Welcome to the North American Subaru Impreza Owners Club Tuesday March 19, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FA Series Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 12-07-2017, 09:37 AM   #301
BOOMBA RACING
Former Vendor
 
Member#: 75640
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: 635 Wheat Lane, Wood Dale, IL
Vehicle:
2015 WRX
WRB

Default

4" of 5/32 vacuum hose should do the trick.
* Registered users of the site do not see these ads.
BOOMBA RACING is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 12-07-2017, 07:46 PM   #302
Harey
Scooby Specialist
 
Member#: 270569
Join Date: Jan 2011
Chapter/Region: International
Vehicle:
'15 Foz XT & GT86

Default

Quote:
Originally Posted by Mcooprr101 View Post
The flutter sound is due to the valve on the BPV opening and closing quickly. The BPV has a strong spring so it does that under load too. Correct me if I'm wrong anyone
Complete load of crap, it is compressor surge.
Harey is offline   Reply With Quote
Old 12-07-2017, 07:54 PM   #303
Harey
Scooby Specialist
 
Member#: 270569
Join Date: Jan 2011
Chapter/Region: International
Vehicle:
'15 Foz XT & GT86

Default

Quote:
Originally Posted by Wrondaxe View Post
Simply because the stock BPV is plastic doesn't mean it's garbage. I'm making 315 awp and 325 torque, with 35k miles. Holds 20# boost with no issues. If you want to spend money on a part that's not needed, there's always a company to sell you something. If people did more homework on how parts work and less time on what it's made out of, so much money would be saved! Car is driven roughly 100 miles daily, 5/days a week. Just my 2 cents but save your money on parts that actually help this car. Stock BPV is fine
Killer B Motorsports did some good testing on the stock bpv and recommended an aftermarket one. They dont sell them either.

Noone is saying that the stock bpv wont work but perhaps you would have more response and another 5-10hp/tq if you had an aftermarket one. (perhaps because the bpv is leaking boost back to the intake which means turbo has to work harder to make the same boost).

Only real way to prove this is a back to back dyno. Saying my car runs fine is not.
Harey is offline   Reply With Quote
Old 12-07-2017, 10:15 PM   #304
kpacker51
Scooby Newbie
 
Member#: 268581
Join Date: Dec 2010
Default

Quote:
Originally Posted by BOOMBA RACING View Post
4" of 5/32 vacuum hose should do the trick.
Thanks!
kpacker51 is offline   Reply With Quote
Old 12-26-2017, 11:33 AM   #305
BOOMBA RACING
Former Vendor
 
Member#: 75640
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: 635 Wheat Lane, Wood Dale, IL
Vehicle:
2015 WRX
WRB

Default

Quote:
Originally Posted by Harey View Post
Killer B Motorsports did some good testing on the stock bpv and recommended an aftermarket one. They dont sell them either.

Noone is saying that the stock bpv wont work but perhaps you would have more response and another 5-10hp/tq if you had an aftermarket one. (perhaps because the bpv is leaking boost back to the intake which means turbo has to work harder to make the same boost).

Only real way to prove this is a back to back dyno. Saying my car runs fine is not.
We created a video to demonstrate exactly what you're talking about:

BOOMBA RACING is offline   Reply With Quote
Old 06-21-2018, 07:48 PM   #306
F1EA
Scooby Specialist
 
Member#: 448622
Join Date: Jun 2016
Location: Vancouver, BC
Vehicle:
2019 STI SportTech
CWP

Default

So has it been defined/confirmed if the Boomba flutter is indeed compressor surge?
I find it hard to believe it isn't.....

Also, I guess there's some argument about stock OEM equipment being good enough to not need to look into aftermarket parts in some cases. But to be honest, in the case of Subaru, I personally think they go for "good enough". Yeah the OEM is ok, it's warrantiable too.... but is it the best? I wonder.

Personally, I don't think a company that would use that OEM handbrake boot material, the OEM battery, the thickness of the windows/windshield... or that grey trim on the steering wheel... is giving us the best of anything
F1EA is offline   Reply With Quote
Old 06-21-2018, 08:37 PM   #307
greygonzalez
Scooby Newbie
 
Member#: 461647
Join Date: Jan 2017
Location: Trinity, FL
Vehicle:
209 STI
ISM

Default

If you want to remove the fluttering or surging, look into Company23 EBCS. They have a v2 model that eliminated all their prior issues.
greygonzalez is offline   Reply With Quote
Old 06-21-2018, 08:48 PM   #308
Harey
Scooby Specialist
 
Member#: 270569
Join Date: Jan 2011
Chapter/Region: International
Vehicle:
'15 Foz XT & GT86

Default

From page 12:
"The stock bpv didnt start to leak. It is designed to bypass a small amout of air through it. By design."

I personally like the flutter/compressor surge noise at low boost. I have a turbosmart bpv with it set quite tight so that i get some flutter/compressor surge (at low boost only!).

I am not saying dont get the Boomba bpv because of it, Im just saying the excuse that its not flutter/compressor surge is garbage.
Harey is offline   Reply With Quote
Old 06-21-2018, 09:29 PM   #309
F1EA
Scooby Specialist
 
Member#: 448622
Join Date: Jun 2016
Location: Vancouver, BC
Vehicle:
2019 STI SportTech
CWP

Default

Quote:
Originally Posted by Harey View Post
From page 12:
"The stock bpv didnt start to leak. It is designed to bypass a small amout of air through it. By design."

I personally like the flutter/compressor surge noise at low boost. I have a turbosmart bpv with it set quite tight so that i get some flutter/compressor surge (at low boost only!).

I am not saying dont get the Boomba bpv because of it, Im just saying the excuse that its not flutter/compressor surge is garbage.
Yep, I realize the OEM valve is not "leaking". It is purposely designed to bypass some air... But regardless, I'm pretty sure the after market option are better in quality. If it were BMW or AMG you could argue that aftermarket has a harder time exceeding OEM quality... but on a subie... looks like it's pretty easy.

You still need a proper design though. And the way i see it, the Boomba is perhaps sacrificing long term reliability for a cool sound and immediate gains. Or maybe the surge is a total non-issue. I don't know, that's sort of what I wanted to ask to see if people have found out more about it....

The quality in the Boomba definitely looks top notch but, personally... I think the Perrin BPV is the best design+quality. It's expensive though, but I think I'm going with the Perrin BPV. Just debating whether I start those mods now or after winter (ie grab all the parts in winter and do a single install in spring).

Last edited by F1EA; 06-22-2018 at 01:41 AM.
F1EA is offline   Reply With Quote
Old 06-22-2018, 12:54 AM   #310
Harey
Scooby Specialist
 
Member#: 270569
Join Date: Jan 2011
Chapter/Region: International
Vehicle:
'15 Foz XT & GT86

Default

Quote:
Originally Posted by F1EA View Post
Yep, I realize the OEM valve is not "leaking". It is purposely designed to bypass some air... But regardless, I'm pretty sure the after market option are better in quality. If it were BMW or AMG you could argue that aftermarket has a harder time exceeding OEM quality... but on a subie... looks like it's pretty easy.
Although whether the oem bpv bypassing air is by design or not doesnt really change the fact that an aftermarket bpv will improve performance. That is personally why i upgraded, not just to improve on oem quality. If improving on oem quality is your goal then you would need to swap every part on the car.
Harey is offline   Reply With Quote
Old 06-22-2018, 12:35 PM   #311
F1EA
Scooby Specialist
 
Member#: 448622
Join Date: Jun 2016
Location: Vancouver, BC
Vehicle:
2019 STI SportTech
CWP

Default

Quote:
Originally Posted by Harey View Post
Although whether the oem bpv bypassing air is by design or not doesnt really change the fact that an aftermarket bpv will improve performance. That is personally why i upgraded, not just to improve on oem quality. If improving on oem quality is your goal then you would need to swap every part on the car.
hahahah
Yes, the idea is to at least not put in a part that's of WORSE quality than OEM. Mostly from some of the posts earlier in this thread about OEM being 'best'. I don't think this applies to Subaru. If we were talking AMG.... I think it's fair to assume aftermarket is not likely to be much or any better... but for Subaru... meh.

For sure, there's some performance gains in most of these parts... and like I said, the quality is there. The question is, if it's a better overall design than OEM.

Basically, if it improves performance while still keeping the durability of your other parts - I know most extra performance will mean potentially a bit less 'long-term reliability' but if this can be kept to a minimum (like... by not allowing unnecessary surge) that would be great.
F1EA is offline   Reply With Quote
Old 10-19-2021, 11:12 PM   #312
Dr33R
Scooby Newbie
 
Member#: 527005
Join Date: Oct 2021
Default

Quote:
Originally Posted by BOOMBA RACING View Post
4" of 5/32 vacuum hose should do the trick.
Hey Boomba, what if the small vacuum hose is too long and I cut it short of thr 4 inches..does it affect anything and if so why?
Dr33R is offline   Reply With Quote
Old 11-10-2021, 09:36 PM   #313
That_Boosted_Life
Scooby Newbie
 
Member#: 422693
Join Date: Jun 2015
Chapter/Region: Tri-State
Location: Buffalo,NY
Vehicle:
2016 WRX Premium
Lapis Blue Pearl

Default

been runing this valve for nearly 4 years and 40k miles. hard to believe it is compressor surge and would surely think i would have some sort of damage by now if it was

Only get the flutter when making low boost or partial throttle. Full throttle pulls when boost is fully built it makes more of a whoosh sound
That_Boosted_Life is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 04:40 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.