Welcome to the North American Subaru Impreza Owners Club Wednesday July 30, 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 > Normally Aspirated 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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 03-28-2005, 12:35 AM   #1
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default 99rs shooting flames?

alright i have a 99rs and i have one of two things happening, afterfire(i hope), or a backfire (oh ****).

engine mods: injen cai, stromung catback

symptoms: when going to a stoplight that i know will turn green i blip the throttle when goign from say 3rd to 2nd. it has happened 5 times total in the year that i have had my intake/exhaust set up. there is loud pop that sounds like it's in the front-ish area of the car. i think it is a true backfire. is it possible for that to be? it is semi-throaty, and sounds like its in the engine bay but i could be wrong. i try not to make it happen

which one is it: ?

effects: if it is an afterfire i don't care, flames for me , but if it is a backfire, what will it do, how do i stop it?
* Registered users of the site do not see these ads.
static_rst is offline   Reply With Quote
Old 03-28-2005, 12:37 AM   #2
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

you can not pop flames without boost, your mods arent even that extensive

its just like a backfire but it is normal with us subarus and catbacks get used to it nothing is wrong, wait till headers you hear this everytime you rev or shift
piker28 is offline   Reply With Quote
Old 03-28-2005, 12:38 AM   #3
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

afterfire or backfire

mine gurgles and pops like no other i just hope its not in the intake
static_rst is offline   Reply With Quote
Old 03-28-2005, 12:43 AM   #4
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

its your exhaust man get used to it
piker28 is offline   Reply With Quote
Old 03-28-2005, 01:05 AM   #5
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

thats what everyone says but it really sound like its coming from the engine bay area
static_rst is offline   Reply With Quote
Old 03-28-2005, 02:04 AM   #6
Impretzle
Scooby Newbie
 
Member#: 74900
Join Date: Nov 2004
Location: Oakland, CA
Vehicle:
2008 STI
black

Default

First of all you can have flames without a turbo, your car just has to be catless and running rich, and maybe the timing changed...

Second, if its backfiring through the exhaust its nothign to worry about, through the intake however maybe theres something wrong with your timing. I would think your car would throw a code though. Maybe your timing belt skipped or something?
Impretzle is offline   Reply With Quote
Old 03-28-2005, 12:59 PM   #7
tora
Scooby Guru
 
Member#: 5851
Join Date: Apr 2001
Chapter/Region: VIC
Location: Vancouver
Vehicle:
09 Forester XT
+ NA Miata

Default

For those who think an N/A can't shoot flames.
Scroll down to the RX-7:
http://www.pdm-racing.com/news/news.html

And before you say, yeah, but an RX-7 is turbo.....well this one is not. It is sporting a built N/A 3-rotor. I've seen it shoot flames well over 6 feet long. The owner got the idle high until the header was cherry read, then continually blipped the throttle and it was a true flame show.
tora is offline   Reply With Quote
Old 03-28-2005, 01:01 PM   #8
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

just to let you all know i said it to him that it cant shoot flames because with his current mods i doubt hell ever shoot them, so i said what i said
piker28 is offline   Reply With Quote
Old 03-28-2005, 01:38 PM   #9
allsubaru83
Scooby Specialist
 
Member#: 60122
Join Date: Apr 2004
Chapter/Region: NWIC
Location: Tacoma
Vehicle:
2008 M5
Space Grey

Default

Quote:
Originally Posted by Impretzle
First of all you can have flames without a turbo, your car just has to be catless and running rich, and maybe the timing changed...

Second, if its backfiring through the exhaust its nothign to worry about, through the intake however maybe theres something wrong with your timing. I would think your car would throw a code though. Maybe your timing belt skipped or something?


N/A cars can shoot flames, my friend does all the time when mobben, on th second hand, does the sound seem like it is comming from teh intake, if so it just might be some carbon nuild up or something or extra fuel combsting, it hjappens when i am doubble clutchen too somethimes when comming to a stop, nothing to worry about...
allsubaru83 is offline   Reply With Quote
Old 03-28-2005, 01:50 PM   #10
Bobalouy
Scooby Specialist
 
Member#: 827
Join Date: Jan 2000
Chapter/Region: MAIC
Location: Bel Air, MD,USA
Vehicle:
99 2.5rs,BDP,
02 WRX wagon WRB

Default

static_rst - my 99rs did this also with intake, exhaust, and s-afc. Only a handfull of times over the year, but definatly not your regular downshift rumble. I never really though much for it other than it sounded cool, lol. Mine did it when I was rev matching also, but I could never reproduce it if I tried.

Anthony C
Bobalouy is offline   Reply With Quote
Old 03-28-2005, 04:28 PM   #11
ejicon
Scooby Guru
 
Member#: 2452
Join Date: Sep 2000
Chapter/Region: SCIC
Location: Burbank,California, USA
Vehicle:
08 2.5 WRX
WRB Mica

Default

i have this same issue.. Started before I started modding my car like crazy. I hear it in the front... around the driver side. Not really in the engine bay, but it's under there. Doesn't bug me, but when people are in my car, they think it's gonna blow. Does this everyday.. I can stop it by accelerating quickly after shifting which is bad, so I just let it be. I have a COBB CAI, Cobb Headers+high-flow cat, Lightened Pulley, Strumong Dual pipe catback, more but I can't think straight right now.. Let me know if anyone finds a cure. I tried changing my fuelfilter, didn't do a thing.. when I recharge my CAI, it stops for a while, than slightly comes back.. I doubt that's it though
ejicon is offline   Reply With Quote
Old 03-28-2005, 06:15 PM   #12
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

recharge my CAI???

what is that?

anyway, yeah its not the normal gurgling and popping that i know and love, but it just gets me on edge because it sounds like its closer to ther front, and when you think of an actual afterfire, tis behind you at that point. so i won't let it bother me unless it starts happening more.
static_rst is offline   Reply With Quote
Old 03-28-2005, 06:37 PM   #13
Caplin 2.5
Scooby Specialist
 
Member#: 71203
Join Date: Sep 2004
Location: SoCaL
Vehicle:
2005 2.5rs
Crystal Gray Metallic

Default

yea me too, i hear pop galore when im in neutral and rev..... i hate it.
Caplin 2.5 is offline   Reply With Quote
Old 03-28-2005, 09:14 PM   #14
Big_Hitter
Scooby Guru
 
Member#: 10831
Join Date: Oct 2001
Chapter/Region: TXIC
Location: Boise, ID
Vehicle:
2011 Ferd Ranger 4x4
2009 FXT Stage2

Default

schweet
Big_Hitter is offline   Reply With Quote
Old 03-29-2005, 10:27 AM   #15
isburns
Scooby Newbie
 
Member#: 57577
Join Date: Mar 2004
Chapter/Region: SWIC
Location: Tucson, AZ
Vehicle:
2000 RS Coupe
1990 PGT Legacy

Default

I've had this happen to me three times in the past week. What happened a week ago you ask? I put on my Cobb CAI. Everything else on the car (2000 RS) is stock. It happens when heel-toeing from fourth to third for me, though it might have been from third to second once. It doesn't happen when I just rev match for downshifts (because I just don't get off the gas), only when I get off the gas then back on quickly when braking and rev-matching. Haven't noticed it on the double clutch heel toes from second to first either.

I can't seem to reproduce on demand either, but its definately coming from under the hood and definately sounds like its coming from the intake, especially considering everything else is stock and the nature of the sound.

I'm hoping there isn't a big problem with this. It seems as if there were, it would be covered better or we would hear about the actual problems it causes. As it is, I've seen people post about this asking questions but no one can give conclusive evidence that it is bad.
isburns is offline   Reply With Quote
Old 03-29-2005, 11:04 AM   #16
Bobalouy
Scooby Specialist
 
Member#: 827
Join Date: Jan 2000
Chapter/Region: MAIC
Location: Bel Air, MD,USA
Vehicle:
99 2.5rs,BDP,
02 WRX wagon WRB

Default

Almost forgot here is a pic of my car doing it at an autox


I guess it would have been a flame if I didnt have cats, lol.

I revently put a stock 93 intake on my car and havent noticed it since.
Bobalouy is offline   Reply With Quote
Old 03-29-2005, 10:01 PM   #17
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

WOW, that looks horrible!!! i hope mine doesn't do that, lol. well if it is a little flame that coudln't tahts ok, but if not, that sucks ass cuz my car and your car would be fubar'd
static_rst is offline   Reply With Quote
Old 03-30-2005, 01:06 AM   #18
Slack
Scooby Specialist
 
Member#: 17548
Join Date: Apr 2002
Location: Atlanta, Ga
Default

Subaru's run a rich fuel mixture. What you're hearing is the unburned fuel hitting the hot exhaust manifold and igniting. All N/A Subaru's that I've seen/heard have done this. Mine does it all the time and it is perfectly normal. I love how it sounds.


Mick
Slack is offline   Reply With Quote
Old 03-30-2005, 09:42 AM   #19
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

cool. now the question is, if there was no cat, would it have a flame or a small flash?!?!?!
static_rst is offline   Reply With Quote
Old 03-30-2005, 10:21 AM   #20
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

Mine does it, and I've got a Borla SS. That this is quiet in comparison with pretty much everything else on the market, with exception to the Hush. I like the pop, it doesn't just happen on my Subie either, does it on my 911 too, but the 911's really sick.

David
doster82 is offline   Reply With Quote
Old 03-30-2005, 10:39 AM   #21
isburns
Scooby Newbie
 
Member#: 57577
Join Date: Mar 2004
Chapter/Region: SWIC
Location: Tucson, AZ
Vehicle:
2000 RS Coupe
1990 PGT Legacy

Default

slack-
If its the unburned fuel hitting the exhaust manifold, why does it sound so hollow and like its coming from the intake? Also, why would it appear after I put a CAI on and not before- I've heard the Cobb can actually lean out your fuel mixture though I have no evidence in front of me at the moment.

I'm not attempting to disagree with you, but I am curious to the answer to these questions if indeed its is unburnt fuel hitting the exhaust manifold, because it really does sound like its coming from the intake while I'm in the car. If this is the case, it seems a combination of aggressive driving to heat up the manifold combined with driving that makes the car run rich would reproduce this. With that in mind, what causes the engine to run rich so I can try and reproduce it?
isburns is offline   Reply With Quote
Old 03-30-2005, 02:11 PM   #22
reedodafreedo
Scooby Newbie
 
Member#: 67339
Join Date: Jul 2004
Location: Vancouver Wa
Vehicle:
1998 OBS
black

Default

static_rst u need to stop dreaming your car doesnt shoot flames and never will. if u want flames u need to start saving for a turbo
reedodafreedo is offline   Reply With Quote
Old 04-01-2005, 12:54 AM   #23
static_rst
Scooby Specialist
 
Member#: 50155
Join Date: Dec 2003
Default

^ no job, no money, no more mods
static_rst 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
backfiring and shooting flames. all-trubo [STi] Factory 2.5L Turbo Powertrain 11 07-22-2004 10:39 PM
Pics of Exhausts Shooting Flames.... ptsmalls Member's Car Gallery 31 06-03-2004 04:19 PM
Shooting flames! help! BlackSnake Factory 2.0L Turbo Powertrain 27 02-25-2004 02:26 AM
Help im shooting flames BlackSnake Newbies & FAQs 13 02-24-2004 08:49 AM
Shoot Flames from your tail pipe. Safe and Easy MY99 2.5GT Normally Aspirated Powertrain 16 07-21-2001 03:32 PM


All times are GMT -4. The time now is 01:32 AM.


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.