Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

BOV Problems.....

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Old Jun 3, 2005 | 07:03 PM
  #1  
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Car Info: 07 Silver Mazdaspeed 3
Unhappy BOV Problems.....

I put a new turbo xs bov on my 04 sti and now my car is backfireing. I have tried adjusting it to no avail. Has anyone else encountered this prob and how should I go about fixing it?
Old Jun 3, 2005 | 07:43 PM
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im sure the gurus will chim in but it is my understanding that a bov during shifts backfires becuase it makes the car run rich. It isnt a huge deal just going to waste some gas.
Old Jun 3, 2005 | 09:32 PM
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Originally Posted by okpanic
I put a new turbo xs bov on my 04 sti and now my car is backfireing. I have tried adjusting it to no avail. Has anyone else encountered this prob and how should I go about fixing it?
easy... put your stock by pass valve back on. if not then live with the backfiring due to the car running rich
Old Jun 20, 2005 | 06:14 PM
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Originally Posted by BLITZSTI
easy... put your stock by pass valve back on. if not then live with the backfiring due to the car running rich
yup that solves the problem

the stock bov recircs back to the intake. thats why you hva eto block it off

the engine is expecting the extra air so it adds fuel

the air never gets there so the fuel goes un burnt and ignites in the exhaust.

put your BOV to the stock settings it had
Old Jun 20, 2005 | 07:48 PM
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afterfire you mean
Old Jul 2, 2005 | 07:04 AM
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will custom tuned em fix this problem?
Old Jul 2, 2005 | 07:05 AM
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Originally Posted by jkonquer
will custom tuned em fix this problem?
Nope.
Old Jul 3, 2005 | 10:25 PM
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Originally Posted by kspek
afterfire you mean
Smarty-pants!

BOVs that don't recirculate are bad, m'kay.
Old Jul 6, 2005 | 12:25 AM
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Originally Posted by jkonquer
will custom tuned em fix this problem?
an AEM standalone and convert to MAP system..
Old Jul 11, 2005 | 11:23 AM
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If you went with an aftermarket BOV for the sound, then this wont help, but I purchased the Greddy Type-S BOV, it recurculates and has adjustable tension if you want to up the boost. I've been happy with it so far.
Old Jul 13, 2005 | 11:27 AM
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Originally Posted by wrxpaul
an AEM standalone and convert to MAP system..
also known as a speed density system.
Old Aug 2, 2005 | 02:12 PM
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one more thing bad about the VTA BOVs is it's possible of carbon build-ups around exhaust ports in long run.

those of you had BOV on VTA for @ least a month... have you notice any power drops? Had mine on for a while, swapped back the stock bypass, and noticeable amount of power came back.

Last edited by quad3d@work; Aug 2, 2005 at 02:14 PM.
Old Aug 3, 2005 | 06:04 PM
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Originally Posted by quad3d@work
one more thing bad about the VTA BOVs is it's possible of carbon build-ups around exhaust ports in long run.

those of you had BOV on VTA for @ least a month... have you notice any power drops? Had mine on for a while, swapped back the stock bypass, and noticeable amount of power came back.
I didn't notice any power drops but when I put the stock back on today there was alot of carbon on the piston of the vta.
Old Aug 4, 2005 | 03:13 AM
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try looking into the gfb bovs... they offer hybrid types that may be a compromise of what you want- BOV's... everyone trys it.. at least once right? i had my bov on for 2 weeks- sold it right after. enjoyed the sound, slight decrease in hp according to my butt dyno.... had to get rid of it. i have better priorities than scaring lil girls and ol ladies driving their tree huggin civic hybrids




aloha from the summit of *-^-Mauna Kea-^-*
Old Aug 11, 2005 | 06:21 PM
  #15  
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I have been reading up on the wrox tuning dual stage bov. Has anyone got one of these?
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