Powerdyne/Bosch BOV help

[Ironman24]

So I finally got around to installing my BOV (or by-pass valve as Powerdyne calls it)

I plumbed it between the blower and the TB but left the other end open.

With the vaccuum line hooked up the valve is constantly open, you can feel the air out the tube. Well this causes the car to idle all over the place and it won't run worth a darn. Acts like a vaccuum leak. If I unplug the vaccuum line going to the BOV it won't flow any air but also doesn't open up under boost.

I called Powerdyne and they said the other end has to be plumed back into the intake before the blower to work correctly. Is this correct? I wanted to see if anyone has this thing working correctly with it blowing out in the atmosphere before I go making a hole in my intake lid.

Any ideas?

Thanks!

[Formulao96]

You can leave it venting into the atmosphere, just make sure that the vacuum line going the BOV is coming from the intake manifold somewhere. If you have a boost gauge, then you can put a T fitting on that line and run that to the BOV. The BOV is suppose to open when the boost turns back to vacuum, like when you are shifting(stepping on the clutch. I know that is how it works with a turbo, if it is different for a supercharger, then disregaurd my post.

[Josh R.]

<blockquote>quote:</font><hr>Originally posted by Ironman24:
With the vaccuum line hooked up the valve is constantly open, you can feel the air out the tube. Well this causes the car to idle all over the place and it won't run worth a darn. Acts like a vaccuum leak. If I unplug the vaccuum line going to the BOV it won't flow any air but also doesn't open up under boost.
<hr></blockquote>

You have a Bosch CBV(compressor bypass valve), and not a BOV. Most Bosch CBVs are open under all vacuum conditions. Meaning that even when idling the CBV is open. I think what you want is an atmospheric BOV and not a recirculating CBV. An atmospheric BOV opens with vacuum, but only while boost is present in the attached plumbing.

Now, I am unsure of the idiosyncrasies with the system you are running, but unless you need to recirculate the air, I would run a BOV.

[ December 03, 2002: Message edited by: Josh R. ]</p>

[Ironman24]

Josh, thanks for the reply. Since I've already spent the money on the Bosch CBV I'd just assume to use it as long as it will get the job done. I don't mind plumbing it back into my intake as long as it works. Basicly I just want something to take the pressure off the blower between gears when the throttle blade closes for an instant. Doesn't matter to me if the air is wooshed into the atmosphere or back into the intake.

[lord_gufi]

the piece you have should is better than a bov, if im right it is just a recirculation valve correct?, well that is Much better than a BOV because the air is put back and the super wouldnt have to re filter air it would aready be there ready to be compressed again this is what is on the Nissan 300 zx's ( z32's ) and they are infact better for turbos at least because the air is there already again and the turbo doesnt have to slow down as much because the air isnt trying to decompress

[Tiago]

mine is open, and it does not leak at idle

[xjarayax]

Same piece I have sitting here for my project.

[Mighty Thor]

Hey Michael, let us know how you did it. I just got one from e-bay for 25 bucks. It came from a Saab car (Bosch) and I don't know if its the same as yours. Thanks

[xjarayax]

It's most likely the same one, all the one's I've seen on eBay are the same ones he's talking about.

[Kelly Rosato]

<blockquote>quote:</font><hr>Originally posted by xjarayax:
It's most likely the same one, all the one's I've seen on eBay are the same ones he's talking about.<hr></blockquote>

Anyone got a pic of one of these Saab BOV thingies?

[Mighty Thor]

<blockquote>quote:</font><hr>Originally posted by Kelly Rosato:


Anyone got a pic of one of these Saab BOV thingies?<hr></blockquote>

http://cgi.ebay.com/ebaymotors/ws/eB...tem=1876441108

[Blazzin Joe]

<blockquote>quote:</font><hr>Originally posted by Ironman24:
Josh, thanks for the reply. Since I've already spent the money on the Bosch CBV I'd just assume to use it as long as it will get the job done. I don't mind plumbing it back into my intake as long as it works. Basicly I just want something to take the pressure off the blower between gears when the throttle blade closes for an instant. Doesn't matter to me if the air is wooshed into the atmosphere or back into the intake.<hr></blockquote>

Make any progress on this? Wanted to know what your outcome was :D

[Ironman24]

Well I had a thought the other day. Nitrous backfire. I've already had one and it was a huge fireball, toasted part of my induction and a few sensors/injectors. (this was before the blower install) So I got to thinking if I have another backfire with the Bosch unit on there it will just recirculate the fireball, which I don't really want to do.

So instead of plumbing this Bosch unit back into the intake I've decided to go with an actual BOV valve, maybe an adjustable one since I'm going to swap to the 9lb pulley soon.

Anyone want to buy this Bosch unit?

[Blazzin Joe]

<blockquote>quote:</font><hr>Originally posted by Ironman24:
Well I had a thought the other day. Nitrous backfire. I've already had one and it was a huge fireball, toasted part of my induction and a few sensors/injectors. (this was before the blower install) So I got to thinking if I have another backfire with the Bosch unit on there it will just recirculate the fireball, which I don't really want to do.

So instead of plumbing this Bosch unit back into the intake I've decided to go with an actual BOV valve, maybe an adjustable one since I'm going to swap to the 9lb pulley soon.

Anyone want to buy this Bosch unit?<hr></blockquote>

Have you some ideas about stopping the slippage w/ the 9lb pulley? I had some ideas that i shared with slacker69, he seemed to think what i had going would work really well.. drop me an email to mymilkexpired@hotmail.com . I would be interested in your ideas on my "plans" and anything you have come up with [img]smile.gif[/img]