Hey,
Just uploaded a pic of this aftermarket BOV that's attached to the stock BOV on my car. Check it out, do you think it would actually increase the function of the stock BOV or would it just be to increase the bov noise?
http://members.optusnet.com.au/danie...V/DSCF0026.JPG

It's a little blurry but hopefully clear enough to tell what it is. It says KSP on the red cap. Anyone seen these attachments to the stock BOV's before?

Dan.

 

What kind is it??? is it louder than the stock one even though its not vented?? sorry for the ?'s im lookin at gettin one too.

 

By the looks of that pic someone has open air vented the stock bov and thats probably just a filter of some kind on there. There should be a plug in the tid which the stock bov used to plumb into. It will not increase the function of the stock bov but it should make it louder.

 

Two bovs? Wouldn't that react kinda slow? Would it flow enough? doesn't sound like a good idea to me...

 

Alright cool. Well i've only had limited experience with rx7 series 5 turbos, so i'm not sure of how loud they are stock, the only other fc turbo i've seen had an aftermarket bov too, so i can't say, but it is pretty loud, and very noticeable, i would imagine a fair bit louder than stock. So it's just plugged in to where the stock BOV would normally plumb back to the exhaust?

 

The stock bov is plumbed back into the turbo inlet duct. If you have a look just below where the red thing on the end of the bov is you should see a hole with a plug in it. Thats where its meant to go.

 

ah ok cool thanks.

 

all it is is a fancy check valve that is actually vent a by pass valve to the atmosphere it the exspensive version of the home depot open air by pass vlave

 

I don't see a vacuum port on the second one....I doubt if it is a true bov.

 

That's just a check valve, not another BOV. You should remove it and plumb the BOV back into the intake. Putting a restrictive check valve only limits it's flow.

 

err ok, so what does a check valve do then?

 

Your stock BOV vents back into the intake, right after the AFM takes it's reading. The idea behind this is that the AFM has already metered that air, and if it were spit out into atmosphere, you'd lose some of that metered air, and run rich for a second...something the factory didnt want (flames and backfiring, and emissions). Now...the stock BOV is also partially open, even under vacuum. Since it is normally plumbed into the intake tract, this doesnt matter.

Now, some people come along and decide they want the loud "whoosh" of an open air vented BOV. The stocker makes this sound too, it is just muffled by the stock intake. Vent it to atmosphere and it gets louder. BUt, even though you plugged the hole in the intake, the BOV itself is now a vacuum leak, and the car runs shitty. How to get around this? Put a check valve on it...let air out, but not in. That is what has been done here.

The right kind of check valve is not restrictive and doesnt prevent the BOV's operation, while still preventing a leak. Some valves are restrictive, and can cause compressor surge.

 

Hmm interesting, so this could even be a possible vacuum leak, which could be possibly causing my roaming idle... Thanks for that, i think it's doubtful that this check valve is the cause, but i'll keep it in mind anyways, it doesn't seem stuck open or anything while idling, the little ksp thing spins when it blows off, only for a second, it spins and vibrates, pretty cool :P Probably screwing up my idle, but cool none-the-less.

 

A check valve is there to PREVENT a leak, not cause one. However, if it is screwed up, or not done properly, it can leak. Plumb the bov back into the intake and see what happens.

 

Yeh i will do that, eventually, when i'm about to take it to the dyno, just waiting on compliance first. I finally got a reply from the ats-bm company that had a big sticker on the rear wing. This is what they said, it's kinda funny but yeh interesting, i think my car may have been sitting for a long long time in Japan.


Hello,
the information on ATS-BM is offered. The company of the origin of KENSTYLE(s), we who are BODY KIT makers, is ATS-BM.
ATS-BM was dealing with tuning of FC3, S13, and R32 grade ten years ago.
It had many users with the time and skill special as a tuner of a rotary engine.
The engineer is dealing with FD3S or various cars by brand called Present AXIA SPORTS.
The engineer is the gentleman who left results very excellent also as a racer, and a name is Fukusima Toshihiro. The custom-made shop which he manages is located in Tokyo. Correspondence of English has not been carried out although it has a website.
He will reply to the question for which you ask about tuning. However, in the environment which he has, it may be difficulty.
An engineer like Mr Fukusima does not exist in present ATS-BM.
Although it can talk with him, in order to acquire your required information, it is difficult for us to intercede. (Technical explanation is difficult) I can transmit this mail to him. An answer may be impossible. I'm sorry.

http: //www.axia-sports.com /

this is the WEB sites of AXIA.

And that's it... hehe. I'm trying to get in touch with panspeed, and hopefully Mr. Fukuyama responds, and maybe even remembers the car.

Dan.

 

All check valves are restrictive, otherwise they wouldn't work. Most people doing this mod go to a hardware or plumbing store and come away with a check valve designed speicically for low-flow, high-pressure plumbing environments instread of the high-flow, low-pressure turbo plumbing environment. Bad idea.

Why puy any restiction into the BOV's path when you can do this instead?