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"The BIG BOV thread" (Where all bov question threads get merged)

2M views 12K replies 2K participants last post by  WRX-maniac 
#1 · (Edited by Moderator)
This is the big BOV thread. If you didn't find this thread, you didn't search.

This thread is where all BOV question threads get merged into.

The quote below in this first post is from our BOV info sticky and contains links to some very explanatory BOV information. Please take the time to explore the links before you ask repeated questions.

Thanks!


A stock WRX/STi comes with a BPV (Bypass valve) which is a vacuum-actuated valve designed to release pressure in the intake system when the throttle is lifted or closed. This air pressure is re-circulated back into the non-pressurized end of the intake before the turbo.

An after market blowoff valve (VTA) does basically the same thing BUT unlike the stock unit it releases air to the atmosphere (giving you the loud sound). Some people see an after market BOV on a stock WRX as being in poor taste (probably due to the fact that it is basically a noise maker that really as no other benefit), while others simply find the sound very attractive.

Proponent opinions notwithstanding, there is a small mechanical downside to having an after market BOV (VTA) on a stock WRX. The problem comes when releasing air to the atmosphere that has already been metered by the mass airflow sensor. When the BOV releases (blows off), the ECU will be injecting the wrong amount of fuel into the cylinders. The engine temporarily runs too rich (meaning too much fuel is injected into the cylinders). This temporary rich condition isn’t typically THAT harmful, but it may cause bucking or hesitation on lift-throttle as well as some other concerns outlined in the links below.


Links for BOV info:

Sinister's BOV FAQ

Wikipedia

Unabomber on Nasioc

Davenow on Nasioc





 
#7,306 ·
esco301 said:
Oh good... someone else noticed that too!
With all the leghumpers on this site, would you expect any different? :rolleyes:
Danielle knows what she's doing when she makes comments like those, don't ya, girl?
<cough cough...tease...cough cough>
 
#7,309 ·
Key to driving naked extra mpg:

.1)heavily tinted windowa 2)of course drive mostly at night 3)have pasties ready-more than two!! 4)no hot coffee in traffic 5)mace-for leghumpers 6)shave(all over) 7)dice-pep boy's is #1 8)Dog Whisperer Season #1 dvd box set-for 'real bad' doggs 9)All of the stickers mentioned in this thread and finally #10) Bend way over at speed to keep that 'aero push' to a minimum.......:p
 
#7,314 ·
you guys need to stop being such jerks, everyone knows that the purpose of the bov is for the loud noise, becuase when you only hear a slight discharge of air its a major leak, the more air you hear releasing and the higher pitched sound, the faster its going, the less air you hear the slower its going, doesn't anyone have common sense :screwy:
 
#7,316 ·
Weasel 555 said:
^^^ :rotfl: :rotfl:

whats even funnier is you have thought seriously about the ideas :rotfl:
+1

Yeah, those European girls are a bit of a different breed.

What the hell does the 1st season of the Dog Whisperer DVD (which is an awesome show/tutorual btw) have to do with the rest of your 'nekkid driving' mods???:confused1 :confused1
 
#7,318 ·
Drifting02WRX said:
well i WAS planning on having kids... but a quick 50whp is SOOO much better!!
I like the way you think. :thumbup:
Kids are overrated and expensive anyway. :rotfl:
 
#7,322 ·
Dog Whisperer DVD box set is key...

......If you drive naked the REALLY BAD DOGS(leg humpers) seem to come out of the woodwork-therefore a little knowledge on controlling them comes i handy. Especially in Norway where it is legal for women to drive NAKED. In fact you'll find most everywhere in Scandinavia women are encouraged to drive au' naturel. Of cours it is forbidden for men to do so.:p :p
mike05STi said:
+1

Yeah, those European girls are a bit of a different breed.

What the hell does the 1st season of the Dog Whisperer DVD (which is an awesome show/tutorual btw) have to do with the rest of your 'nekkid driving' mods???:confused1 :confused1
 
#7,325 ·
I am sure it is aerodynamic if your completely shaved but it really only applies to crotch rockets. So men don't need duct tape. :rolleyes: We just need pain killers or a very comfortable seat. Preferably made from that temperpedic memory foam as it doesn't transfer motion apparently which is needed for those nasty bumps in the road not transfering that motion to that specific area..........
 
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