2012IS250

do any of you know what the cause for the backfiring is? I'm running dual muffler deletes and an invidia mid pipe (stock intake and headers if anyone's wondering) but I still do not get any backfiring from my 250. My secondary cats, resonator, and mufflers are all gone. I really want backfire from my exhaust but I cannot seem to think of any way of how to get it. thanks!

Sceanzo

Unburnt fuel in the exhaust is ignited via heat.

You aren't running rich enough or you're EGTs aren't high enough. It not necessarily a good thing to back fire. Its not bad but because you aren't doing it doesn't mean anything is wrong.

Gville350

iTrader: (10)

If you want the greatness chance to backfire, do some WOT pulls when the motor is COLD from an overnight rest.

2012IS250

what's EGT?

Justin2JZ

Exhaust Gas Temp

flattire

Im with you on that 2012IS250, I have an m2 performance axle back with a resonator delete and i dont back fire at all. I really wish I did but no one on here really knows how to unless slap on some NO2 lol. Maybe i should try to delete my cats maybe that will work?

chi123

iTrader: (12)

I have an Invidia midpipe and muffler deletes. The car backfires like crazy when completely warmed up. I would just coast and when I lightly tap the gas again, it backfires loud almost sounding like a gunshot. I like it but hate when it happens at times. Sometimes I'm driving with someone next to me with their window open and it backfires and scares the crap out of them lol.

2012IS250

Nah I'm running invidia mid pipes (which replaces both secondary cats and resonator) with dual muffler deletes and it's only backfired like two times before when downshifting from second down into first. I still don't know how to get backfire, I've considered removing primary cats as well but I don't think that would be a good idea at all.

Really? Are you using stock piping? Because I have muffler deletes with the megan racing axle back system and I dont get backfire like at all. Not sure if the pipe size has anything to do with it.

DocFreud

got me the same setup a while ago. no backfire at all. i am sad now

idoke1

iTrader: (5)

I have backfire from time to time on my is350. Running custom 2.5 inch true dual full exhaust setup with no secondary cats to borla mufflers.

Sffd103

iTrader: (16)

Why would you want your to backfire? It running rich isn't good either. Sounds like nonsense and do you think it makes it sound fast? It's only a 250.

604GSE21

mine back fires sometimes with invidia mid-pipe and Greddy SP Elite axel back... used to have HKS Hi-power and thing back fires everytime i go near the throttle...

Gerb

I got it from my f sport exhaust anyone else? It only happens when i brake the popping sound Im really happy I got rid of my m2

DocFreud

why put people IS-F bumpers on their non Fs? because they like it.
but well yea, running too rich isn't good..

flattire

So does anyone have an m2 performance axle back and get any backfire? It would be awesome to know how to get a nice pop on downshifts =D