Welcome to the North American Subaru Impreza Owners Club Monday July 28, 2014
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 > Engine Management & Tuning

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 09-26-2012, 06:08 PM   #1
TalentWRX
Scooby Newbie
 
Member#: 301350
Join Date: Nov 2011
Chapter/Region: MAIC
Location: Chantilly, VA
Vehicle:
2012 WRX
Graphite Gray Metallic

Default Exhaust and Downpipe, Car backfires A LOT!

I recently did a 3 inch invidia down pipe, and invidia q300 on my 2012 WRX Sedan. The car also have a Turbo XS 50/50 BOV. I love the sound, I love the look. My question is, pretty much everytime I shift gears the car backfires, loud! Is it imparative that I get a tune? Why is the car doing this? Can it wait? Am I damaging something? If so what tune should I do. With just these mods im not at a stage 2, so someone please guide me from here.

Thomas
Stohlman Subaru
Vienna, VA
* Registered users of the site do not see these ads.
TalentWRX is offline   Reply With Quote
Old 09-26-2012, 06:09 PM   #2
Tiller35
Scooby Specialist
 
Member#: 217006
Join Date: Jul 2009
Chapter/Region: NESIC
Location: Westfield, MA
Vehicle:
2002 RS - Project
Haven't Painted it

Default

Yes you need a tune since you got a downpipe. Cobb accessport stage 2 tune would be fine
Tiller35 is offline   Reply With Quote
Old 09-26-2012, 06:48 PM   #3
jchafee
Scooby Specialist
 
Member#: 238453
Join Date: Feb 2010
Chapter/Region: NESIC
Location: CT
Vehicle:
05 05 WRX
Aspen White

Default

Quote:
Originally Posted by TalentWRX
I recently did a 3 inch invidia down pipe, and invidia q300 on my 2012 WRX Sedan. The car also have a Turbo XS 50/50 BOV. I love the sound, I love the look. My question is, pretty much everytime I shift gears the car backfires, loud! Is it imparative that I get a tune? Why is the car doing this? Can it wait? Am I damaging something? If so what tune should I do. With just these mods im not at a stage 2, so someone please guide me from here.

Thomas
Stohlman Subaru
Vienna, VA
Really dude? Really? I don't like to bash people. But you should learn to do some research before you buy or mod anything. There is a very good chance damage is already done. You have displayed so much ignorance that I don't know where to begin trying to straighten you out.
jchafee is offline   Reply With Quote
Old 09-26-2012, 06:57 PM   #4
Black94Snake
Scooby Specialist
 
Member#: 274499
Join Date: Feb 2011
Chapter/Region: NESIC
Location: RI
Vehicle:
2007 CGM VF'd WRX
12.70 @ 108.4mph

Default

Quote:
Originally Posted by TalentWRX View Post
I recently did a 3 inch invidia down pipe, and invidia q300 on my 2012 WRX Sedan. The car also have a Turbo XS 50/50 BOV. I love the sound, I love the look. My question is, pretty much everytime I shift gears the car backfires, loud! Is it imparative that I get a tune? Why is the car doing this? Can it wait? Am I damaging something? If so what tune should I do. With just these mods im not at a stage 2, so someone please guide me from here.

Thomas
Stohlman Subaru
Vienna, VA
Return your car to stock, sell it and give up...

you fail at Subaru!
Black94Snake is offline   Reply With Quote
Old 09-26-2012, 07:21 PM   #5
TalentWRX
Scooby Newbie
 
Member#: 301350
Join Date: Nov 2011
Chapter/Region: MAIC
Location: Chantilly, VA
Vehicle:
2012 WRX
Graphite Gray Metallic

Default

I appreciate the post from the one person who was not an ass. I appreciate your help.
TalentWRX is offline   Reply With Quote
Old 09-26-2012, 07:34 PM   #6
jchafee
Scooby Specialist
 
Member#: 238453
Join Date: Feb 2010
Chapter/Region: NESIC
Location: CT
Vehicle:
05 05 WRX
Aspen White

Default

Quote:
Originally Posted by TalentWRX
I appreciate the post from the one person who was not an ass. I appreciate your help.
If I came across as an ass i apologize. The fact of the matter is that this forum has such a wealth of knowledge concerning this this platform. The fact that you have done zero research on modifying your car speaks volumes. If you want someone to hold your hand here we go. Park your car, order a Cobb access port. It is a tool that plugs into your diagnostic port that allows you to flash maps. Download a stage 2 map for your car to it. Yea your car is stage "2". Follow the Cobb instructions very carefully. Flash it to your car. Now you can put your horse before your wagon and safely drive your car. If it's not already fubar. It just took me longer to type that than it would've for you to read the stickeys in the newbies and faqs sections.
jchafee is offline   Reply With Quote
Old 09-26-2012, 07:44 PM   #7
TalentWRX
Scooby Newbie
 
Member#: 301350
Join Date: Nov 2011
Chapter/Region: MAIC
Location: Chantilly, VA
Vehicle:
2012 WRX
Graphite Gray Metallic

Default

Well... The downpipe and exhaust were just installed about 5 hours ago... The car has been driven about.. .1 Miles since it was installed. I was told by numerous people that JUST a turbo back exhaust would be just fine. After driving the car for that .1 mile I noticed backfiring, which is why I asked. In my expierence, asking is the best result to get answers. I apologize for not reading the stickies. I sincerely do. But what are message boards for? To gain knowledge on a topic. I will do my best to go ahead and get an access port and get it taken car of.

Thank you for a reasonable answer and not calling me ignorant for asking a sincere question that I had.
TalentWRX is offline   Reply With Quote
Old 09-26-2012, 08:09 PM   #8
Black94Snake
Scooby Specialist
 
Member#: 274499
Join Date: Feb 2011
Chapter/Region: NESIC
Location: RI
Vehicle:
2007 CGM VF'd WRX
12.70 @ 108.4mph

Default

Quote:
Originally Posted by TalentWRX View Post
Well... The downpipe and exhaust were just installed about 5 hours ago... The car has been driven about.. .1 Miles since it was installed. I was told by numerous people that JUST a turbo back exhaust would be just fine. After driving the car for that .1 mile I noticed backfiring, which is why I asked. In my expierence, asking is the best result to get answers. I apologize for not reading the stickies. I sincerely do. But what are message boards for? To gain knowledge on a topic. I will do my best to go ahead and get an access port and get it taken car of.

Thank you for a reasonable answer and not calling me ignorant for asking a sincere question that I had.

be prepared to blow your engine. the 2012's are notorious for their garbage factory tune.

hence why I said, "return it to stock"
Black94Snake is offline   Reply With Quote
Old 09-26-2012, 08:45 PM   #9
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Quote:
Originally Posted by TalentWRX View Post
I was told by numerous people that JUST a turbo back exhaust would be just fine.
You obviously asked people that have no idea about modding Subaru's. Removing exhaust restrictions causes overboosting/spiking and generally boost creep. once colder weather hits it will be at it's worst. Any minute you will be getting some flashing dash lights and probably a P0244 and P0420 code.
quazimoto is offline   Reply With Quote
Old 10-01-2012, 01:00 PM   #10
cruz-in
Scooby Newbie
 
Member#: 228858
Join Date: Nov 2009
Chapter/Region: VIC
Location: Richmond
Vehicle:
2007 STI
WRB

Default

come on guys , chilll out. Everybody out there wasnt godly gifted with cars from the get go. Alot of us have done something that we shouldn't have done with our cars and i can say that im guilty of that too, But thats how i learned how to tinker with cars.

anyways , Thomas, flash to stage 2 or go back to oem.
cruz-in is offline   Reply With Quote
Old 10-01-2012, 09:36 PM   #11
bacalhau16
Scooby Newbie
 
Member#: 297565
Join Date: Oct 2011
Location: Dartmouth, MA
Vehicle:
2011 WRX hatch
Silver

Default

Quote:
Originally Posted by cruz-in
come on guys , chilll out. Everybody out there wasnt godly gifted with cars from the get go. Alot of us have done something that we shouldn't have done with our cars and i can say that im guilty of that too, But thats how i learned how to tinker with cars.

anyways , Thomas, flash to stage 2 or go back to oem.
The problem here is that many people modify their car, damage it, return it to stock, bring to dealership and try to claim ignorance. This makes it harder for people who do take care of their car to get proper warranty service.

Modding a car is great fun. Starting with a subaru though is a terrible idea if you do not research FIRST.
bacalhau16 is offline   Reply With Quote
Old 10-01-2012, 09:57 PM   #12
cornercase
Scooby Newbie
 
Member#: 306921
Join Date: Jan 2012
Chapter/Region: SCIC
Vehicle:
2004 WRX
Blue

Default

Well, I can't speak to the 2012s but my 2004 still backpops a little bit even after a retune, so you might still be able to hear a little noise on shifting, but it definitely sounds like you need to get that tune worked out before you break something. I've seen some pretty wild exhaust system failures from big backfires.
cornercase is offline   Reply With Quote
Old 10-02-2012, 09:12 AM   #13
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Quote:
Originally Posted by cruz-in View Post
come on guys , chilll out. Everybody out there wasnt godly gifted with cars from the get go. Alot of us have done something that we shouldn't have done with our cars and i can say that im guilty of that too, But thats how i learned how to tinker with cars.
In this day and age,with all the information in the world at your fingertips through the internet it's juts plain laziness not to research before modding.
quazimoto is offline   Reply With Quote
Old 10-02-2012, 10:46 PM   #14
coalslaw
Scooby Newbie
 
Member#: 324808
Join Date: Jul 2012
Chapter/Region: E. Canada
Location: Toronto, canada
Vehicle:
2006 IWL Stg2
OBP

Default

get a tune as soon as possible. for short while you should be OK. but keep in mind in the long run, you will be looking at something sorrowful like replacing your engine if you don't take it to a reputable tuner. Research is key. 95%theory learning before getting behind the wheel of a modded car, 5% driving in it.
coalslaw is offline   Reply With Quote
Old 10-03-2012, 08:35 PM   #15
Hellchaser
Scooby Newbie
 
Member#: 278263
Join Date: Mar 2011
Default

It's after fire dude, AFTERFIRE.

If it through your exhaust its AFTERFIRE
Through your intake its backfire.

If you would've researched that too you would've known.
If you change anything that alters the performance of your motor you should always get a tune.

You need to buy a Cobb Accessport, flash a stage II map ASAP and hope there isn't any permanent damage. There are noob threads to avoid situations just like this.
Sorry if I came off pretty douchey, but I couldn't think of any other way to say it.
Hellchaser is offline   Reply With Quote
Old 10-03-2012, 08:38 PM   #16
alva8193
*** Banned ***
 
Member#: 318755
Join Date: May 2012
Chapter/Region: South East
Location: Palm Beach!
Vehicle:
2012 Phatbotti Tuned

Default

LOL i was waiting on someone to correct him, if your car was backfiring you would be royally fcuked, afterfire is not so serious and my car after fired with every shift when i had my GFB BPV set to 50/50 now its back to recirc. Tune the car or stay completely out of boost until you do flash it.
alva8193 is offline   Reply With Quote
Old 10-07-2012, 02:41 AM   #17
aperson
Scooby Newbie
 
Member#: 273649
Join Date: Feb 2011
Chapter/Region: Tri-State
Vehicle:
2002 WRX Wagon
Silver

Default

The only WRX that is somewhat safe to go stage 2 on without a tune is are 02-03 and maybe 04 STi. Even then you'd me a lot safer and get better performance with a tune of some sort. If you plan on doing more to your car in the future keep this in mind: the tuners in your area may be more acquainted with Open Source tuning so do some research before you buy a Cobb AccessPort. I'd get whatever your local tuners are using.
aperson is offline   Reply With Quote
Old 10-07-2012, 04:58 PM   #18
ProfessWRX
Scooby Specialist
 
Member#: 323379
Join Date: Jun 2012
Vehicle:
06 WRX

Default

Quote:
Originally Posted by Hellchaser View Post
It's after fire dude, AFTERFIRE.

If it through your exhaust its AFTERFIRE
Through your intake its backfire.

If you would've researched that too you would've known.
If you change anything that alters the performance of your motor you should always get a tune.

You need to buy a Cobb Accessport, flash a stage II map ASAP and hope there isn't any permanent damage. There are noob threads to avoid situations just like this.
Sorry if I came off pretty douchey, but I couldn't think of any other way to say it.
Before you spout off "facts" and tell somebody they're ignorant maybe you should look up the actual definition of backfire and "afterfire."

You internet "geniuses" are ridiculous.
Backfire = in a REAL dictionary.
afterfire = not
ProfessWRX is offline   Reply With Quote
Old 10-12-2012, 11:36 PM   #19
tjdonovan
Scooby Newbie
 
Member#: 334417
Join Date: Oct 2012
Chapter/Region: South East
Vehicle:
02 impreza wrx
black blue pearl

Default

i have an 02 wrx if i were to put a turbo back exhaust on it ur saying it won't harm the engine but it won't give me the full power potential it could have? Also so nobody thinks i'm ignorant i have no want to do this before i get a tuner which i am currently looking for, for under 400 dollars; really it would be nice to find one for around 250-300 but i doubt that would happen
tjdonovan is offline   Reply With Quote
Old 10-13-2012, 07:53 AM   #20
Black94Snake
Scooby Specialist
 
Member#: 274499
Join Date: Feb 2011
Chapter/Region: NESIC
Location: RI
Vehicle:
2007 CGM VF'd WRX
12.70 @ 108.4mph

Default

Quote:
Originally Posted by tjdonovan
i have an 02 wrx if i were to put a turbo back exhaust on it ur saying it won't harm the engine but it won't give me the full power potential it could have? Also so nobody thinks i'm ignorant i have no want to do this before i get a tuner which i am currently looking for, for under 400 dollars; really it would be nice to find one for around 250-300 but i doubt that would happen
Accessports can be had for $300-$350. Just go look in the classified section. You can also get a open source tune... Usually for under $200.
Black94Snake is offline   Reply With Quote
Old 10-13-2012, 10:35 PM   #21
tjdonovan
Scooby Newbie
 
Member#: 334417
Join Date: Oct 2012
Chapter/Region: South East
Vehicle:
02 impreza wrx
black blue pearl

Default

what is an open source tune i've never heard of it?
tjdonovan is offline   Reply With Quote
Old 12-30-2012, 12:58 PM   #22
omar480
Scooby Newbie
 
Member#: 306580
Join Date: Jan 2012
Chapter/Region: SWIC
Location: Tempe, Arizona
Vehicle:
2011 WRX - Hatchback
Silver

Default Gfb Bov

my car started backfiring and sounded like a loud gunshot when i installed my GFB blow of valve, make sure you take it to your personal tuner to get that sorted out.
omar480 is offline   Reply With Quote
Old 12-30-2012, 01:11 PM   #23
WRXncrew
Scooby Newbie
 
Member#: 39970
Join Date: Jul 2003
Chapter/Region: BAIC
Location: San Jose, Ca
Vehicle:
2008 LGT Spec.B
Quartz Silver Metalic

Default

Sometimes disconnecting the battery and allowing the ECU to relearn with a DP can also help before getting the tune, at least that did when I had my '03 WRX before I got it tuned.
WRXncrew 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 10:22 PM.


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