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Old 06-05-2012, 06:18 PM   #1
nt24
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Default 05 wrx blows back out of air filter, why?

I have a 2005 wrx, mods are: tbe catless, up, cp, inlet pipe, post maf hose, ram intake, lightweight crank pulley, sti tmic, oversized rad, turboxs bov, turbo blanket and a turboxs delta utec.

I just put the sti tmic, lightweight crank pulley and turbo blanket on along with doing the timing belt.

After all of this I noticed that before the blow off(mostly on lower rpms in higher gears), there was air blowing back out of the air filter. It sounds like it sputters back out.

I checked all of the vacuum lines for the turbo and none were kinked or cracked. There are no leaks in any parts of the intake or exhaust as far as I can tell.


Any reason it is doing this? It seems to take away from the blow off and I don't know if I should be worried or if it's normal?

-Nick-
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Old 06-06-2012, 04:02 PM   #2
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So you're getting oil blowback in the filter? Is that what you mean?
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Old 06-06-2012, 04:41 PM   #3
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put stock bov back on. probably getting stuck or leaking or something making a sound u think is the intake.
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Old 06-06-2012, 05:56 PM   #4
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No, no oil is coming back out, the filter is still clean. And i know the air is being pushed back out of the filter because i can feel it and hear it after someone revs it. The noise and air comes out of the cone.

If I kink the vaccum line off of the bov and the noise is even more prominent.

I thought maybe it was excess air that didn't go through the turbo just coming back out?? But Idk, I haven't found anything, on any sites, when i searched.

-Nick-
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Old 06-06-2012, 11:28 PM   #5
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I switched to the sti tmic from a fmic, using the same bov with an adapter, if that helps



-Nick-
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Old 06-07-2012, 03:47 PM   #6
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I'm pretty sure that is not even possible...
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Old 06-07-2012, 04:13 PM   #7
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I have the same thing. I asked my tuner and he said its normal.
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Old 06-07-2012, 04:23 PM   #8
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Only thing I can think of is because of your BOV not venting correctly. Pressurized air being pushed back out through your turbo and back out the intake filter. Your turbo probably doesn't like that too much.

I cant see it being really bad for the car, only thing I can see it hurting is your turbo by putting backspin and excess wear on it.

Put the stock bpv on the car and see if it still does it. It shouldn't
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Old 06-07-2012, 05:01 PM   #9
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i think BlInk311 is right
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Old 06-07-2012, 08:57 PM   #10
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Yeah, I follow what you're saying and I thought the same thing.
I guess the part that is throwing me off is that it didn't do it before with the same bov and the fmic setup.

I don't have the stock bpv to try it though, sadly, and that is why i was wondering if it was going to hurt the car so i asked haha I'll see if i can find one that someone will let me borrow.

Thanks guys, and if anyone else has any ideas I'm still open? Or if anyone has this problem too.

-Nick-
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Old 06-07-2012, 09:50 PM   #11
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i have a extra bpv if u need one
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Old 06-07-2012, 11:06 PM   #12
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Yea, compressor surge is causing that. I don't know if that type of BOV is adjustable but if it is, loosen it. If it vents too late because of being too tight the column of air in your intake stream will push back through your turbo and go through your inlet causing your concern.
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Old 06-08-2012, 09:52 AM   #13
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Where is your BOV in your piping? Before the the intercooler or after the intercooler?
Technically it should be after but it'll work either way but the added air volume may be causing it in this case too. I haven't noticed it from mine.
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Old 06-08-2012, 08:08 PM   #14
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Quote:
Originally Posted by nt24 View Post
Yeah, I follow what you're saying and I thought the same thing.
I guess the part that is throwing me off is that it didn't do it before with the same bov and the fmic setup.

-Nick-
Your BOV has an internal issue! Not sure if you can maintain it, but find a stock one for cheap for the time being (and preferably permanently!).
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Old 06-08-2012, 10:34 PM   #15
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i have a stock one if you want one. ill sell it to you for cheap if you want it
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Old 06-08-2012, 11:14 PM   #16
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Quote:
Originally Posted by JdMS13 View Post
Yea, compressor surge is causing that. I don't know if that type of BOV is adjustable but if it is, loosen it. If it vents too late because of being too tight the column of air in your intake stream will push back through your turbo and go through your inlet causing your concern.
this, you dont need a stock bpv.
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Old 06-09-2012, 09:32 AM   #17
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check your pcv valve if you still have one.

After you do fix it take your top mount off and clean er out...its most likely will have some oil in it too....
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Old 06-09-2012, 12:40 PM   #18
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By loosening the bov, would that be the same as removing one of the washer under the spring? therefore making the spring softer?

I will let ya know subawuu20 if I need one after I try this haha

Blink311, I have a tmic on it now, before on the fmic the bov was before the ic.

And I'll look into the pcv valve, but I justttt put the tmic on and it looked clean inside
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Old 06-14-2012, 12:01 AM   #19
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I took a washer out from under the spring in the bov...which in sense is loosening it...and the problem is still there.
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Old 06-14-2012, 12:13 AM   #20
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Sound like your npc is the problem. It might be getting stuck cause of a bur on the piston. You can take it apart and de bur and grease with lithium grease. Or just get a new one.
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Old 06-14-2012, 03:00 AM   #21
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Quote:
Originally Posted by JdMS13 View Post
Yea, compressor surge is causing that. the column of air in your intake stream will push back through your turbo and go through your inlet causing your concern.
Correct sir. and fixed/edited this quote

Quote:
Originally Posted by nt24 View Post
I took a washer out from under the spring in the bov...which in sense is loosening it...and the problem is still there.
Taking out a small washer isnt going to do a damn thing unless it was 20mm thick. Get a different BOV with more adjustment or go back to a stock BPV, but still doubtful that would even fix it. Doing that would just be better for the engine in general.

When you free rev the engine its not going to use as much air as you just pulled in so it pushes it back through the intake. If you rev it high enough to cause the BOV to open then this is only going to be amplified x10 when the BOV shuts. Driving the car under a load (just driving period, not idle in a driveway) with no issues should tell you this is normal. The BOV sounds different because you went back to a top mount!!

Its not a pcv.... thats ludicrous. The other posts in this thread are so far from being anything close that it blows my mind.

Last edited by UK-Wagon; 06-14-2012 at 03:07 AM.
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Old 06-14-2012, 10:38 PM   #22
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I'll try cleaning it up and greasing it.

And Uk-Wagon, are you saying a stock bpv would fix it? If so, how so? And yeah, I understand the difference in a sound from a fmic to a tmic but there shouldn't be air coming out of the filter, that much I am pretty sure of but I have been wrong before haha
and yes, even while driving it pushes air back out...like I said, more in higher gears at lower rpms with boost, but when i let off..right before the blow off
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Old 06-14-2012, 11:25 PM   #23
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No, read what i said again. Changing the BOV back to a BPV probably wont change much at all. But as for the health of the car it would be better to do it anyways. Our cars are meant for BPV's....

The symptom you are asking about is completely normal. Dont worry about it, just read what i said, again.

Main quote from my last post.
"When you free rev the engine its not going to use as much air as you just pulled in so it pushes it back through the intake."

In other words, at idle or free rev (sitting stationary), when you rev the engine then let off (close the throttle plate). There will still be excess air that is not used because of the Intercooler system. So that air gets pushed back out the intake. Its less noticable with a FMIC because there is so much piping and the intercooler is so much larger and further from the throttle, that the air has more room to de-pressurize on its own so to say.

Thats the best way i can explain it in lamans terms. Does it make sense now?

Last edited by UK-Wagon; 06-14-2012 at 11:31 PM.
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Old 06-15-2012, 03:08 PM   #24
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Yup, it does. I was taking what you said in a different way...read it after a long day of work and didn't digest it quite right haha

Thanks a ton guys
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Old 06-28-2012, 11:01 PM   #25
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btw, i cleaned my bov out, greased it and added a fourth washer...the noise is just about gone and it fixed my idle problem (after a rev the rpms would drop below 500)
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