what makes a bov unresponsive

[Pappu1]

came accross a wierd issue on my mates rex

basically the bov used to open up and psssshh anywhere after the 2psi mark on his gauge

now seems to only blow after 5psi

he showed to me and all plumbed ok

im not sure what to tell him abt why it wud open later all of a sudden

oh the only differencethey did a boost tap install the night before (which i also checked and is plumbed ok with no leaks)

[Kiwi_Fozze]

Spring normally needs adjusting after a couple of months use?

[Pappu1]

It\'s a turbosmart one Abt few months old

Change in sound happened in a few hours between turning car off and I stalling tap and going for a test drive

Wierd

[reaperblitz]

Is it one of those vports? Wind it in to compress the spring? Or make sure there is no vacuum leaks.

[Pappu1]

It\'s the super blaster or something lol

Yea was Gona do the spring thing tonight but just surprised on how all of a sudden it\'s gotten quiet by itself

[Pappu1]

Lossened the spring adjuster and still works as if it\'s a tight springed bov

[ADIKT]

 SP00N said:

Lossened the spring adjuster and still works as if it\'s a tight springed bov

replace it

[Marky]

Give it a lube up - just biff some CRC in there and pump it a bit

(hurr hurr)

Seriously just give it a whirl, they get pretty grimy in there over time and does no harm, if the brass can slide easier then it\'ll make it more responsive for sure

[Guest]

I used syn lube on mine works way better before it sorta shuddered closed.

[Pappu1]

wont using crc on the brass make it worse (workmate tells me that crc does not lube between brass and almunium apperently - unsure what to make of his knowledge on the matter?)

[Marky]

nooooo idea but worked for me

use silicon lubricant instead maybe

[Pappu1]

 DNA said:

Tried another bov on it ?

Ive had this happen to my old wrx mate

It was\'nt the bov either, took my car to a mechanic and he done something to the vacumn lines or something but he fixed an air leak iirc and it worked again but this was ages ago

I knew it was not the bov on my car because we tried a few bov\'s all of them did not make a noise so we were certain it was something else

oh tru...he did install a tap so maybe fkd something else

hmm i will remove tap and then see if any difference

[reaperblitz]

Lol ^ I hope he isn\'t running the boost tap on the same line as the bov.

Also if its the type with a spring and ball bit that fits between waste gate and turbo, it can be plumbed incorrectly and it will bleed air back in and bovs can hesitate.

To lube brass bovs, simple tear down, clean and oil can sort it. (Clean car oil any grade) if ya dont believe - check the manual that\'s what it says to do.

[Guest]

 reaperblitz said:

Lol ^ I hope he isn\'t running the boost tap on the same line as the bov.

Also if its the type with a spring and ball bit that fits between waste gate and turbo, it can be plumbed incorrectly and it will bleed air back in and bovs can hesitate.

To lube brass bovs, simple tear down, clean and oil can sort it. (Clean car oil any grade) if ya dont believe - check the manual that\'s what it says to do.

Thats what steve said also.

[Pappu1]

Ok cleaned the bov and put a very light flim o oil on the piston. Put it back together

Will update how that goes when find out from him