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Underdrive Pulleys

Old Jul 31, 2010 | 08:33 AM
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Default Underdrive Pulleys Review

Saw these on ebay. The specs sound decent.
http://cgi.ebay.com/ebaymotors/03-04...Q5fAccessories

Developed by Vision Motorworks using the latest in CAD design and then CNC machined from a solid piece of 6061 Aluminum billet.
- HARD COATED: Vision Motorworks hard coats all high wear surfaces to increase pulley life. Surfaces are hardened to 65 Rockwel "C" scale. Harder than steel, and two times harder than forged aluminum!
- Will increase Horsepower & torque across entire RPM range.
- CNC machined.
- Reduces the weight at the crankshaft (an average of 2.7 HP is gained from every pound lost off the crank shaft), and parasitic drag loses of the accessories thereby increasing horsepower and torque.
- EXCEEDS ALL OEM belt fitment, alignment and balance specifications.
- Very light for MAXIMUM weight loss at the crank.
- Crank pulleys underdrive all the accessories about 15-20% for maximum horsepower gains without any cooling or charging issues.
- Polished aluminum.



Last edited by Escobar; Aug 9, 2010 at 12:09 PM.
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Old Jul 31, 2010 | 09:28 AM
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For the money I would just find a used set of UR's.... Bust just my .02
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Old Jul 31, 2010 | 02:05 PM
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So these are crap?
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Old Jul 31, 2010 | 02:35 PM
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Originally Posted by Escobar
So these are crap?

I would not personally say that about a product I have not tried or seen a reputable review about.

I have used UR products and they make great pulleys. For my money I would rather go with a proven product.

If you do get them write up a review so people know if these are a good buy.
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Old Jul 31, 2010 | 02:36 PM
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i think those are the ones i have on my car?. its been a while since i installed still good..
im pretty sure there it.

Last edited by CircleHeartX; Jul 31, 2010 at 02:39 PM.
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Old Jul 31, 2010 | 03:02 PM
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The seller has really good feedback... If your on a budget then go for it, they make power.
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Old Jul 31, 2010 | 03:43 PM
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yea thats what im thinking, was just seeing if anyone else is running them...
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Old Jul 31, 2010 | 03:45 PM
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Originally Posted by hwcustoms
I would not personally say that about a product I have not tried or seen a reputable review about.

I have used UR products and they make great pulleys. For my money I would rather go with a proven product.

If you do get them write up a review so people know if these are a good buy.
Good point, I went ahead and just bought them, for that cheap its all good. I'll post a review when I install them.

Last edited by Escobar; Jul 31, 2010 at 05:31 PM.
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Old Jul 31, 2010 | 06:01 PM
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Why do they bother to mention that they are CNC machined? Isn't everything now? What do they think we think they hand turn them on a lathe?
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Old Jul 31, 2010 | 10:02 PM
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Originally Posted by phreaktor
Why do they bother to mention that they are CNC machined? Isn't everything now? What do they think we think they hand turn them on a lathe?
you never know it just sounds more professional
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Old Aug 1, 2010 | 12:52 AM
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they work for me and i did fell a difference..now im just use to them
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Old Aug 1, 2010 | 08:54 AM
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Originally Posted by CircleHeartX
they work for me and i did fell a difference..now im just use to them
good to know
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Old Aug 2, 2010 | 04:57 PM
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It says I need a smaller belt, do you guys know what length?
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Old Aug 2, 2010 | 06:04 PM
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Shouldn't they know? Makes you wonder
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Old Aug 2, 2010 | 09:29 PM
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Good point, I will send them a message.
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Old Aug 3, 2010 | 09:29 AM
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For reference here are the belt numbers:
• Alternator, Power Steering and Idler Belt: Gates K060441
• Air Conditioning Belt: Gates K040347
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Old Aug 3, 2010 | 10:57 PM
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it should tell you..they also should tell you?? haha im to lazy to go looking for it but if you need the numbers ill get it for you i still have the gates box they came in
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Old Aug 4, 2010 | 07:13 AM
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Originally Posted by CircleHeartX
it should tell you..they also should tell you?? haha im to lazy to go looking for it but if you need the numbers ill get it for you i still have the gates box they came in
Im sure it does when it comes with the instructions, if not ill send you a pm
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Old Aug 4, 2010 | 08:45 AM
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i have been debating doing pulleys, but it sounds like they are all bad. if i were going to get some I sure wouldn't cheap out on them, cause that's a pretty important part on your engine.
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Old Aug 4, 2010 | 08:24 PM
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There is a oil seal that you have to be careful with I believe. Anyone back me up on that? The crank oil seal..
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