Is the stock BOV large enough to be used with a single turbo on a ported motor producing around 400rwhp at 15lbs of boost?

My gut feeling is YES...maybe, however this is assuming that the stock turbo system does not use the CRV as an additional BOV when the system is in secondary mode (does anybody know?). If the stock system does use the CRV then using just the BOV would effectively cut the flow capacity in half.

If the CRV is not used there are still two other potential reasons I see the stock BOV may not be adequate.
First, my car has a lot less back pressure than the stock car because of the ported motor and larger turbo. As a result it will move more air through the IC pipes at the same boost level.
Second, I will be running up to 17lbs of boost, approximately double what the stock system is designed for.

For anybody responding, please give me the reasoning and or experience that were used to form your opinion.

 

I ran the stockers at the power level your talking about but at higher pressure. I used both of them, just T'ed them into eachother and ran to manifold. It worked great till I got an exhaust manifold leak and it heated up the bov to much warping the internals and causing it to leak real bad. That in turn caused my turbo's to run WAY out of thier eff range.....my ait spiked to God knows what, and my engine poped

Moral of the story is they are fine when healty but it doesnt take much to make them not healty and at that point it can cause major problems.

Also, like in my story, dont think you'd notice it on the ait sensor cause the temps will go from mild to wild in about a milisecond when a turbo gets out of the eff range

Just so you know, my new engine has a Tial attached to it. I think the stockers are ok for a temp fix/crutch but I dont suggest them for long term use

my.02

STEPHEN

 

I already did every test possible on this
the crv takes a litte bit longer to close up than the bov so it will slightly hurt spool (very slightly that is....)

and heres my experience im not sure whats happening because I think the stock bov is fine but when I took off the intercooler pipe from the intercooler to elbow and reved the engine I didnt get any surge so I believe the bov wasnt adequate....but it was surging at 1psi even so Im confused I got a hks ssqv and if that doesnt solve it oh well sounds cool any way haha

https://www.rx7club.com/showthread.p...ighlight=surge

https://www.rx7club.com/showthread.p...ighlight=surge

 

Surge - Your still having bov problems? Your stockers are probably just defective and one of them isnt opening right. Where did you have your bov's located...were they before or after the intercooler?

What intercooler are you running? I wonder if you have a lot of pressure drop causing the hot side to have a lot more pressure build up than the cold side.....hence the bov's aren't venting anything eventhough your turbo is still seeing pressure

You could try to tap in some type of nipple and measure the boost before the IC and compare it to after the IC just to see if its a possiblity.

STEPHEN

 

SPO I was just giving him those threads to read through for info

I don't know if I still have that problem because I've had the car down for 6 months now...I got the hks ss bov and a new engine and intercooler piping setup along with one endtank changed and many other things. I can't imagine having the problem and if I do I don't care because everything is setup real well.

Yanni

 

we've put a couple fd bov's on other cars (323gtx and an 89t2) and they like to leak. also the fd valves dont seal until about 1psi (the one on the 323 took about 3, so basically it being an afm car didnt run until it hit 3 psi), unlike say an aftermarket one where they are sealed until higher vacuum