Hi Guys, I have just fitted a colins dump valve to my 2007 wrx sti. Its already been mapped and has a down pipe fitted with just a 2.5 inc pipe. Since the dump has been fitted whenever a get to 4000 revs in 3rd gear there is an almighty bang/pop from the exhaust, is this normal?

 

Put the standard one back on IMO

 

Do yourself and your car a favour and go back to OEM.

And try doing a search on here for dump valve

 

+1 on the OEM valve, had a baileys one on mine changed it to the std one and the runs alot smoother

 

yes its normal, its the sound of your car running like S***.

get it on Ebay

 

i don't agree, sounds mint just a pop at 4000 revs cus of the new dump valve

 

^ hahaha ..... yeah mate, misfuelling sounds awesome! proper bo innit.

 

your better getting the car mapped for pops and bangs if you want that, or go the full hog and get anti Lag. over time the dump valve will make the car run bad.

 

Its been mapped, with down pipe

 

But not mapped for the dump valve.

 

and not mapped for 'pop and bangs'

 

But what F1 CJE UK was saying, was that if you wanted the pops and bangs, get them mapped in i.e. safe, as the pops and bangs at the minute are from your car misfuelling i.e. not safe.

 

thanks guys, i shall look into getting that sorted

 

I spoke to the performance garage just now who fitted it and they said its normal and not to worry

 

Mate, there is 1000's of years combined knowledge on this site, please take note mate before you end up with a bill for 0000's on a new engine. It should defo not pop and bang

 

until you tell your mapper to map in 'pop and bangs' deliberately (and safely)

 

Performance garage eh, sounds so much better than normal garage. Do they have a new engine for you when yours goes bang? As others have said, something is clearly not right, do yourself a favour and return it to a OEM dump valve, otherwise your next new thread could be 'my engines gone bang what should I do?'

 

 

Im from Crewe aswell and have to travel quite a way for a garage id trust .... who are you referring to?

Also, if your rattling around crewe, what does your car look like, i might have seen you.

 

Big lad, take heed of what is being said.

And quite simply, the person you spoke to in the garage is telling you lies.

 

I just fitted a bov to mine a couple of days before a health check from JGM. Mine is programmed for over run so pops only on down shift but other than that I was happy it was checked by a reputable mapper. Take the advice and get it checked.

 

It is normal they all run like $hit with them on

Is this the same garage that will be doing any repairs if/when it goes wrong, If so i think they might have a vested interest in it, As long as you can afford to fix it thats all that matters

 

(Spit's tea over keyboard and laughs loudly)

Whilst I am not a fan of the DV's, your garage need to check why it bangs at 4000pms, get it done now before a piston goes bang at 4000 rpms whilst on the motorway with all your bro's in the car 'innit!

 

Tell the garage you want that in writing and signed! lol

 

Waits for next thread about engine knock

 

why do newbs ask a question, then get answers and still ignore them and say "the garage says its ok"

well why start the fecking thread in the first place then???

 

Something is going to go pop and bang your wallet and i'm not talking about your exhaust.

Oh and performance garage, LMFAO.

 

Haha tubby that's what I was thinking! Asked for advice then basically ignores it! Mphlly get your car to a decent subaru garage and untill you can I would take DV off and put oem back on! Nobody on here is bs ing you carry on with silly fuelling problem and you will end up needing a new engine!

 

Waits for next thread about engine knock

 

It's a load of overfuelling that's causing the almighty bang. I bet the first time it happened you cacked yourself! It was probably akin to a gun firing. The end result if you leave it is apart from getting woeful mpg, you'll cause bore wash which doesn't really end happily.