Nissan 370Z Forum - anyone's exhaust spit flames?

Nissan 370Z Forum (http://www.the370z.com/)

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- - anyone's exhaust spit flames? (http://www.the370z.com/intake-exhaust/72190-anyones-exhaust-spit-flames.html)

Quote:

Originally Posted by GaleForce (Post 2349518)

I would pay good money to see that.

:tiphat: There are at least several people on this forum who I know would enjoy it :tup:

^^ I will get first row.:rofl2:

Edit: As long as it's just a video clip not a live show.:bowrofl:

Lean won't cause flame. Rich will. (Within reason, you can be so rich that your EGTs are really low and thus external combustion won't happen) The hot fuel vapors meeting cool oxygen = burny burn.

That said, you usually see it in turbo applications where there's a spike in exhaust fuel content on up-shift due to boost fall off and the exhaust is really hot due to being turbo (naturally higher EGT, turbine heating exhaust gasses a little immediately off boost).

Quote:

Originally Posted by Sh0velMan (Post 2350022)

Well, after some research the anwser is both lean or rich will cause the backfire which leads to shotting flames out of the exhaust...

Quote:

Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. An overly lean air-fuel mixture (i.e. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a "misfire". The unburnt fuel then enters the exhaust system, where hot components can cause the fuel to ignite unpredictably. Alternatively, rich air-fuel mixtures (i.e. an overabundance of fuel) can result in incomplete combustion, again causing unburnt fuel to enter the exhaust system.

Back-fire - Wikipedia, the free encyclopedia

Quote:

Originally Posted by forza370z (Post 2350037)

Well, after some research the anwser is both lean or rich will cause the backfire which leads to shotting flames out of the exhaust...

Back-fire - Wikipedia, the free encyclopedia

That's true as well! I guess the afterburner looking flames like the video had can be a lean condition and the crazy flame thrower style flames could be rich... Meh. :)

Quote:

Originally Posted by Sh0velMan (Post 2350054)

That's true as well! I guess the afterburner looking flames like the video had can be a lean condition and the crazy flame thrower style flames could be rich... Meh. :)

The conclusion is we were both correct.:tup:

Quote:

Originally Posted by Sh0velMan (Post 2350054)

That's true as well! I guess the afterburner looking flames like the video had can be a lean condition and the crazy flame thrower style flames could be rich... Meh. :)

I'd say your guess is right. Most (if not all) hydrocarbons burn with a bluish-whiteish flame when in normal to lean conditions and burn yellowish-orangeish when rich.

Quote:

Originally Posted by JARblue (Post 2349372)

I don't think this is necessarily true because the car seems to come from Nissan already running incredibly rich (probably to account for the higher compression as well as idiots who use regular gas with lower octane). Even with my R2C intakes, my tuner said I was running outrageously rich.

if you were to straight pipe a stock 370z, it will spit flames because its super rich from the factory(heck if you listen for it, you can hear some popping on deceleration on a stock 370z sometimes but there are no flames because the exhaust has a cat, resonator, and muffler)

exhaust flames(aka backfire) comes from unburnt fuel passing through the exhaust and igniting inside the exhaust from the extreme heat

EDIT:
Just read through the entire thread, so it seems lean and rich will cause backfire, i never thought a lean condition would cause backfire
I learned something new today :)

Quote:

Originally Posted by FPenvy (Post 2347533)

someone hook up a gopro to mine. when i downshift at lights people back up and stay back sooooo maybe? i do hear plenty of gurgles and backfire when i'm driving so its possible?

People do that to me all the time, and i hear what sounds like a noise that would be made if flame was spitting out. Almost rally style

Quote:

Originally Posted by AlexRaymond19 (Post 2350665)

People do that to me all the time, and i hear what sounds like a noise that would be made if flame was spitting out. Almost rally style

like i wanna believe mine does but i'm pretty sure i'm on a good enough tune where i should not be running lean or rich enough to cause it but who knows.

Why did you open this thread?? Now I "NEED" my car to do that gosh :yum:

Quote:

Originally Posted by Leuz (Post 2350729)

Why did you open this thread?? Now I "NEED" my car to do that gosh :yum:

worst case go get this lol

Hot Licks Exhaust: Dual Exhaust Kit

https://fbcdn-sphotos-f-a.akamaihd.n...04814127_o.jpg

My car... sorry for the chitty quality. Reduce timing and/or add fuel and this is what you end up with :)

This is during a tuning session.

long time since last post but my car does na with fast intentions LTH and catback exhaust, stillen gen 3 intakes and ported manifold and tb, with uprev tune.