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Old 09-29-2010, 12:24 PM   #1
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Crank & Power sterring underdrive pulley upgrade

www.cheetahonline.com
They sell two pulleys for 986. $100 & $200. Sounds good for the 10 + HP & no check engine light.
I figured while you have the compartment opened up, might as well cahnge both.
Anyone tried this?
Sounds like a win/win situation with no down side.

Thanks Rich

Last edited by RDS911; 09-29-2010 at 12:39 PM.
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Old 09-29-2010, 12:31 PM   #2
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Underdriving the crank will underdrive ALL accessories, including the PS pump obviously, so also underdriving the PS pulley may be too much.....
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Old 09-29-2010, 12:38 PM   #3
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Why would it be to much on the power steering side with booth pulleys. Seems like the total rotational mass loss would be good for everything?

Thanks
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Old 09-29-2010, 01:02 PM   #4
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Oops! A smaller pulley on the PS pump will turn it FASTER, killing the PS pump faster. Maybe not a good plan.

Last I heard Cheetah was not returning calls/emails from customers. Buyer beware!
issues buying from Cheetah Online
DME's for sale
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Last edited by Topless; 09-29-2010 at 01:11 PM.
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Old 09-29-2010, 01:21 PM   #5
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The "underdrive" ps pump pulley is larger than stock in diameter...
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Old 09-29-2010, 01:36 PM   #6
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Quote:
Originally Posted by Fluellen
The "underdrive" ps pump pulley is larger than stock in diameter...
Hmmmm, I wonder why they put this in their ad then:

"Also, these pulleys are made with a smaller diameter than the stock pulley. This rotates the belt driven accessories at a slightly slower pace (around 10-13% slower). Since each accessory takes power to turn, hp and torque are regained through the "underdriving" process also."
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Old 09-29-2010, 02:00 PM   #7
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Yeah, that text part is probably supposed to just refer to the crank pulley. The ps pulley description refers to a larger _belt_ diameter, whatever that may mean... probably a typo as well...
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