title explains it all. I know vendors will try to sell you on anything, but is the stock BOV really too small when running 15# I have stock twins with stock sequential setup.

I just ordered another batch of goodies from Jason and other vendors, can't wait to get all the **** put together. Trying to make sure I have everything I need.

 

from my understanding of bov's, they're supposed to lengthen the life of the turbo's, but I'm not too sure how well the stock relief valves work versus aftermarket ones.

I guess if you want the turbo's to last longer, then get the bov. Either way, it wouldn't hurt

 

 

Some one told me this, so I am relaying the info.
The BOV's sole function is to prevent the boost pressure from damaging the turbos when u transition from full boost to vac. The stock BOV works quite well, functionally there is no need to change. It's mainly a cosmetic upgrade.

 

In my experience running 15#'s on stock twins. The stock BOV's work fine. I used to run a Greddy BOV, I sold it and switched back to the stock BOV. I could not tell the difference. Just my .02

 

The reasons they say it saves turbos is because it vents the boost when off gas. However, a larger BOV will vent it more quickly. For instance I would never run 25psi with stock BOV, but looks like you guys are saying is that 15psi is pokay. I guess I am just a littel worried that a 1" BOV taht was designed for 10psi will not be as effective as larger one. But what the hell, I will try it. worst thing that happends is my rtubos blow , which woudl give me a chance to get some new ones and port the engine. hehehe.

thanks guys, thos things are so expensive anyway.

 

I am running 15psi on the stock BOV also, and have been for some time now. Keep in mind that the guys at Mazda didn't design the BOV to JUST handle 10psi, but to handle much more. If you want to go with a larger stock style BOV, I believe that Bosch makes one for Saab 900 turbo that is the same syle, except larger. Many guys I know use these. Anyhow, give it a try. I think they are about $30-40 bucks.

 

for 25 PSI, im assuming you are talking about a single turboed FD. i have never seen a single turbo FD using the stock BOV...no matter what PSI. i dont think its possible either, but i might be wrong on that.

 

I was just using it as an extreme example saying that ther are limits to the stock BOV can vent quickly, and pressure it can hold. Maybe it is okay at 15# what about 16,17 18??

thanks guys

 

the stock BOV is fine for stock turbos. im pretty sure the BOV will out-boost the limit of the stock turbos anyways, so you have nothing to worry about.

 

Most singles come with a BOV in the kit don't they? The stock BOV on the FD works great on mine and it's actually pretty loud (for stock). A lot of people like the sound of a larger one but I asked Dave at KDR the same question and he said they are basically cosmetic and that the stock one works fine even at higher boost.

 

everyone ive ever talked to or asked about this (and i wouldnt give you advice from an unreputable source) has told me the stock bov is good for about 17 psi and then itll probably blow out due to not being able to hold the boost pressure back no matter how hard that vacuum is suckin it back.

however...one of my friends says that he raced his friend in a trans am a few times and he could always pull him, but after installing an apexi bov (i would recommend a different one) that he pulled him a little bit more.

i guess know that itll probably last up, but for longevity or when that time comes that you want to turn it up some more youll be able to if you have an aftermarket peice. i mean....it wouldnt hurt right??

 

The reason upgraded bov's are required on most cars running higher than stock boost is that stock ones usually cannot hold high levels of boost. The reason the guy was able to pull harder on the trans am after upgrading his bov is because he was pushing the limits of what the stock one could handle and his boost was leaking off at the top end. This is a very common problem for even stock turbo eclipses. THeir stock bov can only handle about 9psi but they run something like10-12psi stock. They will git up to full boost, but by redline they will have gone back to 9psi because the bov partially opens up and leaks off boost. I don't know what point the fd starts to leak boost, but if it were me I would upgrade to assure that I stayed at full boost. You also get that cool ricy pppffffffttt sound when you shift!