996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

BOV vs DV's with high boost?

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Old 05-10-2014 | 12:04 PM
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BOV vs DV's with high boost?

Just wondering why people choose BOV over DV's when running high boost?? Or does it not really matter that much.


Thanks for any help.
 
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Old 05-10-2014 | 12:07 PM
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Where is your tuner/ builder? bov's mafless... DV's went you run a maf.. boost levels do not matter.
 
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Old 05-10-2014 | 12:17 PM
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Originally Posted by Tim941NYC
Where is your tuner/ builder? bov's mafless... DV's went you run a maf.. boost levels do not matter.
Oh ok cool, thanks....
 
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Old 05-10-2014 | 02:07 PM
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My understanding (and please do correct me if I'm wrong) is that bov, bpv(by pass valves), and dv are all pretty much same thing. Typically people who run aftermarket Bov typically vent to atmosphere to make that cool sound, but if you're on a stockish ecu, the computer is expecting that rerouted air, so if you do vent out, you will have very rich conditions when you are letting off.
As far as higher boost, most of these valves should make a tighter seal with more boost, I'm not sure if the stock DVs work that way, if not I would see why one would change it out for high boost applications.
 
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Old 05-10-2014 | 05:17 PM
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Originally Posted by YJosephTT
My understanding (and please do correct me if I'm wrong) is that bov, bpv(by pass valves), and dv are all pretty much same thing. Typically people who run aftermarket Bov typically vent to atmosphere to make that cool sound, but if you're on a stockish ecu, the computer is expecting that rerouted air, so if you do vent out, you will have very rich conditions when you are letting off.
As far as higher boost, most of these valves should make a tighter seal with more boost, I'm not sure if the stock DVs work that way, if not I would see why one would change it out for high boost applications.

Nice, thanks!! Yea I run the Forge DV's now. I guess if need be I could just have them dump to atmosphere.
 
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Old 05-10-2014 | 06:45 PM
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If you remove the maf and stock air box (which you will with any high hp build) you need BOV valves in either the y pipe or in the I/c. You Ned to be able to release the pressure during the shift or slow down.
 
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Old 05-10-2014 | 06:53 PM
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Originally Posted by 32krazy!
If you remove the maf and stock air box (which you will with any high hp build) you need BOV valves in either the y pipe or in the I/c. You Ned to be able to release the pressure during the shift or slow down.
Cant you just have the DV vent to atmosphere?
 
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Old 05-10-2014 | 07:04 PM
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Originally Posted by Wealth Manager
Cant you just have the DV vent to atmosphere?
That's a valid question and I don't have a definite answer other than I don't think they can handle the pressure of say a 2 bar tune. I can't think of a single high hp build that uses diverter valves on any make of car

Did a quick search and the consensus is they can't handle high boost
 

Last edited by 32krazy!; 05-10-2014 at 07:11 PM.
  #9  
Old 05-10-2014 | 07:07 PM
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Originally Posted by Wealth Manager
Cant you just have the DV vent to atmosphere?
I believe a few guys have It Ike that. But never did it myself. We usually put them on y pipe or ics.
 
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  #10  
Old 05-10-2014 | 07:27 PM
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Also I could run just one BOV in the center of the Y pipe if I wanted, right? Also where are the vacuum lines ran to? the waste gate?

Also if you delete the DV's and that tube they sit in do you have to do anything about that? weld something close?


I don't know this area that well and just trying to learn here
 
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Old 05-10-2014 | 08:08 PM
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Originally Posted by Wealth Manager
Also I could run just one BOV in the center of the Y pipe if I wanted, right? Also where are the vacuum lines ran to? the waste gate?

Also if you delete the DV's and that tube they sit in do you have to do anything about that? weld something close?


I don't know this area that well and just trying to learn here
Yes 1 in the center is fine. If you delete the divertors you remove the tubing and the air box
 
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Old 05-10-2014 | 08:17 PM
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I always thought the best place for the BOV is after the turbo.
If you're trying to protect it from surge, that would be the logical location.
 
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Old 05-10-2014 | 08:41 PM
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Originally Posted by 32krazy!
Yes 1 in the center is fine. If you delete the divertors you remove the tubing and the air box

Cool thanks. So the DV hooked up to the y pipe and air box?


Originally Posted by YJosephTT
I always thought the best place for the BOV is after the turbo.
If you're trying to protect it from surge, that would be the logical location.
I see from my research most guys are running BOV's on the Y pipe.
 
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Old 05-10-2014 | 09:16 PM
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Originally Posted by Wealth Manager
Cool thanks. So the DV hooked up to the y pipe and air box?


air box not the y pipe. if your running mafless typically the build uses either filters on the turbos or in the i/c area eliminating the air box and associated piping. so you lose the placement of the diverters and need to find a suitable place for the bov's

I see from my research most guys are running BOV's on the Y pipe.
the y pipe is the most visual and easiest to work with but you can do them on the intercoolers as well if theres space and you don't want quite as much noise.(using the bumper to muffle the sound somewhat)
 
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Old 05-10-2014 | 09:39 PM
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have bov in place of my two dvs, the two dvs made a very nice sound , when i changed the piping i lost that great sound so i went to the bov . the sound is not that great but it's back and the responce is way better with the new piping
 


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