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Old 06-17-2011, 09:40 PM   #276
Ruvim555
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great mod
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Old 06-17-2011, 10:10 PM   #277
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did this as well, great mod.
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Old 07-10-2011, 01:53 PM   #278
SubieMonte
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I'm a noob. Why is this a popular mod and would this negatively affect my daily driver? I've been thinking about doing it but just want to know more about why people our doing this. Thank you!
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Old 07-10-2011, 03:15 PM   #279
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Did u read the thread?
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Old 07-10-2011, 04:02 PM   #280
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Quote:
Originally Posted by Phatron
Did u read the thread?
Yes sir/ma'am. The entire thread. NTL. Is it possible to have the mod explained in lame *$$ terms?
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Old 07-10-2011, 04:05 PM   #281
Phatron
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The stock bpv isn't good at holding boost at higher pressures.

This mod is supposed to help the bpv control boost better at 20+ psi

Are your sure u read the thread? It says that in the first post....first sentence....
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Old 07-10-2011, 05:35 PM   #282
SubieMonte
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Quote:
Originally Posted by Phatron
The stock bpv isn't good at holding boost at higher pressures.
Atmospheric pressure or when when I have the throttle pegged? Is this a good mod for a stock wrx? Thank you for the help!
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Old 07-10-2011, 05:50 PM   #283
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not at all necessary for a stock wrx. save ur 0.16
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Old 07-10-2011, 08:58 PM   #284
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Quote:
Originally Posted by Phatron
not at all necessary for a stock wrx. save ur 0.16
Ok? Why?
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Old 07-10-2011, 08:59 PM   #285
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Lol seriously dude?

Read the thread. The answers are in it.

A stock wrx only boosts up to 12-14 psi so u are well below the threshold where leaking becomes an issue for the bpv.
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Old 07-10-2011, 09:19 PM   #286
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Quote:
Originally Posted by Phatron
Lol seriously dude?

Read the thread. The answers are in it.

A stock wrx only boosts up to 12-14 psi so u are well below the threshold where leaking becomes an issue for the bpv.
Thanks for setting The Noob straight.
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Old 08-02-2011, 11:57 AM   #287
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Yesterday after getting gas I left the station with some oncoming traffic approaching, so I accelerated moderately away. It felt uncommonly good somehow, stronger and rewarding first thru third. I wondered...

During the weekend I'd worked on my tune some, but I didn't really do anything that would account for my new-found zip. I'd flashed the tune, so the ECU was reset... maybe. It was only 75F, cool by recent standards... maybe.

Then I remembered what I'd done Saturday. After a thousand miles, most Stg2, I'd reflected on the way the car had acted during Friday's couple hours on the interstate, where at 75mph a slight throttle movement to account for a minor grade would be followed by a throttle retraction to keep speed under 80mph. This slight reduction in throttle was accompanied by the sound of the BPV venting, and a tiny "lurch" as the engine adjusted. I'd seen it before, and knew the solution... the $0.16 Mod.

On my LGT I did it because I ran 22+psi with an AVO380, and needed it for that. I did it on my 11 WRX because I liked what it did to the drive-ability of car... even throwing my own twist into the mod for reasons I've explained. This time on the 11 STi, although I recorded 20.5psi (in 100F) during a 4th gear boost, I did it for the reason above, I had no issues with the load flow as I haven't flogged the car hard yet, so I didn't even think about it. I just wanted that ridiculous instaventing to stop.

Modifying the STi's metal BPV was a pleasure. The same filtered 1/16" vent hole was used for the same reasons I've explained before. This, IMHO, is how this thing should work. No waiting for the valve to close, no spastic touch-me-not reaction to microscopic throttle inputs... more power instantly and smooth power during higher speed or in-corner throttle feathering. Couple that with far better load flow during shifting all the time. This is not a subtle improvement, to me, but a necessity.

There are a bunch of mods scattered across the years, this may be the best of all.
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Old 08-08-2011, 06:36 PM   #288
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I used M6x1 tap no drilling and made a set screw out of something in my junk drawer by cutting the head off to the length I needed and put a slot/screwdriver interface in it with my Dremel. $0
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Old 08-08-2011, 06:59 PM   #289
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bet yours doesn't look as sexy as mine.
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Old 08-09-2011, 09:19 AM   #290
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Very Interesting thread! Subscribed for future reference
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Old 08-09-2011, 12:52 PM   #291
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Hello All. I'm running a stock TD-04 and HAD a TurboXs BOV (venting at 21, I removed it because even after changing to Iridium Plugs and newer coilpacks, it rough idled, stalled, and ran crappier than before, plus the fuel system is filthy, cleaning of IACV and MAF in progress) on an '06 TMIC. The thing is, the car is an '03. So I found an original intercooler and put it back on and I have 2 stock BPV's coming. Running 21psi, should I Mod my BPV? (i'm thinking so,) I don't have a tap set, so I'm wondering what i could do besides crushing. Are the self tapping screws safe for use? will they perform as well as the others? Thanks - PM if you'd like or reply, whatever works. (note- the car came set to 21 by the previous owner. I'm trying to figure out how to turn it down with the AEM TRU-BOOST. Any help would be great.)

Last edited by Timmy_M2000; 09-12-2011 at 10:47 PM.
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Old 08-12-2011, 11:17 PM   #292
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Bump for previous...need info
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Old 08-13-2011, 07:01 PM   #293
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If you don't care about reversing the mod, Locite 2 part epoxy works great.

Don't crush it...
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Old 08-17-2011, 07:33 PM   #294
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I just performed this mod on my Stage II 2011 USDM STi (2.5 l motor). I did not need to hold any more than the 19.5-ish psi I run now, but I was intrigued by the drivability enhacments detailed by SeeeeeYa, several posts up.

All I can say is Wow! I followed the instructions of Mr. SeeeeeYa (1/16" filtered hole) and the improvement in drivability was instant and marked. Upshifts are easier and smoother, and the motor comes onto significant boost noticable quicker. I am not aware of any 'surge', so even if it exists, it cannot be very severe.

Thank-you, one and all (and especially the thread starter) for giving me the knowledge I needed to make this newest, very enjoyable mod to my car.

Frank


EDIT: I meant to mention that if you intend to perform this mod, and I certainly recommend that you do so, it is very straightforward. However, the springy clamp that holds the bypass hose to the bypass valve is of a variety that I had not previously encountered. For others unfamiliar with this variety of clamp, I want to point out that you need to pinch the two terminal ends of the clamp forcefully together and they will 'catch'. The clamp will then remain in the 'open' position, allowing you to easily slide it up and down the hose. When reassembling everything, you position the clamp where you want it and then 'release' the clamp by using a screwdriver to twist and to allow the two terminal ends to unlock. The clamp will then instantly grab the hose forcefully.

I had to remove the TMIC in order to have sufficient access to this particular clamp and hose. If you are more dexterous than I, you may not need to do this.

I am sorry, but I did not think to take photos of this clamp while I had it accessible.

Frank

Last edited by Frank_Zuccarini; 08-18-2011 at 09:16 AM. Reason: Added more info.
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Old 09-22-2011, 11:20 AM   #295
blue_wrx_chic03
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my brother did the same mod and then logged it and on his stage 2 LGT spec b it made 1 pound of boost more averaged and a little more then 1 psi on the spike.
Quote:
Originally Posted by Frank_Zuccarini View Post
I just performed this mod on my Stage II 2011 USDM STi (2.5 l motor). I did not need to hold any more than the 19.5-ish psi I run now, but I was intrigued by the drivability enhacments detailed by SeeeeeYa, several posts up.

All I can say is Wow! I followed the instructions of Mr. SeeeeeYa (1/16" filtered hole) and the improvement in drivability was instant and marked. Upshifts are easier and smoother, and the motor comes onto significant boost noticable quicker. I am not aware of any 'surge', so even if it exists, it cannot be very severe.

Thank-you, one and all (and especially the thread starter) for giving me the knowledge I needed to make this newest, very enjoyable mod to my car.

Frank


EDIT: I meant to mention that if you intend to perform this mod, and I certainly recommend that you do so, it is very straightforward. However, the springy clamp that holds the bypass hose to the bypass valve is of a variety that I had not previously encountered. For others unfamiliar with this variety of clamp, I want to point out that you need to pinch the two terminal ends of the clamp forcefully together and they will 'catch'. The clamp will then remain in the 'open' position, allowing you to easily slide it up and down the hose. When reassembling everything, you position the clamp where you want it and then 'release' the clamp by using a screwdriver to twist and to allow the two terminal ends to unlock. The clamp will then instantly grab the hose forcefully.

I had to remove the TMIC in order to have sufficient access to this particular clamp and hose. If you are more dexterous than I, you may not need to do this.

I am sorry, but I did not think to take photos of this clamp while I had it accessible.

Frank
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Old 09-24-2011, 07:36 PM   #296
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what will happen if we do the screw and dont drill the side of the body? and what is the purpose of drilling the side of the body for?
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Old 09-25-2011, 07:42 AM   #297
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to provide atmospheric reference instead of pre-tb reference.

you need the hole.
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Old 09-25-2011, 12:34 PM   #298
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im about to do this mod and when i drill the side of the body do i drill enough where i can see the through the hole where i block the bottom end and not anything pass that?
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Old 09-25-2011, 09:37 PM   #299
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i dont know what i did wrong but im boosting only 15ish? i cover the hole and drilled the body but doesnt go no where 22 psi ;(
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Old 09-26-2011, 01:15 AM   #300
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Quote:
Originally Posted by Krazematik
i dont know what i did wrong but im boosting only 15ish? i cover the hole and drilled the body but doesnt go no where 22 psi ;(
You didn't think this would up your boost to 22psi, did you?
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