BOV

choonzAWR · 06-20-2003, 10:51 AM

has anyone installed a BOV on their STi yet? i'm thinking thats the only mod i'll get besides an exhaust when i get mine.

will the BOV screw anything up? maybe mess up the ECU?
and does it void warranty?

oh ye.. my purpose of getting the BOV and exhaust is purely for sound... not performance. i think i'm gonna get enough of performance from the stock car alone.... i'm goin from a 2k1 civic to an STi.... very big jump =]

***MKIVSupra*** · 06-20-2003, 11:49 AM

You can actually loose a few hp with a BOV. Do a search and read some of the previous posts on this.

hommerSTI · 06-20-2003, 12:33 PM

I have a BOV(GFB), AEM cold air , GFB catless down pipe wishen for a CATBACK!!!!!!!!! It's all good, bov are cool,no problems. I have kicked more ASS with my little STi, then you can shake a stick at!

CloNeGTS · 06-20-2003, 03:24 PM

There really is no reason for a BOV unless you are running so much boost that the stock unit can't hold it. In addition, a BOV that is vented to atmos is asking for trouble....you will be running VERY rich while shifting. If you vent back to intake, you should be ok, but again....that doesn't give the huge sound the atmos vent does.

Search around....I know we just talked about this lately.

choonzAWR · 06-22-2003, 12:17 AM

whats running rich mean? and what would end up happening when you run "too" rich? sorry i'm not that good with cars yet.

so basically if you get a BOV you need a boost controller? or can you have it purely for sound reasons? and what do you need with it so that it doesn't mess up everything else?

Hispanics · 06-22-2003, 02:23 AM

Rich means you are burning more fuel than needed in your Air/Fuel mixture. Lean is more air than fuel. Lean is definetly worse for your engine. Lean conditions will create detonation. If you get a BOV you will need you run the vented air back into the intake. There for you won't get the sound. Or you can be a ginnie pig and try it and let us know how your engine is running!

CloNeGTS · 06-22-2003, 06:56 AM

Rich and lean are air/fuel mixtures..not exactly what your car is burning. If you run rich, you end up just wasting fuel, lining the cylinder walls with the excess gas. Just not a smart idea to have too much gas in a cylinder.

Don't take offense to this, but I wouldn't be making changes like a BOV if you aren't familiar with terms like lean/rich. A turbo car is a very technical machine and even I am not going to go changing engine/turbo parts without someone with more experience saying that it's alright and worth doing.

choonzAWR · 06-22-2003, 08:19 AM

thx man.. yeah i was kinda iffy about modding, but i think i'll just keep it the way it is until i understand more about this stuff... thx again

SnowbordrWRX · 06-22-2003, 03:43 PM

Do a search and you'll find a thread where someone mentioned a "fake" BOV that makes only the sound but doesn't vent any air. :roll: I personally think it's kinda dumb and the money would be better spent on/saved towards a real performance mod. If all you want is the sound, why not just roll down your window and go, "pssh! pssh!" every time you're shifting?

choonzAWR · 06-22-2003, 08:23 PM

that works =]]~ hahhaha can you hear the stock BOV pretty well? i heard from some friends that own a WRX that they could kinda hear the stock BOV through their aftermarket intake

SnowbordrWRX · 06-22-2003, 08:52 PM

Stock BOV? What BOV? Neither the STi nor the regular WRX come with a BOV standard!

Hispanics · 06-23-2003, 03:14 AM

I belive they don't call the stock unit a blow off valve. It's something else. Can't think of it now. But it does the same funtion.

Hispanics · 06-23-2003, 04:11 AM

:wink:

CloNeGTS · 06-23-2003, 04:17 AM

Usually owners call it a bypass valve. The Tech Manual calls it an "air by-pass valve." I'm guessing from the DV in the article above that the another name might be diverter valve...dunno bout that one though.

Hispanics · 06-23-2003, 04:18 AM

Ok I found an article in SCC mag that tested it!

06-20-2003, 10:51 AM	#1
choonzAWR Professional STI Driver Car: Aspen White 04 STi Location: Bristow, VA Posts: 421 Join Date: May 2003 Trader Rating: (0)	has anyone installed a BOV on their STi yet? i'm thinking thats the only mod i'll get besides an exhaust when i get mine. will the BOV screw anything up? maybe mess up the ECU? and does it void warranty? oh ye.. my purpose of getting the BOV and exhaust is purely for sound... not performance. i think i'm gonna get enough of performance from the stock car alone.... i'm goin from a 2k1 civic to an STi.... very big jump =] This ad is not endorsed by this member. Please register or login to hide this ad.

06-20-2003, 11:49 AM	#2
*MKIVSupra* Moderator Elite Car: 04 Subaru WRX STi, W Fav Mod: KartBoy SS & Bushings Location: Illinois Posts: 8,744 Join Date: Jan 2001 Trader Rating: (0)	check this out... You can actually loose a few hp with a BOV. Do a search and read some of the previous posts on this.

06-22-2003, 03:43 PM	#9
SnowbordrWRX Drive True Posts: 1,337,039 Join Date: May 2002 Trader Rating: (0)	Sound System Forum Do a search and you'll find a thread where someone mentioned a "fake" BOV that makes only the sound but doesn't vent any air. :roll: I personally think it's kinda dumb and the money would be better spent on/saved towards a real performance mod. If all you want is the sound, why not just roll down your window and go, "pssh! pssh!" every time you're shifting?

06-23-2003, 03:14 AM	#12
Hispanics Senior STI Driver Location: Long Island NY Posts: 362 Join Date: Apr 2003 Trader Rating: (0)	fmic mod on wrx (pics from i-club midatlantic meet) I belive they don't call the stock unit a blow off valve. It's something else. Can't think of it now. But it does the same funtion.

06-20-2003, 12:33 PM	#3
hommerSTI Amateur STI Driver Posts: 28 Join Date: Jun 2003 Trader Rating: (0)	I have a BOV(GFB), AEM cold air , GFB catless down pipe wishen for a CATBACK!!!!!!!!! It's all good, bov are cool,no problems. I have kicked more ASS with my little STi, then you can shake a stick at!

06-20-2003, 03:24 PM	#4
CloNeGTS S204 Racer Car: Solo II, WRC Location: Overland Park, KS Posts: 2,776 Join Date: Oct 2002 Trader Rating: (1)	There really is no reason for a BOV unless you are running so much boost that the stock unit can't hold it. In addition, a BOV that is vented to atmos is asking for trouble....you will be running VERY rich while shifting. If you vent back to intake, you should be ok, but again....that doesn't give the huge sound the atmos vent does. Search around....I know we just talked about this lately.

06-22-2003, 12:17 AM	#5
choonzAWR Professional STI Driver Car: Aspen White 04 STi Location: Bristow, VA Posts: 421 Join Date: May 2003 Trader Rating: (0)	whats running rich mean? and what would end up happening when you run "too" rich? sorry i'm not that good with cars yet. so basically if you get a BOV you need a boost controller? or can you have it purely for sound reasons? and what do you need with it so that it doesn't mess up everything else?

06-22-2003, 02:23 AM	#6
Hispanics Senior STI Driver Location: Long Island NY Posts: 362 Join Date: Apr 2003 Trader Rating: (0)	Rich means you are burning more fuel than needed in your Air/Fuel mixture. Lean is more air than fuel. Lean is definetly worse for your engine. Lean conditions will create detonation. If you get a BOV you will need you run the vented air back into the intake. There for you won't get the sound. Or you can be a ginnie pig and try it and let us know how your engine is running!

06-22-2003, 06:56 AM	#7
CloNeGTS S204 Racer Car: Solo II, WRC Location: Overland Park, KS Posts: 2,776 Join Date: Oct 2002 Trader Rating: (1)	Rich and lean are air/fuel mixtures..not exactly what your car is burning. If you run rich, you end up just wasting fuel, lining the cylinder walls with the excess gas. Just not a smart idea to have too much gas in a cylinder. Don't take offense to this, but I wouldn't be making changes like a BOV if you aren't familiar with terms like lean/rich. A turbo car is a very technical machine and even I am not going to go changing engine/turbo parts without someone with more experience saying that it's alright and worth doing.

06-22-2003, 08:19 AM	#8
choonzAWR Professional STI Driver Car: Aspen White 04 STi Location: Bristow, VA Posts: 421 Join Date: May 2003 Trader Rating: (0)	thx man.. yeah i was kinda iffy about modding, but i think i'll just keep it the way it is until i understand more about this stuff... thx again

06-22-2003, 08:23 PM	#10
choonzAWR Professional STI Driver Car: Aspen White 04 STi Location: Bristow, VA Posts: 421 Join Date: May 2003 Trader Rating: (0)	that works =]]~ hahhaha can you hear the stock BOV pretty well? i heard from some friends that own a WRX that they could kinda hear the stock BOV through their aftermarket intake

06-22-2003, 08:52 PM	#11
SnowbordrWRX Drive True Posts: 1,337,039 Join Date: May 2002 Trader Rating: (0)	Stock BOV? What BOV? Neither the STi nor the regular WRX come with a BOV standard!

06-23-2003, 04:11 AM	#13
Hispanics Senior STI Driver Location: Long Island NY Posts: 362 Join Date: Apr 2003 Trader Rating: (0)	:wink:

06-23-2003, 04:17 AM	#14
CloNeGTS S204 Racer Car: Solo II, WRC Location: Overland Park, KS Posts: 2,776 Join Date: Oct 2002 Trader Rating: (1)	Usually owners call it a bypass valve. The Tech Manual calls it an "air by-pass valve." I'm guessing from the DV in the article above that the another name might be diverter valve...dunno bout that one though.