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BOV Placement?!

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Old 08-10-2009, 09:43 PM
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Default BOV Placement?!

So...I was always under the impression that the BOV would go on the intake piping near the throttle body.... however a buddy of mine pointed out that when you place it before the intercooler you potentially limit the ammount of heat soak that your intercooler gets....just curious what most guys are doing..

Thoughts? Thanks....
Old 08-10-2009, 10:08 PM
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The majority seem to think that the bov needs to be as close to the throttle body as possible. I've also heard about placing them before the IC but I don't think I've ever seen a car set up that way. Never seen any evidence to back up either theory so I've just go with the majority on this one.
Old 08-10-2009, 10:57 PM
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Originally Posted by SKINNY69
The majority seem to think that the bov needs to be as close to the throttle body as possible. I've also heard about placing them before the IC but I don't think I've ever seen a car set up that way. Never seen any evidence to back up either theory so I've just go with the majority on this one.
Well thats what I am starting to wonder.... does everyone just go with the majority....?

I spent Saturday at Gateway Intl. Raceway outside STL at the ADRL Drags, and spent some time at the Procharger tent talking with Shannon from Procharger... and he seemed to say that neither way is "wrong" but going before the IC would clearly drop the IC heat soak....

To me it seems indisputable that if you have it placed before the intercooler you are letting out heated air that is going to be wasted anyway, long before it can heat soak the intercooler....

Im amazed we dont see it done this way most of the time.... the only drawbacks I can see is that the reference line would be slightly longer...and possibly more heat overall on the BOV?

Last edited by LS1Silverado05; 08-10-2009 at 11:38 PM.
Old 08-11-2009, 01:26 AM
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the farther the bov is placed from the throttle body, the longer it takes the pressure pulse to make it back to the bov- allowing it to be vented. then the turbo has to refill the cooler and pipe which equals lag
Old 08-11-2009, 01:40 AM
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Originally Posted by blkformula95
the farther the bov is placed from the throttle body, the longer it takes the pressure pulse to make it back to the bov- allowing it to be vented. then the turbo has to refill the cooler and pipe which equals lag
Which on an M6 might make some difference, but on an A4 where its staying on the floor that changes that whole thought...because you aren't coming out of it until the end of your run....at least I wont...if I lift...then the run is over anyway...
Old 08-11-2009, 01:44 AM
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also on an auto, placement on the intercooler may be beneficial because the shifts are so fast that the pressure wouldnt have time to make it back to the bov, causing it to never vent. no vent, no lag.
Old 08-11-2009, 02:29 AM
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Ive always placed mine close to the turbo, That way the turbo will have the pressure release the fastest an have less compressor surge.
Old 08-11-2009, 08:32 AM
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put it whereever the vacuum line will be the shortest
Old 08-11-2009, 10:42 AM
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You want it on the highest pressure point which is before the intercooler.
Old 08-11-2009, 10:44 AM
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aps does theres before and after the IC. so idk if that makes a bigg difference. my f-body kit is before ic. and the gto kit is after.
Old 08-11-2009, 10:44 AM
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Originally Posted by DrTurbo
You want it on the highest pressure point which is before the intercooler.
This sounds like a winning argument...

So what if any downfalls are there to putting it there?
Old 08-11-2009, 10:46 AM
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Originally Posted by LS1Silverado05
This sounds like a winning argument...

So what if any downfalls are there to putting it there?
No downfall other then the vacuum line may be long depending on the placement.
Old 08-11-2009, 01:20 PM
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so placed before the intercooler is the "best" setup for a race setup or better overall in general?

then wouldnt having it close to the outlet of the turbo be better to keep it more responsive?
Old 08-11-2009, 04:55 PM
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I run mine before the intercooler and I know on some MAF cars that running it after the intercooler has caused idle issues and even stall problems when letting off from full load.
Old 08-11-2009, 10:20 PM
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IMO as long as you run it before the MAF, you're fine. Tial is right, the shorter the hose, the better.
Old 08-12-2009, 07:27 AM
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i run mine right before the IC and my boost comes in at 2500-3000
Old 08-12-2009, 10:06 AM
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I'd rather put it closer to the turbo, I mean after all that is what the BOV is trying to protect.
Old 08-12-2009, 10:16 AM
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a lot of people put it before the IC because some have blown the IC during a surge.
Old 08-12-2009, 10:50 AM
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Originally Posted by smokinHawk
a lot of people put it before the IC because some have blown the IC during a surge.
After hearing everyone's thoughts I think I am going before the IC on my application.... There seems to be more advantages to going before IMO

Last edited by LS1Silverado05; 08-12-2009 at 09:59 PM.
Old 08-12-2009, 12:22 PM
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Originally Posted by flippincamaro
Ive always placed mine close to the turbo, That way the turbo will have the pressure release the fastest an have less compressor surge.
X2...agreed. It is a pressure relief valve, and you do want it close to the component it is protecting (compressor).

...exactly what slow67 said.


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