Bov Help

[amilliems6]

which bov are you guys running?


which would you prefer because im in the process of gettin a cobb sri, su engine mount with solid shifter spacers and a bov but undecided which 1

i dont want one that makes a lot of sound or a rice type of sound..

so let me know what you guys have or what you would prefer.

dont flame this thread please

[Sifu]

You won't get a lot of flame, but you will likely get lots of different opinions. Sound is always going to be a matter of personal taste and opinion. I run the HKS. I think it sounds great. Others will say they hate it and like the sound of theirs. I think just about any of the aftermarket pieces are going to sound louder than stock, even in recirc (which is recommended, especially if you are looking for LESS sound).

Personally, I think the focus should be on quality of the part, and that it performs its intended function well. Search up on the different BOVs on the forum and see what others say. In the end, you will not really know until you slap it on for yourself and try it out, unless you can hit up a meet with lots of other drivers and hear their cars in person. Just my .02

[coyfish]

Well first of all make sure you know the difference between a BOV and a BPV. These cars are designed to use BPV's and the car will run better that way. As far as aftermarket BOV's are conscerned, most will work fine. Just stay away from ebay noname brands.

The forge bpv is very popular, works great, and is cheap but it is noisy when your in boost. Has a distinct "ping" sword clashing sound.

I would just go on youtube and hear the different BOV's in recirculation mode.

HKS SSQV BOV
Forge bpv
Greddy type rs
Turbosmart

Aftermarket BOV's will make more noise than the stocker. HKS is a quality piece (although expensive) and sounds subtle and "classy" (if that makes sense) in both VTA / recirc modes.

[amilliems6]

thanks for your opinion guys..

ive been looking at the HKS Universal Super Sequential BOV SSQV from SU and it 200$ so not bad...

[wh1te0nr1ce]

pick up a turbosmart used from someone. ull love it

[Super Shredder]

the forge is a stock oem metal replacement more or less, it makes whatever sounds the stock bpv makes, but like coy said, instead of plastic snaping together, you hear a metal 'sword clashing' sound. it is overwhelming inside the car sometimes. it is high quality, and is tunable with many different mods.

the hks ssq is a high quality and respected brand peice. it is very up to date on build and technological advancement in turbocharging, BUT it sounds the absolute riciest of the bunch because it is a unniversal build attached to a MS6 bolt on kit so it goes on Eclipses and Civics just the same with a different bolt on kit. swooooosh tweet, swoooosh tweet, or in recirc you get a sped up turkey call.

turbosmart is the highest quality, most expensive, and most designed specifically for the MS6. although it is also a universal build with a bolt on kit attached, it comes in large size if you dont mind making small cuts to the intercooler shroud (worked fine for some) or you have a FMIC, or it comes in compact size and fits perfectly (no difference in performance). It is a half and half BOV and BPV, It sounds the most normal and indescript of all the choices, you hear a crisp metal "PASH" much like a commercial truck. it is also very easily tunable. and its pretty bulletproof.

these are the top 3 choices i'd say. anything else you may be taking risks. even these, you are taking risks. the stock bpv works, and once you have an intake, you can hear it very well, and it is not ILLEGAL.

[Dr. D]

the forge sounds a bit different then the stock one but i would suggest the synapse valve.

[wannabe]

i love the ZING from the forge :) but thats just me.

[amilliems6]

lol so many different opinions.

any one got videos of their or anything?

[coyfish]

youtube them

[its_me]

+1 for HKS recirc

[ms6acton]

+1 forge

[silver_speed6]

As long as you don't punch it, the Forge BPV can be completely silent.

[Dr. D]

i hear mine just about ALL the time... driving in boost and vac

[amilliems6]

oh well.. see thats the thing. i dont kno much about bov well i do but just never experienced one myself since this is my first car. I just dont want the annoying riced out bov that make sound everytime u switch gear..

you guys kno what i mean?.. i am looking at the hks ssqv though

[ms6acton]

with the hks as long as you keep it out fo boost while u shift u wont hear anything. .and it has a beautiful sound when u do want it (:

[amilliems6]

with the hks as long as you keep it out fo boost while u shift u wont hear anything. .and it has a beautiful sound when u do want it (:

u talkin bout the hks ssqv?

[ms6acton]

yes sir

[amilliems6]

yes sir

hm ok thanks (shady)

[tunersteve]

Go with a black Forge. Stealth and easy install, and one of the cheaper options.

In my opinion, a BPV is far from rice. The part does actually give it a performance gain, and the sound is just a byproduct.

[amilliems6]

will be gettin a cobb sri pretty soon so im debating if the bov is a must or if that can hold off until later when i get more mods

[ms6acton]

will be gettin a cobb sri pretty soon so im debating if the bov is a must or if that can hold off until later when i get more mods

if your stock bpv is not holding boost then replace it. if its holding fine there's no rush

[amilliems6]

how would i know though? because i dont have a boost gauge

[coyfish]

you dont know unless you have a boost gauge (unless your leaking like crazy which is very rare).

The OP said he didn't want a loud BPV and I think the forge has the most noticable noise out of any of them. All the valves are quiet under boost but the forge is definately noticable once your moving. Love or hate the noise, regardless its a solid product.

[amilliems6]

yea it would be pretty nice to get some heads turning with hks ssqv

[ms6acton]

it sounds liek youre already sold on the hks lol

[amilliems6]

well its like 200$ lol and im not really trying to spend 300$+ on a bov and ive heard ms6 on youtube with it and its not that bad lol.

[ms6acton]

where u getting one for 200? the whole kit costs 275$ 200 is just for the bov.. you need the flange and what not

[amilliems6]

where u getting one for 200? the whole kit costs 275$ 200 is just for the bov.. you need the flange and what not

well i was going to get a used one from a friend but i think im just going to buy a new one which the whole kit is 290$

[ms6acton]

275 at protegegarage.com and its free shipping

[amilliems6]

how come theres not kit included with that one?

[ms6acton]

how come theres not kit included with that one?

there is one.. third last from the bottom
http://siteground207.com/~protegeg/index.php?cPath=34_264

[amilliems6]

right i saw it but i thought all of em were bolt ons?

[ms6acton]

nope.. hks uses that same bov for most of their applications and just use different flanges so it will line up with whatever car you have. so u want to just buy the kit so it will have everything need (:

[amilliems6]

nope.. hks uses that same bov for most of their applications and just use different flanges so it will line up with whatever car you have. so u want to just buy the kit so it will have everything need (:

lol thats gay i wish they were bolt ons but thanks for telling me before i made a mistake lol... hopefully i dont have to spend that much and some1 on here will sell me a 1g dsm bov, that be nice

[ms6acton]

did u try going over to a mitshu forum?

[amilliems6]

yea but cant find it.. found some guy on craiglist last nite but he sold it =/

[JOSER_SPEED6]

Hey Bro,

I know you probably have your mind made up alreay but have you considered the Turbo XS Hybrid BOV. Its specially designed and tuned for the MS6 and MS3. I got it on my 2006 MS6 and I love it. You really only hear it when your boosting. Its desinged so your check engine light wont turn and also wont cause your car to back fire or sputter like other BOV will. During normal driving you can hardly tell you have one but if you step on it you can definetly hear it. Its the best of both worlds and its cheap and you dont have to get a seperate flange for it. I bought mine on ebay for $220.00 (I know ebay, but its a really good quality product.

[amilliems6]

so what do you guys think about the Turbo XS Hybrid BOV

[ms6acton]

when i had my speed3 i had the turbo xs hybrid bov and it wasnt very loud unless u were in boost and it had a very nice sound. but i did notice backfire sometimes when i would go WOT

[SMOKEYS36SHOP]

ok i have a turboxs hybrid bov and after just installing my tmic and turbo inlet the thing sounds bad ass..it took that nice clean crisp sound and gave it a deeper tone...it sounds amazing...but now im having a problem and maybe you guys can help. right now in first and second gear i am holding boost at 14-15 pounds of boost and third and forth i spike at 17-17.5 and drop off and hold at 15-16...does this sound right or is this what i get for buying a 50/50 bov?

[Mistersix]

i'm runnin the forge and my peaks then falls a pound or two and holds. sound right to me.

[suffolkspeed6]

syanapse is sick and distinctive and they sell a reciurculator fitting for it if ur interessted

[Dr. D]

^ i have it and love it... (the synapse)

[SMOKEYS36SHOP]

ok and how are your boost levels? i love the sound of the turboxs hybrid...but i am worried im not boosting and holding enough...

[SubieKiller3]

dont go with the hks unless your ok dealing with all the fitment issues.

[Killer]

One month so far on a decision on what BOV to buy? (crazy)


Just get one already! (lol2)

[amilliems6]

One month so far on a decision on what BOV to buy? (crazy)


Just get one already! (lol2)

lol i kno i kno... im waiting for su to come out with theirs.. im just waiting for pics anf vids

[SMOKEYS36SHOP]

well for sound issues you can always search out bov sounds on youtube...so far there were 3 bov's that stood out with sound in my opinion...turboxs sounds like most bovs out there and in my opinion sounds just like the turbosmart one...then there is forge bpv that sounds like the mario coin...and then there is the hks which has a completely different sound of its own in my opinion very high pitched sound which i like a lot!!
http://www.youtube.com/watch?v=nW_8M-N2MCA - hks bov
http://www.youtube.com/watch?v=3576Qfjh6fc - turbosmart
http://www.youtube.com/watch?v=nCMtBtl6vkc- turbo xs hybrid bov
http://www.youtube.com/watch?v=pb-8nBVe2ME - forge bpv

[SMOKEYS36SHOP]

keep in mind that the best bov/bpv for your car is a bpv or the hybrid bov which does both...goodluck!!

[tunersteve]

keep in mind that the best bov/bpv for your car is a bpv or the hybrid bov which does both...goodluck!!

The best BPV for your car is a 100% recirc BPV. Any VTA at all will mess with the ECU unless you get it tuned out via Standback or XEDE.

[SMOKEYS36SHOP]

well tuner steve your right but i have never had ecu issues with my hybrid bov....i have had it for about 8 months now...but i agree that a bpv is the "best" for our cars

[tunersteve]

well tuner steve your right but i have never had ecu issues with my hybrid bov....i have had it for about 8 months now...but i agree that a bpv is the "best" for our cars

You may not have issues, but your car isn't running to its full potential. It expects all air that has entered the intake to be accounted for, and if you are venting some of it, you are altering that in some way. It may not be noticeable, but your ECU wasn't entirely happy.

[SMOKEYS36SHOP]

yea i know...but i love the sound of it lol...im never gonna get rid of it...but your very right when saying im prob not getting the full amount of power..i bet im out about a pound of boost from it even tho im holding 15-16 pounds in every gear ..but i plan on getting a cobb ap later on and im sure it will help fix any issues

[tunersteve]

yea i know...but i love the sound of it lol...im never gonna get rid of it...but your very right when saying im prob not getting the full amount of power..i bet im out about a pound of boost from it even tho im holding 15-16 pounds in every gear ..but i plan on getting a cobb ap later on and im sure it will help fix any issues

Currently, the AP doesn't tune for a VTA setup. I believe only the Standback and the XEDE can, but you have to have it set up for you.

[amilliems6]

yea thats why im either gunna go with the forge or the bpv that su is coming out with

[BoostedSpd6]

Currently, the AP doesn't tune for a VTA setup. I believe only the Standback and the XEDE can, but you have to have it set up for you.


well monday we should be able to tune for that ourselfs..and im sure someone will have a map anyways for it in the near term..

[amilliems6]

why monday

[tunersteve]

ATR comes out Monday. I would imagine you will see a whole new slew of maps in the next few months.

[Super Shredder]

i hope to have the first of the shipments of the new Turbosmart 100% BPV. i will take pics and video for youtube as soon as i get it.

[amilliems6]

i hope to have the first of the shipments of the new Turbosmart 100% BPV. i will take pics and video for youtube as soon as i get it.

did su tell you when you should be getting it?

and thanks for the pics and vids lol thats what i need to make my decision so i can get my money worth

[Super Shredder]

did su tell you when you should be getting it?

and thanks for the pics and vids lol thats what i need to make my decision so i can get my money worth

i was told at the end of the month i think

[ms6dj]

I was told it would be ready end of May as well, but "for a prototype"... got an email from Mark at SU today ("I hope to have a prototype in by the end of May.")

From his mention of 'prototype' rather than 'product to sell' (or something similar), sounds like it may be into June before a final product is shipped? But I'm not sure exactly what he meant by prototype (still in development vs a test of the final product). Maybe I should take a smart pill and follow up with another email. Unless anyone has heard otherwise (Super Shredder, did they mention something about end of May just being prototype to you as well)?

[Super Shredder]

i asked "when will they ship out" he said the end of the month

[amilliems6]

i asked "when will they ship out" he said the end of the month

what about clips and pics??

[Super Shredder]

nevermind everything i said, spoke to SU today they said the protoypes will be here at the end of may, and the rest will ship out next month once they get the ok, i cancelled my order for 175$ and instead bought the real Turbosmart Dual Port BOV for 160$ from this forum. even the guys at SU were like you should buy the BOV it will flow more. i couldnt wait another 2 months, its summer. now is the time to vent!

[Super Shredder]

just installed, cleaned/lubed, guestimated 1/4th inch and started up, no problems, no stalls, no backfires, sounds OUTSTANDING. this is the exact sound i could have hoped for, i was leaking SOOOOOOOOO much boost i cant beleive it. i thought it was my spark plugs (gonna replace them anyway) but its now really smooth, no shutter either during acceleration depression. I scared the crap out of an SVT F150 hot rodding around my town, we pulled to a stop light inside a tunnel, in his american flag bandana he looked at me reved up which was very very loud so i waited until the resonance was gone, did one big VEEERRPASH! and this guy flinched sooooo classically. ultimately making my purchase worth it all. i made my left, he went straight, i drove away with an ear to ear smile. wont have any heavy driving impressions until the ECU learns how to live again. gimmie 2 days.

[amilliems6]

lets see some clips and pics

preferably clips

[Blendercloud]

just installed, cleaned/lubed, guestimated 1/4th inch and started up, no problems, no stalls, no backfires, sounds OUTSTANDING. this is the exact sound i could have hoped for, i was leaking SOOOOOOOOO much boost i cant beleive it. i thought it was my spark plugs (gonna replace them anyway) but its now really smooth, no shutter either during acceleration depression. I scared the crap out of an SVT F150 hot rodding around my town, we pulled to a stop light inside a tunnel, in his american flag bandana he looked at me reved up which was very very loud so i waited until the resonance was gone, did one big VEEERRPASH! and this guy flinched sooooo classically. ultimately making my purchase worth it all. i made my left, he went straight, i drove away with an ear to ear smile. wont have any heavy driving impressions until the ECU learns how to live again. gimmie 2 days.

Sound clip please! (yippy)

[amilliems6]

i actually just found a video.. this could be helpful to some people

http://www.youtube.com/watch?v=bq9RuEPJ8Ic&feature=related

[MS3 GT]

highly recommented HKS SSQV or SYNAPSE...THE BEST BOV ON THE MARKET NOW!!!

[amilliems6]

are you too busy enjoying ur new BOV that u cant come in here and post pics/clips and tease us(sad2)

[Super Shredder]

haha im at 98 miles and its raining so no chance to rip it and no place to take out the camera yet, but it is very satisfying to not hear boost leak overpowering the delicious turbo noises. im talkin boost leak at 3100rpm too, my stocker was a peice of dook. pics will be coming within the next sunny day, and video/sound will be when i can get one of my friends who can film to take some footage.

[tunersteve]

Are you positive your stock valve was leaking? Did you perform the pen test and see?

[Super Shredder]

i mean what else could explain it, i reused all hoses and stock clamps, and experience absolutely no loss of power at any time anymore.

[tunersteve]

Were you able to quantitatively measure a loss of boost on a DH or AP?

I'm just trying to say there are a lot of reasons why you'd lose boost. One of the most common areas is the connection between the inlet and the turbo itself. When installing my TIP, the stock inlet literally fell off.

[Super Shredder]

nope no guages or tests, i only replaced one part, and all the problems i was experiencing dissapeared, so i cant say for sure, but i had an idea for a while, and it ended up fixing it within one test drive. didnt touch the inlet or intake.

[tunersteve]

I know a lot of people will swap out BPVs for new ones from stock, but the point is, it's not always a problem. If you're seeing boost leaks on a logging device, I'd consider it. I've known members with other MS6s and MS3s who have went back to the stock BPV because there was no issue, and validated it's function via a DH or AP.

Definitely take the time to check your inlet connection, as well as the intake--> inlet connection as well.

[Super Shredder]

after 40k miles with the stock peice i can honestly say i will never go back to stock. this turbosmart works pretty outstanding.

[amilliems6]

Super Shredder where are he pics and clips man its been like a week

[Super Shredder]

haha the day i reached 99miles i had a blowout on the highway and i shredded the lug key taking the rim off. i just got the car back two hours ago with an alignment, oil change, and new kuhmos for summer, i gotta teach my girlfriend how to not suck at filming things so gimmie a couple more, i also have to edit training videos for my dog so im a little swamped. she has her first competition in 4 days. also i found a very big dealer in north nj that doesnt care about mods!

[MS6 4 Lyfe]

does everyone run it in recirc? or how will your car run if u run it in vta? with the recirc hose blocked off

[Marauder.45]

Excuse my noob-ness. All my previous cars have been NA.

Why would I want to let air out? Wouldn't keeping it all in the system be "better" than letting any air out?

Is the Forge BPV a recirc? Wouldn't recirc be best for not losing anything? I had planned on adding this with a downpipe and tip. Does this part not impart any performance gain unless your OE part is leaking?


This thread made me confused. (uhm)

[tunersteve]

Our cars are designed to run in 100% recirc. You can run it in VTA, but it will not run correctly without some sort of tuning to make it accomodate the release of air.

The Forge is 100% recirc. There are hybrid valves out there, as well as full 100% VTA ones. Your best bet is to keep it as close to stock in design as possible IMO.

One last bit of advice. Check your stock valve for leaks by doing the pen test:

-take your thumb and cover the small opening at the top of the valve. With a pen, push the piston up and release. The valve should hold the piston if you are holding boost tightly. If not, you may have a leaky BPV.

Ultimately, our engines are a vast combination of parts that work together, and I hate to blame the BPV as a problem for everyone.

[Blendercloud]

does everyone run it in recirc? or how will your car run if u run it in vta? with the recirc hose blocked off

I run a Forge BPV, Blue spring + 2 shims. I like my Forge so far.

[Super Shredder]

i run dual port or "hybrid" which means it recirculates and sometimes it vents to atmosphere, i beleive when it VTAs it also recirculates air anyway to keep a/f ratios correct. IMO Turbosmart has the most unique and unannoying sound, (sorry sword clash/mario coin forge guys). its definitely the most un-rice of the bunch. car runs fantastic.

[Killer]

just wondering if anyone has tried this BOV from PG

http://siteground207.com/~protegeg/product_info.php?cPath=34_264&products_id=1638

[tunersteve]

I was just gonna redirect you to the other page, but it got closed. LOL.

[kylefire5]

I would also like some info on the Type S BOV

[amilliems6]

I would also like some info on the Type S BOV

yea so does any1 know anything about this?

[ms6bb0y]

also i found a very big dealer in north nj that doesnt care about mods!


sorry to thread jack, but which dealer are you referring to?

haven't had any issues yet [knock on wood] .... but i would love to avoid the hassle of finding a good mazdaspeed authorized dealer in nj that is more accepting of mods. especially since im down south and closest one is in toms river [45 mins].

[boost2dms6]

I'm a newb to turbos and am slowly learning about them. But running the bpv or bov recirculated doesn't give you the sound that vta does right?

[Mistersix]

right, its quieter. but you'll still get plenty of BPV goodness in recirc!

given you have an aftermarket intake of some type.

[amilliems6]

right, its quieter. but you'll still get plenty of BPV goodness in recirc!

given you have an aftermarket intake of some type.

i wish it did though (sad2)

[boost2dms6]

Okay so by VTA you lose some boost 1-2 psi? But by doing it recirc. you hold boost 100%..

I think I'm starting to understand haha..

My old roommate, I think is on here, has a MS3 that I used to help him work on so I know a little bit about said things but not much since I've never been around or owned a turbo'd car before.

[amilliems6]

Okay so by VTA you lose some boost 1-2 psi? But by doing it recirc. you hold boost 100%..

I think I'm starting to understand haha..

My old roommate, I think is on here, has a MS3 that I used to help him work on so I know a little bit about said things but not much since I've never been around or owned a turbo'd car before.

our cars are made to run recirc.. so if you run VTA it runs like shit and back fires

[boost2dms6]

ok got you

[Blendercloud]

You don't lose boost going vta. You mess with the AFR's by not recirculating air that the ECU thinks it's going to get.

[Super Shredder]

during the VTA you are bound to get backfire because of what Blender said about the ECU, it will add extra fuel to the mix to aid in cooling, so you run rich unless you get the tuning to go with it.

[USAFVMI08]

I'm running a Forge BPV. Yellow spring+ 2 shims. Definitely improved the driveability of my car and the sound isn't bad either :). Doesn't sound like a terrible clanging sound, yet. Haven't installed my SRI yet. I will say that even though it is quiet, it DOES get the attention of other people on the street that might be next to me when I shift or let off the gas. I had two people think I was trying to race them tonight. Sorry dude, just accelerating like I normally would away from a light... :p

[Qwik6]

Its hit or miss I guess. I ran my car for a few days VTA and didnt like it all that much. Best setup is recirc obviously. Wish somebody would come out with a blow through maf. Meaning you can have your bov before the maf and wouldnt make a difference since its reading exactly what air is going into the engine close to the throttle body.

[USAFVMI08]

So, if you do VTA with the Forge BPV, I'm guessing you have to plug the hose that goes into the inlet pipe, correct?

[Qwik6]

Yup

[ms6acton]

i was going to argue some points but i just dont care that much. all im going to say is thank you for spacing everything out. it made it much easier to read (:

[Blendercloud]

Everyone on the internet should know that hitting the keys harder does not make you more correct. You guys need to cool it. Everyone is going to have their own opinion.

This community is meant for constructive criticism and mature, healthy debate. If you want to be a part of it you need to be civil or just ignore one another.

We're all fans of the same platform so we all have at least that in common. Work together to learn from each other and find solutions to one another's problems. Not everyone is going to agree every time. There will always be people who do their own thing. There's no use bitching at one another.

Help the community and its members grow. Don't push them away by subjecting them to this bullshit.

[ms6acton]

like my mom always said.. if u dont have something nice to say, dont say anything at all lol

[coyfish]

Who cares, its your car ! If I had a VTA bov available I would experiment with VTA too.

[patty AT forge]

So, if you do VTA with the Forge BPV, I'm guessing you have to plug the hose that goes into the inlet pipe, correct?

You can't use the FMDVMAZ3 as a vent to atmosphere valve. It is a single piston unit and will be open pretty much whenever the manifold is in vacuum and this will cause a huge leak. We make a separate vent to atmosphere valve the FMDVMAZ301 that has a secondary piston that stays closed to prevent leaking. But you are correct about plugging the recir tube, we include a billet plug with the VTA valve.

[tunersteve]

Guys, this is getting out of hand. VTA or recirc, it doesn't matter. This thread is closed until it can be cleaned up.

[Killer]

OK..I have cleaned this up. Try to act like adults from here on out or infractions will be given. Opening thread.


Thanks.

[Jonota]

Are you positive your stock valve was leaking? Did you perform the pen test and see?

What is this pen test you speak of.... would like to verify mine leaks.

[illeztimportz]

hey folks. sorry noob here. but im still so confused about this whole bov/bpv thing. would it be a problem to just purchase an aftermarket bov/bpv (hks, turbosmart, forge ms, etc) and install onto a stock motor? i hear that if you do this the car would be harder to drive? ie: stalling?

[Jonota]

You may have issues with a "blow off valve", other wise known as VTA or vent to atmosphere. The cause of the problem is the air that is "blown off" has been counted by the mass air sensor, and fueling will expect it to be used. This will cause the computer to have issues properly controlling the fueling. If you connect the BOV input back to the turbo inlet, then you have "made" a BPV or "bypass valve", otherwise known as a recirculation valve. This ensures all the air that enters the system is counted and used in the engine. hope that helps clear it up.

Jon

[SamNavy]

With a modern fuel injected engine, the ECU (engine computer) calculates the amount of air entering the engine through the MAF/MAS/AFM/etc... (Mass Airflow Sensor) as the main variable for metering fuel.

More air entering = more fuel needed.

In the MS6, air passes through the filter, then the MAF, then to the turbo, then to the intake manifold. The OEM BPV (as in any turbocharged car) is placed between the turbo and the intake manifold. Yes, the intercooler is in there too, but the important part is that the BPV is placed on the "charged" pipe, or the pipe with boost in it. The intake pipe that is between the MAF and the turbo is not "charged" as air in there hasn't been through the turbo yet.

When you VTA (Vent to Air) using a BOV (Blowoff Valve), a large amount of air that has been through the MAF (fuel already added for) gets dumped into the engine bay causing an immediate extreme rich condition every time the BOV vents. Rich causes poor running, stumbling, bad spool recovery, etc...

When you RECIRC (recirulate the air from the "charged" pipe to the intake pipe) using a BPV (Bypass Valve), the compressed air after the turbocharger is rerouted back BEFORE the turbocharger... but after the MAF... so no air is lost and the already added fuel can mix properly.

What causes the BOV/BPV to open? A vaccum line is connected to the unit which is plugged into the intake manifold. When the driver lifts-throttle or shifts, the throttle plate closes. Now the engine is trying to suck air past the throttle plate rather than allowing the turbocharger to force air past it. This is called "vaccum". But the turbocharger hasn't completely spooled down and is still trying to force boost past the closed throttle plate... so you want to let that air out. You want to let the air out because when that boosted air slams into a closed throttle plate, a huge amount of pressure is created... enough pressure to actually break the rotating assembly of the turbocharger (that's spinning at 100,000rpm). The vaccum in the intake manifold sucks the piston in the BPV open through the line connected to it. As soon as you open the throttle again and the vaccum is reduced, the spring in the BPV closes the valve again and seals the system... and boost actually holds the valve closed, so it shouldn't leak.

So, you vent that air... either into the engine bay, or back into the intake piping after the MAF.

Stock OEM BPV's are designed to hold a specific amount of boost and respond a specific way in vaccum-to-boost transitions for the specific characteristics of that engine in that vehicle. Replacing one that performs differently than stock (hold more boost, vent faster, leak in vaccum, leak under boost) will yield predictable results.

Recent research has shown that it's very unlikely the MS6 OEM BPV leaks under boost... and that it actually responds very fast during when it actuates. Some of the smarter people in the MS6/MS3 community say the OEM BPV is the best overall performing BPV when talking about how much the stock ECU likes it... but it doesn't have that super-cool penis enlarging sound.

A happy medium to get the cool sound and keep the OEM ECU happy is one of the dual-port valves that VTA's some air, and RECIRC's the rest.

Yes, it is perfectly fine to run a BPV with an otherwise completely stock engine... the Forge piece is a direct bolt-on, and when tuned right should work better than stock. Most people running a dual-port valve on an otherwise stock engine will say they have no problems. Some people running VTA on a stock engine will tell you it works fine, but won't let anybody else drive their car.

[boost2dms6]

I think that your post SamNavy is very informative to people that know little about boosted cars and how they work.. Finally a educational post instead of an opinion..

[lakedude90]

i would have to agree. i knew a lil about turbos and BOV/BPVs nut this is ver helpful. deff gonna keep all this in mind

[Blendercloud]

SamNavy,

Thanks for serving! (Former US Marine here)

While I agree with 99% of your post, I feel that you left out something important to note about the stock BPV. It should be noted that under high levels of boost (18psi or more) after prolonged use the plastic flange can very easily bend up off the seat allowing boosted air to escape. This plastic material is not ideal for high-heat applications either (it's just cheaper).

[Mistersix]

nice first post samnavy! me, and my wife and baby appreciate those who serve and protect this county....thank you!!!!

i'd like to add that the turbosmart dual port- though awesome sounding it is-does leave you with some backfires. i've found it impossible to adjust it out. granted it only does it once or twice whenever i drive.

i recently put the stock valve back on, and been driving for a week now on it. and i must agree with some others that it does feel like it runs better. especially on/off part throttle stuff.
i notice using the cruise control to accelerate is smoother. and not jerky.

so i may just stick with the stock bpv. though i miss the fantastic whip crack of the dual port. might just post it up fs. real soon.

[boost2dms6]

Anybody have a review of the SU Turbosmart BPV? Not the dual port one but the full recirc. one..

[tunersteve]

Anybody have a review of the SU Turbosmart BPV? Not the dual port one but the full recirc. one..

One of our local guys just picked up one from SU, I'm waiting to check it out soon.

[boost2dms6]

I'm thinking about pulling the trigger on one soon but wanted to hear a review first.

[tunersteve]

I'm thinking about pulling the trigger on one soon but wanted to hear a review first.

So far he's said it's a very straightforward design and easy to install (like the Forge). I would have easily ordered one if I didn't buy my Forge.

[boost2dms6]

I read somewhere that it required some maintenance with lubrication or something.. I am not famliar really with this.. Is this true or false?

[coyfish]

Most bov's require lubrication.

[illeztimportz]

yes Jonota and Samnavy, thank you both for the informative posts. now its clear and understanding to me haha.