I have been spending the last couple of days surfing through this forum to get a good picture of the stock blow off valve location. But haven't really come up with a 100% picture to verify myself. As I believe I am missing mine. Again, my car was a vandalized recovery by me, so quite a few parts were taken.

Am I correct in saying that the stock blow off valve would be located on the hose coming from the y-pipe. And from the blow off valve thats on the y-pipe hose another hose a smaller one (vaccum) would connect to one of the nipples on the IM manifold.

Which leads me to another question is their any aftermarket BOV that would fit exactly in the stock location? or would I most likely have to cap that hose off and mount the aftermarket BOV in another location. I have stock parts so mounting it on the plastic elbow or plastic intercooler piping would not be an option. I would like an aftermarket if its painless, but would go with a stock if the aftermarket is a headache.

And the third and final question is? Would I be hurting the car if I have it at idle for testing purposes, with no bov?

Again thanks in advanced for anyones help.

Lorenzo

 

I suppose the first paragraph looks silly, what I meant to say is it was a theft recovery, and then I purchased it from an auction.

 

On your intake box, there are two large lines going into the turbos, next to those are two smaller lines, these each have 'valves' inline that are visable. These are your BOV's, one is black and easy to see, the other is a little further back next to the UIM and is brown in color.

If I were at home I'd take a pic and post it.

~Kris

 

yeah that's what I was gonna say, I wanted to post picts but am at work, gettin paid to surf.

 

if you wanna go the cheaper route buy a stocker...no real performance benefit if your keeping the stock twins

 

there should be two notches where you can put piping over near the turbos on in front and one after the turbos. if you still have them they'll be the little brown thing that connect to that and the air box. dunno if you have the money get a aftermarket one prob wont help you greatly but it sound good to me and i have always liked hereing them when i shift

 

Well I don't think any blow off valve will be much of a performance benefit other than sound, looks, and how much pressure it can handle. So yeah I think I might go the the cheaper route and retain a stock one.

So am I right, is one of the bov on the line that runs from the Y pipe??? Basically that hose stretches about halfway to the airbox but nothing is on it just straight hose. Ill take picts like I was mentionin asap. Lot easier to describe with picts.

 

Sounds like the BOV is missing, but post a picture if you can when you get home.

The Apexi BOV Kit (make sure it's the kit) is a drop in replacement for the stock BOV.

Also, many people have noted that the stronger springed BOV's do add a little more responsiveness to the car. The spring can changed in the stock BOV as well.

 

yeah.i would show you a pic to my self but my cars still in the shop bov are good for turbo lag tt doesnt have to much anyways so it all if u like big sound coming form your car
yeah like mahjik said if you tighten or replace the spring will dertemen how much boost your car will hold or dump

 

Any "kit" that you get that's designed for the FD, is going to have the adaptor plates for a stock replacement... but if you're just buying the BOV, no you'll have to remove, plug hole, weld a flange, and install the new one... If you're planning on keeping the IC Stock, buy the kit.. If not, try and get a used one, and wait 'till you do the IC...

 

Sorry the image quality isnt better but this is all I had to work with at the moment...



You can see both inline BOV's;
The top line has a brown BOV a ways back, near the UIM.
The lower line however has a black BOV only inches from the intake box.

I hope this helps. People say you can unplug these from the airbox and block off the holes on the airbox, this will make the BOV's louder than they are currently.... that is if you are looking for more sound from them.
~Kris

 

Just to make sure everyone is on the same page:

One of them is the CRV (Charge Relief Valve) and the other is the ABV (Air Bypass Valve) which is referred to as the BOV. They have the names written on them as well.

While they look the same, they don't not have the exact same operating parameters or the same function.

 

Mahjik, I was unaware of this, although that explains the color differance. What do they do differant from eachother?

I just assumed that one came off each turbo. The black one near the airbox is the 'BOV' correct?

~Kris

 

aftermarket in the stock bov spot

 

Yes, the one closest to the airbox is the BOV (ABV).

The CRV is there to vent the excess boost during pre-spooling of the seconardy turbo (so you don't overwork/overspool the second turbo when it's not being used but spooled).

The CRV is venting until around 4000 RPMs, and then it closes.

While people do disconnect the BOV from the airbox to here it sound off when it blows, disconnecting the CRV is damn annoying and I don't recommend doing so (since it's hissinig at the low RPMs).

 

LOL Okay, thats pretty funny.

What would happen if you were to bypass the CRV? Would it possibly reduce secondary spool time? I'm thinking not likely since the buttlerfly is closed under 4000-4500rpm. (correct?) The greater possibility would be overspool damage to turbine?

I have so much to learn about the sequential system... lol

~Kris

 

It would most likely make the transition worse as well as causing damage to the turbo since you would be basically spooling into a brick wall (the CCV) until 4500 RPMs.

Here is a good overview of the sequential system:

http://www.autosportracetech.com/RX-...erOverview.htm

 

Thanks again guys for your time and efforts. So I guess I am missing the bov valve then. I know for sure I have the CRV valve as I had clearly seen its labeling, and then ABV also, because I believe it is the one which is located right next the the CRV, directly burried under the IM. Do you guys think I might have hurt the car any by letting it idle without the bov?

Mahjik without the labeling it would be very tricky to differentiate the valves, thank god mazda did something right and labeled them. Although I can't give them credit for cutten corners with all the plastic junk in there. Maybe the plastic parts dissapate heat better.

Damn and I thought I was almost finished, now I gots to look for bov. I'll take pictures tonight just to make sure.

Lorenzo

 

NICE pict XS what kind of BOV is that.

 

This is non-seq but still gives some good shots.

 

So I can purty much disregard the 2nd turbo wastegate If I have the sequential setup, correct? Awesome pict. Fatman0203 that helps out a ton.

 

its the TurboXS RFL... http://www.turboxs.com/BOV%20Type%20H-RFL.htm

to put it in the stock location like mine you would need the h-supra adapter kit.

 

Just idling? Shouldn't be a problem aside from maybe giving you an off vacuum reading.

 

Didnt mean to put 2nd turbo's wastegate, I mean to say 2nd turbo's BOV.

 

my bov setup is the same exact one as posted by xstransam..thanks to him i have it..