Gtr Bov

[cars_suck]

Hey guys, i bought a GTR BOV a while back and it seems that the spring was alot softer than the stock blow off valve... just wondering if this is normal??

i put it on my car and ofcourse it leaked.. but why ? i never thought springs could get that soft?

anyone know or have one that can explain this?

[R31Nismoid]

I don't remember mine being soft enough to press with relative ease to be honest.

Been 4 years now but i remember i couldnt press with my thumb, then i didnt try super hard but medium pressure didn't budge

Is the VAC line connected and not leaking?

[limpus]

Mine is soft and works fine....

[TTT]

are you trying to vent to atmo or plumb back?

[RPMGTR]

They are quite soft by design as they are intended to be used as plumbed-back.

On an engine with good vacuum, they will be open at idle and cruise.

cheers

[cars_suck]

ok sweet, because i can press it in easier than i can the stock gtst valve and i thought that was weired.. and it is open at idol but as long as your saying this is normal? and it will seal when there is boost and not leak?

and does this mean my engine has good vacume??

cheers guys, i know im a noob but i know bov's arent sposed to leak

[cars_suck]

I don't remember mine being soft enough to press with relative ease to be honest.

Been 4 years now but i remember i couldnt press with my thumb, then i didnt try super hard but medium pressure didn't budge

Is the VAC line connected and not leaking?

the VAC line is connected properly and not leaking.. but mine is soft enough to press in with relative ease.. easier than stock gtst valve anyway.

Mine is soft and works fine....

plumped back or not?

are you trying to vent to atmo or plumb back?

i dont have it plumped back at the moment.. should i plum it back??

They are quite soft by design as they are intended to be used as plumbed-back.

On an engine with good vacuum, they will be open at idle and cruise.

cheers

Does this mean i have to have it plumed back? or will it still work fine vented to atmo?

[limpus]

They are designed to be run plumb back and that is how i have mine hooked up...

[TTT]

Only way to run them venting to atmo is if you have acar with no AFM.

and even then, they will need some sort of one way valve/filter on the end of them.

so on your car, yes.

PLUMB BACK ONLY.

[cars_suck]

ok, so its ok that its open a little at idol as long as its plumped back..? it wont leak on boost??

[TTT]

even the stock gtst one is open at idle.

but as soon as you rev a little bit, the vacuum sucks it shut.

just try it plumbed back.

[cars_suck]

ok will do

i still dont quite understand however why it cant be run vented to atmo if it still leaks at idle when plumbed back anyway? no matter what your still loosing air..? as long as the valve is sealed when on boost why should it matter if its plumbed back or not?

confusing...

thanks anyways guys

[R31Nismoid]

You cant run the stockers ATMO due to the fact they leak idle and so on.

Causes idle issues and so on. Where ATMO BOV's are shut tight @ idle etc

[GeeTR]

Lightly leaking at idle doesn't affect the factory setup as its "leaking" back through the BOV return and being ingested after the AFM, before the turbo. As such, it doesnt get measure twice, nor get "lost" to atmo.

My old GTR BOV's are very soft. The design in principle is to soften or smoothen the boost / vacuum transition i would imagine.

Edited June 7, 2008 by GeeTR

[bnr#@]

I have two new gtr blow off valves sitting here and yes the springs are soft.

Now to find the return pipes.....

[cars_suck]

sweet.. i plumbed it back and it runs fine now.. still sounds tough too but not to loud

thanks for the info boys and girls