Blow Off Valve FAQ: Read if you are thinking of buying one! - Page 4

i_c_the_light · 12-28-2006, 02:06 AM

For teh aftArf1r3 p0p!!!

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+WRX+ · 12-28-2006, 07:14 AM

Quote:

Originally Posted by JMK508

WOW i wonder what it will look like. Anyway guys.......what is the reason everyone wants a blowoff valve. pssssssssssssssssssschaaaaaaaa. That's all it does. Sure it sounds cool for like the first 10 seconds and then it makes your car run like 1984 Geo Metro. Not good. So why does everyone feel the need to throw one on a stock car. WHY

I reallllyy like that sound =X...
And i think it's worth the money...
The only problem is as said....The confusion with the fuel system =\...Darn...

Foxy · 01-07-2007, 01:08 AM

Quote:

My thanks to Dan of Mach V Motorsports for writing an excellent BOV article that provided a lot of the information contained within this FAQ. He also provided additional information that was helpful in the formulation of this FAQ.

The link to "excellent BOV article" is dead.

Unabomber · 01-07-2007, 01:22 AM

Quote:

Originally Posted by Foxy

The link to "excellent BOV article" is dead.

It's not now thanks to the web archive. Thanks for letting me know.

WRX Josh · 01-07-2007, 03:27 AM

Awesome thread. I learned a lot. I used to be one of the people that figured a BOV would be a good mod for not only sound, but performance. I actually did some searching on this site and learned about the BOVs causing cars to run rich, but this thread really put it all out on the table.

I'm a noob btw and I already love this site.

ED_04WRX · 02-28-2007, 02:43 AM

I had the GFB hybrid set to 50/50, it was nice but I rather have a good running car. So the stock one is back on now. Besides I now have a cat back exhaust so I couldn't even hear the BOV.

Thanks for the great thread, it was very helpful.

BugeyedMonster · 02-28-2007, 03:44 AM

I really hate to dredge up an old thread like this, but i figure it's less likely to invite flame-age than opening a new thread (ESPECIALLY a BOV thread) would.

Am I understanding the above issue with the turbosmart dual-port correctly? It sounds like it vents as much as it safely can to atmos, and then recircs the rest of it....Is this anything like the Perrin BOV or others that allow you to adjust the amt of recirc vs. vented pressure? I adore that sound, but running rich FTL....

Quote:

Originally Posted by HoratioCaine

They make and sell a metric ton of throttle body spacers for fuel injected vehicles that do not one bit of good at all

As a side note, thanks for this. I've been wondering for some time just what in the hell these things help with. And now I know. Hooray for knowledgeable ppls.

jordanb1313 · 03-04-2007, 09:49 PM

Just curious, what is the .16 cent mod to make it louder?

Force · 03-04-2007, 09:52 PM

Quote:

Originally Posted by jordanb1313

Just curious, what is the .16 cent mod to make it louder?

It`s called "Crushing" the bpv...it pretty much tightens the spring to hold more boost and has a louder whoosh sound.

Greekti · 03-04-2007, 10:01 PM

very helpful thank you

jordanb1313 · 03-04-2007, 10:06 PM

Is it worth doing?

Force · 03-04-2007, 10:08 PM

^^Yes, if you are pushing some high boost numbers and want to keep your car running smoothly and stealthy for the cheapest price.

If you are running stock or a little above stock boost, the mod is not necessary.

scubiesnacks19 · 03-05-2007, 12:34 AM

is there an adjustment bolt on BOVs to adjust the "sensitivity"?

Force · 03-05-2007, 11:47 AM

Quote:

Originally Posted by scubiesnacks19

is there an adjustment bolt on BOVs to adjust the "sensitivity"?

Yes, some have a bolt and some others like the Turbosmart one can be hand-tightened to stiffen the spring to hold more boost.

Knightmare69 · 03-05-2007, 12:03 PM

It's probably been said before but I'm just here to reinforce it, first mod I did was remove the stock snorkel, heard the BPV slightly better, then I installed a drop in K&N Panel and heard it ever so slightly more, then this past weekend I just installed a used K&N Typhoon and yes, you can def. hear everything better. That should fullfill your need of Phooosh sounds. Frankly I'm glad I didn't get a BOV cuz even my gf was like a BOV would get annoying after a while as the BPV was more then enough.

Although I've always wondered if the Forge BPV was louder then stock, I emailed Forge about that but never got a response. If someone could just let me, I might get one.

jordanb1313 · 03-05-2007, 04:12 PM

Is there a tutorial on how to do that?

Knightmare69 · 03-05-2007, 04:51 PM

Quote:

Originally Posted by jordanb1313

Is there a tutorial on how to do that?

Do what?

Force · 03-05-2007, 04:53 PM

^^I think he wants to know how to crush the stock bpv

jordanb1313 · 03-05-2007, 04:57 PM

No actually to remove the stock snorkle and stuff. I was reading on taking the intake silencer out and stuff. is that all the same?

Force · 03-05-2007, 05:02 PM

Quote:

Originally Posted by jordanb1313

No actually to remove the stock snorkle and stuff. I was reading on taking the intake silencer out and stuff. is that all the same?

Yes, the intake silencer is called the 'snorkel' or 'snorkus'. It's pretty straightforward, try searching scoobymods for the write-up.

It took me about 15 minutes to do...the hardest part is pulling that sucker out from underneath the car without cutting your fingers up against the fender

But really though....it's about a Level 1 out of 10 difficulty job.

Knightmare69 · 03-05-2007, 05:09 PM

^^Yup, just unscrew the fender lining on the passenger side and peel it back, you'll see a giant odd shaped looking thing.

On the inside of the engine bay where the intake box is, you'll see a bolt that holds the snorkel, I think there may be another bolt or 2 in the fender area but I don't remember as this was the first thing I did when I got my car, had my gf shaking her head at me asking "can't you at least wait the year till your warranty expires before you start ripping your car apart?"

I just looked at her and she was like "oh screw it, I forgot for a moment I'm talking to a total car modding idiot"

Hairboy123 · 03-20-2007, 07:47 PM

I installed the GReddy blow off valve (a hybrid) because I had read that the stock BOV starts leaking after 14psi and with the Cobb AP reflash I'm boosting about 18psi. I believe the BOV is recirculating the air so as not to mess up the sensor reading. but I was noticing that when pushing the car that inbetween shifts the turbo looses pressure too quickly and it takes a sec. to boost again. I can't hear the BOV, presumably because I'm not venting to the atmosphere as well as I probably woundn't be able to hear it over the 3" exaust anyways.

2 questions:

Is the turbo not staying in boost inbetween gears an issue of the blow off valve setting or is there some other cause?

Is there a way to tell if the BOV is recirculating all the air or is doing the 50/50 thing? (since one of my friends put it on, I don't recal the initial configuration)

Take it easy on me, I know I'm a newbe and new to working on my car.

patty AT forge · 03-21-2007, 09:18 AM

Quote:

Originally Posted by Knightmare69

It's probably been said before but I'm just here to reinforce it, first mod I did was remove the stock snorkel, heard the BPV slightly better, then I installed a drop in K&N Panel and heard it ever so slightly more, then this past weekend I just installed a used K&N Typhoon and yes, you can def. hear everything better. That should fullfill your need of Phooosh sounds. Frankly I'm glad I didn't get a BOV cuz even my gf was like a BOV would get annoying after a while as the BPV was more then enough.

Although I've always wondered if the Forge BPV was louder then stock, I emailed Forge about that but never got a response. If someone could just let me, I might get one.

What email did you send it to, do you remember?

Anyways, the BPV will be a slight bit louder than stock but not by much. The tone of the sound and duration can change depending on what spring you use in the valve.

i_c_the_light · 04-02-2007, 02:21 AM

I'm throwing one on my GT and having run one before, I have experienced no issues at all as long as the spring is tightened correctly and you don't mind the odd fireball.

Oh and the stock JDM valves DO LEAK.

porTURBOer · 07-25-2007, 08:22 PM

Speaking from a true soobie noobie, thank you all for your information in this thread!

About an hour ago (when i started to read this thread), i was BOV/BPV-stupid. Now I know what NOT to do to my WRX.

Thanks again!

03-05-2007, 12:03 PM	#90
Knightmare69 Scooby Specialist Member#: 25039 Join Date: Sep 2002 Chapter/Region: Tri-State Location: Hong Kong/Dong Guan China Vehicle: 2005 CGM Stage 2 WRX SQC 275	It's probably been said before but I'm just here to reinforce it, first mod I did was remove the stock snorkel, heard the BPV slightly better, then I installed a drop in K&N Panel and heard it ever so slightly more, then this past weekend I just installed a used K&N Typhoon and yes, you can def. hear everything better. That should fullfill your need of Phooosh sounds. Frankly I'm glad I didn't get a BOV cuz even my gf was like a BOV would get annoying after a while as the BPV was more then enough. Although I've always wondered if the Forge BPV was louder then stock, I emailed Forge about that but never got a response. If someone could just let me, I might get one. Last edited by Knightmare69; 03-05-2007 at 04:51 PM.

03-20-2007, 07:47 PM	#97
Hairboy123 Scooby Newbie Member#: 127403 Join Date: Sep 2006 Chapter/Region: NWIC Location: Seattle, WA Vehicle: 2006 Impreza STI Black	probably a stupid question but... I installed the GReddy blow off valve (a hybrid) because I had read that the stock BOV starts leaking after 14psi and with the Cobb AP reflash I'm boosting about 18psi. I believe the BOV is recirculating the air so as not to mess up the sensor reading. but I was noticing that when pushing the car that inbetween shifts the turbo looses pressure too quickly and it takes a sec. to boost again. I can't hear the BOV, presumably because I'm not venting to the atmosphere as well as I probably woundn't be able to hear it over the 3" exaust anyways. 2 questions: Is the turbo not staying in boost inbetween gears an issue of the blow off valve setting or is there some other cause? Is there a way to tell if the BOV is recirculating all the air or is doing the 50/50 thing? (since one of my friends put it on, I don't recal the initial configuration) Take it easy on me, I know I'm a newbe and new to working on my car.

07-25-2007, 08:22 PM	#100
porTURBOer Scooby Newbie Member#: 145657 Join Date: Apr 2007	thank you Speaking from a true soobie noobie, thank you all for your information in this thread! About an hour ago (when i started to read this thread), i was BOV/BPV-stupid. Now I know what NOT to do to my WRX. Thanks again!

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12-28-2006, 02:06 AM	#76
i_c_the_light Scooby Guru Member#: 88618 Join Date: Jun 2005 Chapter/Region: SCIC Location: New Zealand Vehicle: 1994 Legacy "The Silver Slug"	For teh aftArf1r3 p0p!!! * Registered users of the site do not see these ads.

01-07-2007, 03:27 AM	#80
WRX Josh Scooby Newbie Member#: 136198 Join Date: Dec 2006	Awesome thread. I learned a lot. I used to be one of the people that figured a BOV would be a good mod for not only sound, but performance. I actually did some searching on this site and learned about the BOVs causing cars to run rich, but this thread really put it all out on the table. I'm a noob btw and I already love this site.

02-28-2007, 02:43 AM	#81
ED_04WRX Scooby Newbie Member#: 39215 Join Date: Jul 2003 Location: Northern NJ	I had the GFB hybrid set to 50/50, it was nice but I rather have a good running car. So the stock one is back on now. Besides I now have a cat back exhaust so I couldn't even hear the BOV. Thanks for the great thread, it was very helpful.

03-04-2007, 09:49 PM	#83
jordanb1313 Scooby Newbie Member#: 141616 Join Date: Feb 2007	Just curious, what is the .16 cent mod to make it louder?

03-04-2007, 10:01 PM	#85
Greekti Scooby Newbie Member#: 135018 Join Date: Dec 2006	very helpful thank you

03-04-2007, 10:06 PM	#86
jordanb1313 Scooby Newbie Member#: 141616 Join Date: Feb 2007	Is it worth doing?

03-04-2007, 10:08 PM	#87
Force Scooby Specialist Member#: 123515 Join Date: Aug 2006 Location: park ridge, Illinois Vehicle: 2005 vette c6 z51 LeMans Blue	^^Yes, if you are pushing some high boost numbers and want to keep your car running smoothly and stealthy for the cheapest price. If you are running stock or a little above stock boost, the mod is not necessary.

03-05-2007, 12:34 AM	#88
scubiesnacks19 Scooby Newbie Member#: 109339 Join Date: Mar 2006 Chapter/Region: TXIC Location: ATX, Plano Vehicle: 07 WRX Wagon Stg1 RIP wherever you may be..	is there an adjustment bolt on BOVs to adjust the "sensitivity"?

03-05-2007, 04:12 PM	#91
jordanb1313 Scooby Newbie Member#: 141616 Join Date: Feb 2007	Is there a tutorial on how to do that?

03-05-2007, 04:53 PM	#93
Force Scooby Specialist Member#: 123515 Join Date: Aug 2006 Location: park ridge, Illinois Vehicle: 2005 vette c6 z51 LeMans Blue	^^I think he wants to know how to crush the stock bpv

03-05-2007, 04:57 PM	#94
jordanb1313 Scooby Newbie Member#: 141616 Join Date: Feb 2007	No actually to remove the stock snorkle and stuff. I was reading on taking the intake silencer out and stuff. is that all the same?

03-05-2007, 05:09 PM	#96
Knightmare69 Scooby Specialist Member#: 25039 Join Date: Sep 2002 Chapter/Region: Tri-State Location: Hong Kong/Dong Guan China Vehicle: 2005 CGM Stage 2 WRX SQC 275	^^Yup, just unscrew the fender lining on the passenger side and peel it back, you'll see a giant odd shaped looking thing. On the inside of the engine bay where the intake box is, you'll see a bolt that holds the snorkel, I think there may be another bolt or 2 in the fender area but I don't remember as this was the first thing I did when I got my car, had my gf shaking her head at me asking "can't you at least wait the year till your warranty expires before you start ripping your car apart?" I just looked at her and she was like "oh screw it, I forgot for a moment I'm talking to a total car modding idiot"

04-02-2007, 02:21 AM	#99
i_c_the_light Scooby Guru Member#: 88618 Join Date: Jun 2005 Chapter/Region: SCIC Location: New Zealand Vehicle: 1994 Legacy "The Silver Slug"	I'm throwing one on my GT and having run one before, I have experienced no issues at all as long as the spring is tightened correctly and you don't mind the odd fireball. Oh and the stock JDM valves DO LEAK.