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New exhaust .... pops and bangs !
https://ukbeg.com/forum/viewtopic.php?f=8&t=14370		 Page 1 of 3
Author:  Matt James [ 07 May 2012 16:27 ]
Post subject:  New exhaust .... pops and bangs !
Fitted a new (well second hand) Stealth exhaust to my '08 Uly XT Saturday and all seems fine .. definitely sounds better and runs fine except for a lot of pops and bangs on the over run now. Should this sort itself out ? Do I need to do a TPS reset ? Different map ?
Author:  Adam [ 07 May 2012 16:30 ]
Post subject:  Re: New exhaust .... pops and bangs !
Air leak :?:
Author:  pash [ 07 May 2012 17:29 ]
Post subject:  Re: New exhaust .... pops and bangs !
As Adam says, check for air leaks, however they all do this unless you adjust the mixture when the throttle is closed.

The standard exhaust is very "long", so on the over run you don't suck air back through the exhaust as far.

You can attack it in two ways, either richen the mixture a tad (as you would increase the size of the slow running jet on a carb) or do what I do and pull the fuelling down by 20% at the TPS corresponding to closed throttle, down to about 2500rpm.
Author:  Digger [ 07 May 2012 17:54 ]
Post subject:  Re: New exhaust .... pops and bangs !
**creeps in to tech without being noticed *** ... or you could just leave it 8-) :yup:
Author:  Ash [ 07 May 2012 19:02 ]
Post subject:  Re: New exhaust .... pops and bangs !
:yt:

Mine used to pop and bang a good'un on overrun and I likes it!
Author:  Jill Brown [ 07 May 2012 22:50 ]
Post subject:  Re: New exhaust .... pops and bangs !
Ash wrote:
:yt:

Mine used to pop and bang a good'un on overrun and I likes it!



:yt: :dance:
Author:  Matt James [ 08 May 2012 07:51 ]
Post subject:  Re: New exhaust .... pops and bangs !
Cheers all ... air leaks where ? Considering how much effort it was to get on I don't think there's a gap at the header ;)
Author:  pash [ 08 May 2012 07:55 ]
Post subject:  Re: New exhaust .... pops and bangs !
If there is an air leak you will feel warm air being blown out. Put your hand near each joint.
Author:  gunter [ 08 May 2012 08:12 ]
Post subject:  Re: New exhaust .... pops and bangs !
I also think, that the stock exhaust has several chambers, which the aftermarket exhausts usually do not have, so every bang goes straight out then and is not muffled as with the stock one.
Author:  DaveH [ 08 May 2012 20:39 ]
Post subject:  Re: New exhaust .... pops and bangs !
I've got a stealth ( or as Maz like to call 'em chav pipes ) Ha Ha Ha. On my xb12
and yes they all do that, though it does it a lot less if you use super unleaded and preferably shell rather than tesco's though it does cost a tad more. Hope this helps
Author:  Foby [ 08 May 2012 21:15 ]
Post subject:  Re: New exhaust .... pops and bangs !
My 08 XT with full earlier year stainless system also pops on throttle overun is it doing any damage to the engine:?
Author:  Dannyboy [ 08 May 2012 21:39 ]
Post subject:  New exhaust .... pops and bangs !
Both mine pop on overrun XB9 with an Albert and the M1, I likes it :)
Author:  penknife [ 09 May 2012 20:55 ]
Post subject:  Re: New exhaust .... pops and bangs !
I've got a stealth on my xb12 ..it bangs and pop too...and i luv it.
Author:  Matt James [ 09 May 2012 22:49 ]
Post subject:  Re: New exhaust .... pops and bangs !
pash wrote:
As Adam says, check for air leaks, however they all do this unless you adjust the mixture when the throttle is closed.

The standard exhaust is very "long", so on the over run you don't suck air back through the exhaust as far.

You can attack it in two ways, either richen the mixture a tad (as you would increase the size of the slow running jet on a carb) or do what I do and pull the fuelling down by 20% at the TPS corresponding to closed throttle, down to about 2500rpm.


I will check for air leaks but it does sound as if it's par for the course .. this adjustment, is that via ECM Spy ? Fun as the pops and bangs are I could live without them
Author:  SimonD [ 14 May 2012 07:36 ]
Post subject:  Re: New exhaust .... pops and bangs !
My '09 with a '07 headers and a Remus (quiet baffles in) does this. I didn't like it at first but have got used to it. It is worse with the baffles removed. The oe exhaust used to pop and bang as well.... just more quietly!

Apart from the farting it runs much better with this exhaust set-up.
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