anyone's exhaust spit flames?

FPenvy

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

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler

forza370z

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.

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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC

edub370

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.

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JARblue

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.

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forza370z

Hmmm, that sux. That's why our gas milage is only 17-21?? But anyways, in general if you add more breathe mods like CAI you will run leaner compare to the stock. And running lean is always more danger than running rich.

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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC

luigi90210

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