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N/A Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's specific to NATURALLY ASPIRATED NG900 and old 9-3.

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Old 02-01-2006, 11:02 AM   #1
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BPV to BOV

Ive heard alot of talk about people running BPV's that vent atmospherically. Is there any difference between this and a BOV asides their original intended purposes? Is it as simple as taking my stock BPV and disconnecting the exhaust side hose from it to allow for atmospheric venting?
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Old 02-01-2006, 11:13 AM   #2
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wat do you meen exhaust sode?
yur saying the side that dumps back into the intake?
yes its basicly just disconect that plug up the intake and you now have a bov... theoreticly
wont work on a t7
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Old 02-01-2006, 11:17 AM   #3
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I guess re-circ side would be a better term to use, but yea, are there any detailed directions on this that anyone knows up? I wouldnt imagine you would want to plug up the intake side as well but I really dont know how this whole thing works, just seen people saying they have a stock BPV venting atmospherically

Eric P had some info on his site about it a while back but if I remember correctly it was pretty vague.
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Old 02-01-2006, 11:38 AM   #4
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What year/model car do you drive?
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Old 02-01-2006, 11:56 AM   #5
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96 900SE, T5 (so no MAF) and BOV's arent a problem.
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Old 02-01-2006, 12:55 PM   #6
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well the ghetto way (and it sounds like crap i did it while waiting for my hks to get here) is to just unhook the side that goes into the turbo intake and plug the hole on the turbo intake so it just vents the air to the atmo...if yuo do any tuning tho you will overpower the stock bpv



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Old 02-01-2006, 12:59 PM   #7
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You can do what saabkid says, but switch the orientation of the bpv. I've got the forge in my 9k oriented the opposite way of the factory one and plumbed back into the intake...yes it works...yes it sounds different.
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Old 02-01-2006, 01:06 PM   #8
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wait...what did you do mike?



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Old 02-01-2006, 01:32 PM   #9
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Take the bpv, switch the orientation around. I've got a pic of it on my webpage, but the server hasn't been cooperating lately.

I took the bpv so the vaccum line points up at the sky...make sense now?
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Old 02-01-2006, 01:54 PM   #10
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How the heck does that work???
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Old 02-01-2006, 01:58 PM   #11
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Quote:
Originally Posted by JK9000s
How the heck does that work???
second that
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Old 02-01-2006, 02:06 PM   #12
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Quote:
Originally Posted by JK9000s
How the heck does that work???
I don't know how else to explain it without a pic....but what I did was install it so the port that normally goes to the ic pipe is instead on the intake and vice versa.

edit...It'd be a little different on a ng900/9-3....and I'll go try and take a pic that MAYBE I can get hosted somewhere.
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Old 02-01-2006, 02:08 PM   #13
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Quote:
Originally Posted by mcrowley
I don't know how else to explain it without a pic....but what I did was install it so the port that normally goes to the ic pipe is instead on the intake and vice versa.

edit...It'd be a little different on a ng900/9-3....and I'll go try and take a pic that MAYBE I can get hosted somewhere.
I have a photo bucket account if you want to e-mail the pic to me Ill host it for everyone. [email protected]
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Old 02-01-2006, 03:15 PM   #14
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You've got mail.
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Old 02-01-2006, 03:43 PM   #15
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Here you boys go, thanks for the pics Mcrowley.

"2 pics of 9000 engine bay, normally the round part of the bpv would
face the front of the car, not up like shown in pics"

Now I understand, the visual definatly helped; the smaller of the vacuum lines which is now facing up, usually faces foward, so the peice facing downwards is usually the part that comes off the delivery pipe, correct?


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Old 02-01-2006, 03:47 PM   #16
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your forge valve is different then mine right? it recirculates it right?
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Old 02-01-2006, 03:50 PM   #17
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Quote:
Originally Posted by AeroDynamic
your forge valve is different then mine right? it recirculates it right?
Yea, that is a BPV not a BOV so it re-circs instead of atmospherically venting, though the way its set up it is venting to the atmoshpere...confusing.
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Old 02-01-2006, 03:51 PM   #18
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Quote:
Originally Posted by CooperS7777
Now I understand, the visual definatly helped; the smaller of the vacuum lines which is now facing up, usually faces foward, so the peice facing downwards is usually the part that comes off the delivery pipe, correct?
Exactly. Valve works just fine this way...all you'd have to do is remove that bottom hose and you'd kinda have a pull type bov much like the hks one...which is kinda what the Forge sounds like plumbed this way on my car. The 9k and ng900/9-3 have the same stock bpv...so I think you can probably figure it out on your car from the pics.
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Old 02-01-2006, 03:52 PM   #19
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Quote:
Originally Posted by CooperS7777
Yea, that is a BPV not a BOV so it re-circs instead of atmospherically venting, though the way its set up it is venting to the atmoshpere...confusing.
Well its not really venting to the atmosphere...the atmosphere in my case is the intake duct.

edit-see the above post
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Old 02-01-2006, 04:01 PM   #20
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mcrowley... i must compliment your clean engine bay... It looks pretty damn nice
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