flame from exhaust question

[rice]

hey guys, im puting this here since supras are turboed, anyways, i've heard that flames can come out of cars that has turbo through the exhaust pipe/muffler because of the unburnt air fuel mixture, is this correct? if not, how do flames come out from exhaust pipe? would you have to buy a kit or make ur own kit to install on ur car to make the flames? thanks in advance

[ahmedootie]

By flames do u mean 20 ft. flames? or a little flame that comes out when you backfire?

[rice]

Originally Posted by ahmedootie

By flames do u mean 20 ft. flames? or a little flame that comes out when you backfire?

little ones i guess......and i know u need to install a kit for the 20 ft flames

[ahmedootie]

well, your name explains the question ...ummm there are kits for backfires...but i'm pretty sure if you have enough power, you can pump out some little flames with sheer power

[Jeeves]

In some cars, it just happens. In turbo cars that vent their BOV to atmosphere, it's not unheard of because of how rich it'll run when you shift. Usually the flame is something like 1-4" long. Nothing to speak of really. You can buy kits, these add a spark plug to your exhaust, however, you have to run it rich enough to make it actually ignite and that can be harmful to the car.

I'd have to agree though, this is for "the fast and the furious" not for real cars.

[/rice]

[rice]

Originally Posted by Jeeves

In some cars, it just happens. In turbo cars that vent their BOV to atmosphere, it's not unheard of because of how rich it'll run when you shift. Usually the flame is something like 1-4" long. Nothing to speak of really. You can buy kits, these add a spark plug to your exhaust, however, you have to run it rich enough to make it actually ignite and that can be harmful to the car.

I'd have to agree though, this is for "the fast and the furious" not for real cars.

[/rice]

can you explain again why turboed cars creates flames from their exhaust again? thanks....

[Jeeves]

With a blow off valve that vents to atmosphere, the moment it vents it runs rich for about a half second. So, mid shift, if they are rich enough, some will spit a little flame out the tailpipe. It's not any green shooting flame like in The Fast and the Furious, it's just a little bit of rich gas being burnt up.

[farqy]

i thought it was called backfiring... i had a N/A nissan pulsar with a leaky throttle body that used to make big flames all the time!

no turbo required

[Wreckless]

It only happens to boosted cars running a mass-air system and using a blowoff valve that dumps to atmosphere. If you are MAP (aka speed density, via a VPC or using a factory MAP car like the JDM 1JZ-GTE) you will not have the probelm with running rich briefly after the BOV opens.
This is because the MAF/AFM has already metered the air that is getting dumped out of the blowoff valve but the ECU has already added fuel accordingly, so you are briefly rich.

Back when my '87T was MAF, and had turbo-back 80mm exhaust with no cats my record was about a meter long fireball from the exhaust. Usually it was less than a foot. Sometimes I still miss the flash in the rearview at night.

[lord lucan]

i had a ford cosworth that had flames coming out the back-but that was the carpet that caught fire after some welding in the boot.

[Jeeves]

Originally Posted by lord lucan

caught fire after some welding in the boot.

I don't know why, but as a USA-ian, that's just hilarious to read.

[BLUEMEANIE]

It's not only turboed cars (tho with modern cars its more common when they're turboed), its anything that runs rich enough.
My bike use to run rich at moments because of the carb jetting and back fire, I use to get a flame about 8" out the tail pipe. I had a friend who's Triumph TR6 would do it too.

[lord lucan]

ha ha ha...god TR6's...thats because the carbs were one step up from a 6" piece of fuel soaked string...those camping stoves you can get free with a tent have a better fuel/air system ..memories.

[Your Uncle Moe]

Dont Rally cars do that, Its called a Misfiring/anti-lag system and they run rich causing the fuel to ignite in the exhaust. If im forrect, the "exlposion" causes a vacuum that keeps the turbo spooling while u change gears giving u almost instant boost. This is hell on the car and can only be used for about 50MPH before destroying your exhaust and other parts.

Please correct me if Im wrong.......and I know someones gonna say this, but the black EVO from Initial D the movie had it. Also known as Anti-Lag System.

[Jeeves]

Originally Posted by Gridlyne

Dont Rally cars do that, Its called a Misfiring/anti-lag system and they run rich causing the fuel to ignite in the exhaust. If im forrect, the "exlposion" causes a vacuum that keeps the turbo spooling while u change gears giving u almost instant boost. This is hell on the car and can only be used for about 50MPH before destroying your exhaust and other parts.

Please correct me if Im wrong.......and I know someones gonna say this, but the black EVO from Initial D the movie had it. Also known as Anti-Lag System.

I know CERTAIN rally cars used to use this, I don't think they do much any more but I don't keep up on rally equipment.

In essence it was a bit a fuel and spark ignited on the hot side of the turbo to keep it spinning while you shifted. As far as I know, it was not an 'explosion' it was just a healthy enough dose to keep the turbine spinning. It wasn't a vacuum, it was an expulsion of gas which would then cause the turbine to keep some pressure in the intake system. As far as how much it could be used, I don't know. I don't think there would be any serious reprecussions as long as the components could take it (and I seriously doubt you meant to say MPH). Also, everything you see in movies (especially comics/anime) is not always correct, this include Initial-D.