$0.16 BOV mod on NASIOC
 

I have had a hard time finding any helpful threads on this forum about this mod. I read through most of the pages of this thread on NASIOC:
http://forums.nasioc.com/forums/showthread.php?t=454965

I am just curious to see how many of us have tried this w/ success on the stock BPV. My tuner has told me that due to the elevation in SLC stock BPV only holds about 15-16 lbs of boost. Just wanting to hear opinions on this and more people that have had experience with this on an LGT.

Thanks!

Stock plastic BPV's suck no matter the elevation. Buy a forge /thread

^ :cool: ^

So you take advice from a forum dedicated to a different car and more importantly a different engine (2.0) and different parts (BOV) and expect to achieve safe results? Go ahead. The thread you referenced is 10 years old...

This mod applies to any bpv of recirculating design that has a lower boost reference hole in addition to the boost/vac hose on top. That means it will work on the lgt.
There's even a company that does this in Japan and sells the modified valves at ripoff prices: http://www.coto-sports.com.

Anyway, I did this a couple of years ago, both on my oem bpv, and my dsm 1g bpv (metal!) that I modded to fit the lgt flange.
You'll likely see some mild compressor surge on moderate throttle shifts which isn't harmful, but it won't do a damn thing performance wise.
Theoretically your bpv will close faster on boost and keep it shut even at higher boost levels with the mod, but higher boost levels seem to play nice with the lgt bov.
In summary, not worth the time or effort unless you're bored and have nothing to do.

I did this on my 05 LGT. I had to retune slightly after the AVO380 because it was apparently leaking pre-mod. I credit its modified capacity to my 5EAT LGT's power through the gears

I did this on my 11 WRX. Why not, it provides every positive attribute of a Forge, but for virtually free. Plus, it has the reliability of an OEM part. This one was plastic like the LGT's BPV. The addition to the WRX's driving performance was immediately obvious.

I did this to my 11 STi. Better, all metal construction, but basically the same BPV. Better, bigger, vent orifice... for the bigger TMIC, I guess. Same process to modify. Same welcomed addition to driving/power performance. Even gave it a twist of my own.

Anyone who has read the complete mod thread "over there" will come across my posts. I've been vocal about the virtues of this mod for years on here as well as other forums. It provides virtually the same BPV as was OEM on JDM STi at one time, at FAR less cost than importing one. Lots of years, three different turboed Subarus, all without an issue, all while addressing once and for all every issue related to a BPV/BOV.

Thanks Technicalgarage. So, you're saying this wont allow my BPV to hold more boost?

SeeeeYa, I will read through the thread again. I figure why not give it a try if its not going to hurt anything and it holds more boost, saves me the money over getting a Forge.

If your BOV is leaking, it's broken or you've got it hooked up wrong.

BOV's not being able to hold boost above xx is complete BS. By design, they don't care what the boost pressure is. They always have the same spring pressure holding it closed.

Hmmmm. Interesting.