to decrease w.
Sorry sir, but I'm pretty sure this deserves a flat-out NO. The crank pulley is underdriven. So, every single rotation of the crank results in less belt travel. Hence, underdriven title is accurate. Pulleys are smaller and belt is shorter so crankpulley receives less resistance. This decreased resistance also results in the alternator, power steering, AC, etc. being underdriven as they do not rotate enough to fully drive the system.

Nice try with the math. Velocity=distance/time. Time is the constant as it is the hardest thing to manipulate, so we must adjust the distance. How do we adjust the distance? Correct, using a smaller pulley with a decreased radius and decreased circumference.
This with force=mass x velocity with a decreased velocity means the decreased velocity leads to less force(resistance) on the engine. This is also why low mass pulleys reduce the force as well. So you free more hp that is already there by reducing the resistance. Torque is not so important here as they are only accessories and little if anything will happen from slightly less tq.

disclaimer: I'm pretty sure F=MV, it may =mass x acceleration but I think that actually has a slighty different equation.
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Old 02-04-2007, 04:30 AM   #23
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Where did you purchase your pulley?

MT
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Old 02-04-2007, 06:48 PM   #24
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Quote:
Originally Posted by Mechie3 View Post
I believe you are wrong. The underdriven refers to underdriving the alternator, ie slowing it down so it creates less resistance. Since velocity (v) equals radius (r) times rotation speed (w), and V (belt speed) is constant, r must increase to decrease w.

LOL.
underdriven crank pulley are smaller.
Underdriven accessory pulleys are larger.

Some kits come with smaller everything to reduce mass but keep the same speeds.
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Old 02-05-2007, 02:09 AM   #25
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sweet video! The worx pulley is on my list... along with a lot of their other products. I like their stuff
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