I Want A Blowoff Valve!!!

dremers · 08-14-2007, 01:45 PM

blow through set-up for the question up top^^^^^^^^^ i hear it is not cheap.

good lord how much more noise do you want? i purchased bov when alittle after i purcahsed my car and honestly i am tired of hearing that $hit. but its your car and after modding your car a quite bit more you will get tired of it. at this moment i have turbo back exhaust=loud, snorkel delete= loud, arc intake=goodness its loud. so most of the time i dont even hit boost and besides your fuel mpg will suck. oh one more thing.

when you are spooling and your bov releases all that air, your turbo stops, shift into second it takes longer for your turbo to spool resulting in you being slower and wear on your turbo.

mosc · 08-15-2007, 02:47 PM

I think people under-estimate the volume the BOV generates when the intake isn't designed to silence it. You want sound, just uncork the intake.

Kjott21 · 08-15-2007, 03:42 PM

Quote:

Originally Posted by dremers

when you are spooling and your bov releases all that air, your turbo stops, shift into second it takes longer for your turbo to spool resulting in you being slower and wear on your turbo.

Huh? Explain this to me please. This doesn't make any sense at all. The turbo doesn't stop. You are going to drop pressure anytime a BOV or BPV opens whether it is stock or not.

Kjott21 · 08-15-2007, 03:46 PM

Quote:

Originally Posted by mystilexzero

Sorry im just getting into the world of wrx's but im just wondering, For a dsm to vent their BOV they would simply buy a blow through set-up, an intake with no maf, a gm maf sensor placed inbetween the UICP and the throttle body, and finally a maf translator to tune it, however i used dsm link and zero'd out the translator. What parts would you need to safely vent your blow off valve?

The only way to run a blow through setup with our cars is to have a front mount and put your MAF sensor after the BOV. That way it will be measuring the air going into the throttle body and not just what the system is pulling in on the intake side. Perrin makes a blow through tube for their front mounts that you can buy separately.

dremers · 08-16-2007, 04:48 AM

Quote:

Originally Posted by Kjott21

Huh? Explain this to me please. This doesn't make any sense at all. The turbo doesn't stop. You are going to drop pressure anytime a BOV or BPV opens whether it is stock or not.

well i cant explain the way the original poster explained it but it makes a lot of sense. go to nasioc.> newbies> and read unibombers manifesto.

dumdum · 08-16-2007, 09:09 AM

Quote:

Originally Posted by Kjott21

Huh? Explain this to me please. This doesn't make any sense at all. The turbo doesn't stop. You are going to drop pressure anytime a BOV or BPV opens whether it is stock or not.

It doen't stop persay,it stalls.By recirculating the air will "pinwheel" the compressor wheel keeping the RPMs up on it as well as keeping the system some what pressuried.By venting to atmosphere the turbo will start to stall durring the shift and you also have to biuld up the pressure again.
http://www.spdusa.com/blow-off_valves.htm

LiL Shoaf · 08-16-2007, 07:22 PM

Dumdum and Kjott21 are correct, the turbo does NOT stop spinning, it simply slows down to dumb it down.. Setups like the Factory BPV use the pressurized air that is not needed during shifts or what ever to keep the turbo spinning at a higher rate.. Your not boosting as the air is simply in a "Loop"..

TDub · 08-23-2007, 05:00 PM

Quote:

Originally Posted by dumdum

It doen't stop persay,it stalls.By recirculating the air will "pinwheel" the compressor wheel keeping the RPMs up on it as well as keeping the system some what pressuried.By venting to atmosphere the turbo will start to stall durring the shift and you also have to biuld up the pressure again.
http://www.spdusa.com/blow-off_valves.htm

I suppose that would explain why shifting is much smother with the stock BPV installed versus the aftermarket BOV.

The stock BPV makes almost NO noise what-so-ever on my car, even with the snorkle/silencer removed. Has anyone else experienced this?

pearl_boxer · 08-23-2007, 05:11 PM

^^^
Its just the nature of the beast to not make much noise. Depending on the temperature and humidity in the air, you will hear more noise from the BPV. I find that on cooler days with more humidity I can hear the BPV quite well. Also, it depends on how much you put your foot into it before you let off to shift. More boost=more noise.

TDub · 08-23-2007, 07:57 PM

Even at WOT from 2k to around 5k?

Maybe i'll try throwin the stocker back on this weekend with the BPV and try it again. It's been a while since i've had the BPV/silencer delete combo.

mystilexzero · 08-25-2007, 12:33 AM

i was thinking, if you really want noise like i do but safely i was gonna do an SPT intake, silencer delete, and finally a GREDDY RS blow off valve with the recirculation kit, if you look at the recirc it the pipe that recirculates the air is made of metal and if i remember correctly a local dsm guy made a metal pipe that recirculatied his blow off valve from home depot and it sounded alot louder and more appealing. anyone know if it would be the same for a wrx?

Circle_Nine · 08-31-2007, 12:14 PM

If the kid wants a BOV just let him get a BOV, try it and if he likes it, he likes it, if he doesnt he doesnt.

BAMBO · 08-31-2007, 02:00 PM

I agree with Circle Nine, theres no harm in trying. In fact I have the Turbosmart Dual-port BOV on mine and it has always run fine. The nice thing about the dual-port is that its 50/50 ... meaning that it recirc 50% and blows 50% to atmosphere(not super loud, but not totally silent ... very clean sound). I found that my stock BOV was somewhat weak. Especially after we started tuning and playing with maps, we found that we were getting some blow by at around 14-15 PSI ... I think mine was ready to kick the bucket. HOWEVER .... on a totally stock setup(knowing that there really is no need for an aftermarket BOV beyond sound benefits) the BOV should realistically be able to handle anythign within the 15 PSI range. IF you want my opinion, and IF I was going to leave it stock for a while I would jsut do as most people do and remove the silencer as it gives the sounds without having to spend the money.

animl50 · 09-13-2007, 02:03 AM

if anyone wants the bov sound.....................do what i did. buy an adapter plate for the maf housing and then buy the cone filter........it should come in a kit........u get rid that ugly stock air box and have a nice intake sound and on top of that when the bov recirculates u can hear the sound through the intake.......i love it.....personal preference though.......plus its nice to hear the turbo spooling up but i hear mine spool alot more cause i have an automatic......my buddy had a stick and did the same thing i did and i could hear mine more under boost.....why i just dont know.....if anyone can answer while we are at it i would appreciate it. thanks

dremers · 09-13-2007, 04:57 AM

what i have realized from going stock to a atmospheric bov.back to stock and then to another bov is that. you will see a huge difference on the track. when that bpv is on your car your car feels/is so much quicker but that is not the point here. i ended up borrowing my buddies turbo xs-rfl and i couldnt believe how this damn thing sounded like a external wastegate. and i have been around a lot of rfls in my days and not one sounds like mine.

do what makes you happy bro. its your car.