BOV Question - Subaru WRX Forum
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#1 Old 02-21-2006, 09:41 AM
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BOV Question

Just a quick question, I have a K&N Intake, and it makes a cool noise, I think its the bypass valve. I was wondering if i were to get a HKS SSQV would it sound good or would it sound goofy with the intake and the BOV.
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#2 Old 02-21-2006, 10:05 AM
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There are a lot of threads on this topic already. However an atmoshperic BOV is not necessary and actually will rob you of power on a relatively stock WRX. Until you start greatly increasing your boost (ie a new turbo), it is mrely for show and noise. It can also be detrimental to the longevity of your motor.

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#3 Old 02-21-2006, 10:18 AM
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time and time again people have shown that properly installed fully atmospheric BOVs do absolutely nothing good or bad to your performance or longevity...
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#4 Old 02-21-2006, 09:28 PM
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Quote:
Originally Posted by mosc
time and time again people have shown that properly installed fully atmospheric BOVs do absolutely nothing good or bad to your performance or longevity...

I agree, I have kept quiet since Cosmo stopped posting frequently. There are 2 schools of debate on this issue, those that say you are rich for a split second and those that say that you are not. I believe Cosmo's post about have datalogged it and there not being a rich condition.

a good link to Rain_ Racer that has posted links Turbo Timer harness for 05?

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#5 Old 02-22-2006, 09:09 AM
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I'm going to have to go back and find my old datalogs if I still have them.

But, no, a BOV will have NO effect on performace, one way or the other.
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#6 Old 02-22-2006, 10:25 AM
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Then again, what is the advantages of aftermarket bovs vs the stock one, can you make the stock one vent out without problems?
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#7 Old 02-22-2006, 10:51 AM
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the main reason to go with an aftermarket BOV is becuase they can hold more PSi than the stock one. As for making the stock VTA, I dont know if anyone has tried but I was thinking it might work if you blocked off the return line to the intake(I am not responsible for anything bad happening if you try this).

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#8 Old 02-22-2006, 10:54 AM
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Quote:
Originally Posted by PJ WRX 09
Just a quick question, I have a K&N Intake, and it makes a cool noise, I think its the bypass valve. I was wondering if i were to get a HKS SSQV would it sound good or would it sound goofy with the intake and the BOV.
as for answering your question, I have a similar setup, only I had my BOV first(about 1 year) and just installed my intake about a month ago. there is a slight delay between the 2 noises which was odd at first but I like it.

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#9 Old 02-22-2006, 11:54 AM
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Bov Gets No Love.....
It could possibly affect performance as stated by two very known PROFESSIONALS. 100% VTA's more so than 50/50 ones.And if you set it incorrectly it will affect your cars idle and possibly cause stalls.
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#10 Old 02-22-2006, 02:12 PM
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Yes, it could. Especially if installed incorrectly or improperly adjusted. But, that goes for any part.

In my experience (which is more than 20 different BOV's on 7 different cars) there is no change in AFR, idle, or performance if the BOV is working correctly.
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#11 Old 02-22-2006, 02:56 PM
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Quote:
Originally Posted by dumdum
Bov Gets No Love.....
It could possibly affect performance as stated by two very known PROFESSIONALS. 100% VTA's more so than 50/50 ones.And if you set it incorrectly it will affect your cars idle and possibly cause stalls.
During track conditions(like in your link) I could see how the rich condition might be a problem. But 95% of us here dont track or might go to the drag strip on the weekends and could very easily switch back to the stock BOV if there was a issue. I can only speak for my self but I have not had any adverse affects installing a VTA BOV my car.

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#12 Old 02-23-2006, 07:26 AM
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I ran a turboxs, and noticed nothing different with it on. BOV's are fine for the people that want them. I never understood why people hate them so much. I just got sick of people trying to race me, and if I had to do it again, would go for the ssqv.
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#13 Old 02-23-2006, 07:43 AM
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Ok sooo BOV does not CHANGE AFR or affect the performance?


My BOV made my car run rich and started to stain the back of my bumper. took car to dealer to get service "1st FREE oil change" and they told me its running rich and im loosing boost. "Which I noticed" so there for my experience with a BOV is bad.....there no good and just for noise.

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#14 Old 02-23-2006, 08:30 AM
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Quote:
Originally Posted by ManicsWrX
Ok sooo BOV does not CHANGE AFR or affect the performance?


My BOV made my car run rich and started to stain the back of my bumper. took car to dealer to get service "1st FREE oil change" and they told me its running rich and im loosing boost. "Which I noticed" so there for my experience with a BOV is bad.....there no good and just for noise.
There is no possible way a BOV could cause that much of a change in AFR if the BOV was installed correctly and was in proper working order.
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#15 Old 02-23-2006, 08:48 AM
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For what it's worth, I have a local friend here running two different BOVs on his car. He has a wideband from TurboXS and it doesn't affect his A/F. It was never even a concern that it would. He's running a Forge and Worx I think, I'm running and HKS SSQV, and I have another friend running a TurboXS RFL. None of us have the slighest problems with them.

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