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.