I see people say this all the time - that their stock bov was leaking, but I have no idea how they know this when they're completely stock. The stock BOV works fine, and it doesn't just start leaking randomly. I have seen one case where one fell apart, but that's an exceptional case.

I don't know why you still think it's not "getting to the atmosphere port." It only does that at full boost, you are still running stock boost, your boost tapers all the way to 16psi by 6500rpm, you have a stock intake, and the APS isn't very noisy to begin with. So, why do you still think it's not working?

 

haha...thats my girl.

Mods are I/TBE/MBC/Dynoflash mail-in tune.

 

alright, i will give you the less objective response...i have the aps on my 06 ... yes i had the titanium or aluminum or steel or non-plastic valve stock with my car, but i wanted the vta sound also without losing performance... so i went with aps... it didnt vta at first unless i was at full boost, i backed it out, tested, a little better, backed it out tested, too close, so now its setup to where if i hit in between 13 to 15 psi boost it vents, if i hit 20 it vents louder... there have been no noticeable power losses, nor do i get the flutter or horse sound as you guys put it. people on this forum hate vta bov's because they think its ricey... its your opinion and whatever you like is what you should go with... you will find about a 70 20 mix on here of people who dont like it to people who do with the other 10 percent following what there favorite poster says and only mod they have to their own car is the carbon fiber fuse box cover.... if you need any other info, just pm me

 

you are very experienced in the evo community or you talk a good game, whatever the case is, you havent seen everything. i could tell my plastic bov was leaking on my 8 when i had it because after i installed a mbc, it wouldnt hold the boost, it peaked at what i wanted and tapered a few lbs down...i replaced the bov with the "ricey" ssqv and what do you know, no more taper, it was amazing. while i support your theory that if you are stock replacing it isnt necessary unless you just want to make a noise, it doesnt mean it cant leak

 

That's the problem right there. The stock turbo always tapers, and it wasn't the stock BOV that was causing your taper. People always complain that the stocker is leaking when they see taper, but the taper is caused more by the turbo itself and the MBC. I see taper with all 3 BOVs I've used. It's a natural occurrence.

That being said, we know the stocker is weak, but just outright claiming "it was leaking" when the guy has a stock Evo just doesn't hold water. He doesn't know if it was leaking. He just thought it was for a reason that he has not divulged and is using that statement as a justification for purchasing a $200+ BOV that is partially VTA.

As a reminder, I ran 12.22@111 on just a 1.75 60' while still using the stock BOV and only having a cat-back. I was pushing 22-23psi on 104 unleaded, but wasn't held back by the stocker much at all as you can see. I have since completed my exhaust with a downpipe/testpipe, upgraded the BOV, added a stronger clutch, raised the boost to 24-25psi on leaded race gas, and improved my launches, but have only improved by .2s and 2mph. I would venture to guess that the stock BOV wasn't a major weak point. 99% of people who are stock have no leg to stand on when saying theirs leaks.

 

always great info with this man ^^, as for the person with the horse under their hood i think you may have it backwards and are you sure you didnt mes with the screw

 

Just FYI, It wasn't installed backwards. I bought the valve used so possibly the previous owner messed with the setting. I backed it out more and it seems to be fine now. It isn't making the same noise. Thanks for everybody's help. problem solved.

 

im happy its solved good job what was the problem

 

Well first, I'm not stock, I have a turbo back and a K&N drop in. I knew it was leaking from both the gage and from when I put my friends SSQV on for a sec to see if it fixed it, and it did.

The reason I don't think that it's working is that it vented all the way once and has not done it since.

 

If you have a cold air intake you will hear the compressor surge which sounds like a horse. I have an HKS bov which vta and never had any troubles with Idle quality. I have had it for about 3000 miles now. I then got my cold air intake and thats when I heard the horse sound you are talking about.

 

When I run 19-20 psi mine only opens enough to recirculate. It's nice this way cuz I don't like buzzing aroud town in stop and go traffic listening to the pssss all day. But when letting off at 26 psi it sounds totally different. I wish there was a way to totally muffle the sound, but at high boost with an intake I don't think it's possible.