| Author | Topic |
|---|
Location:
Melbourne
Registered:
May 2002
|
|
BACKFIRE!
|
Thu, 07 August 2003 03:00
|
 |
hi guys.. i am now the proud owner of an ae92 sx with a 20v blactop... my question is about the exhaust.. why, on high rpm changes, does the car backfire. its not a major BANG type backfire, more of a crackle which happens a few times in a second.
what is causing this? how can i fix it?
thanks!
|
|
|
I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Thu, 07 August 2003 05:44
|
|
does it have an a/m exhaust?
lots of cars with big exhausts crackle and pop on gear change
(dont know why tho)
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Thu, 07 August 2003 08:27
|
|
yeh.. 2.5 inch i think...
u think i need to go down to 2.25" to stop it?
|
|
|
Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
|
|
Re: BACKFIRE!
|
Thu, 07 August 2003 08:33
|
|
usually from pulling air/fuel thru the chamber and igniting in the exhaust. is it running rich? do you have a cat? (excess fuel and cat=bad), stock or aftermarket ECU?
sound slike it needs a bit more decel fuel cut.
Cya, Stewart
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Thu, 07 August 2003 15:05
|
|
yes 2 cat... and no to aftermarket ecu
what r my options?
|
|
|
Location:
Brisbane
Registered:
June 2003
|
|
Re: BACKFIRE!
|
Fri, 08 August 2003 01:48
|
|
2.5 inch pipe seems excessive, you'd be losing quite alot of of your low band power, and as it reaches high band the large pipe diametre cause a baffle, the crackle which you here...
2.5inch without known tip diameter + 2x Cats would significantly root exhaust flow...
Most likely also has an improved air filter or not ?
As for your solution, try having your A/F tuned to the correct mixture considering any aftermarkets parts. If you wanted to solve the problem permanetly have a 2 1/4 or 2 inch pipe fitted unless you plan to majorly increase your power levels.
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Fri, 08 August 2003 08:29
|
|
yeh i thort 2.5" was a little large. i am gettin another resonator put on on wed so i will speak to te "experts" about it then..
cheers
|
|
|
Location:
Canberra
Registered:
July 2003
|
|
Re: BACKFIRE!
|
Fri, 08 August 2003 18:00
|
|
Why is this a problem?
I get foot long flames out of the trueno when off throttle at high RPM.
Wouldn't have it any other way 
|
|
|
Location:
Melbourne
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Sat, 09 August 2003 03:29
|
|
|
its a prob coe of the MAJOR flat spot i have between 2800 and 3300rpm... also i dun really wanna attract the police attention any more than it already does..
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Sat, 09 August 2003 03:32
|
|
yeah its not backfire
as Draven said most cars with a/m exhausts crackle a bit when letting off the gas
it doesnt matter at all
i think its got something to do with pressure changing in the exhaust
and yes 2.5 is too big for a GE
Ta
Mani
|
|
|
Location:
Montrose, VIC
Registered:
May 2002
|
|
Re: BACKFIRE!
|
Sat, 09 August 2003 06:30
|
|
|
If you've got a serious flat spot, then it's probably due to another issue, that is also causing the backfiring. Maybe your air flow meter is crook?
|
|
|
