not holding boost

[stokeless]

i can't get no more than 11-12 psi. i switched all the vacum lines, checked for leaks and still don't know why.

main mods:

255 walbro
lex afm
hardpipes
TC59 turbo (bolt-on) w/ internal gate
hks afr
hks evc I (with the BC off, i get 4-5 psi)
3in full exhaust from elbow back
AFPR set at 45psi without vacum

it would hit 14-15psi and drop back to 10-11psi

what can i do to hold boost

 

[robbo185]

i bet you have a small boost leak somewhere due to the fact that you only boost 4-5 psi with it bc off and with your mods it should be higher

 

[jdub]

Your wastegate actuator could be going on ya...test it for diaphragm leaks and spring tension. Same for the EVC boost solenoid...if it's not holding good pressure, psi will creep back. Could be the solenoid itself or the pressure lines going to it from the turbo.

 

[ViR2]

What tipe of BOV do u have? Stock BOV may be leaking at this boost level

 

[stokeless]

greddy type S

 

[Wills7MGTE]

Greddy BOV used to be notorious about leaking, I like my hks myself

 

[89supturbo]

could it be fuel cut which may have gone up do to the lexus afm but would not have been eliminated

 

[stokeless]

no fuel cut!!

 

[MDCmotorsports]

Sounds to me like a wastegate or wastegate controller problem.