$0.16 BOV mod

[Krazematik]

Originally Posted by XanRules

You didn't think this would up your boost to 22psi, did you?

actually i did why is everyone claiming they hitting 22 psi?

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[XanRules]

No, this mod allows the factory BOV to hold more than 22psi without leaking.

[jimbosv650]

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 ;(

I chuckled a bit.

[kleedzine]

noob question here

what is the original function of the small hole we are tapping?

[kleedzine]

Originally Posted by ride5000

to provide atmospheric reference instead of pre-tb reference.

you need the hole.

could you explain more?
I am about to perform the mod and I think I should know about what I am doing and how the mod changes on the original function.

[ride5000]

Originally Posted by kleedzine

could you explain more?
I am about to perform the mod and I think I should know about what I am doing and how the mod changes on the original function.

seriously, all of your questions have already been answered in this thread.

[kleedzine]

haha yes, it is. thanks for reminding me.

I got confused, as I read through whole 13 pages.

[Brock31]

Cripes! Why am I just learning about this?! Have I been under a rock?

I've been wondering for a long time why I can't hold 22 psi or more for very long on my 16g. This seems like a good route and an easy mod. that is also reversable as opposed to the "crush" method.

[imppu2001wrx]

I can confirm that JDM STi BPV can hold 32psi easily.

[Boost4life88]

DSM Dodge garage mod or tap the top of it with a hammer works really well. its worked for me and doesnt take skill and a lot of time to do it.

[pagan PL]

After about 2 months on this mod I will most likely get Forge BPV.
To much surge at 22psi on modded one and I like my brand new 18g-xt too much to let it be ruined by $0.16.

[SeeeeeYa]

Originally Posted by wojtesq

After about 2 months on this mod I will most likely get Forge BPV.
To much surge at 22psi on modded one and I like my brand new 18g-xt too much to let it be ruined by $0.16.

While I have not owned the Forge I hear it is a good BOV. Its adjustability allows for great tuning. However, there is a certain reality regarding that adjustability relative to the $0.16 mod... that is, once the Forge is adjusted to where optimum driveability is, it, too, will cause some surge. Search should reveal that.

The slight surge this mod "causes" is benign, easily avoidable through driving habits, and as far as I know has never led to a documented turbo failure. It's kind of like that saying about having your cake and eating it, too. Once you have a BOV/BPV adjusted/modded to hold optimum boost for great part-throttle response you have gone beyond the threshold where low-level surge can occur. Just the way it is.

I know better, for more than one reason, not to mash the throttle at low rpms in higher gears. By using the gears more properly to match engine performance to the road I get all the good from my modded BPV without any of the downsides. I suspect you will come to the same conclusion with your Forge, but after spending a lot more money and the time going through its tuning.

[ride5000]

fools and their money are soon parted

[Bansheeboy11]

Well I just finished this up, took me 15 minute's and costs me $.97

The car now holds a rock solid 18psi and tapers to 16psi exactly as I tuned it. If I roll on the throttle it works as it should, and quick shifts make it as if it never looses boost, very responsive! Also the transition from vacuum to boost seems to be smoother and quicker.

However, if I romp the throttle to the floor it'll rocket to 25psi and hit boost cut, every time. I'm trying to figure out a way around this, maybe some of you have an idea? I'm all stock 04 wrx, catless and a drop in filter. I'm going to check my wastegate arm and go over my boost control mapping to try and remedy this.

[Bansheeboy11]

Okay i found it, it ended up not being related to the bov mod at all. Theres a good amount of oil in my vacuum lines and intake, so i got back and checked the boost control solenoid lines and one came off, i cleaned it and put it back on, good as new.

Boost holds dead steady at 18psi, nice and smooth all the way through the powerband, thanks again!

[nate_fisher]

Thinking about doing this on my 2011 xt 4eat auto with a vf52 on e85 with the stock plastic bpv but i dont know if i need to or not? I am tuned to 23psi depending on the gear and hit target boost without any issues everytime. I get a little surge and faint whistling from the stock valve at higher boost but car runs perfect. Will i benifit from this mod at my boost level even though i dont have any problem hitting target boost?

[SeeeeeYa]

Less than a dollar in parts. Less than an hour of your time. That is all it takes to find out everything you want to know.

If you've read the thread you have also read the answer.

The benefits that come from this mod are particularly valuable on an automatic car.

The best part is, if for some unforseeable reason you aren't sure you like what the mod does, you can revert to OEM functioning even more quickly than you modded it.

However, I'd guess your OEM BPV is leaking, and has been tuned around to compensate... which means your tune may need adjusted to prevent overboosting.

[nate_fisher]

Just completed the mod took maybe 5 min very easy. I didnt notice a change still hitting boost target the same so i guess mine was working properly. I used a tap 1/4 20 for the bottom hole and plugged it with a 1/4 set screw with gold rtv on the threads. Used a 1/16 drill bit on the vein to open a small hole like i said very easy. I will drive some more tomorow to see how it feels more but just want to say good write up.

[nate_fisher]

Ok so i had some more drive time today with this mod and all seems good and i like the added vta noise but i have a couple questions. First is when i give part throttle and get into boost i get a whining noise only between 10-15psi not befor and not after as soon as i floor it all the way its gone and i hit 23psi no problem. Is that compressor surge or is it the bpv letting the excess air escape out the hole i drilled to limit boost? Second is when im at higher boost and i let off hard i get a backfire from the exhaust while it vents. Is this safe and normal for this mod?

[ride5000]

are you venting to atmosphere?

[nate_fisher]

no its hooked up to recirculate im just getting more of a noise from the mod

[ride5000]

the whining noise at full boost is just the turbo.

as far as afterfires on throttle lift, they can happen. best hypothesis i've heard is the massive blast of recirc air creates a blip in the mass airflow sensor via backflow which then causes a momentary rich spike. aftermarket turbo inlet tubes/elbows can exacerbate this effect.

[nate_fisher]

ok thanks

[legacydreamz]

I've read the entire thread, but just to clarify...

My stock bpv holds 23psi to redline with a 16g Blouch. This mod will improve driveability?

[Bansheeboy11]

It did on my car, stock ej20 with a catless exhaust. Vacuum/boost transitions and spool are improved a bit, as well as boost control at higher rpm.