I am having a little trouble holding boost at high RPM. I have my greddy profec B spec II set to hold boost at 10-11 psi and it will get to that and then begin to slowly lower to 9-10 psi. i tried adjusting the bov, but that didnt help b/c if i made it too hard i still couldnt hold boost and the turbo made that fluttering noise b/c the BOV was too hard. could my exhaust piping be too small? would that cause me to not be able to hold boost? i have 2.25" piping for the greddy evo 2 exhaust. anyone know what the problem could be? thanks.

 

what is your setup?

 

custom turbo kit on my 7thgen

t3 super 60
custom IC piping
custom manifold
tial 38mm wastegate
greddy type rs bov
greddy profec b spec II
greddy e-manage
rsx-s injectors
johnny race car FMIC

 

I vote for this solution:

http://www.importparts.com/sho...d1abe

get the .7 or .8 bar spring.

electronic boost controllers seldom can maintain boost within 1psi of the target, unless you are running really close to the WG spring rating.

Upping boost w/ a wastegate spring is guaranteed to work 100% solid, as long as your exhaust piping/manifold design is correct.

 

.7 and .8 bar = how much psi?

i have a 6psi spring in there now

 

Spring/Bar x 14.7

.7 x 14.7 = 10.29psi

.8 x 14.7 = 11.76psi