[Help! Flames shooting out my exhaust??]

 evowrx said:

Itl be the fuel over run like boon was saying. G4 doesnt give a fck about your bov unless youre still running maf based.

cool. i just wanted to know just incase it was bad cause sparks were comming out one night. my mate said it was my extractors getting red hot nd its cleaning it out?

[Help! Flames shooting out my exhaust??]

 boon said:

Yeah, nah, if this was the case the cars would do it from standard.

It's down to the tune, and a propensity for Links to overfuel at certain points, plus if he's still running a MAF (not all Link setups are speed-density) it will be due to the atmo venting BOV.

im running a link g4 if that helps? it may just be the ****ty ssq style bov?

[Help! Flames shooting out my exhaust??]

 pixelplay said:

Its unburnt fuel getting burnt in the hot exhaust. Its normally caused by valve overlap which is where the exhaust valve is partially open and allow a little gas to escape, normally an exhaust is tuned so that the resonance in the exhaust pipe will push some of the unspent fuel back into the chamber, where it should be, before the valve fully closes. When the engine is running hard the gas flow is not as efficient as at lower revs so the fuel stays in the exhaust and gets burnt creating flames out the exhaust. Turbo exhausts tend to be more free flowing also so they are more prone to this at high revs.

Generally the more tuned your car is for performance the engine tolerances are smaller so this happens more during hard driving. As somebody said above if the cars running a little rich that will also cause it, the ECU will try to compensate for this but depending on the cars setup, sometimes it cant. It wont hurt your car if its rich but it will foul plugs and sensors if its like that for a long time. But since as it just happens when your going hard its probably not an issue.

Thanks for that extensive response! It backfires, and spits small flames if i change gears at like 3-4000rpm lazily?

[Help! Flames shooting out my exhaust??]

I dont run antilag, so you think its my link overrunning? is this bad for my engine or exhaust?

cheers for the help guys

[Help! Flames shooting out my exhaust??]

 boon said:

Have you got a venting blow-off valve? That'll do it.

Or a Link with lots of overrun

Burrrr pop pop crackle burrrrrrrrr.

I am running a Link G4 with a tune from gary capper. and yeah my BOV is venting to atmosphere, no cat full 3" straight exhaust.

could you please explain overunn?

[Fuel gauge issue]

Mines stuck on 3/4 tank. It moves up to just under full like once in a while but always drops down to 3/4. when my cars full tank or empty it doesnt move.

would like to know the reason too

[Help! Flames shooting out my exhaust??]

Hey guys, so I usually only fill up with BP 98 and I only get back fires when i change 1st-4th very lazily from 4000rpm?

About three times i've been up north, and needed gas but the only 98 octane fuel I could find was gull force pro 10% ethanol, so i've filled my tank 3x with this stuff.

Recently (last three nights) on the motorway, driving it hard, during gear shifts the exhaust would spit a longish flame , as i had people following me, they said i was shooting flames..

Is this bad for my car (engine)? Is this caused by the gull force pro since i've never shot flames before?

Cheers guys

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 STiNGR said:

Any of yous got ya badges floating round? I'm missing mine and am on the hunt for one.

do u need a pink one? i have a red and black winger subaru one too

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What do you guys reckon about the shaved grill?