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 Posted: Sun Mar 20, 2011 5:40 pm |
 
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Joined: Feb 13, 2010
Posts: 126
Trade Rating: +1
Location: broughton astley, leicester
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anyone know how to de-cat an exhaust. ive got a 1.4 8v
cheers bullous206.
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| 206 lx, 1998, 1.4 8v, 16" nimrods, standard rear lights, cupra front splitter, also has new number plate styling, im feeling the euro style  (eventualy) | |
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Posted: Sun Mar 20, 2011 5:42 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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Waste of time you'll lose power and you'll more than likely fail the mot
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Posted: Sun Mar 20, 2011 5:42 pm |
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Joined: Jul 13, 2010
Posts: 1032
Trade Rating: +10
Location: sutton surrey/welwyn garden city
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Cut cat out, weld pipe in. Well I think it something like that anyway!
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| You never really learn to swear until you learn to drive | |
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Posted: Sun Mar 20, 2011 5:47 pm |
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Joined: Feb 13, 2010
Posts: 126
Trade Rating: +1
Location: broughton astley, leicester
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| Lee wrote: |
| Waste of time you'll lose power and you'll more than likely fail the mot |
rekon?  not too bothered about the mot its just had one  lol, will i really lose power?
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| 206 lx, 1998, 1.4 8v, 16" nimrods, standard rear lights, cupra front splitter, also has new number plate styling, im feeling the euro style (eventualy) | |
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Posted: Sun Mar 20, 2011 5:48 pm |
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Joined: Oct 16, 2010
Posts: 390
Trade Rating: +4
Location: oxford
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nah u buy a straight pipe rather than cut out and weld (best option imo) if you cut it out and weld you will probs weld back on p**sed and it will be a b***h to mess about with. and lees right itll fail an mot... really not worth it tbh
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| Smoothed & Clean or Nothing at all | |
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Posted: Sun Mar 20, 2011 5:48 pm |
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Joined: Feb 08, 2010
Posts: 5400
Trade Rating: +105
Location: Stafford
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| ukskater01 wrote: |
| Cut cat out, weld pipe in. Well I think it something like that anyway! |
Exactly, pretty hard how to do a how as you have to know what you are doing. Or if you have a decat pipe ready to go on you could fit that. But it's a b*****d fitting into the centre pipe, as well as removing the old one + getting it to fit without gas leakage.
I have a de cat purely because my cat compltely broke and rattled with a fair while till the MOT and it was a lot cheaper / easier to fit and weld a pipe on and just fit a second hand cat for the MOT then change back again.
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Posted: Sun Mar 20, 2011 5:53 pm |
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Joined: Sep 12, 2010
Posts: 1912
Trade Rating: +4
Location: Manchester
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| bullous206 wrote: |
| Lee wrote: |
| Waste of time you'll lose power and you'll more than likely fail the mot |
rekon? not too bothered about the mot its just had one lol, will i really lose power? |
What about next year? lol
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Posted: Sun Mar 20, 2011 5:57 pm |
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Joined: Jan 17, 2011
Posts: 83
Trade Rating: 0
Location: Belfast, Northern Ireland
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wat about a 4 branch manifold for a 1.4 8v i was thinkin of one lol
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Posted: Sun Mar 20, 2011 5:58 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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An NA needs the backpressure from the CAT
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Posted: Sun Mar 20, 2011 5:58 pm |
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Joined: Feb 25, 2011
Posts: 245
Trade Rating: +3
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removed
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Last edited by shellis on Sat Feb 04, 2012 10:51 am; edited 1 time in total
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Posted: Sun Mar 20, 2011 5:58 pm |
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Joined: Feb 13, 2010
Posts: 126
Trade Rating: +1
Location: broughton astley, leicester
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| Harry wrote: |
| ukskater01 wrote: |
| Cut cat out, weld pipe in. Well I think it something like that anyway! |
Exactly, pretty hard how to do a how as you have to know what you are doing. Or if you have a decat pipe ready to go on you could fit that. But it's a b*****d fitting into the centre pipe, as well as removing the old one + getting it to fit without gas leakage.
I have a de cat purely because my cat compltely broke and rattled with a fair while till the MOT and it was a lot cheaper / easier to fit and weld a pipe on and just fit a second hand cat for the MOT then change back again. |
what did it sound like when you de-catted it?
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| 206 lx, 1998, 1.4 8v, 16" nimrods, standard rear lights, cupra front splitter, also has new number plate styling, im feeling the euro style (eventualy) | |
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Posted: Sun Mar 20, 2011 5:59 pm |
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Joined: Feb 13, 2010
Posts: 126
Trade Rating: +1
Location: broughton astley, leicester
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| Antknee wrote: |
| bullous206 wrote: |
| Lee wrote: |
| Waste of time you'll lose power and you'll more than likely fail the mot |
rekon? not too bothered about the mot its just had one lol, will i really lose power? |
What about next year? lol |
ahha 106 gti!!!!!! 
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| 206 lx, 1998, 1.4 8v, 16" nimrods, standard rear lights, cupra front splitter, also has new number plate styling, im feeling the euro style (eventualy) | |
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Posted: Sun Mar 20, 2011 6:12 pm |
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Joined: Feb 07, 2010
Posts: 2360
Trade Rating: +3
Location: Sheffield/Chesterfield/Dronfield
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Unweld cat, reweld with straight pipe, done
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Posted: Sun Mar 20, 2011 6:13 pm |
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Joined: Mar 01, 2010
Posts: 515
Trade Rating: 0
Location: Nuneaton
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I have a decat and very happy with it.
"there's a lot of guff mumbled about backpressure, but what happens in a properly designed system is that the exhaust gas velocity is kept high enough to effectively 'pull' the last of the exhaust out of the cylinders and allow more clean air and fuel in for the next cycle.
If the pipe is too small, the exhaust gas won't be able to get out fast enough - think blowing through a straw - and the charge in the cylinder won't be cleared as well as it might.
If the pipe is too large, the exhaust gas will be travelling too slowly to create the 'pull'.
Trick is finding the balance between too large and too small. A catalytic converter will add resistance to flow, so a high flow sports cat or a decat with a correctly sized pipe can add a noticeable amount of power."
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| 206 1.6 16v, Nimrods, Full SP Kit, 3 Stage Valve Cut Head, 4-1 Manifold With Decat, Pug Sport Backbox, Vibe Speakers, HIDs In Projectors, DVD screens & Sub | |
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Posted: Sun Mar 20, 2011 6:41 pm |
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Joined: Feb 07, 2010
Posts: 585
Trade Rating: +2
Location: aberdeen
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| Lewis1304 wrote: |
I have a decat and very happy with it.
"there's a lot of guff mumbled about backpressure, but what happens in a properly designed system is that the exhaust gas velocity is kept high enough to effectively 'pull' the last of the exhaust out of the cylinders and allow more clean air and fuel in for the next cycle.
If the pipe is too small, the exhaust gas won't be able to get out fast enough - think blowing through a straw - and the charge in the cylinder won't be cleared as well as it might.
If the pipe is too large, the exhaust gas will be travelling too slowly to create the 'pull'.
Trick is finding the balance between too large and too small. A catalytic converter will add resistance to flow, so a high flow sports cat or a decat with a correctly sized pipe can add a noticeable amount of power." |
thats all very well, but by just putting in a decat, you ruin the way the exhaust is made to work, if its a whole system made for that purpose, then thats fair enough...
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