Welcome to the North American Subaru Impreza Owners Club Tuesday June 28, 2016
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L 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 04-01-2016, 04:05 PM   #1
ODB
Scooby Newbie
 
Member#: 419202
Join Date: Apr 2015
Chapter/Region: VIC
Location: BC Canada
Vehicle:
2002 Wrx

Default Catless up pipe without resistor?

Hey guys, I bought my car about a year ago and the previous owner told me he had removed the cat. I assumed he was talking about the up pipe cat since it's a popular mod but when I changed my downpipe a couple weeks ago I realized he had removed these cats. Now I'm unsure if the up has been done and worried about it possibly falling apart and being sucked into the turbo. The egt sensor is still plugged in with no resistor. I'm wondering if there is any other way to remove up pipe cats without using a resistor. Or if there is any other way to tell if it's been done without actually taking the pipe off and looking.
Thanks for the help
* Registered users of the site do not see these ads.
ODB is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-01-2016, 04:15 PM   #2
FastHackem
Scooby Newbie
 
Member#: 137009
Join Date: Jan 2007
Location: Richmond,TX
Vehicle:
2005 Impreza WRX
WR Blue

Default

You can remove the cat and utilize a tune to keep the CEL from appearing.
FastHackem is offline   Reply With Quote
Old 04-01-2016, 04:35 PM   #3
ODB
Scooby Newbie
 
Member#: 419202
Join Date: Apr 2015
Chapter/Region: VIC
Location: BC Canada
Vehicle:
2002 Wrx

Default

Before I got my accessport it was throwing a p0420 code but that was most likely due to the catless dp. No egt codes ever came up
ODB is offline   Reply With Quote
Old 04-01-2016, 05:54 PM   #4
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Should be obvious by looking if they are in place.
quazimoto is offline   Reply With Quote
Old 04-02-2016, 09:21 AM   #5
jft5001
Scooby Newbie
 
Member#: 437182
Join Date: Jan 2016
Default

Out of curiosity why would you not want to use a resistor? I replaced my uppipe with no cat and put a resistor in and it was easy and cheap and required no tuning. Been that way for over 1200 miles and no codes (I don't drive my wrx much. It's not my daily).

You should be able to look at the pipe and tell if it's stock with the egt in it.
jft5001 is offline   Reply With Quote
Old 04-03-2016, 08:09 PM   #6
ODB
Scooby Newbie
 
Member#: 419202
Join Date: Apr 2015
Chapter/Region: VIC
Location: BC Canada
Vehicle:
2002 Wrx

Default

I'm just trying to figure out if the guy who had the car before me removed the cat and somehow made it work without the use of a resistor. I don't want to have to go through the work and new gaskets just to find it has already been done. Looks like it probably does still have the cat in it though without any other CELs
ODB is offline   Reply With Quote
Old 04-04-2016, 12:42 PM   #7
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Maybe he had the ECU reflashed with a performance re-tune. Most performance reflashes will inhibit the DTC's involved with installing catless exhaust systems and up-pipe EGT sensors.
quazimoto is offline   Reply With Quote
Old 04-04-2016, 03:13 PM   #8
GK1707
Scooby Newbie
 
Member#: 373868
Join Date: Nov 2013
Chapter/Region: Tri-State
Location: Queens, NYC
Vehicle:
02 WRX
PSM

Default

Off topic question but relevant, if I delete the rear o2 sensor (plugged the bung) would that affect my tune at all?

Just installed a catless downpipe, o2 was seized in the old downpipe but the midpipe came with a plug bolt for the bung.

I will be flashing Cobb Stage 2 OTS tune on the ECU, and blocking all related CELs with the Cobb for inspection purposes, just wondering if the rear o2 is needed for anything tune related.
GK1707 is offline   Reply With Quote
Old 04-11-2016, 03:45 PM   #9
ODB
Scooby Newbie
 
Member#: 419202
Join Date: Apr 2015
Chapter/Region: VIC
Location: BC Canada
Vehicle:
2002 Wrx

Default

Ok I'm still a little stuck trying to figure out if this up pipe is catless or not. I uninstalled the accessport and drove around town for about half an hour and eventually got a check engine light, pulled over and scanned, got the p0420 code again (catless dp) but nothing to do with egts. I got home and let the car idle in my driveway for about 20 mins and didn't get any other codes. Now I've unplugged the egt plug and still not getting any codes. Wtf!?
ODB is offline   Reply With Quote
Old 04-12-2016, 10:06 AM   #10
monkeyposeur
Scooby Specialist
 
Member#: 333468
Join Date: Sep 2012
Chapter/Region: RMIC
Location: SLC, UT
Vehicle:
1993 SS
03 WRB GD 205/22T 20G-XT

Default

I had to drive around for at least 20-30 minutes before my EGT sensor code came on when I first installed a catless up pipe.

I'm used to opensource tuning, but can't you tell what codes are turned off with your AP?
monkeyposeur 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 04:58 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.