what BOV's have worked for you

[wicked]

I need to know what BOV's are working without stall(it dosen't count if you still have your BPV).
I am using turbo XS type -s and it works great but I know it will stall without the BPV, I don't want to but it on my FMIC pipes,or the stock BPV
I've seen a lot of BOV's but I don't know exactly witch ones are dual piston,single piston rec.,or atmospheric.

main interest is:
greddy type -s
Blitz DD
HKS SSQV

I would much prefer atmospheric over recerculating.

 

[jeffmsp]

i just got a forge bov. 10 minute install (just dont break any hoses or T fittings) it wont stall out unless you do a huge whoosh - to - neutral kinda deal, it has only happend once for me. It isnt all that loud, but it requires no modification to the ic pipes so you can use it with the stock ones and is easy to take out everytime u have to go to the dealer. Its also not as loud as a greddy or hks, but after 24 hours of ownership i can honestly say I wouldnt want a louder woosh then what Ive got. Its mint. (thumb)

 

[JDM Sam]

http://www.msprotege.com/forum/showthread.php?t=49929&highlight=hks+ssqv+vid
hks ssqv

 

[dominoy2k1]

blitz dd

 

[PERRIN_JOHN]

Might I interject just a bit..... This car is a MAF based system. In order to maximize horse power you MUST recirculate your blow off valve. If you are not recirculating your blow off valve you are probably loosing horsepower and under certain situations causing damage to your engine.


Of course here is a picture of our BOV.
Features independent control of spring tention and flow rate

 

[mspeed101]

Might I interject just a bit..... This car is a MAF based system. In order to maximize horse power you MUST recirculate your blow off valve. If you are not recirculating your blow off valve you are probably loosing horsepower and under certain situations causing damage to your engine.


Of course here is a picture of our BOV.
Features independent control of spring tention and flow rate

John are you fimiliar with the compressor surge? Will this bov eliminate the turkey sound our cars give off?

 

[JOS3]

bah. who needs a blowoff valve? just stick your head out the window and go 'PSHH' when you shift

 

[mspeed101]

bah. who needs a blowoff valve? just stick your head out the window and go 'PSHH' when you shift

(lol2) I second that

 

[Brian MP5T]

TURBO XS RFL!(cool)

 

[Black Majik MSP]

Forge is the way to go for atmospheric...Jeff basically covered all of it. The only thing I have to add is that I had some stalling until I started downshifting & now it's fine.

 

[RyanJayG]

http://www.msprotege.com/forum/showthread.php?t=49929&highlight=hks+ssqv+vid
hks ssqv

I can vouch for this one.... his car sounds awesome, and didn't even threaten to stall even once.

 

[PERRIN_JOHN]

One last comment then I will step out.
Slight school lesson just for those who don't know how this tuff works.

Again this is a MAF based intake system. This means that the air is metered before the blow off valve. When the air passes through the MAF adaptor the volume of air is counted and relayed to the computer. This information is then used to calculate the correct amount of fuel for the injectors to release into the motor. When the blow off valve vents to atmosphere it released air, which has already been metered. This means the computer is making calculations on air fuel ratios for air that never enters the motor.
When your BOV goes off you will see a drop in stoichiometric air/fuel ratios because the computer thinks more air is entering the motor. The result is a low stoichiometric air/fuel ratio loosing horsepower. In extreme situations you can get "fuel wash", a condition in which excess fuel washes the oil film from the rings and cylinder walls. At this point metal-to-metal contact occurs and scuffing can take place. This condition is similar to a dry start.

When a BOV recirculates the air is redirected back into the intake at a point after the MAF sensor. The result is that the turbo remains spooled while briefly recirculating the air through the intake system and slowing the ingestion of new air through the MAF. Keeping air fuel ratios correct and the turbo spooled.

Not all cars are alike. A MAP sensor based vehicle with a sensor after the throttle body (example any Honda) CAN run a vent to atmosphere BOV with no issues at all. Sorry, I know it is not fair.

Yes you can run a vent to atmosphere BOV if you NEED the sound. But the higher the boost levels and higher the horse power the more of an issue this is. Especialy those of you with aftermarket turbo kits with additional injectors in the intake tubes. Be carefull!

Hoped that helped a little. I am not a perfect person. If anyone thinks that I have explained this wrong or have provided miss information please correct me.

Thanks guys.

 

[ICEMAN.2]

I will take off my FORGE tomorow to have my new TURBOSMART dual port install so i can vent and recirculate in the intake...

I dont like the FORGE due to lower rpm at idle and my car running very rich till i have install it...

 

[Rawyzf]

John,

Perrin's BOV...can you give more detail on it for the MSP's? How much, how hard is the install....where is the install....and what else is needed?

Oh....and can you run it with the stock BPV or does it replace it?

Thanks,
Ryan

One last comment then I will step out.
Slight school lesson just for those who don't know how this tuff works.

Again this is a MAF based intake system. This means that the air is metered before the blow off valve. When the air passes through the MAF adaptor the volume of air is counted and relayed to the computer. This information is then used to calculate the correct amount of fuel for the injectors to release into the motor. When the blow off valve vents to atmosphere it released air, which has already been metered. This means the computer is making calculations on air fuel ratios for air that never enters the motor.
When your BOV goes off you will see a drop in stoichiometric air/fuel ratios because the computer thinks more air is entering the motor. The result is a low stoichiometric air/fuel ratio loosing horsepower. In extreme situations you can get "fuel wash", a condition in which excess fuel washes the oil film from the rings and cylinder walls. At this point metal-to-metal contact occurs and scuffing can take place. This condition is similar to a dry start.

When a BOV recirculates the air is redirected back into the intake at a point after the MAF sensor. The result is that the turbo remains spooled while briefly recirculating the air through the intake system and slowing the ingestion of new air through the MAF. Keeping air fuel ratios correct and the turbo spooled.

Not all cars are alike. A MAP sensor based vehicle with a sensor after the throttle body (example any Honda) CAN run a vent to atmosphere BOV with no issues at all. Sorry, I know it is not fair.

Yes you can run a vent to atmosphere BOV if you NEED the sound. But the higher the boost levels and higher the horse power the more of an issue this is. Especialy those of you with aftermarket turbo kits with additional injectors in the intake tubes. Be carefull!

Hoped that helped a little. I am not a perfect person. If anyone thinks that I have explained this wrong or have provided miss information please correct me.

Thanks guys.

 

[Brian MP5T]

One last comment then I will step out.
Slight school lesson just for those who don't know how this tuff works.
Again this is a MAF based intake system. This means that the air is metered before the blow off valve. When the air passes through the MAF adaptor the volume of air is counted and relayed to the computer. This information is then used to calculate the correct amount of fuel for the injectors to release into the motor. When the blow off valve vents to atmosphere it released air, which has already been metered. This means the computer is making calculations on air fuel ratios for air that never enters the motor.
When your BOV goes off you will see a drop in stoichiometric air/fuel ratios because the computer thinks more air is entering the motor. The result is a low stoichiometric air/fuel ratio loosing horsepower. In extreme situations you can get "fuel wash", a condition in which excess fuel washes the oil film from the rings and cylinder walls. At this point metal-to-metal contact occurs and scuffing can take place. This condition is similar to a dry start. Bla Bla Bla Etc...
Thanks guys.

Simply move the Mass air to the positive side of the plumbing...as you can see in this picture, The mass air is just before the extra injectors... (naughty)

 

[PERRIN_JOHN]

Simply move the Mass air to the positive side of the plumbing...as you can see in this picture, The mass air is just before the extra injectors... (naughty)

Excellent point. This is a good option if you want your BOV to vent to atmosphere. Only one thing would worry me. May not be a problem at all but my first thought is heat. Now that the sensor is on the compressor side it is subjected to the hot compressed air. I could see where the life of the sensor could be shortened.
The sensor is made out of fiberglass reinforced plastic. The electronics could fail or the sensor could warp slightly pulling it from the center of the intake stream causing misreadings and poor run quality.
I suppose that even if you had to buy a new sensor every 5 years it would be worth it.
Good tip
One observation......may be an old picture......the blue wire loom (in your picture) in the lower left hand corner behind the down pipe is melting away.(flame2)
Not a problem but if you don't wrap it with a heat shield you may loose power to your radiator fan.

 

[jurgs01]

A BOV is needed to prevent cavitation of the air between the turbo and the TB during high RPM shifts (with aftermarket intake). Our BPV does not recirculate enough air to compensate for the increased flow and thus you get the turkey. True, blowing all of the air off would cause what you stated, but that's why some people have gone to the dual set up to create a happy medium. If the situation that you described were happening there would be hesitation (and stalling), but as long as you have a wideband and are monitoring your A/F ratio you are safe. It's all in adjusting to create the right balance.

 

[PERRIN_JOHN]

Our BPV does not recirculate enough air to compensate for the increased flow and thus you get the turkey.

100% true. "Not a cut on Mazdaqspeed" but it has one of the most peewee BOV's that ever came on a stock vehicle. Replacing it is difficult due to the small diameter hoses that attach it into the intake stream. Our R&D dept. is working on a solution.

If the situation that you described were happening there would be hesitation (and stalling), but as long as you have a wideband and are monitoring your A/F ratio you are safe. It's all in adjusting to create the right balance.

Yes and no. I realize that I left a few facts out.
When you are running at only partial throttle your BOV will be open to some extent due to a slight manifold vacuum. Not a problem on a recirculating BOV. If your BOV is vent to atmosphere, this air has been metered but is not entering the engine. For a half second the car will run rich.
The part that I left out is that the computer will correct this issue. It will see that the signal for the O2 sensors will show the rich condition and the computer will compensate.
When you then "give it gas" or "gun it" to full throttle the BOV will close allowing more air to be ingested into the motor. The computer has already compensated for the air that was bled off prior, leaning the mixture out. Now when you give it a quick burst of full throttle you swing the pendulum the other way and go into a lean condition. The computer will again quickly compensate and richen the mixture bringing it back to normal.
The poor computer spends its life trying to correct the air fuel mixture every time you press or let off the gas. This is most noticeable when attempting a pass on a free way. You may get a slight hesitation or quiver in power as you begin to accelerate. In some respects the changes are so quick the flutter of the LEDs on an A/F ration gauge may not even seem out of the ordinary.


Lets make this be kind to ECU's week (wiggle)

Sorry to ramble & sorry to all those who thought that their engine was going to explode because of their BOV. (gun)

cheers
(cheers2)

 

[03MSPRO]

everyone seems to be into the BOV hype.

 

[03MSPRO]

A BOV is needed to prevent cavitation of the air between the turbo and the TB during high RPM shifts (with aftermarket intake). Our BPV does not recirculate enough air to compensate for the increased flow and thus you get the turkey. True, blowing all of the air off would cause what you stated, but that's why some people have gone to the dual set up to create a happy medium. If the situation that you described were happening there would be hesitation (and stalling), but as long as you have a wideband and are monitoring your A/F ratio you are safe. It's all in adjusting to create the right balance.

you still get turkey even when using a BOV to atmosphere