Type S BOV going bad?

[LwlrMk]

Ok, here we go. I'll start off with what I have,
99 GSX (auto) w/
-Greddy FMIC
-Type S BOV
-Profec B
-16G Exhaust Mani. (the DSMparts one) old one cracked
-K&N FIPK
-Guages obviously
-62 MM BBK Throttle body w/ gasket matched intake manifold.

Problem is that my boost leaks when i'm at WOT. Set at 16 leaks to 12psi. ONLY AT WOT. It DOES hold boost at 16psi under any other throttle position.

I did a leak test and found stock Throttle Body was leaking out of the shaft, so I just upgraded. No leaks when tested. vaccum readings are normal.
BOV is kinda old, got it used from a friend, could the spring just be worn? It's almost all the way to hard, about 2 threads only showing and it still flutters under low boost and a good whoosh under high,

thnx

 

[igs]

stock turbo does not make 16 psi at all revs

 

[Amar1995]

If you are pressure testing the system then you will find your leak. Peroid. Have a frien watch you boost guage as you pressure it. If it is your BOV then you will see it leak when you pressure it to 16PSI. I am assuming that you still have the T-25?? If so then that is why. Your turbo is running out of breath as the engine revs. Hope that helps.
Good Luck

 

[RuBiCaNT5X]

I am guessing it's just the T25 falling down... Does it happen around 5200 - 5500 and up in the rpm range?

 

[LwlrMk]

yeah it does fall around then, stock turbo and all.

 

[LwlrMk]

I feel like a moron, didn't know that stock t25's did that...guess 20g is comming sooner, although. anyone hear about garret's potatoe turbo?