Exhaust Backfire

[Dalek995 0]

OK so, recently replaced my exhaust all the way from the CAT back with a powerflo stainless exhaust setup. The one issue I have now is that when I rev the engine and drop off the accelerator it does the following (please forgive the childish noise attempt!!)

 

Brrrrrruuuuummmmmm pop po-pop pop pop

Brrrrrruuuuummmmmm po po po pop pop pop

 

So to speak!! :oops:

 

Its quite sperradic in pattern - problem is that it does it while I drive and change gear also. Am I just being a tart with this - is this supposed to happen (I just dont ever remember it doing so before my exhaust issues).

 

Thanks for any input dudes and dudesses :? :)

[stevemac 0]

Can happen with some exhausts - just a charachteristic. Could also be that they haven't sealed the front pipe properly though.

[coullstar 0]

Yep, often happens when there is a small air leak. Check round the joints for carbon deposits.

Does it only do it when its hot?

[chrishill 0]

go on admit it, you thought it was cool for about half an hour, then it got annoying :lol: ;)

[stu h 0]

go on admit it, you thought it was cool for about half an hour, then it got annoying :lol: ;)

 

he he -so very true.

 

used to happen on my old 16v -mates used to say a little flame used to show. happended when you nailed it and let off the accelorator to change gear. that was a powerflow too

[ben16v 0]

overfuelling can cause this too i think

[Rossco 0]

Its decent, leave it alone. Flame it up large and show the fuds in shitboxes what a real car is like

[Dalek995 0]

There doesent seem to be any carbon deposits around the joins - however, yes she does do it more when warm and it seems to be getting worse in that today she was giving out one good pop whenever I changed from 4th to 3rd or even 3rd to 2nd.

 

Sometimes it gurgles quite nicely (and yes I admit - I have the odd accelerator stomp just to hear it - mainly at traffic lights) but other times I am a bit concerned that I should paint it yellow and stick New York, Paris, Peckham on the side!

 

Could it be something before the CAT then? Manifold seal or something like that?

 

Cheers

[coullstar 0]

Probably just over fuelling then. Whats you mpg like?

[Neil VR6 0]

Sounds like the exhaust is very free flowing and perhaps a bit to large bore or with too few silencers. n/a cars always do this is if you have a big bore exhaust. You may even be losing power over a standard system due to lack of back pressure. I doubt if Powerflow set their systems up with pulse tuning in mind to optimise power gain.

[Guest]

Mine has a flamethrower affect 8) not a pop and small flame..

[Riley 0]

yep gotta remember that powerflow systems arent tuned to the car like Neil g60 says.

 

ill never ever use powerflow again after my experiences,but i suppose it all depends on the fitter,oh they dont use 304 grade stainless either,after 2 years of hell mine actually fell off the car in rusty pieces. 8)

 

sorry,just thought id share my experience!

neil.

[Tempest 0]

The Powerflow on my Mk2 Storm Rocco does the same, but that's because I requested that effect. It got a wee bit worse ever since I fitted a Supersprint 4-2-1 branch manifold :oops: Definitely not suitable for an everyday car, but as my Storm no longer is an everyday car rather than a fun / weekend car, I don't mind at all.

 

I haven't noticed any power degradation on mine, tube bore is still oem size on my entire system.

 

Tempest

[Dalek995 0]

Cheers everyone for the suggestions - looks like I'm gonna have some fun with my powerflow exhaust over the next few months then!!

 

So long as she lasts the next six months (which I have no doubts she will) gonna take her off road then to do some work on her - got a polo standing by - its brown and its a 1 litre - let the good times roll!