Welcome to the North American Subaru Impreza Owners Club Tuesday March 28, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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 01-26-2017, 04:31 PM   #1
rmarchigiani
Scooby Specialist
 
Member#: 164584
Join Date: Nov 2007
Chapter/Region: MAIC
Location: Virginia Beach, VA
Vehicle:
2004 WRB STi
2016 Jeep SRT Night White

Default Switching turbobacks, need to re-tune?

Hello everyone,

I currently have a 2004 STi tuned for a catless turbo back system. It has a Perrin divorced gutted DP done by the previous owner with catless HKS.

I want something louder so I was planning on switching to a divorced Invidia catless DP with Invidia N1 race. This gutted DP thing kinda bugs me and I'm not sure why, but I'd rather have a true catless system if I'm going to be going catless. I've heard gutted cats can create turbulence which makes the exhaust system less efficient. Plus there is a circumferential weld in the middle of the DP.

Would this switch require a new tune even though I'm going from one catless system to another? I guess the argument would be that every exhaust system probably flows differently. Im hoping not to re-tune, but wanted some opinions.

Thanks all.
* Registered users of the site do not see these ads.
rmarchigiani is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-26-2017, 06:44 PM   #2
relative4
Scooby Newbie
 
Member#: 203132
Join Date: Feb 2009
Default

If you're stock other than the turboback and running a Cobb stage 2, no problem. If your tune is custom, who knows.
relative4 is offline   Reply With Quote
Old 01-26-2017, 07:44 PM   #3
mrsaturn7085
Scooby Specialist
 
Member#: 375462
Join Date: Dec 2013
Location: Portland, OR
Vehicle:
2006 Impreza WRX STI
WR Blue

Default

You will not need to re-tune, no.
mrsaturn7085 is online now   Reply With Quote
Old 01-26-2017, 08:18 PM   #4
rmarchigiani
Scooby Specialist
 
Member#: 164584
Join Date: Nov 2007
Chapter/Region: MAIC
Location: Virginia Beach, VA
Vehicle:
2004 WRB STi
2016 Jeep SRT Night White

Default

Ok thanks guys. It's a custom tune for EL headers and catless exhaust. Stock turbo, stock intake and stock block.
rmarchigiani is offline   Reply With Quote
Old 01-27-2017, 12:04 PM   #5
Efi-Rob
Scooby Newbie
 
Member#: 461154
Join Date: Jan 2017
Chapter/Region: NESIC
Location: Ct
Default

you might want to send a quick data log to your tuner and have him look at it just as a precaution.
Efi-Rob is offline   Reply With Quote
Old 01-30-2017, 05:07 PM   #6
Zcypot
Scooby Newbie
 
Member#: 372777
Join Date: Nov 2013
Location: Compton, CA
Vehicle:
2014 WRX Sedan Lmtd
WRB

Default

I change my exhaust setup constantly trying to find a good note. I always go high flow to high flow, never have any issues. You can always reset the ECU learning just to be safe.
Zcypot 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 01:17 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.