anyone's exhaust spit flames?

FPenvy · 06-05-2013, 09:10 AM

ART pipes

Boost_lee · 06-05-2013, 11:42 AM

Yep, art pipes

The flame was likely due to the lack of a tune at the time.

edub370 · 06-05-2013, 12:37 PM

Quote:

Originally Posted by Boost_lee

Yep, art pipes

The flame was likely due to the lack of a tune at the time.

damn... so this only happens in a lean condition.... that kinda sucks

FPenvy · 06-05-2013, 12:39 PM

Quote:

Originally Posted by edub370

damn... so this only happens in a lean condition.... that kinda sucks

lean wouldnt make sense. rich with excess fuel to burn makes sense.

forza370z · 06-05-2013, 02:31 PM

Quote:

Originally Posted by FPenvy

lean wouldnt make sense. rich with excess fuel to burn makes sense.

I think edub370 was right. Running lean will cause engine running hot and detonation thus might shot flame. Running rich will only left a lot of un-burnt fuel which is a mess.

edub370 · 06-05-2013, 02:35 PM

Quote:

Originally Posted by FPenvy

lean wouldnt make sense. rich with excess fuel to burn makes sense.

if you weren't tuned and your car had tons of breathing mods you were running lean. tuning will generally add more fuel into the mix to bring u back to stoich.

red6spd · 06-05-2013, 02:52 PM

I heard that if a N/A car is tuned properly it wont shoot flames... Anyone else here of this? My buddies 6spd TL use to shoot flames, he had every possible bolt-on mod for the car, no-cats but no tune at all.

Oh and what is the GoPro mounted to? Thinking about making a vid like this tonight.

Sh0velMan · 06-05-2013, 09:17 PM

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).

forza370z · 06-05-2013, 09:32 PM

Quote:

Originally Posted by Sh0velMan

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).

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

Sh0velMan · 06-05-2013, 09:40 PM

Quote:

Originally Posted by forza370z

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.

forza370z · 06-05-2013, 09:48 PM

Quote:

Originally Posted by Sh0velMan

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.

SouthArk370Z · 06-05-2013, 10:13 PM

Quote:

Originally Posted by Sh0velMan

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.

Leuz · 06-06-2013, 10:59 AM

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

FPenvy · 06-06-2013, 11:02 AM

Quote:

Originally Posted by Leuz

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

worst case go get this lol

Hot Licks Exhaust: Dual Exhaust Kit

Staples · 06-06-2013, 06:59 PM

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.

06-05-2013, 11:42 AM	#2 (permalink)
Boost_lee A True Z Fanatic Join Date: Feb 2009 Location: SATX Posts: 2,813 Drives: 09 370Z TT 6MT Rep Power: 31	Yep, art pipes The flame was likely due to the lack of a tune at the time. __________________ My TT Z

06-05-2013, 02:52 PM	#7 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,277 Drives: 2010 Z Coupe M6 SPT Rep Power: 23	I heard that if a N/A car is tuned properly it wont shoot flames... Anyone else here of this? My buddies 6spd TL use to shoot flames, he had every possible bolt-on mod for the car, no-cats but no tune at all. Oh and what is the GoPro mounted to? Thinking about making a vid like this tonight. Kingbaby likes this. __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time) Last edited by red6spd; 06-05-2013 at 02:54 PM.

06-05-2013, 09:17 PM	#8 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 22	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). luigi90210 likes this. __________________ Buy My Car! \| Build Thread Last edited by Sh0velMan; 06-05-2013 at 09:20 PM.

06-06-2013, 10:59 AM	#13 (permalink)
Leuz Track Member Join Date: Nov 2012 Location: NorCal Posts: 555 Drives: Bunny Rep Power: 15	Why did you open this thread?? Now I "NEED" my car to do that gosh Miguel70Z likes this. __________________ 2013 PW 370Z Touring+Sport, NAV Tint 35% side, 18% back \| RJM clutch pedal \| ZSpeed SS lines \| Stillen Gen3 CAI \| Fast Intentions HFC and TDX 12'' CF CBE \| UpRev

06-06-2013, 06:59 PM	#15 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 17	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. __________________ '08 Infiniti G37s - Forced Induction Fed

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