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Discussion Starter #1
I've seen a few people say that getting a BOV doesn't really do anything but make noise. I could care less about the sound, but what causes the leaking? At a certain pressure it must start to lose pressure? Is it the boost controller or in the tune itself? Admittedly I am no expert when it comes to the mechanics... and have ZERO experience with the Subaru. I know the Evo's bov would start to lose pressure for some guys in the low 20 PSI range. A lot of people just crushed their BOV and that helped them to not need to buy an aftermarket BOV.

Anyway... what's needed here?
 

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Put simply, it leaks, because there is a leak. Somewhere there is a seal that is not holding air. I don't really know how else to describe it. It's like if you have water in a Zip Lock bag, then you punch a hole in it. The water will "leak" out because there is a hole that is not effectively sealing the water in. It doesn't have to do with the boost controller or the tune, air is physically leaking out of the system.
 

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Discussion Starter #3
Put simply, it leaks, because there is a leak. Somewhere there is a seal that is not holding air. I don't really know how else to describe it. It's like if you have water in a Zip Lock bag, then you punch a hole in it. The water will "leak" out because there is a hole that is not effectively sealing the water in.

Well yeah... I guess I was more wondering where the leak typically comes from on these cars. People say it's pointless to get a BOV which is fine with me because it's money saved and I don't think i'll be running that much boost even after a tune since i'll likely just go with a bigger TMIC and a downpipe... maybe a drop in filter? I don't know. I'd like to have around 300 whp and I think i'll be satisfied.
 

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In my experience most leaks occur either within aftermarket VTA BOVs (because the diaphragm is not designed in a way that properly holds pressure), at the seal where the BOV attaches to the system (due to improper installation or crappy gaskets), and/or at the joints in the intercooler piping.


I know with my FMIC, every time something is messed with I end up with multiple leaks where the pipes fit together. You really have to crank down the clamps on the silicon couplers to make sure they don't leak.
 

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Discussion Starter #5
In my experience most leaks occur either within aftermarket VTA BOVs (because the diaphragm is not designed in a way that properly holds pressure), at the seal where the BOV attaches to the system (due to improper installation or crappy gaskets), and/or at the joints in the intercooler piping.


I know with my FMIC, every time something is messed with I end up with multiple leaks where the pipes fit together. You really have to crank down the clamps on the silicon couplers to make sure they don't leak.

ohhhh yes I remember that. My Evo X used to run 29 psi of boost... stock turbo, etc and talk about ALWAYS checking for leaks. I was lucky though... they (multiple tuners) told me my car held higher boost better than most cars without having any sort of knock or any other issues.
 

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Generally the stock TMIC "Y' pipe gets brittle over time and tears. Or the clamps just need some adjsutement over time. Sometimes it just people not installing parts properly.
 
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