lavishauto
Member
- :
- 2007 mazdaspeed3
Which one should I do?
vent BOV or recirculate?
- Thread starter lavishauto
- Start date
lavishauto
Member
- :
- 2007 mazdaspeed3
Bumpage
littlemimus
fear the mighty sandvich!
- :
- Mazdaspeed protege 2003
whatever you want. you can vent for the sound or recirculate it for slightly less lag between shifts. depending on which one you will need to relocate the maf.
float_6969
Member
- :
- 2003.5 MSP Blue #2450, 1995 Nissan 240sx, 1996 Mazda Miata
Apples or Bananas? There's no right or wrong answer. They both have pro's and con's. Do you know what they are?
lavishauto
Member
- :
- 2007 mazdaspeed3
not really :-/.. i was gunna recirculate it anyways cause honestly it sounds pretty much the same to me.. so i was just gunna keep it the way it is now. i had ordered a Flange or adaptor or whatever you want to call it to recirculate it. hopefully it comes today. *fingers crossed*. but can somebody explain how or send pics on how to recirculate it so i have an idea of what to do going into it? or can i pretty much just follow how my BPV is now? know what im saying? i know the hoses will be different though so..
- :
- 1989 RX-7 GXL Blaze Red
you really need to use the search button more often. you'll find answers faster
Not trying to be mean or anything, just saying it will yield your answers quicker and wont clutter up the forum with unnecessary threads
Not trying to be mean or anything, just saying it will yield your answers quicker and wont clutter up the forum with unnecessary threads
Last edited:
lavishauto
Member
- :
- 2007 mazdaspeed3
I've already tried that. That's why I'm here.
lavishauto
Member
- :
- 2007 mazdaspeed3
About a year ago
lavishauto
Member
- :
- 2007 mazdaspeed3
I find a MSP on YouTube that has a Greddy type S BOV just like mine and is recirculated and is running 6-7 pounds and has stock turbo.
Perro del Sol
Member
- :
- 2003 MSP, Spicy Orange, 2004 Mazda 6 Hatch, 2004 Mazda 6 Wagon
Personally, I go 50/50 with my BOV
lavishauto
Member
- :
- 2007 mazdaspeed3
can you explain to me how i do that? im trying at this very moment. and nothings going on. i found a MSp on youtube and its recirculated on 6-7 pounds and you can hear it. mine sounds like normal. idk if my spring is to stiff itself or what.
- :
- 2003.5 Mazdaspeed Protege
Recirculate. Venting has no benefit other than it sounds cool. And run a hks ssqv thos are sick
- :
- 2003.5 Mazdaspeed Protege
Recitculate can be adjusted on the bov there should be a screw with hex key u can change it to recurc or vent just by loostening it or tightening the spring
float_6969
Member
- :
- 2003.5 MSP Blue #2450, 1995 Nissan 240sx, 1996 Mazda Miata
OK, here's the skinny.
Recirc
Pro's
-No super rich condition with a MAFS between shifts that can cause hesitation
-More pressure remains in the hotpipe between shifts allowing for faster response between shifts
Con's
-Will often need a much stronger spring than a atmospheric valve due to the vacuum from the intake of the turbo acting on the valve to try and open it in boost. This can cause issues in high boost situations where putting a strong enough spring to keep the valve closed in boost will not allow the valve to open at low boost levels and you can get low boost compressor surge (turkey). This isn't an issue with the Synchronic and HKS valves due to their design.
-Not as much sound
Vent
Pro's
-Sound
-In high boost situations with out a MAFS, the valve can be "tuned" to work over a wider range of boost pressures with a lighter spring.
Con's
-In MAFS systems it may cause issues with the idle/running between shifts or after letting the throttle off due to metered air being vented, causing a very rich condition.
-Not as responsive between shifts as a recirculated setup
Recirc
Pro's
-No super rich condition with a MAFS between shifts that can cause hesitation
-More pressure remains in the hotpipe between shifts allowing for faster response between shifts
Con's
-Will often need a much stronger spring than a atmospheric valve due to the vacuum from the intake of the turbo acting on the valve to try and open it in boost. This can cause issues in high boost situations where putting a strong enough spring to keep the valve closed in boost will not allow the valve to open at low boost levels and you can get low boost compressor surge (turkey). This isn't an issue with the Synchronic and HKS valves due to their design.
-Not as much sound
Vent
Pro's
-Sound
-In high boost situations with out a MAFS, the valve can be "tuned" to work over a wider range of boost pressures with a lighter spring.
Con's
-In MAFS systems it may cause issues with the idle/running between shifts or after letting the throttle off due to metered air being vented, causing a very rich condition.
-Not as responsive between shifts as a recirculated setup
littlemimus
fear the mighty sandvich!
- :
- Mazdaspeed protege 2003
some would argue that the maf sensor was never designed to be under anything more than atmospheric pressure. but whom really knows. as for the hesitation i still get it. im pretty sure the only way to get rid of hesitation is by tuning the car.
JDMazdaFamilia
Member
You forgot to mention that recirculation is more likely to cause compressor surge. Venting metered air should not occur for the most part if your bov is as far from the maf as possible.
That being said i still haven't decided which one to go with. With a ball bearing turbo compressor surge isn't a big deal. The only thing is I heard the maf relocation (to the cold pipe) works a lot better than pre turbo. But even if that's true any kind of pre turbo maf hesitation could be fixed with proper tuning shouldn't it?
That being said i still haven't decided which one to go with. With a ball bearing turbo compressor surge isn't a big deal. The only thing is I heard the maf relocation (to the cold pipe) works a lot better than pre turbo. But even if that's true any kind of pre turbo maf hesitation could be fixed with proper tuning shouldn't it?
float_6969
Member
- :
- 2003.5 MSP Blue #2450, 1995 Nissan 240sx, 1996 Mazda Miata
I wasn't considering a relocated MAFS in any of that. That's a whole different topic.
JDMazdaFamilia
Member
Then I wouldn't consider venting at all without a relocated maf
