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Old 09-11-2022, 08:34 AM   #1
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atmoshpere/recirc bov with z32 maf sr question

I guess I'm a little ricey at heart because I miss the bov sounds, can we use a bov that recirculates AND bleeds off too atmosphere with a z32 maf on sr20det or will it stall out after boosting?will this supply enough air to maf to make it happy or em i stuck recirculated bov only?
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Old 09-11-2022, 04:52 PM   #2
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Originally Posted by spools420a View Post
I guess I'm a little ricey at heart because I miss the bov sounds, can we use a bov that recirculates AND bleeds off too atmosphere with a z32 maf on sr20det or will it stall out after boosting?will this supply enough air to maf to make it happy or em i stuck recirculated bov only?
Convert to MAP and you can have all the ricer sounds.
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Old 09-11-2022, 05:00 PM   #3
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You can switch to aluminum intake piping, it'll help amplify the sound vs. the rubber intake hose. I mean, you can vent to atmosphere with a MAF, I did for years, it'll just run a little meh for a second between shifts. Keep in mind that this is coming from a person who is now switching to MAP and is recirculating his BOV. I'll let the younger guys make all the noise.
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Old 09-11-2022, 09:57 PM   #4
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If you release air that the maf previously read the engine runs excessive rich,

the extra fuel washes down oil from the cylinder walls and leads to excessive ring wear and low compression over 10 to 20 years as evinced by the myriad vehicles I've witnessed it happen to

Recirculate to protect the engine.

Also recirculation conserves kinetic energy by returning air molecules with organized vector velocity components to the compressor. This in turn improves compressor pressure ratio and improves spool character for any rpm including off idle.
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Old 09-12-2022, 08:18 AM   #5
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I have the HKS SSQV S14/15 kit with the recirculation bung along with an Apexi induction pipe, BOV sound is pretty loud, but comes from the driver's side now lol. So the comment above about aluminum piping certainly has some merit.
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Old 09-13-2022, 11:44 AM   #6
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Originally Posted by LoSt180 View Post
I have the HKS SSQV S14/15 kit with the recirculation bung along with an Apexi induction pipe, BOV sound is pretty loud, but comes from the driver's side now lol. So the comment above about aluminum piping certainly has some merit.
Of course it does. Rubber doesn?t do well with acoustic vibrations and resonance.
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Old 09-13-2022, 01:09 PM   #7
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fwiw i have blacktop with maf with a ssqv vented to atmosphere and have no issues. between shifts or otherwise
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Old 09-13-2022, 06:42 PM   #8
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fwiw i have blacktop with maf with a ssqv vented to atmosphere and have no issues. between shifts or otherwise
1. SSQV does not hang open at idle nor does it release much if any airflow at low pressure, say 0 to 5psi. Instead, it forces compressor into surge condition which will wear out the turbocharger.

2. The OEM and PFC ecu have a fuel cut for TPS conditional < 1.5%? above roughly 1400rpm which means while the bypass is open there is no issue with overfueling the engine in my experience even with a maf sensor.

The issue with overfueling occurs on push-type bypass (like factory style) where it can hang open under 1400rpm preventing surge, the maf tries to idle the engine and the leaking air causes excess fuel and idle issues.

Correct solution is push style bypass recirculated, prevent surge, prevent over fuel condition. SSQV is a trade off, you give up turbocharger lifespan for the atmospheric blow off affect. Indeed we installed hundreds of SSQV back in the day because we knew it would keep the engine running smooth despite being atmospherically vented. However you can easily hear the surge conditional and now understand it means excess compressor wear.
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Old 09-14-2022, 08:50 AM   #9
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Quote:
Originally Posted by burnsauto View Post
I mean, you can vent to atmosphere with a MAF, I did for years, .
i cant,ever since i upgraded to a 2871r and needed to use a z32 maf it will stall everytime i come out of boost and let off the gas.
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Old 09-14-2022, 09:06 AM   #10
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Originally Posted by jr_ss View Post
Convert to MAP and you can have all the ricer sounds.
there are two types of people in here,ones who admit they like bov sounds and others who pretend they dont like the sounds to go along with the herd.

deep down were all gear heads who love these turbo sounds even if we dont admit it.

mine makes zero sound,im not looking for "hey everyone look at me" obnoxious bov I'm just looking for somthing rather then nothing at all.

anyways I will take the adviseb from others I will stay recirculated and try alluminum piping to acheive this.thank you all for the input.
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Old 09-14-2022, 09:15 AM   #11
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Quote:
Originally Posted by biasword View Post
fwiw i have blacktop with maf with a ssqv vented to atmosphere and have no issues. between shifts or otherwise
stock sr maf or z32 maf? these z32 mafs are much more sensitive to atmospheric relief then the sr maf.
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Old 09-14-2022, 09:37 AM   #12
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Assuming your harness/ecu still uses a stock pinout and you don't mind going a bit oldschool, you could scoop a used SAFC2 from someone and use the decel air setting to compensate for the atmospheric BOV. I would never recommend it as a tuner, but they can be had for cheap now and I remember it worked well when I used it for this purpose back in the day.
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Old 09-17-2022, 09:40 AM   #13
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Originally Posted by Rustys14 View Post
Assuming your harness/ecu still uses a stock pinout and you don't mind going a bit oldschool, you could scoop a used SAFC2 from someone and use the decel air setting to compensate for the atmospheric BOV. I would never recommend it as a tuner, but they can be had for cheap now and I remember it worked well when I used it for this purpose back in the day.
That actually works quite well. It has a specific function for assisting with the transition between ecu fuel tps based cutoff and return to idle conditions which clamps maximum maf voltage to prevent fuel cylinder washing. Its pretty slick how apexi knew about the issue and added this feature to something that they really didnt need to add it to. I used to recommend the SAFC-2 for this issue all the time in the past. But its hard to find one now.
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Old 09-17-2022, 07:46 PM   #14
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Quote:
Originally Posted by spools420a View Post
there are two types of people in here,ones who admit they like bov sounds and others who pretend they dont like the sounds to go along with the herd.

deep down were all gear heads who love these turbo sounds even if we dont admit it.

mine makes zero sound,im not looking for "hey everyone look at me" obnoxious bov I'm just looking for somthing rather then nothing at all.

anyways I will take the adviseb from others I will stay recirculated and try alluminum piping to acheive this.thank you all for the input.
As mentioned, the SSQV is your best bet for some sound and minimal negative effects.

I for one enjoy the rupture of noise when the throttle snaps shut and then the subsequent cacophony of chaos when it snaps back open.
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