Subaru uses a small cheap plastic compressor bypass valve. When the
throttle plate is closed (such as when you are shifting) and there is
boost trapped between the turbo and the throttle plate, it caused the
turbo to bog and when you touch the throttle again, this trapped boost
causes an unpleasant bucking and surge. I have heard this called
"trailering" because it feels amazing like what you experience when
pulling a trailer that is trying to be in control of your car. A CBV
opens when there is vacuum on the engine side of the throttle plate and
pressure on the air cleaner side. It routs the boost back to just
upstream of your turbo so the turbo keeps spinning and doesn't bog. The
need for a CBV or a BOV increases as boost increases. You can get away
without one under about 5psi, but they are absolutely essential above
10psi. When your CBV is blowing open from too much pressure, it sounds
like someone blowing across a jug. A failing CBV causes the car to
surge at high boost. I added a bigger spring to mine and glued it back
together, with mixed results.
I like to use Blow-off Valve (BOV) to describe one that dumps to
atmosphere and Compressor Bypass Valve (CBV) to describe one that routs
back upstream. Onve air has passed my Mass Airflow Sensor (MAF), then I
want it accounted for all the way out the exhaust pipe. I don't want my
ECU to get confused by "inventory shrinkage" i.e. air that was there at
the MAF, but not part of the air/fuel mixture, so I am a CBV man. They
are identical valves, just plumbed differently. In BOV mode, they make
a wierd prprprprprpr "bird call" noise when you back off. I have a
$200, big purple adjustable TURBO-XS model from Oz. The cheapest
reasonable alternative is to get one from a Diamond Star triplet
(Mitsubishi Eclipse, Talon, Laser). The old aluminum ones are slightly
better than the new plastic ones, but both are considerably more robust
than Subarus. A stock EJ20G CBV is identical to a stock EJ22T CBV.
Both are shit.
Love
Bill Robinson
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BOV
Moderators: Helpinators, Moderators
-
Matt Scicchitano
BOV
A stock EJ20G CBV is identical to a stock EJ22T CBV.
> Both are shit.
>
> Love
> Bill Robinson
Bill, at what point did you begin to have problems with your stock
valve? And was it just a case of too much boost for the stock valve,
or did something actually fail with the valve itself? Thanks.
-Matt
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> Both are shit.
>
> Love
> Bill Robinson
Bill, at what point did you begin to have problems with your stock
valve? And was it just a case of too much boost for the stock valve,
or did something actually fail with the valve itself? Thanks.
-Matt
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Subaru rulez
BOV
OK, who the hell want's to have shit on their car... just to make sure, is this my CBV on the picture? If it is, I just bought this piece of shit 6 months ago, when trying to get my car working ok... the reason then was the Air-flow meter so I inveasted my money in shit for nothing, I could at least have tried to get another CBV if I'd known this! cheers, Miguelito
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Subaru rulez
BOV
OK, who the hell want's to have shit on their car... just to make sure, is this my CBV on the picture? If it is, I just bought this piece of shit 6 months ago, when trying to get my car working ok... the reason then was the Air-flow meter so I inveasted my money in shit for nothing, I could at least have tried to get another CBV if I'd known this! cheers, Miguelito
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Matt Scicchitano
BOV
--- In BC-BFLegacyWorks@egroups.com, Subaru rulez <awdturbodude@y...>
wrote:
> OK, who the hell want's to have shit on their car... just to make
sure, is this my CBV on the picture?If it is, I just bought this
piece of shit 6 months ago, when trying to get my car working ok...
the reason then was the Air-flow meter so I inveasted my money in
shit for nothing,
Yes, that's your blow-off valve. Just out of curiousity, what is
wrong with your blow-off valve that it is such a piece of junk?
Prodrive used the identical-type blow-off valves on their 30psi+
Group A Legacys and Imprezas for years.
-Matt
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wrote:
> OK, who the hell want's to have shit on their car... just to make
sure, is this my CBV on the picture?If it is, I just bought this
piece of shit 6 months ago, when trying to get my car working ok...
the reason then was the Air-flow meter so I inveasted my money in
shit for nothing,
Yes, that's your blow-off valve. Just out of curiousity, what is
wrong with your blow-off valve that it is such a piece of junk?
Prodrive used the identical-type blow-off valves on their 30psi+
Group A Legacys and Imprezas for years.
-Matt
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awdturbodude@yahoo.com
BOV
Matt,
this relates to the same reason why it doesn't show "Miguelito" as
sender for msg #1124... I used Yahoo! email and settings where up my
ass or someting, definitely not correct anyway, cause it shows "BOV"
instead of "RE:BOV" and the msg I replied to isn't there at all...
Anyway, this was a reply to msg #1122, and from that msg I got the
impression that these valves ain't much to brag about...
cheers,
Miguelito
--- In BC-BFLegacyWorks@egroups.com, "Matt Scicchitano" <nzwrc1@s...>
wrote:
> --- In BC-BFLegacyWorks@egroups.com, Subaru rulez
<awdturbodude@y...>
> wrote:
> > OK, who the hell want's to have shit on their car... just to make
> sure, is this my CBV on the picture?If it is, I just bought this
> piece of shit 6 months ago, when trying to get my car working ok...
> the reason then was the Air-flow meter so I inveasted my money in
> shit for nothing,
>
>
> Yes, that's your blow-off valve. Just out of curiousity, what is
> wrong with your blow-off valve that it is such a piece of junk?
> Prodrive used the identical-type blow-off valves on their 30psi+
> Group A Legacys and Imprezas for years.
>
> -Matt
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this relates to the same reason why it doesn't show "Miguelito" as
sender for msg #1124... I used Yahoo! email and settings where up my
ass or someting, definitely not correct anyway, cause it shows "BOV"
instead of "RE:BOV" and the msg I replied to isn't there at all...
Anyway, this was a reply to msg #1122, and from that msg I got the
impression that these valves ain't much to brag about...
cheers,
Miguelito
--- In BC-BFLegacyWorks@egroups.com, "Matt Scicchitano" <nzwrc1@s...>
wrote:
> --- In BC-BFLegacyWorks@egroups.com, Subaru rulez
<awdturbodude@y...>
> wrote:
> > OK, who the hell want's to have shit on their car... just to make
> sure, is this my CBV on the picture?If it is, I just bought this
> piece of shit 6 months ago, when trying to get my car working ok...
> the reason then was the Air-flow meter so I inveasted my money in
> shit for nothing,
>
>
> Yes, that's your blow-off valve. Just out of curiousity, what is
> wrong with your blow-off valve that it is such a piece of junk?
> Prodrive used the identical-type blow-off valves on their 30psi+
> Group A Legacys and Imprezas for years.
>
> -Matt
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Matt Scicchitano
BOV
Sorry Miguelito. Looks like all is well now 
-Matt
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-Matt
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penty
BOV
I had one and it just went woooooosh.....gushhhhhhhh, what would be kewl though is the chirping noise you are talking about prprprprprpr "bird call" noise when you back off, how come it's such a different sound?
Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
cheero
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
E-mail : penty@nettaxi.com
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
----- Original Message -----
From: William D. Robinson <mailto:vultureboy@mindspring.com>
To: bc-bflegacyworks@egroups.com
Sent: Monday, November 27, 2000 69 PM
Subject: [BC-BFLegacyWorks] RE: BOV
Subaru uses a small cheap plastic compressor bypass valve. When the
throttle plate is closed (such as when you are shifting) and there is
boost trapped between the turbo and the throttle plate, it caused the
turbo to bog and when you touch the throttle again, this trapped boost
causes an unpleasant bucking and surge. I have heard this called
"trailering" because it feels amazing like what you experience when
pulling a trailer that is trying to be in control of your car. A CBV
opens when there is vacuum on the engine side of the throttle plate and
pressure on the air cleaner side. It routs the boost back to just
upstream of your turbo so the turbo keeps spinning and doesn't bog. The
need for a CBV or a BOV increases as boost increases. You can get away
without one under about 5psi, but they are absolutely essential above
10psi. When your CBV is blowing open from too much pressure, it sounds
like someone blowing across a jug. A failing CBV causes the car to
surge at high boost. I added a bigger spring to mine and glued it back
together, with mixed results.
I like to use Blow-off Valve (BOV) to describe one that dumps to
atmosphere and Compressor Bypass Valve (CBV) to describe one that routs
back upstream. Onve air has passed my Mass Airflow Sensor (MAF), then I
want it accounted for all the way out the exhaust pipe. I don't want my
ECU to get confused by "inventory shrinkage" i.e. air that was there at
the MAF, but not part of the air/fuel mixture, so I am a CBV man. They
are identical valves, just plumbed differently. In BOV mode, they make
a wierd prprprprprpr "bird call" noise when you back off. I have a
$200, big purple adjustable TURBO-XS model from Oz. The cheapest
reasonable alternative is to get one from a Diamond Star triplet
(Mitsubishi Eclipse, Talon, Laser). The old aluminum ones are slightly
better than the new plastic ones, but both are considerably more robust
than Subarus. A stock EJ20G CBV is identical to a stock EJ22T CBV.
Both are shit.
Love
Bill Robinson
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---------------------------------------------------------------------_->
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Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
cheero
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
E-mail : penty@nettaxi.com
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
----- Original Message -----
From: William D. Robinson <mailto:vultureboy@mindspring.com>
To: bc-bflegacyworks@egroups.com
Sent: Monday, November 27, 2000 69 PM
Subject: [BC-BFLegacyWorks] RE: BOV
Subaru uses a small cheap plastic compressor bypass valve. When the
throttle plate is closed (such as when you are shifting) and there is
boost trapped between the turbo and the throttle plate, it caused the
turbo to bog and when you touch the throttle again, this trapped boost
causes an unpleasant bucking and surge. I have heard this called
"trailering" because it feels amazing like what you experience when
pulling a trailer that is trying to be in control of your car. A CBV
opens when there is vacuum on the engine side of the throttle plate and
pressure on the air cleaner side. It routs the boost back to just
upstream of your turbo so the turbo keeps spinning and doesn't bog. The
need for a CBV or a BOV increases as boost increases. You can get away
without one under about 5psi, but they are absolutely essential above
10psi. When your CBV is blowing open from too much pressure, it sounds
like someone blowing across a jug. A failing CBV causes the car to
surge at high boost. I added a bigger spring to mine and glued it back
together, with mixed results.
I like to use Blow-off Valve (BOV) to describe one that dumps to
atmosphere and Compressor Bypass Valve (CBV) to describe one that routs
back upstream. Onve air has passed my Mass Airflow Sensor (MAF), then I
want it accounted for all the way out the exhaust pipe. I don't want my
ECU to get confused by "inventory shrinkage" i.e. air that was there at
the MAF, but not part of the air/fuel mixture, so I am a CBV man. They
are identical valves, just plumbed differently. In BOV mode, they make
a wierd prprprprprpr "bird call" noise when you back off. I have a
$200, big purple adjustable TURBO-XS model from Oz. The cheapest
reasonable alternative is to get one from a Diamond Star triplet
(Mitsubishi Eclipse, Talon, Laser). The old aluminum ones are slightly
better than the new plastic ones, but both are considerably more robust
than Subarus. A stock EJ20G CBV is identical to a stock EJ22T CBV.
Both are shit.
Love
Bill Robinson
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---------------------------------------------------------------------_->
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-
Matt Walters
BOV
At 12:16 PM 28/11/2000 +0000, you wrote:
I had one and it just went woooooosh.....gushhhhhhhh, what would be kewl though is the chirping noise you are talking about prprprprprpr "bird call" noise when you back off, how come it's such a different sound?
Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
That noise is simple - Subaru doesn't run a BOV on their WRC entry - that chirping 'bird call' is the sound of backpedaling/forward rushing again compressed air!
-=[Matt]=-
---
...they're *awfully* tough on turbochargers...
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I had one and it just went woooooosh.....gushhhhhhhh, what would be kewl though is the chirping noise you are talking about prprprprprpr "bird call" noise when you back off, how come it's such a different sound?
Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
That noise is simple - Subaru doesn't run a BOV on their WRC entry - that chirping 'bird call' is the sound of backpedaling/forward rushing again compressed air!
-=[Matt]=-
---
...they're *awfully* tough on turbochargers...
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-
penty
BOV
So is that something I can buy ? to make the bird chirping noise ?
cheero
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
E-mail : penty@nettaxi.com
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
----- Original Message -----
From: Matt <mailto:jonesboy@sunwave.net> Walters
To: BC-BFLegacyWorks@egroups.com
Sent: Tuesday, November 28, 2000 6:11 PM
Subject: Re: [BC-BFLegacyWorks] RE: BOV
At 12:16 PM 28/11/2000 +0000, you wrote:
I had one and it just went woooooosh.....gushhhhhhhh, what would be kewl though is the chirping noise you are talking about prprprprprpr "bird call" noise when you back off, how come it's such a different sound?
Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
That noise is simple - Subaru doesn't run a BOV on their WRC entry - that chirping 'bird call' is the sound of backpedaling/forward rushing again compressed air!
-=[Matt]=-
---
...they're *awfully* tough on turbochargers...
To unsubscribe from this group, send an email to:
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cheero
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
E-mail : penty@nettaxi.com
¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°º¤ø,¸¸
----- Original Message -----
From: Matt <mailto:jonesboy@sunwave.net> Walters
To: BC-BFLegacyWorks@egroups.com
Sent: Tuesday, November 28, 2000 6:11 PM
Subject: Re: [BC-BFLegacyWorks] RE: BOV
At 12:16 PM 28/11/2000 +0000, you wrote:
I had one and it just went woooooosh.....gushhhhhhhh, what would be kewl though is the chirping noise you are talking about prprprprprpr "bird call" noise when you back off, how come it's such a different sound?
Could you name someone who has a prprprprprpprprpr bov on there subaru so I will get the right one, surly someone here has one????
That noise is simple - Subaru doesn't run a BOV on their WRC entry - that chirping 'bird call' is the sound of backpedaling/forward rushing again compressed air!
-=[Matt]=-
---
...they're *awfully* tough on turbochargers...
To unsubscribe from this group, send an email to:
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-
Dave aka DLC/dackampf
BOV
You wouldn't want to.
Since the air that the BOV is moving around has already been measured
by the Mass Airflow Sensor, it must be kept inside the system in
order for the engine management system to work properly and keep your
car running well. If you vent that air to atmosphere, you're
reducing the amount of air that the engine has and the air/fuel ratio
will go rich. It's not nearly as bad as lean, but still not good.
--- In BC-BFLegacyWorks@egroups.com, "penty" <penty@n...> wrote:
> So is that something I can buy ? to make the bird chirping noise ?
>
> cheero
>
> ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°
º¤ø,¸¸
> Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
> E-mail : penty@n...
> ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°
º¤ø,¸¸
>
>
>
> ----- Original Message -----
> From: Matt Walters
> To: BC-BFLegacyWorks@egroups.com
> Sent: Tuesday, November 28, 2000 6:11 PM
> Subject: Re: [BC-BFLegacyWorks] RE: BOV
>
>
> At 12:16 PM 28/11/2000 +0000, you wrote:
>
> I had one and it just went woooooosh.....gushhhhhhhh, what
would be kewl though is the chirping noise you are talking about
prprprprprpr "bird call" noise when you back off, how come it's such
a different sound?
>
> Could you name someone who has a prprprprprpprprpr bov on there
subaru so I will get the right one, surly someone here has one????
>
> That noise is simple - Subaru doesn't run a BOV on their
WRC entry - that chirping 'bird call' is the sound of
backpedaling/forward rushing again compressed air!
>
> -=[Matt]=-
> ---
> ...they're *awfully* tough on turbochargers...
>
> eGroups Sponsor
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
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Since the air that the BOV is moving around has already been measured
by the Mass Airflow Sensor, it must be kept inside the system in
order for the engine management system to work properly and keep your
car running well. If you vent that air to atmosphere, you're
reducing the amount of air that the engine has and the air/fuel ratio
will go rich. It's not nearly as bad as lean, but still not good.
--- In BC-BFLegacyWorks@egroups.com, "penty" <penty@n...> wrote:
> So is that something I can buy ? to make the bird chirping noise ?
>
> cheero
>
> ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°
º¤ø,¸¸
> Info: John Carlsson UK 92 Legacy 4 cam Turbo Estate
> E-mail : penty@n...
> ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,¤º°`°
º¤ø,¸¸
>
>
>
> ----- Original Message -----
> From: Matt Walters
> To: BC-BFLegacyWorks@egroups.com
> Sent: Tuesday, November 28, 2000 6:11 PM
> Subject: Re: [BC-BFLegacyWorks] RE: BOV
>
>
> At 12:16 PM 28/11/2000 +0000, you wrote:
>
> I had one and it just went woooooosh.....gushhhhhhhh, what
would be kewl though is the chirping noise you are talking about
prprprprprpr "bird call" noise when you back off, how come it's such
a different sound?
>
> Could you name someone who has a prprprprprpprprpr bov on there
subaru so I will get the right one, surly someone here has one????
>
> That noise is simple - Subaru doesn't run a BOV on their
WRC entry - that chirping 'bird call' is the sound of
backpedaling/forward rushing again compressed air!
>
> -=[Matt]=-
> ---
> ...they're *awfully* tough on turbochargers...
>
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Matt Scicchitano
BOV
--- In BC-BFLegacyWorks@egroups.com, "Dave aka DLC/dackampf"
<legacycentral@y...> wrote:
> You wouldn't want to.
>
> Since the air that the BOV is moving around has already been
measured
> by the Mass Airflow Sensor, it must be kept inside the system in
> order for the engine management system to work properly and keep
your
> car running well. If you vent that air to atmosphere, you're
> reducing the amount of air that the engine has and the air/fuel
ratio
> will go rich. It's not nearly as bad as lean, but still not good.
>
This has always been something that puzzled me a bit. I have heard
and read that theory many times before and fully understand the
reasoning behind it. But have a look at it this way and hopefully
someone can shed some light on this for me. Maybe I'm missing
something totally obvious.
OK, the air comes in and gets measured by the MAF and suddenly the
throttle plate shuts. Now, with a BOV that vents to the atmosphere,
the air that was just measured is released into the air, thus never
making it to the combustion chamber where the ample amount of fuel
has already been supplied before the throttle plate was closed, thus,
you get the rich condition( albeit for a split second).
Now, lets take the stock BOV that is of the recirculating type. The
air comes in and gets measured by the MAF and suddenly the throttle
plate shuts. Now the BOV vents the air that was just measured back
into the intake before the turbo, thus, never making it to the
combustion chamber where the ample amount of fuel has already been
supplied. Wouldn't this cause the same ever-so-slight rich condition.
I'm not disagreeing with the theory. Take a look through any Subaru
Hyper Rev book and you'll see that 95 percent of the top tuners go
through the extra effort to include a return pipe back to the intake
for the BOV when still using the MAF. I have an idea, but if someone
could explain why there is no rich condition with recirculating
BOV's, even though the air that they vent never reaches the engine
until after the throttle is opened again. But that does not take into
account the fuel that was supplied to the "invisible" air BEFORE the
throttle plate shut.
I ran with my stock BOV venting to the atomoshere just for a few
minutes to see what it was like. To be honest, I can't remember any
stumbles or pops between shifts. The car would not idle correctly
which I'm assuming was due to the stock spring not being stiff enough
to keep the valve shut at idle( thus major vacumn leak), since there
are a few Turbo Impreza owners with aftermarket(stiff) BOV's venting
to the atmosphere with no problems.
Sorry for the long post.
-Matt
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<legacycentral@y...> wrote:
> You wouldn't want to.
>
> Since the air that the BOV is moving around has already been
measured
> by the Mass Airflow Sensor, it must be kept inside the system in
> order for the engine management system to work properly and keep
your
> car running well. If you vent that air to atmosphere, you're
> reducing the amount of air that the engine has and the air/fuel
ratio
> will go rich. It's not nearly as bad as lean, but still not good.
>
This has always been something that puzzled me a bit. I have heard
and read that theory many times before and fully understand the
reasoning behind it. But have a look at it this way and hopefully
someone can shed some light on this for me. Maybe I'm missing
something totally obvious.
OK, the air comes in and gets measured by the MAF and suddenly the
throttle plate shuts. Now, with a BOV that vents to the atmosphere,
the air that was just measured is released into the air, thus never
making it to the combustion chamber where the ample amount of fuel
has already been supplied before the throttle plate was closed, thus,
you get the rich condition( albeit for a split second).
Now, lets take the stock BOV that is of the recirculating type. The
air comes in and gets measured by the MAF and suddenly the throttle
plate shuts. Now the BOV vents the air that was just measured back
into the intake before the turbo, thus, never making it to the
combustion chamber where the ample amount of fuel has already been
supplied. Wouldn't this cause the same ever-so-slight rich condition.
I'm not disagreeing with the theory. Take a look through any Subaru
Hyper Rev book and you'll see that 95 percent of the top tuners go
through the extra effort to include a return pipe back to the intake
for the BOV when still using the MAF. I have an idea, but if someone
could explain why there is no rich condition with recirculating
BOV's, even though the air that they vent never reaches the engine
until after the throttle is opened again. But that does not take into
account the fuel that was supplied to the "invisible" air BEFORE the
throttle plate shut.
I ran with my stock BOV venting to the atomoshere just for a few
minutes to see what it was like. To be honest, I can't remember any
stumbles or pops between shifts. The car would not idle correctly
which I'm assuming was due to the stock spring not being stiff enough
to keep the valve shut at idle( thus major vacumn leak), since there
are a few Turbo Impreza owners with aftermarket(stiff) BOV's venting
to the atmosphere with no problems.
Sorry for the long post.
-Matt
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Dave aka DLC/dackampf
BOV
I see your point Matt.
If the amount of air vented is small, then it shouldn't affect the
A/F reading more than if it were closed. Either way you'll have a
rich condition for a moment.
Since the BOVs on Imprezas are obviously much stronger, they would be
able to keep from creating a vacuum leak, and therefore work well.
Maybe i'll ask shiv in the Vishnu forum.
> This has always been something that puzzled me a bit. I have heard
> and read that theory many times before and fully understand the
> reasoning behind it. But have a look at it this way and hopefully
> someone can shed some light on this for me. Maybe I'm missing
> something totally obvious.
>
> OK, the air comes in and gets measured by the MAF and suddenly the
> throttle plate shuts. Now, with a BOV that vents to the atmosphere,
> the air that was just measured is released into the air, thus never
> making it to the combustion chamber where the ample amount of fuel
> has already been supplied before the throttle plate was closed,
thus,
> you get the rich condition( albeit for a split second).
>
> Now, lets take the stock BOV that is of the recirculating type. The
> air comes in and gets measured by the MAF and suddenly the throttle
> plate shuts. Now the BOV vents the air that was just measured back
> into the intake before the turbo, thus, never making it to the
> combustion chamber where the ample amount of fuel has already been
> supplied. Wouldn't this cause the same ever-so-slight rich
condition.
>
> I'm not disagreeing with the theory. Take a look through any Subaru
> Hyper Rev book and you'll see that 95 percent of the top tuners go
> through the extra effort to include a return pipe back to the
intake
> for the BOV when still using the MAF. I have an idea, but if
someone
> could explain why there is no rich condition with recirculating
> BOV's, even though the air that they vent never reaches the engine
> until after the throttle is opened again. But that does not take
into
> account the fuel that was supplied to the "invisible" air BEFORE
the
> throttle plate shut.
>
> I ran with my stock BOV venting to the atomoshere just for a few
> minutes to see what it was like. To be honest, I can't remember any
> stumbles or pops between shifts. The car would not idle correctly
> which I'm assuming was due to the stock spring not being stiff
enough
> to keep the valve shut at idle( thus major vacumn leak), since
there
> are a few Turbo Impreza owners with aftermarket(stiff) BOV's
venting
> to the atmosphere with no problems.
>
> Sorry for the long post.
>
> -Matt
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If the amount of air vented is small, then it shouldn't affect the
A/F reading more than if it were closed. Either way you'll have a
rich condition for a moment.
Since the BOVs on Imprezas are obviously much stronger, they would be
able to keep from creating a vacuum leak, and therefore work well.
Maybe i'll ask shiv in the Vishnu forum.
> This has always been something that puzzled me a bit. I have heard
> and read that theory many times before and fully understand the
> reasoning behind it. But have a look at it this way and hopefully
> someone can shed some light on this for me. Maybe I'm missing
> something totally obvious.
>
> OK, the air comes in and gets measured by the MAF and suddenly the
> throttle plate shuts. Now, with a BOV that vents to the atmosphere,
> the air that was just measured is released into the air, thus never
> making it to the combustion chamber where the ample amount of fuel
> has already been supplied before the throttle plate was closed,
thus,
> you get the rich condition( albeit for a split second).
>
> Now, lets take the stock BOV that is of the recirculating type. The
> air comes in and gets measured by the MAF and suddenly the throttle
> plate shuts. Now the BOV vents the air that was just measured back
> into the intake before the turbo, thus, never making it to the
> combustion chamber where the ample amount of fuel has already been
> supplied. Wouldn't this cause the same ever-so-slight rich
condition.
>
> I'm not disagreeing with the theory. Take a look through any Subaru
> Hyper Rev book and you'll see that 95 percent of the top tuners go
> through the extra effort to include a return pipe back to the
intake
> for the BOV when still using the MAF. I have an idea, but if
someone
> could explain why there is no rich condition with recirculating
> BOV's, even though the air that they vent never reaches the engine
> until after the throttle is opened again. But that does not take
into
> account the fuel that was supplied to the "invisible" air BEFORE
the
> throttle plate shut.
>
> I ran with my stock BOV venting to the atomoshere just for a few
> minutes to see what it was like. To be honest, I can't remember any
> stumbles or pops between shifts. The car would not idle correctly
> which I'm assuming was due to the stock spring not being stiff
enough
> to keep the valve shut at idle( thus major vacumn leak), since
there
> are a few Turbo Impreza owners with aftermarket(stiff) BOV's
venting
> to the atmosphere with no problems.
>
> Sorry for the long post.
>
> -Matt
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Matt Scicchitano
BOV
--- In BC-BFLegacyWorks@egroups.com, "Dave aka DLC/dackampf"
<legacycentral@y...> wrote:
>
> Since the BOVs on Imprezas are obviously much stronger, they would
be
> able to keep from creating a vacuum leak, and therefore work well.
>
> Maybe i'll ask shiv in the Vishnu forum.
>
Yeah, I believe most of the guys are using the Greedy or HKS BOV's
that are adjustable for stiffness of the spring. I think Shiv was one
of the first guys that didn't recirculate the air back into the
intake. The new Apex-i S-AFC can take the atomsphere-venting BOV's on
MAF cars into account and adjust things slightly, but I believe Shiv
said he didn't have to use the feature at all because it was working
so good as-is. Let us know if you get an answer.
-Matt
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<legacycentral@y...> wrote:
>
> Since the BOVs on Imprezas are obviously much stronger, they would
be
> able to keep from creating a vacuum leak, and therefore work well.
>
> Maybe i'll ask shiv in the Vishnu forum.
>
Yeah, I believe most of the guys are using the Greedy or HKS BOV's
that are adjustable for stiffness of the spring. I think Shiv was one
of the first guys that didn't recirculate the air back into the
intake. The new Apex-i S-AFC can take the atomsphere-venting BOV's on
MAF cars into account and adjust things slightly, but I believe Shiv
said he didn't have to use the feature at all because it was working
so good as-is. Let us know if you get an answer.
-Matt
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William D. Robinson
BOV
Stock Subaru BOVs (all of them everywhere in the world) are among the wimpiest in the OEM world. In the levels of boost that most of us want to run, they either open slowly and make a noise like blowing across a jug, or they cause a harsh and unpleasant surge at higher boost levels. I have a big purple TurboXS adjustable one from Australia (about $200 US) and it works well. I don't believe in dumping to the atmosphere. I prefer to cycle back upstream of the turbo so that all air that enters the MAF stays accounted for.
ps Welcome Mike The Legacy Guy!
Bill Robinson
92 Turbo Sedan 5-speed
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ps Welcome Mike The Legacy Guy!
Bill Robinson
92 Turbo Sedan 5-speed
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Miki
BOV
--- In BC-BFLegacyWorks@y..., "JohnnyG" <grilla@i...> wrote:
> Leaking BOV ...the factory ones are not much chop.
>
> John Gillon
> www.clubsub.org.nz
John, any suggestions what make/model would be a good one to replace
the stock BOV with? Just had mine replaced a few months back...
didn't know this back then though, so I bought the stock one,
~USD$100 here in Finland...
* Miki *
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> Leaking BOV ...the factory ones are not much chop.
>
> John Gillon
> www.clubsub.org.nz
John, any suggestions what make/model would be a good one to replace
the stock BOV with? Just had mine replaced a few months back...
didn't know this back then though, so I bought the stock one,
~USD$100 here in Finland...
* Miki *
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JohnnyG
BOV
I know of many satisfied Subaru single turbo owners using the BOVs from
Bailey Motorsports. The unique design provides easy-setup and doesn't
require ongoing adjustments, as many of the cheap ones do. Options include
venting to atmosphere and recirculating.
Their website is a bit "grim", but all the details are there.
http://www.baileymotorsport.co.uk
John Gillon
www.clubsub.org.nz
----- Original Message -----
From: Miki <awdturbodude@yahoo.com>
To: <BC-BFLegacyWorks@yahoogroups.com>
Sent: Sunday, January 28, 2001 120 PM
Subject: [BC-BFLegacyWorks] Re: BOV
> --- In BC-BFLegacyWorks@y..., "JohnnyG" <grilla@i...> wrote:
> > Leaking BOV ...the factory ones are not much chop.
> >
> > John Gillon
> > www.clubsub.org.nz
>
> John, any suggestions what make/model would be a good one to replace
> the stock BOV with? Just had mine replaced a few months back...
> didn't know this back then though, so I bought the stock one,
> ~USD$100 here in Finland...
>
> * Miki *
>
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
>
>
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BC-BFLegacyWorks-unsubscribe@egroups.com
Bailey Motorsports. The unique design provides easy-setup and doesn't
require ongoing adjustments, as many of the cheap ones do. Options include
venting to atmosphere and recirculating.
Their website is a bit "grim", but all the details are there.
http://www.baileymotorsport.co.uk
John Gillon
www.clubsub.org.nz
----- Original Message -----
From: Miki <awdturbodude@yahoo.com>
To: <BC-BFLegacyWorks@yahoogroups.com>
Sent: Sunday, January 28, 2001 120 PM
Subject: [BC-BFLegacyWorks] Re: BOV
> --- In BC-BFLegacyWorks@y..., "JohnnyG" <grilla@i...> wrote:
> > Leaking BOV ...the factory ones are not much chop.
> >
> > John Gillon
> > www.clubsub.org.nz
>
> John, any suggestions what make/model would be a good one to replace
> the stock BOV with? Just had mine replaced a few months back...
> didn't know this back then though, so I bought the stock one,
> ~USD$100 here in Finland...
>
> * Miki *
>
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
>
>
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sean john
BOV
Has anyon used a turboxs boost controller? Any
opinions on install and performance?
nue
91 legacy turbo
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opinions on install and performance?
nue
91 legacy turbo
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Dave C
BOV
I've used the Hallman, which is very similar to the XS. It worked
well, but i've never regretted getting the Apexi AVC-R.
--- In BC-BFLegacyWorks@y..., sean john <r32657@y...> wrote:
> Has anyon used a turboxs boost controller? Any
> opinions on install and performance?
>
> nue
> 91 legacy turbo
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well, but i've never regretted getting the Apexi AVC-R.
--- In BC-BFLegacyWorks@y..., sean john <r32657@y...> wrote:
> Has anyon used a turboxs boost controller? Any
> opinions on install and performance?
>
> nue
> 91 legacy turbo
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