Welcome to the North American Subaru Impreza Owners Club Sunday May 27, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Newbies & FAQs

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 08-24-2008, 08:14 PM   #1
darinzor
Scooby Newbie
 
Member#: 187731
Join Date: Aug 2008
Chapter/Region: NWIC
Location: gresham, OR
Vehicle:
2006 wrx
wr blue

Question aftermarket bov on stock turbo

hello i just have one simple question and im sure it has been asked many times but i have to know. i have a 06 wrx it has a short ram intake and a catback exhaust (i jus bought it not to long ago) and so my friend said i should get a BOV cause its better for the turbo....so i got one and then i started reading and hearing that unless your running non stock boost its bad for the car and i should go buy the stock BPV again.

so in short unless your running above stock boost its useless to have a after market BOV on my car and i should go buy another stock BPV.

thank you for all that help with this.
* Registered users of the site do not see these ads.
darinzor is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-24-2008, 08:32 PM   #2
YCT
Scooby Specialist
 
Member#: 122167
Join Date: Aug 2006
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
2008 Mazda CX-9 GT
Liquid Platinum Metallic

Default

yes, go back to your stock and sell the aftermarket valve you have.
YCT is offline   Reply With Quote
Old 08-24-2008, 08:32 PM   #3
patsy630
Scooby Newbie
 
Member#: 164420
Join Date: Nov 2007
Chapter/Region: Tri-State
Location: new jersey
Vehicle:
2004 STi
WRB stage 2

Default

keep the stock bpv unless you have some serious mods, aftermarket bov make your car run like crap.
patsy630 is offline   Reply With Quote
Old 08-24-2008, 08:34 PM   #4
Tdonk22
Scooby Newbie
 
Member#: 183304
Join Date: Jun 2008
Chapter/Region: NWIC
Location: Bellevue Washington
Vehicle:
2006 WRX Wagon
93 MR2

Default

read this...it should help

http://forums.nasioc.com/forums/showthread.php?t=468038

I would say don't waste your money....stay stock
Tdonk22 is offline   Reply With Quote
Old 08-24-2008, 08:58 PM   #5
Impreza541
Scooby Specialist
 
Member#: 160822
Join Date: Oct 2007
Location: Gresham, OR
Vehicle:
2007 Forester XT
Beige

Default

Dude dont listen to these guys. Yeah it makes your car run just a tad rich between shifts but its really not doing any damage AT ALL. Ive got an 06, with a catback and a BOV and my car runs great. I enjoy listening to the noise.

If you want the noise then yeah I say go for it. Most suby owners I see in portland run BOV's.
Impreza541 is offline   Reply With Quote
Old 08-24-2008, 09:04 PM   #6
subaru0276
Scooby Specialist
 
Member#: 172940
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: a sunny place in pa
Vehicle:
06 LiftdFOZonsteel
ifudontknowicanthelpu

Default

Yeah, wasting fuel is fun and it isnt good for the car!
subaru0276 is offline   Reply With Quote
Old 08-24-2008, 09:12 PM   #7
N/A_junkie
Scooby Specialist
 
Member#: 99961
Join Date: Nov 2005
Chapter/Region: MWSOC
Location: Columbus, OH/Ashland, KY
Vehicle:
03 Super Obnoxious
Wrx. A rare blue one.

Default

Quote:
Originally Posted by Impreza541 View Post
Dude dont listen to these guys. Yeah it makes your car run just a tad rich between shifts but its really not doing any damage AT ALL. Ive got an 06, with a catback and a BOV and my car runs great. I enjoy listening to the noise.

If you want the noise then yeah I say go for it. Most suby owners I see in portland run BOV's.
yeah dude!! i know it doesn't do any damage i've taken my motor apart 17 times now to check and i KNOW it doesn't do anything!!! these motors love getting coated with raw fuel!

do some research...yeah i bet that rich period between shifts isn't clogging up the cats in your downpipe at all.

ever tried it again with the stock bpv? i bet your car will be fastAr with it.
N/A_junkie is offline   Reply With Quote
Old 08-24-2008, 09:12 PM   #8
Impreza541
Scooby Specialist
 
Member#: 160822
Join Date: Oct 2007
Location: Gresham, OR
Vehicle:
2007 Forester XT
Beige

Default

Quote:
Originally Posted by subaru0276 View Post
Yeah, wasting fuel is fun and it isnt good for the car!
Never said it was good for the car. It doesnt affect driveablilty. Besides hes running an 06, any excess fuel that would escape would just go through and maybe afterfire, his up pipe is catless so no worries there.

I swapped my BPV with my BOV many times and I cant tell any difference. Even if there is a difference it isnt noticeable.
I simply do not see a problem with running a BOV.

So flame me all you want, nothin new on this forum.
Impreza541 is offline   Reply With Quote
Old 08-24-2008, 09:14 PM   #9
N/A_junkie
Scooby Specialist
 
Member#: 99961
Join Date: Nov 2005
Chapter/Region: MWSOC
Location: Columbus, OH/Ashland, KY
Vehicle:
03 Super Obnoxious
Wrx. A rare blue one.

Default

Quote:
Originally Posted by Impreza541 View Post
Dude dont listen to these guys. Yeah it makes your car run just a tad rich between shifts but its really not doing any damage AT ALL. Ive got an 06, with a catback and a BOV and my car runs great. I enjoy listening to the noise.

If you want the noise then yeah I say go for it. Most suby owners I see in portland run BOV's.
yeah dude!! i know it doesn't do any damage i've taken my motor apart 17 times now to check and i KNOW it doesn't do anything!!! these motors love getting coated with raw fuel!

do some research...yeah i bet that rich period between shifts isn't clogging up the cats in your downpipe at all.

ever tried it again with the stock bpv? i bet your car will be fastAr with it.

and all those cars running around in Portland...are probably tuned for it.

EDIT: damn the weird double post...delete post 7 if you want mods
N/A_junkie is offline   Reply With Quote
Old 08-24-2008, 09:17 PM   #10
Impreza541
Scooby Specialist
 
Member#: 160822
Join Date: Oct 2007
Location: Gresham, OR
Vehicle:
2007 Forester XT
Beige

Default

Quote:
Originally Posted by N/A_junkie View Post
yeah dude!! i know it doesn't do any damage i've taken my motor apart 17 times now to check and i KNOW it doesn't do anything!!! these motors love getting coated with raw fuel!

do some research...yeah i bet that rich period between shifts isn't clogging up the cats in your downpipe at all.

ever tried it again with the stock bpv? i bet your car will be fastAr with it.

and all those cars running around in Portland...are probably tuned for it.

Whatever man, believe what you want.
Impreza541 is offline   Reply With Quote
Old 08-24-2008, 09:18 PM   #11
N/A_junkie
Scooby Specialist
 
Member#: 99961
Join Date: Nov 2005
Chapter/Region: MWSOC
Location: Columbus, OH/Ashland, KY
Vehicle:
03 Super Obnoxious
Wrx. A rare blue one.

Default

Quote:
Originally Posted by Impreza541 View Post
Whatever man, believe what you want.
haha

so you're saying all the research...and tests...and data logs...are all moot?
N/A_junkie is offline   Reply With Quote
Old 08-24-2008, 09:25 PM   #12
Impreza541
Scooby Specialist
 
Member#: 160822
Join Date: Oct 2007
Location: Gresham, OR
Vehicle:
2007 Forester XT
Beige

Default

Quote:
Originally Posted by N/A_junkie View Post
haha

so you're saying all the research...and tests...and data logs...are all moot?

Dude all that I am saying is that I have had no problems.

If you want a BOV then get a BOV.
Impreza541 is offline   Reply With Quote
Old 08-25-2008, 05:39 AM   #13
i_c_the_light
Scooby Guru
 
Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
Vehicle:
1994 Legacy
"The Silver Slug"

Default

Running a BOV or a BPV makes no difference. Despite what people think or believe. Folks in Aus/NZ have been using them for years (longer than the WRX has been in the US) with no ill effects, and because they are JDM doesn't change anything...unless the USDM WRX is so **** that it blows up as soon as the A/F ratio changes the mere slightest and requires full on EM and tuning just for a TBE, pod filter, MBC and BOV.
i_c_the_light is offline   Reply With Quote
Old 08-25-2008, 06:05 AM   #14
viper74656
Scooby Specialist
 
Member#: 84758
Join Date: Apr 2005
Chapter/Region: MAIC
Location: Dover DE
Vehicle:
'04 WRB WRX

Default

Quote:
Originally Posted by i_c_the_light View Post
...unless the USDM WRX is so **** that it blows up as soon as the A/F ratio changes the mere slightest and requires full on EM and tuning just for a TBE, pod filter, MBC and BOV.
Yes it is, and yes it does. (Its late, or early and my sarcasm meter is broken so if you're joking then I'll just go )

BOV ain't gonna blow anybodys engine though, which I guess was the point you were making...

Stupid emissions requirements
viper74656 is offline   Reply With Quote
Old 08-25-2008, 06:45 AM   #15
i_c_the_light
Scooby Guru
 
Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
Vehicle:
1994 Legacy
"The Silver Slug"

Default

Quote:
Originally Posted by viper74656 View Post
Yes it is, and yes it does. (Its late, or early and my sarcasm meter is broken so if you're joking then I'll just go )

BOV ain't gonna blow anybodys engine though, which I guess was the point you were making...

Stupid emissions requirements
1/2 and 1/2 with the joking part. Honest to god with my Legacy GT I've upped the turbocharger, wound up the boost, found a BOV (cos the factory valves found on the EJ20G leak) and it still goes and goes good. The only thing that iffs me is the previous owner replaced the factory DP with a 3" catless and didn't get a hole tapped for the EGT, so the car runs really super rich on cold start up and runs rich in general.
All this without a tune, and has never even been put on a dyno before. Estimates are now roughly 180-190WHP (remember this a 1st generation Legacy). When I get the EGT sorted out I'll be putting in a different ECU which has been chipped and tuned in a different car altogether (ECU is from a 1992 Legacy RS and has a Link chip in it - guy I got it off said it gave his car a 47HP increase at factory 9psi - I doubt I'll see that kind of gain with it, but enough to make me smile - and it's not even tuned for my car at all) and that'll boost output to an estimated 230WHP. Then I'll throw it on a dyno and get some actual figures.

Pretty much that whole spiel goes against what 99% of NASIOC members believe or do when it comes to power modification, and I know because I've read countless responses to questions about putting in a bigger turbocharger or upping the boost and they all pretty much have the same idea: tune.

So I can imagine how many folks who read what I've done without a tune will think I'm a muppet and will eventually blow up my engine. 198,000km and still strong. Heck I've even got some N/A engine bits in there too!
i_c_the_light is offline   Reply With Quote
Old 08-25-2008, 07:06 AM   #16
viper74656
Scooby Specialist
 
Member#: 84758
Join Date: Apr 2005
Chapter/Region: MAIC
Location: Dover DE
Vehicle:
'04 WRB WRX

Default

Quote:
Originally Posted by i_c_the_light View Post
Pretty much that whole spiel goes against what 99% of NASIOC members believe or do when it comes to power modification, and I know because I've read countless responses to questions about putting in a bigger turbocharger or upping the boost and they all pretty much have the same idea: tune.

Thats just it, you are doing this on a 1990 Legacy. VERY different ECU than what late model WRXs are saddled with. You'll notice the 02-03 WRX takes to mods (intake, exhaust, etc) much better than the 04+ do. Read up on Open Loop/Closed Loop delay, thats what 04+ WRXs have to deal with. The more stringent emmissions requirements have gotten the more Subaru has had to fiddle with the ECU to keep the WRX and STI in compliance. While other manufactuers have updated their engines and started using direct injection Subaru has used the same basic engine design since..... I don't even know when, Noah's ark?

Its not just people being over-cautios, take a look at some stock AFR plots. The WRX and even STI are super lean right out of the factory. Even the 08s have the same problems. Any additional power and the ECU can't cope and you're putting serious risk at blowing your engine. It pulls timing until it can't pull anymore and then boom. Subaru has these cars running right on the ragged edge to keep them emmissions compliant. Why do you think there are so many complaints agains SOA not fullfilling warranty fixes? Subaru would go bankrupt trying to fix all the damaged engines that people bring in. Mild modding shouldn't risk the life of your engine but with these cars it does.

Guys that come onto NASIOC from Europe and Australia are shocked at the amount of tuning we do because over there it is one of the last things on the mod list. They don't have to deal with the crazy factory ECU and tuning that emmissions laws have forced on us here. Older US cars (like your Legacy) don't have those issues either. Here with what we are workign with tuning MUST be the first step.

Sorry we're getting so off topic but I think this is why people are so down on BOVs on here. When a BOV is the first thing people look to do on their car its because they are following the "traditional" turbo-car mod path. But with Subarus being the way they are, doing Intake/Exhaust/BOV as first mods just isn't the way to go. We are trying to "head them off at the pass" so to speak. Don't want noobs getting to far down the wrong path and end up doing something that really may hurt their car.

Last edited by viper74656; 08-25-2008 at 07:17 AM.
viper74656 is offline   Reply With Quote
Old 08-25-2008, 08:49 AM   #17
i_c_the_light
Scooby Guru
 
Member#: 88618
Join Date: Jun 2005
Chapter/Region: SCIC
Location: New Zealand
Vehicle:
1994 Legacy
"The Silver Slug"

Default

Quote:
Originally Posted by viper74656 View Post
Thats just it, you are doing this on a 1990 Legacy. VERY different ECU than what late model WRXs are saddled with. You'll notice the 02-03 WRX takes to mods (intake, exhaust, etc) much better than the 04+ do. Read up on Open Loop/Closed Loop delay, thats what 04+ WRXs have to deal with. The more stringent emmissions requirements have gotten the more Subaru has had to fiddle with the ECU to keep the WRX and STI in compliance. While other manufactuers have updated their engines and started using direct injection Subaru has used the same basic engine design since..... I don't even know when, Noah's ark?

Its not just people being over-cautios, take a look at some stock AFR plots. The WRX and even STI are super lean right out of the factory. Even the 08s have the same problems. Any additional power and the ECU can't cope and you're putting serious risk at blowing your engine. It pulls timing until it can't pull anymore and then boom. Subaru has these cars running right on the ragged edge to keep them emmissions compliant. Why do you think there are so many complaints agains SOA not fullfilling warranty fixes? Subaru would go bankrupt trying to fix all the damaged engines that people bring in. Mild modding shouldn't risk the life of your engine but with these cars it does.

Guys that come onto NASIOC from Europe and Australia are shocked at the amount of tuning we do because over there it is one of the last things on the mod list. They don't have to deal with the crazy factory ECU and tuning that emmissions laws have forced on us here. Older US cars (like your Legacy) don't have those issues either. Here with what we are workign with tuning MUST be the first step.

Sorry we're getting so off topic but I think this is why people are so down on BOVs on here. When a BOV is the first thing people look to do on their car its because they are following the "traditional" turbo-car mod path. But with Subarus being the way they are, doing Intake/Exhaust/BOV as first mods just isn't the way to go. We are trying to "head them off at the pass" so to speak. Don't want noobs getting to far down the wrong path and end up doing something that really may hurt their car.

Yeah I know and fully get it. When I was questioning the strength of the US spec engines I knew that there are more limitations on the later versions, and that there was less of a limitation with the 02 but there was still limitations and a lesser tolerance to mods compared to the overseas models...but never knew it was that bad. BTW, my Legacy is JDM, not that it makes much difference, just pointing that out.
But the whole point of my previous post was really to compare the differences, which are huge, and using my car as an example. Realistically, the only mod that I will HAVE to tune for is larger injectors. 380cc is suffice for now at 14psi, which brings up another thing that will probably require tune for safety sake. I don't trust a factory JDM ECU to work good at over 17psi and I've heard that the MAP sensor doesn't like to be pushed past that either, but I could be wrong about that.
i_c_the_light is offline   Reply With Quote
Old 08-25-2008, 09:12 AM   #18
cmiller219
Scooby Specialist
 
Member#: 187179
Join Date: Aug 2008
Chapter/Region: MAIC
Location: Wherever
Vehicle:
14 STi
Cocain

Default

if u want a BOV get one. if u have a catles downpipe and exhaust and EM u will be perfectly fine but to just put it on it runs rich between shifts but will not ruin ur car. my buddy has an 05 put one on a week after he bought it new and has put 50,000 miles on it ans still no problems.
cmiller219 is offline   Reply With Quote
Old 08-25-2008, 09:53 AM   #19
smurfwrx
Scooby Guru
 
Member#: 151928
Join Date: Jun 2007
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
09 Triumph S3

Default

Yeah OP, it's never been asked before.... as you can see.

Do what you want. BOV's ARE NOT IDEAL, period. No one can argue with that. They won't make your car blow up but the car will not run optimally as it would with the BPV. If you want the sound, go right ahead.

It just always struck me funny that people would waste money on a part that makes their car not run as well but if you must have the sound, have at it.
smurfwrx is offline   Reply With Quote
Old 08-25-2008, 09:55 AM   #20
Super_HKS
Scooby Guru
 
Member#: 154434
Join Date: Jul 2007
Chapter/Region: NWIC
Location: USMC Land
Vehicle:
2009 WRX Hatch <@[email protected]>
SWP

Default

I have a 2005 wrx with all catless stage 2. My car pulls hard at around 240 WHP and idles fine. I have a turboXS rfl and love it. The bov will be fine on your car. All its going to do with a stock turbo is make a awesome noise and make your car backfire here and there. Id say keep it and enjoy shifting
Super_HKS is offline   Reply With Quote
Old 08-25-2008, 10:42 AM   #21
darinzor
Scooby Newbie
 
Member#: 187731
Join Date: Aug 2008
Chapter/Region: NWIC
Location: gresham, OR
Vehicle:
2006 wrx
wr blue

Default

thanks for all the advice um couldnt i go to my local subie dealership and get another stock BPV for my car?
darinzor is offline   Reply With Quote
Old 08-25-2008, 11:19 AM   #22
smurfwrx
Scooby Guru
 
Member#: 151928
Join Date: Jun 2007
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
09 Triumph S3

Default

you could, or find one on here in the private classifieds for a fraction of the cost.
smurfwrx is offline   Reply With Quote
Old 08-25-2008, 11:47 AM   #23
dremersvision
Scooby Specialist
 
Member#: 141272
Join Date: Feb 2007
Chapter/Region: MWSOC
Location: massillon,ohio
Default

Yea we see these questions once a week if not more. Do with your car what you wish but like with everything else in life. You are giving up one thing to have another. if you get the bov and are constantly venting then your gas needle is going to drop quick.
dremersvision is offline   Reply With Quote
Old 08-25-2008, 12:07 PM   #24
EJ20T
Scooby Newbie
 
Member#: 78773
Join Date: Jan 2005
Chapter/Region: South East
Location: Greensboro, NC
Vehicle:
04 Ford Cobra
Redfire

Default

Quote:
Originally Posted by Impreza541 View Post
Dude all that I am saying is that I have had no problems.


But that doesn't mean that someone else won't have a problem with it. I bought my car with an rfl on it. I've had no issues but a friend of mine tried one on his 04 and it ran like ****. Even with tuning it didn't like it. Went back to the stock bpv and it was perfect.
EJ20T is offline   Reply With Quote
Old 08-25-2008, 12:29 PM   #25
Super_HKS
Scooby Guru
 
Member#: 154434
Join Date: Jul 2007
Chapter/Region: NWIC
Location: USMC Land
Vehicle:
2009 WRX Hatch <@[email protected]>
SWP

Default

Quote:
Originally Posted by darinzor View Post
thanks for all the advice um couldnt i go to my local subie dealership and get another stock BPV for my car?
Search your local classified section. you can get a stock subaru BPV for 20-50 dollars.
The dealer will charge 150-300. ANything oem through the dealer sux.
Super_HKS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
BOV on stock turbo smallfrye Newbies & FAQs 14 09-14-2009 11:02 PM
Tial bov on stock turbo? fastlanerex Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 4 01-20-2008 12:57 PM
Aftermarket BOV on stock motor? yo14jman Newbies & FAQs 21 01-26-2007 10:37 PM
Did anyone running a BOV on stock wrx consider the spool up hit of the stock bov? alfriedesq Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 6 07-22-2002 12:26 PM
aftermarket bov for legacy turbo... subyspeed2 Legacy Forum 5 12-30-2001 05:22 PM

All times are GMT -4. The time now is 09:33 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.