Wat BOV wll hold 18psi - 20psi

[Waldo]

hey guys this has probably been drilled to death this topic, just want to know if anyone knew what bov will easily hold 18 - 20psi without leaking, and is preferablly plumb back, is the greddy type s any good cos to me it just looks like the stock one, what about the hks ssqv? the car is going to be a drift car soon, is it necessary to put a bov on? will pluging the hole up do any harm to the turbo or the engine?

regards luke

[R31Nismoid]

GTR BOV's

the only way to go

[Cubes]

GTR Bov's differ to that of the std RB20/25DET bov?

Theoretically the stock single turbo bov's should hold well as they have a boost feed that applies pressure on the opposite side of the diaphram to hold it shut.

[R31Nismoid]

yeah, they are better

im only using one of the pair, as i never had one anyway before it was installed.

fine on my car

[Waldo]

are they the same bolt pattern so they are a bolt-on part, so they have a much stronger spring do they, how much boost are you running around yours

[Waldo]

ok cubes, so your saying with running more boost it should still hold the bov shut the same as running 2psi, because it has a pressure on the back of the valve holding it shut, and this pressure is determined by how much boost you are running? is this right

[Cubes]

Yer theoretically, what holds the bov shut is the stock spring tension + the boost from the plenum.

In practice it may not always hold true.

[R31Nismoid]

even if they dont bolt up, just weld it on... thats what we did

But try the stocker 33-t one and see what happens IMO

[Waldo]

just finished gettin my dyno result with the stock bov, and the guy said that it opens up as soon as it goes over 12psi, i wanted to run 18psi so i guess i have to whack on a new bov

[wolverine]

the factory BOV should hold 42psi for all the reasons cubes posted.

i'm sure that if you do a search (thru 4000 pages) that rev210 posted this fact?!?!

[TTT]

the only time the factory bov MIGHT have a problem is being able to "VENT".

say you have are making a shit load of power using a large turbo which is gulping in masses of air... then during gearchanges, the sotck bov might not be able to "VENT" enough air and you will have reversion.

but the bov doesn't leak or open.

as stated above... it has a spring pressure, PLUS, even boost pressure on both sides of the diaphram.

[krzysiu]

I guess my stock bov is rooted then as it cant vent 15-16 Psi??

[Waldo]

well what can my problem be if its not the bov, when it was getting dynoed they could not hold 18psi at all it would spike there then drop to around 12psi, what could be causing this but a leak as they checked all the intercooler pipes for leaks and they said there was none, could my actuator be stuffed? i just blamed it on the stock bov because its the only part of the pipe work air can escape. my turbo is a highflowed job and should hold 18psi??