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Old 07-17-2005, 02:38 PM   #1
Jamestiggs
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Default New Exhaust System Please help!!

Hey all i am new i dont post alot. I just bought borla headers, high flow cat, stromung mid pipe and exhaust. Sounds great i had a professional mechanic install it. The thing backfires like crazy. sometimes on the shift mostly when i let off the gas and get back on it lighlty. only in the 1200 to 3000 rpm range. I called boxer 4 racing where i bought it and they said that it will do that. I was wondering if anyone else had this problem. What do u guys think i should do about this. Ohh yeah before i forget. This is for a 2002 2.5rs. Thanks guy
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Old 07-17-2005, 04:17 PM   #2
svek
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put a resonator in the midpipe. its going to quiet down your exhaust and make it less likely to backfire. can be done at a local muffler shop for very cheap
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Old 07-17-2005, 04:29 PM   #3
Handsdown
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yeah the 2.5rs likes it's fuel and always runs a little rich.

we here in the subaru community like to call them "rally burps"

it's going to do that, you can either put a resonator in the midpipe like svek said or you can put the stock catalytic converter back into the piping and that will quiet it down a lot.

i'll trade you exhaust systems if you can't take the rally burps
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Old 07-17-2005, 05:01 PM   #4
quest
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yup, i just got a headerback (brullen EL headers, hi-flow cat, custom midpipe, magnaflo moofler) installed and my car (2002 rs as well) pops and backfires occasionally when i let off the gas too.

it never does it on the shift though...at least, not that i've heard.
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Old 07-17-2005, 06:36 PM   #5
anonymous_wolf
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i just got headerback system (brullen and N1) and it pops like crazy, sometimes so loud it's like somebody's firing a gun...lol
my friend who has a full brullen headerback (which has 2 resonators) said he could make it back fire everything he shifts!
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Old 07-17-2005, 08:46 PM   #6
Caplin 2.5
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May I ask how long you've had this exhaust setup? If you haven't had it for more than a coupla weeks u might wanna give the ECU reset a try so it can learn the mods a little bit quicker. Take the neg battery cable off and pump the breaks a few times then reconnect let the car sit for a few minutes and let it idle for 10-15 minutes then take it out and cover the entire RPM range. It seemed to help me out alot i rarely get pops now. Spark plugs make a difference.

I think stock plugs dont ignite all the fuel in the cylinder and a little tiny amount might be goin into the exhaust and igniting there... this is one theory i've heard that makes sense to me so i just went and purchased spark plugs installed and it reduced my backfire quite a bit. Oh yea and resonators do help but im not a fan of quiet.

Last edited by Caplin 2.5; 07-17-2005 at 10:01 PM.
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Old 07-17-2005, 09:25 PM   #7
piker28
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i dont know where you guys get these things unless i just cant here em,

i hear there was a recall for the old ecus that they were to sensitive to A/F ratio changes so thats why they backfired so much
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Old 07-18-2005, 01:15 AM   #8
Handsdown
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Quote:
Originally Posted by Caplin 2.5
I think stock plugs dont ignite all the fuel in the cylinder and a little tiny amount might be goin into the exhaust and igniting there... this is one theory i've heard that makes sense to me so i just went and purchased spark plugs installed and it reduced my backfire quite a bit. Oh yea and resonators do help but im not a fan of quiet.
umm... think about it... a spark is a spark... it's going to be the a/f ratio and the electronic fuel injection that decides how much of it gets burnt. not the spark plug...

if your old spark plugs were corroded or inefficient that could have been a cause but let me tell you from my own experience, if you don't get OEM or OEM REPLACEMENT plugs you WILL end up regretting it.
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Old 07-18-2005, 03:52 PM   #9
Jamestiggs
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Hey guys thanks for the info. Yeah i called that place again they said there could be a small exhaust leak so i will put it up on a lift and check. Also how do you reset the ECU. Maybe that will help it cuz i have only had this done for like 2 weeks now. Thanks alot guys.

James
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Old 07-18-2005, 04:03 PM   #10
kaisersouse
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Quote:
Originally Posted by Jamestiggs
Hey guys thanks for the info. Yeah i called that place again they said there could be a small exhaust leak so i will put it up on a lift and check. Also how do you reset the ECU. Maybe that will help it cuz i have only had this done for like 2 weeks now. Thanks alot guys.

James
As posted above:

Take the neg battery cable off and pump the breaks a few times then reconnect let the car sit for a few minutes and let it idle for 10-15 minutes then take it out and cover the entire RPM range. It seemed to help me out alot i rarely get pops now.
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Old 07-18-2005, 09:29 PM   #11
piker28
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this is how i reset it cause im picky..

disconnect negative terminal on battery for like 30 mins(usually just do it and go watch a movie) come back and reconnect it then let it sit and idle for like 15mins or something i dunno till it warms up i say...

then go out and beat the living wee wee out of it haha
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Old 07-18-2005, 10:13 PM   #12
moogoob
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Quote:
Originally Posted by piker28
this is how i reset it cause im picky..

disconnect negative terminal on battery for like 30 mins(usually just do it and go watch a movie) come back and reconnect it then let it sit and idle for like 15mins or something i dunno till it warms up i say...

then go out and beat the living wee wee out of it haha
I do that, then turn off before touching gas at all, then restart and procede with the beating...
I look forward to the Pop between shifts
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Old 07-19-2005, 01:25 AM   #13
Kyle 2.5RS
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i have the brullen EL headers and brullen catback... pops like a mofo! I love it mosly while decelerating... especially at high RPM's.
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Old 07-19-2005, 08:54 AM   #14
zechsiw
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ya...once you release the gas for few sceond and step on gas again, you will get a pop.
I'm practicing to make the pop sound.
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