What would cause my blower to make 10psi no matter how much overdrive?

Jeremy_K

Registered User
I have my stock early model blower which is mildly ported with the sound ports shut. I used to have a 12% aluminum pulley on it and it would make 12 or so psi. I found out that pulley was slipping pretty bad so I upgraded my tensioner springs and went with the SCP aluminum 5% on the J/S and the blower (10%). Now I can't make more than 10psi. I tried the stock SC pulley with the 5% J/S and made the same exact boost. My times at the track have been nearly identical with all of these combinations. What gives? I'm at about 5300' altitude but I don't know if that's too much of a factor. 10 is the max no matter what.
 
yeah bypass hose check bypass to be sure it closes,

check all connections upper lower ic joints
is top coller nut tight?

is vac boost line cracked?
 
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