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Old 02-20-2001, 10:40 AM   #1
Die Civic
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Post Who else gets back fire with an Apex-i N1?

Curious if this is normal, I know we run rich, but I get backfire all the time, is it the exhaust or is my piping slapping the rear diff making this noise?
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Old 02-20-2001, 10:42 AM   #2
25psi
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I hear ocasional rare backfire from my Stoumlong.

I think it is normal.

Eugene
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Old 02-20-2001, 10:57 AM   #3
Michael
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backfiring is normal...
my N1 does the same too...
no problem with it what so ever....
dhouldn't worry too much about it...
laters
michael
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Old 02-20-2001, 10:58 AM   #4
bratmantlz
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Thumbs up

i will tell ya soon. i am getting one from imprezars.com N1 on my RS soo soon
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Old 02-20-2001, 11:12 AM   #5
Kcz
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What kind of gas do you use?
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Old 02-20-2001, 11:36 AM   #6
joostin420
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Question

are you sure that it is "backfiring," or is it a burbling type note when letting off the throttle/deceleration? i get the burbling sounds and it is pretty kewl i think.

justin
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Old 02-20-2001, 01:29 PM   #7
UCmego
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If I hear this question one more time I'll SCREAM! Damit!! DONT YOU PEOPLE GET IT! IT IS SUPPOSED TO BE THAT WAY! It is the back pressure from the engine....it sounds awesome and it is NOT a MALFUNCTION! DUH!
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Old 02-20-2001, 02:05 PM   #8
Strepto
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Post

I feel just like UCmego (just not so violent).

Another thing, have you guys ever actually heard REAL backfire!? It sounds like a gunshot!! Nothing like what you hear out of our exhausts (unless there is something wrong with the car of course)!!
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Old 02-20-2001, 02:24 PM   #9
bratmantlz
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aww cmon people he is just wondering if this is normal and is concerned. it may have been posted before but its always good to get a fresh perspective on things.
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Old 02-20-2001, 02:25 PM   #10
Die Civic
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Okay mister car gurus, you don't gotta be so cocky about it, like you were all born with this knowledge, this is why its a QUESTION!
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Old 02-20-2001, 02:32 PM   #11
stimpy
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Post

Lemme try and get technical here...

IIRC, the reason we are getting the burbling from a free flowing exhaust is because of the injector ontime. Because of the lower backpressure, the exhaust is clearing out faster and the engine able to move into the next stroke faster. The ECU is calibrated for a set fuel value based on certain criteria. Well since we have just changed that criteria with the exhaust, the ECU is no longer running all the correct numbers. You race up the tach, left off the gas to shift, the injectors put in a little too much fuel, and then on the next stroke you burn a little extra gas *insert burble sound here*. Or maybe it was the injectors pushing a little unburnt fuel down the exhaust. *shrug*

I think thats how that works, but its been awhile since I read about it, so I may be way off base here.

-Jon
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Old 02-20-2001, 02:36 PM   #12
jlyttle
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Hey UCmego...

Um, well...Settle Down, Beavis!
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Old 02-21-2001, 12:31 AM   #13
Michael
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okay..it not actual backfiring..
it just sound like it....
this only happen when you are slowing down..
lift throttle and you will hear the pop pop pop sound... or when you are down shifting at a high rpm...
sounds pretty nice if you ask me....
laters
michael
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Old 02-21-2001, 05:45 AM   #14
etam
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Stimpy, are you saying that once I reset the ECU and let it to learn the new exhaust flow, the backfire will be gone IF there is one.

That's what I hear from my car last night. Got new cat-back and reset ECU and less burbling sounds now.

etam
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Old 02-21-2001, 05:57 AM   #15
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I have an N1 catback and the only time i get backfire is when my 02 sensor went bad... Otherwise it makes burbling sounds on deceleration which is totaly normal.
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Old 02-21-2001, 08:42 AM   #16
Impy
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I have an N1 with a custom midpipe and it DUS give teh occasional backfire... when it decels itd go... vrooooom, blurp blurp blurp BANG... blurp blurp...
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Old 02-21-2001, 10:11 AM   #17
stimpy
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The burbling may be reduced after an ECU reset, but they will not be completely eliminated.
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Old 02-21-2001, 02:32 PM   #18
UCmego
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Have a Nice Day?


"Settle down Beavis?"

Hey MF, how bout you get an original insult? I get tired of the LAME AZZ comments on this board. If the questions get any more stupid, then we might as well call ourselves: www.honda-acura.net

Example:
1. Auto vs stick?
2. Can I put VTEC on my Subaru (this one is the worst! go to the general forum and see it)
3. What should my next mod be? (I like to answer this one with: "a brain")

It is stuff like this that gets me fired up. We need a forum with an intelligence/experience scale...if you're too young, too dumb...go to www.honda-acura.net.
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Old 02-21-2001, 08:32 PM   #19
Die Civic
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Then why don't you buy a honda, and become a member of the honda-club, and don't rag on hondas, are cars may be AWD, but i know some hondas that will eat your ride up, turbo'd or not. And YES, with curves on the road as well.
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Old 02-21-2001, 09:15 PM   #20
RidinLow
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Question

Not to add fuel to the fire, but what the hell are you guys talking about? Just read my above post, it's the only correct answer to the original question.
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Old 02-21-2001, 09:52 PM   #21
5 Door Man
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Man-o-man...I used to get that way when people asked me questions like that. You have to realize not everyone knows as much about Subarus, or cars in general, as you do and encourage them to continue their interest by NOT giving them a bad impression of other enthusiasts. They want to learn, for godsake, man!! Don't stifle them!!

"There's no such thing as a stupid question, only a stupid answer"
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Old 02-21-2001, 09:55 PM   #22
01 Black RS
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geez I think UCmego has PMDD... better get that checked out. Some people have basic questions that need to be answered don't knock em for it, I'm sure you don't know EVERYTHING.
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Old 02-21-2001, 11:07 PM   #23
edekker
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I donít know if itís just my car, but it had always burbled on deceleration (stock exhaust). Itís very muffled and subdued, but itís there.

I guess Iím going to have to expect that burbling to get a lot louder once the RalliSpec catback system gets installed.

Oh wellÖ

Ed.
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Old 02-22-2001, 12:49 AM   #24
etam
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Please excuse my limited knowledge (today is my second day of life with an aftermarket cat-back exhaust). Is SAFC going to help reduce burbling by optimizing the fuel curve?

etam

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Old 02-22-2001, 12:55 AM   #25
RidinLow
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It's not a backfire, it's the sound of the exhaust gases smacking each other in the unequal length headers.

Like Strepto said, if it was a real backfire, everybody would duck because it would sound like a very loud gunshot.

Leaning out the mixture won't help at all because it's not caused by a rich running condition.

If you do a search on this, you'll find that this has been discussed many times in more detail.
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