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comptech 7lb pulley diameter

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Old 07-19-2005, 08:26 PM
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Default comptech 7lb pulley diameter
can someone tell me the diameter of the 7lb comptech pulley. help appreciated
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Old 07-19-2005, 09:19 PM
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4" I believe.
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Old 07-19-2005, 09:32 PM
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3.5" is the correct size. Sorry Aus.
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Old 07-19-2005, 09:43 PM
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Originally Posted by moparacker,Jul 19 2005, 09:32 PM
3.5" is the correct size. Sorry Aus.
3.5" is 9lbs. I am pretty sure 4" is 7lbs.
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Old 07-19-2005, 09:54 PM
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Well, if I'm wrong, I'm sorry. I just removed a 3.5" pulley from Black Nugget's car and it was presumed to be a 7lb pulley. I'm not sure how to figure this out then...
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Old 07-19-2005, 10:07 PM
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Not saying you are wrong, but if his 3.25" pulley was 9.75 psi, according to the thread he posted the results on.

https://www.s2ki.com/forums/index.php?showtopic=305657
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Old 07-19-2005, 10:14 PM
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Right, but it was calculated to be 12psi. Also, it was very humid outside the few days the tuner had his car. If there's one thing I keep telling BN to get, its a boost gauge. I might try and get a new reading on his boost pressure this weekend, if I can get a temporary gauge to use...

Anyway, that's off subject a bit.
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Old 07-19-2005, 10:21 PM
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So the 9.75 psi was based on a calculation?

If the 3.25" pulley is 12 psi, I would think his numbers would have been a bit higher.
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Old 07-19-2005, 10:31 PM
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No, the 9.75 was true boost during tuning. 12psi was the expected boost pressure with the 3.25" pulley.

We were expecting a bit higher numbers as well.
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Old 07-19-2005, 10:48 PM
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All I know is I was using a 4" pulley and getting 7psi with AC.
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