Nolimits31

I am supposed to have the 10psi pulley from kenne bell but at wot i see 13psi. this has been since i installed it last year but since i recently had it tuned my tuner suggested to pulley down. im not complaining by any means but just curious what would be the cause of higher psi on a 10psi pulley, and yes i measured it to make sure it is a 10psi. so if i actually put the 14psi pulley on their i could see 17psi?

2000AZ5.0GT

Boost is a byproduct of airway constriction. If your intake system and such isn't perfectly efficient, you will have more pressure, ie more boost.

This is why when you have added full exhaust, cams, heads, intake, boost pressure will go down while keeping everything else the same

Nolimits31

ok my setup is o/r x and flowmaster catback, BBK 75mm TB and BBK CAI.

Black_GT_02

How much will boost go down if the OP added long tubes?

MAD SVT

how does it measure 10psi????????

i order my pulleys by inches... i had a 4", now i have a 3.75" they dont tell me boost measurements.

Nolimits31

ok well it is a 3-1/8 inch pulley which is 10psi.

MAD SVT

for theyre test car maybe, but obviously not YOURs... if you want lower boost, maybe get a 3 3/8 to 3 1/2"

Nolimits31

Their test car was a 02 gt, thats what the tuner recommended cause of the crappy bottom end but i think 10psi is just fine, but i am gaining 3psi more for some reason.

MAD SVT

do you WANT 10psi???? the easiest way to get it is to swap pulleys to a larger pulley, of you want to drop the boost in a different way... Port your heads, install some cams, headers etc. it'll drop it to 10psi... actually give you some more power too

all that? 4k
new pulley? $80

Nolimits31

yea someone else told me the same thing but i am not going to drop another 4k-5k into this car i need to start modding my new gt500. 13psi is fine to me i dont mind it at but it makes sense now why i see that much. thanks for the input.