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Originally Posted by SVENSONJR
its pretty big ill measure it for sure...it was from rpm outlet. now i have stock throttle body and intake so maybe im hold ing it back.
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Don't make any differnence on the guage really ,I doubt you'd see a pound difference
stock airbox, stock TB, stock plenum, Dirty intercooler 4psi pulley made 13.5-14 psi even with a vaccuum leak
AEM Brute force,ported TB, and clean intercooler 4psi pulley made 13.5-14psi on same guage.
Biggest diference was when I adjusted the boost actuator, even on stock pulley I noticed a diff. on the guage probably due to the butterfly seating better and sealing up the leak by.
I think the reason that when people install all that stuff they see a boost diff. is because they adjust the actuator when they install a plenum or blower. I may be wrong, but all that stuff including a SC port just adds flow and efficiency not pressure.(those two things do add HP though)
Also I have added a 2.75 upper pulley to my 5lb lower pulley, before upper I would see 8 psi and then it would climb to 14.5-15 psi on the same guage. After the upper I see an instant 10 psi then it climbs to 16.5-17 psi. I only see this in a 3rd gear pull. On 1st and 2nd i see it max at 14psi before shift change.