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10psi pulley VCS

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Old Sep 3, 2006 | 01:04 PM
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Default 10psi pulley VCS
i just installed my 10 psi pulley and it only reads 8.2 psi at 9100rpms on the AEM EMS


what you guys suggest? is there anything i need to do so it will reach 10 psi?

thanks
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Old Sep 3, 2006 | 01:25 PM
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do u have a aftercooler because it should read about .5 less boost. But if you have an EMS you can always raise the redline a little to get the full boost
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Old Sep 3, 2006 | 02:39 PM
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Altitude and any cylinder head porting, CR change will effect the Max boost reading. Any other mods to the engine? What altitude do you live at? Is the belt tight?
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Old Sep 3, 2006 | 03:22 PM
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check the belt, check for any boost leaks
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Old Sep 3, 2006 | 03:29 PM
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This is why I recommend using pulley size rather than psi production when discussing and ordering pulleys. https://www.s2ki.com/forums/index.ph...pic=380286&hl=
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Old Sep 3, 2006 | 05:29 PM
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Originally Posted by Slows2k,Sep 3 2006, 02:39 PM
Altitude and any cylinder head porting, CR change will effect the Max boost reading. Any other mods to the engine? What altitude do you live at? Is the belt tight?
yes i have full port and polished head and fully built bottom end 9:1 CR

i live in chicago

maybe i should check the belt
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Old Sep 3, 2006 | 05:31 PM
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Originally Posted by Sideways,Sep 3 2006, 03:29 PM
This is why I recommend using pulley size rather than psi production when discussing and ordering pulleys. https://www.s2ki.com/forums/index.ph...pic=380286&hl=
i'm sorry i forgot to mention my pulley size is 4.5"
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Old Sep 3, 2006 | 06:00 PM
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A ported head and lowered CR will cause a lower boost # than a stock CR and stock head.

Time for a smaller pulley to get more boost with your 9:1 motor.
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Old Sep 4, 2006 | 07:47 AM
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I'm running a 4.4in pulley and hit 10psi at 9000rpm:

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Old Sep 4, 2006 | 08:02 AM
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Basic question, what supercharger did you install?
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