hey guys
have a JDM ITR swap done; with 2.5'' custom dual exhaust; high flow catco cat; jdm dc sports 4-1 header, aem cai, ngk wires and sparks
exhaust just installed; custom stainless with mangaflow mufflers.
getting slight backfire when i lift my foot off accelerator..
wondering if its the exhaust setup..or...?
how to most efficiently figure this out?

anyone in Cleveland, OH that could help..?

Peace

 

it's because you're running rich, which is understandable. tuning will get you the right fuel mixture.

 

surprising you're getting backfires with a cat even if the cat is an hi flow one.. It should block the fire...my friend are able to get a 1 foot long backfire with and old jetta 1988 only by installing a test pipe....

 

dual exhaust ???

 

yep dual exhaust..
seemed like a good idea at the time..
i'm hoping I can fix this problem..

i'll post a pic when i figure out how

 

Are you sure it's an actual backfire or is it just a gurgling sound? The gurgling sound is common with any type of higher flowing then stock cat back exhaust.

 

you can make pak! pak! pak !sounds without making flames out of your exhaust

 

If it makes the "pak pak" sound but only one "pak" is that still considered backfire and running rich? My car made that noise when it was stock with only a catback exhaust....

 

yea..only one 'pak' sound; no flames coming out or anything;
just the 'pak' sound when i lift my foot off the accelerator..
it is a custom built exhaust; could it be that its to much backpressure;
and bottle necking somewhere?
solutions? how to tune?

Thanks!

 

Check your TPS Voltage. I had a similar problem with my old Hondata Setup. Turns out the TPS Voltage was incorrect and everytime I let off the throttle, I got a put, put, put sound.

Now if I shift at redline, I get a huge fireball no matter what. Kinda cool, but I don't even get to see it, so what does it matter? LoL

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by len &raquo;</TD></TR><TR><TD CLASS="quote">
Now if I shift at redline, I get a huge fireball no matter what. Kinda cool, but I don't even get to see it, so what does it matter? LoL</TD></TR></TABLE>

you stunna

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by voltageGSR &raquo;</TD></TR><TR><TD CLASS="quote">... could it be that its to much backpressure; ...</TD></TR></TABLE>

Sounds similar to when I was running a 2 1/2" exhaust on my ITR, and it's most likely due to low backpressure.
All in all, not really much to worry about in my humble opinion.

 

still remember seeing a clip of a Teg backfired (literally) under a bridge (in motion), sounded awesome! (for sure nothing like plah plah plah sounded...) Anyone still have that clip?

 

but if you are doing like 1000 pak pak pak when releasing trottle check out your spark plugs, your probably need to change them soon... changed them on my R and the pak pak pak stopped...

 

backfires are awesome....when it is not your car...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BassBoy19 &raquo;</TD></TR><TR><TD CLASS="quote">but if you are doing like 1000 pak pak pak when releasing trottle check out your spark plugs, your probably need to change them soon... changed them on my R and the pak pak pak stopped...</TD></TR></TABLE>

changed them few days ago, "pak pak" is gone.

 

must try that..change sparks and wires for that matter...maybe that will fix the problem..
what sparks u guys recommend; denso irridium?
magnacor wires?
resonable priced place to buy both?

this forum is awesome..wish i found it before my swap!

 

usethe NGK oem replacement its alot less expensive than the stock denso's... and when your spark plugs needed to be changed sometimes it comes with a misfire check engine light like it is on my R right now...

 

my hatch backfires, and even shoots flames when i get on it. Running rich with no cat sucks