Flames from exhausts?

[Jonff]

What is it that actually causes this to happen?

Only asking because my mates 106 Gti does it regular and he doesn't know why either. It generally does it when he changes gear at high rpm, it makes a loud bang with a lick of flame from his tail pipe usually followed by a bit of black smoke.

He has said it runs rich so I presumed the flaming was due to unburnt fuel getting in to the exhaust and with the temp of the exhaust is what causes the fuel to ignite. That's just an assumption as I know my theory is probably well off the mark.

 

[Greeny.]

My old 106 Gti did this with just a Pugsport exhaust on!

 

[Fletcher]

I think you've just answered your question...

 

[Paul RN]

Un-burnt fuel reaching the exhaust as you've stated

 

[Riley!]

fuel

 

[Jonff]

I think you've just answered your question...

Lol. Oh well, at least I know I was correct then. By the way have you changed your wheel colour? Noticed your avatar or is it just a photoshop?

 

[Alastair.]

answeard your own question

 

[mickstoke]

my old gti did it when i put the de cat on.

 

[JCC]

It's common with VTS/106s once decatted.

 

[Eckascliovalver]

My old valver used to do it all the time. A massive pop followed by a blue flame about a foot long roll on the nova!

 

[WILLIE]

My 206 GTi did this soon as I got a decat. Mostly un-burnt fuel was my problem. a month later the baffles in my backbox turned to a state like mouldy waffles ,which made it worse... and smell.

 

[rich-6]

My 6 did it Mith the magnex and a decat, Sounded bloody great, YES I AM A CHILD lol

182s dont do it i take it decatted?

 

[Jonff]

My 6 did it Mith the magnex and a decat, Sounded bloody great, YES I AM A CHILD lol

182s dont do it i take it decatted?

Only seen Throttle Bodied RS's doing it, I've had mine decatted and all I got was the odd pop and bang now and then.

 

[sideways danny]

it's down to exhaust heat. you can map it in so the exhaust gets hot on the over-run, then a tap of the throttle throws some fuel in, and pop bang flame

 

[BenStanley]

it's down to exhaust heat. you can map it in so the exhaust gets hot on the over-run, then a tap of the throttle throws some fuel in, and pop bang flame

Ha mint am definatly getting this done :rasp:

 

[rob_clio197rs]

my 172 does it, started to ruin the paint on the bumper now tho but looks pretty cool when it happens, ive got decat and running cams

 

[sammyhale22]

I`m tempted to do a decat but it just seems alot of hassle for 5bhp, if that and if you get pulled by the fez which is highly likely considering the noise increase... your buggered.

 

[Greeny.]

I`m tempted to do a decat but it just seems alot of hassle for 5bhp, if that and if you get pulled by the fez which is highly likely considering the noise increase... your buggered.

I gained 5bhp and 1lb/ft of torque after removing my de-cat, same rollers used but I did also used a slightly different RSTuner map.

 

[KungFuSpaghetti]

flames are caused by ignition r****d

 

[Dan R]

Ha mint am definatly getting this done :rasp:

Its good..... for about a week!!! Trust me lol.
However it depends how much it does it

 

[Antony]

It's common with VTS/106s once decatted.

agreed . . . . . . my old gti did the same thing :evil:

 

[Monaco Sean]

agreed . . . . . . my old gti did the same thing :evil:

And my VTS

 

[Jonff]

Its good..... for about a week!!! Trust me lol.
However it depends how much it does it

I can imagine it gets annoying after a while, I know it would be for me personally and it would become tiresome having to replace the back box after it melted the baffles in it.

 

[st3ve]

Mine popped for the first time tonight and I wasn't even trying, was the other day lol, I'm not sure if it released a flame but the noise the zorst makes since getting the decat is immense.

It's not the figures, it's the noise imo, that's why I got mine. Sick of being overshadowed by them bloody RS's lol.

 

[SBV116]

And mine, popped so many flames it blew the end off the oxygen sensor! lol.

 

[bmh.01]

The 225 does it nicely when the exhausts hot on H&T downshifts, did it for england on vpower racing fuel at the ring (100+ ron I believe? cost enough!)

 

[Meek_racing]

I can imagine it gets annoying after a while, I know it would be for me personally and it would become tiresome having to replace the back box after it melted the baffles in it.

Had a ride in Dans car the other week and does sound nice! Mine burbles and has the odd pop when cold

 

[Adam 182]

Only seen Throttle Bodied RS's doing it, I've had mine decatted and all I got was the odd pop and bang now and then.

Mine does it decat... Supercharger....237bhp.....flame on

 

[DannyR]

I've been spitting some 6-10 footers out tonight. Had it on constant coming down for about 20-30 seconds too!

Decat/Supercharger etc...

 

[TimR26]

Wouldn't want to follow you closely, not that I'd keep up!

 

[Oldskoolbaby]

Im suprised vee's don't kick out any flames. Very short exhausts that get bloody hot.

 

[sideways danny]

Mine does it decat... Supercharger....237bhp.....flame on

I've been spitting some 6-10 footers out tonight. Had it on constant coming down for about 20-30 seconds too!

Decat/Supercharger etc...

MASSIVE ignition r****d = very hot exhaust

 

[Tucker]

massive N/A EGT's means you're a r****d

 

[Mike_182]

Who you lot calling a r****d?

 

[SymonSi84]

Stock Civic VTi without cat does it sometimes. My S13 (well with chip and a lot of overfueling) did it all the time when I was downshifting with tap on the gas or when you want to slow down. Sometimes it even frightened me. It's anoying when you see cops, try to downshift/slow down and it does BANG!

 

[K-Tec Racing]

the myth is you need alot of fuel (unless your exhaust is UBER hot) as fuel cools the exhaust down and stops the flames.

With the ignition retarded the flame is fired much later on in the cycle and with it not being used for power you will get pops. However too much r****d doesnt work either.

Add to this the EGT's that are caused by this very fact and when the fuel does collect you get a large bang or flame.

This is massively accentuated on the turbo (anti-lag) and it can be done on superchargers.

With the supercharger you are pressurising the air all the time, add some part throttle ignition r****d and a light throttle to let the air through and you have some enormous bang and flames......

(Although I am not sure extended use would be good for the exhaust valves)


Andy

 

[ashbrown]

it's down to exhaust heat. you can map it in so the exhaust gets hot on the over-run, then a tap of the throttle throws some fuel in, and pop bang flame

haha call me a child too but i want my 172 to do this, my mates astra vxr does it all the time! so what is the best way to make it happen?

 

[Dan]

Will just a yozza plus a decat get the odd pop on a 182??