Welcome to the North American Subaru Impreza Owners Club Tuesday May 5, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-04-2013, 09:11 PM   #1
imdrax
Scooby Newbie
 
Member#: 197011
Join Date: Dec 2008
Chapter/Region: BAIC
Location: bayarea
Vehicle:
04 Forester XT

Default DIY Open Filter & Intake Shield

I was bored today so I decided to chop up my stock intake box, slap on a cone filter and make an intake shield for my FXT to make it a little louder with the VF43 I put on there. Took me about an hour, the only cost was the filter $25, the trash can was just laying around. Definitely noticed more intake noise right away, will see how it performs when I do some logged pulls later and make adjustments where needed.


* Registered users of the site do not see these ads.
imdrax is offline   Reply With Quote
Old 05-04-2013, 09:22 PM   #2
jrodm12
Scooby Newbie
 
Member#: 296705
Join Date: Oct 2011
Chapter/Region: NWIC
Location: Wa
Vehicle:
05 STI
Black

Default

Doing this will trow the maf scaling out of wack tho right?
jrodm12 is online now   Reply With Quote
Old 05-04-2013, 09:24 PM   #3
imdrax
Scooby Newbie
 
Member#: 197011
Join Date: Dec 2008
Chapter/Region: BAIC
Location: bayarea
Vehicle:
04 Forester XT

Default

Im inclined to say NO; I say that because im using the factory Maf housing at the factory Maf location.
imdrax is offline   Reply With Quote
Old 05-04-2013, 09:44 PM   #4
cowboy_Rob
Scooby Specialist
 
Member#: 194062
Join Date: Nov 2008
Chapter/Region: MAIC
Location: Camp Hill PA
Vehicle:
2003 Impreza WRX
PSM

Default

This definitely will have an effect on scaling. Even some drop in panel filters can have an effect. So don't be surprised if you throw a lean code soon and I recommend you get it retuned before you damage something expensive
cowboy_Rob is offline   Reply With Quote
Old 05-04-2013, 09:49 PM   #5
imdrax
Scooby Newbie
 
Member#: 197011
Join Date: Dec 2008
Chapter/Region: BAIC
Location: bayarea
Vehicle:
04 Forester XT

Default

I do all of my own tuning, I dont see this affecting much at all. My car is running vf43, 09 sti TMIC, walbro 255lph, 3" TBE. I cant say what would happen to a stock car so you may be right, but without changing the diameter of the maf, or the maf location I honestly cant see how it would throw a code unless these cars are THAT sensitive, and certainly the "scaling" of the Maf would not need to be changed because this setup utilized 100% factory parts.
imdrax is offline   Reply With Quote
Old 05-04-2013, 10:24 PM   #6
cowboy_Rob
Scooby Specialist
 
Member#: 194062
Join Date: Nov 2008
Chapter/Region: MAIC
Location: Camp Hill PA
Vehicle:
2003 Impreza WRX
PSM

Default

Yes these maf sensors are that sensitive. I could change mine just by rotating the maf housing.
Log your long and short term fuel trims at idle with your open filter then plug the stock lid on and log again and compare them. It may not be off far enough to have a huge effect but I guarantee that it is affecting it
cowboy_Rob is offline   Reply With Quote
Old 05-04-2013, 11:08 PM   #7
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

It's not only about changing location or orientation. Even a drop in filter WILL change MAF scaling.
HinshawWRX 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 09:49 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.