BOV doesn't "blow off" when revving?

[dakota_gsx]

hey im new to the forums. just thought id start it off with a question.
i have heard that its not bad that my blow off valve doesnt blow off just when im revving. it does when im driving though. is this bad? is there a way to make it blow off when i am just revving? also i am having boost problems. im fairly sure it is a boost leak. spent a countless number of hours checking for the leak... didnt find anything major but does a boost leak sound like a fluttering sound? thanks everyone.
apexi fmic, greddy blow off valve, greddy ic hard pipe. super 16g turbo.

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[zhjiln]

welcome to the forums... and please recirculate that BOV now !!! its common to not hear the BOV when revving the car because you cannot produce any boost when in neutral except if you have 2-step/studderbox...

 

[Alex Bland]

yeah recirculate i think you might be jumping to blowing it out too soon

 

[black_gsx]

recirculate and see if it helps at all. I wouldnt worry too much about it making sound when reving in idle. The flutter could be a bad spring or just that its leaking as well.

 

[dakota_gsx]

im not too worried. im just curious to as why every other car i have ever heard, every other dsm i have heard, all release pressure at the bov when revving. everything in the engine has less than 10k miles on it so i dont think anything should really be too worn. thanks for the help again.

recirculate and see if it helps at all. I wouldnt worry too much about it making sound when reving in idle. The flutter could be a bad spring or just that its leaking as well.

flutter, you say a bad spring?
in what may i ask. and i looked for so long for the leak. had the pressure tester up to 15 psi and couldnt find anything!!@!@!@!@! it flutters at like 11psi when im driving.
thanks again.

 

[black_gsx]

Flutters while driving, oh ok. I thought you meant while idling. That may be common on the Greddy but not 100% sure, i know that the Apexi one that was on my buddies EVO did flutter at a certain RPM and PSI.

 

[booostedGSX]

As the first replier said, you should not produce boost in neutral or with the clutch in unless you have anti-lag. It is normal to not hear a sound from the blow-off valve.

 

[whiteboyz]

Dakota GSX. i have the same blowoff valve as you and mine makes a fluttering noise while boosting, that is normal. i have used the same bov on many of my other cars and it flutterd on all of them. but that is normal for the greddy bov.

 

[PandaMan]

Yep, like everyone else said you will not produce boost while in neutral. I'm sure you know this but your car will run better when your bov is recirculated. I had mine vented and when I shifted my wideband would drop really rich between shifts. Just so you know, your car will work better recirced

 

[misphit]

and i looked for so long for the leak. had the pressure tester up to 15 psi and couldnt find anything!!@!@!@!@! it flutters at like 11psi when im driving.
thanks again.

Try giving it some more pressure when you test. I usually boost leak test at 25psi, might reveal a few more leaks for you.

 

[dakota_gsx]

thanks everyone.
sorry i guess i wasnt clear enough.
when i meant fluttered. i meant not when i let off the pedal, like when i shift. i mean as im driving and when im really rippin, i legit can feel loss of power, and the flutter begins. if it helps, my boost gauge needle flutters as well. like from what i hear, its not the bov fluttering, you hear it through the exhaust.
sorry for the confusion. and i really appreciate all the help. definitely shouldve posted here a long time ago instead of my local community forum. thanks

 

[tkhaab_94]

as everyone else said please recirculate that BOV. its give you crappy MPG too. i did this on my eclipse for about 30 mins my gas went down a lot. i was just testing the sound.

 

[tjbiker031]

thanks everyone.
sorry i guess i wasnt clear enough.
when i meant fluttered. i meant not when i let off the pedal, like when i shift. i mean as im driving and when im really rippin, i legit can feel loss of power, and the flutter begins. if it helps, my boost gauge needle flutters as well. like from what i hear, its not the bov fluttering, you hear it through the exhaust.
sorry for the confusion. and i really appreciate all the help. definitely shouldve posted here a long time ago instead of my local community forum. thanks

All of your problems WILL be fix if you RECIRCULATE YOUR BOV!!!!!! It does nothing but make your car run rich when you let off the gas pedal and cause your engine to bog out and/or die

 

[Nikolay_Ruskov]

my personaly blow off on neutral just have to pushed to the 5000 rpm

 

[whiteboyz]

Like everyone stated RECIRCULATE YOUR BOV. that is why you are running crappy you are running rich inbetween shifts. question does you boost gauge have vacume gauge aswell? and if soo does it show that you have vacume? i had a problem where my boost gauge wasnt showing tht i was making vacume and it would flutter on me due to the fact that the spot i chose for vacume didnt have enough or any vacume at all. check to see if you are getting adequte vacume from the port you hve it hooked to.

 

[dakota_gsx]

yes my guage runs vacuum aswell. at idle, its at 14 vac, when im moving like any over 20mph, and at idle in neutral, the vac goes close to 20. not sure how that exactly works. and sorry to sound like a HUGE NOOB but i never have heard of recirculating my bov. how is this done?

 

[whiteboyz]

yes my guage runs vacuum aswell. at idle, its at 14 vac, when im moving like any over 20mph, and at idle in neutral, the vac goes close to 20. not sure how that exactly works. and sorry to sound like a HUGE NOOB but i never have heard of recirculating my bov. how is this done?

you would take a tube and hook it to your bov to you snorkle tube where it is caped off wich looks like from your picture a blue cap.

And as for your vacum gauge that seems weird. when you are at idle you shud have vacume or when yuou are barley giving it gas, but when you are actually driving it you should be building boost or at zero depending on how much gas you are giving the car.

nah dont worry about it bro,

 

[blakktalon]

The fluttering could be compressor surge, try adjusting that blowoff valve, i believe you can tighten and adjust the spring inside which in turn will determine when the blowoff valve releases, this could be the boost leak problem you speak of. I have heard of greddy bov's leaking due to improper adjustment, if it isnt releasing the air fast enough then you might be getting compressor surge in your turbo which would explain the fluttering noise, try doing this and let us know if it helps.

 

[zhjiln]

yes my guage runs vacuum aswell. at idle, its at 14 vac, when im moving like any over 20mph, and at idle in neutral, the vac goes close to 20. not sure how that exactly works. and sorry to sound like a HUGE NOOB but i never have heard of recirculating my bov. how is this done?

you know, 100% of people who responded to your post told you to recirculate your BOV... you might wanna search why it is important to recirculate and could very well solve all your problems you listed

 

[BoostedBeaver]

Like the secound person above me stated the flutter could be compressor surge. This is bad. Go to youtube and type this in if it sounds like what you hear i would adjust that BOV but also you should recirculate unless you have some way of dialing it in to your ecu that you are venting to the Atmosphere. You should read up on how to adjust the BOV just adjusting it sometimes is not good enough. Hope this helps and GOOD LUCK

 

[97_JDM_GSX]

you want your BOV whistle sound, get a GM MAF, and MAFT, then you can vent your BOV, which is what you have now. which does hurt your car, which you kinda notice now. an if you really want to hear the BOV in nuetral. you really need to get on the gas, like a previous post said, anything over 5000 rpm, but it wont be as loud as when your driving. If your hear other cars when in nuetral, its because they are probably built a bit more, FMIC, more boost ect

 

[dakota_gsx]

you would take a tube and hook it to your bov to you snorkle tube where it is caped off wich looks like from your picture a blue cap.

And as for your vacum gauge that seems weird. when you are at idle you shud have vacume or when yuou are barley giving it gas, but when you are actually driving it you should be building boost or at zero depending on how much gas you are giving the car.

nah dont worry about it bro,

so to recirculate, just gotta get a hose that goes from the outlet of the bov to the air filter pipe?
so just a little hose and connect it to where the blue cap is? and is this all that must be done?
thanks

 

[mountaineerjeff]

any chance the flutter is wastegate related? he said he can hear it through the exhaust while driving and it fluctuates the boost gauge. that sounds like a wastegate/pressure release issue. the wastegate might just be a little 'sticky' due to age or poor construction, or a million other things. but I would just go ahead and fix the recirculation on the bov and that will probably make your car run so much better that you wont be concerned with the flutter

 

[Ibbanez]

Definately recirc that bad boy unless you switch over to some sort of Speed Density tuning setup.

 

[dakota_gsx]

alrighty i went to pick up a hose for the recirculation, didnt have any in the size i needed. but, i thought the best way for you all to see my flutter issue, i would tape it. here are two separate videos. i just know im definitely gonna end up spending so much money fixing this car. goddamn last time i ever buy a car done up outta the states. and keep in mind, in the videos, i was always on the gas all the way until you hear the bov. i never let off a little. and some of you may be able to notice the check engine light is on.

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