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| Author | Subject: catalytic converter on a supercharged 306 |
 lee_gti6
Seasoned Pro  Location: Kent Registered: 29 Jan 2005 Posts: 1,147 Status: Offline |
Post #1
Think i have made a decision now to put my cat back on the 6, and was wondering if any other charger boys are running theirs with the cat and what they thought? ________________________________________ Proud member of the Astor owners clubTeam Charged Swirl pot and silly boost kit for sale |
 Posted 17th Feb 2013 at 10:46
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #2
The general consensus is if you want to loose 15-20 horses then go right ahead.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 17th Feb 2013 at 11:04
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eliotrw
Seasoned Pro  Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #3
They must be a way of fitting a larger cat or something at little cost..at the end of the day loads of charged cars have them from the factory. ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 17th Feb 2013 at 17:37
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davedgti6
Seasoned Pro  Location: whiston, prescot Registered: 28 May 2006 Posts: 1,651 Status: Offline |
Post #4
As said the Cat will rob you of some power, if you look at the inside of a cat its a wonder that the exhaust gases get through at all, I have just put mine back on for the Mot and makes the car quieter (and slower), took me an hour but I do have an easy removable Cat and Decat pipe, will take me an hour to swap for the de-cat pipe once it passes, as I have to only do this once a year it's no biggie,If your supercharged then De-cat is the way to go imo  ________________________________________ Team Supercharged Gti-6™ |
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Posted 17th Feb 2013 at 18:52
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JWP EFi
Turbo Legend!  Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #5
what about fitting a cat from a more powerful forced induction car, say a scooby or something.i would have thought this option would keep you legal but not rob you of as much power than the GTI6 cat. other than that you could fork out for one of those race cats |
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Posted 17th Feb 2013 at 20:20
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #6
Exactly, you could put a high flow sports cat on there and probably not loose much power, but nobody has done it ghost I know of, they just seem to put the standard one on come MOT time.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 17th Feb 2013 at 21:36
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #7
It's true enough what's been said but then again running a decat is illegal so you run the risk of being caught should a member of the authorities wish to check.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 17th Feb 2013 at 22:51
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #8
Fit 2 cats on a Y-pipe.________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 17th Feb 2013 at 22:52
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #9
Smegal tried it on his IIRC and it kept killing sports cats. ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 17th Feb 2013 at 22:53
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #10
stan_306gti6 wrote: It's true enough what's been said but then again running a decat is illegal so you run the risk of being caught should a member of the authorities wish to check. my standard gti has a decat and it does improve things but iv'e heard rumours of random check points in my area doing emissions tests, i would would rather have a cat than getting done for no insurance-no valid mot=no insurance Extreme worst case scenario but it can/does happen |
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Posted 17th Feb 2013 at 23:01
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #11
^^ This is what I was getting at.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 17th Feb 2013 at 23:19
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jamiek_uk2000
Seasoned Pro  Location: Llanelli Registered: 18 Apr 2009 Posts: 1,925 Status: Offline |
Post #12
I've heard of people 'knocking out' the internals of the CAT. I have no idea how they hell they did this, but then if anyone was to check the car it has a cat fitted, if you were to crash/claim on insurance, it would be there. Unless they physically cut it open after the crash which would be almost unheard of then you will be fine. I'm not sure what the effect on the exhaust flow would be though with the bulge where the CAT is/was________________________________________ 205 GTi Red - G939 RTU - Died!306 GTi 6 Diablo - Being resurrected! Project Thread Looking for: VTS P1 Rack PR1.2 16" |
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Posted 17th Feb 2013 at 23:25
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #13
Peugeot sport do a centre section with a dummy cat all in stainless.But as above i really cba for mot cat swaps. Im going to look into fitting a supra cat or something (insert name of reasonably powerful boosted affordable car here) ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 17th Feb 2013 at 23:30
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jamiek_uk2000
Seasoned Pro Location: Llanelli Registered: 18 Apr 2009 Posts: 1,925 Status: Offline |
Post #14
I change my CAT for MOT's  sA decat makes for much cleaner revs than with the CAT, plus you get the nice rasp that comes along with it. ________________________________________ 205 GTi Red - G939 RTU - Died!306 GTi 6 Diablo - Being resurrected! Project Thread Looking for: VTS P1 Rack PR1.2 16" |
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Posted 17th Feb 2013 at 23:34
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #15
scooby, evo etc. just watch out for shagged cats due to poor remaps |
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Posted 17th Feb 2013 at 23:36
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jamiek_uk2000
Seasoned Pro Location: Llanelli Registered: 18 Apr 2009 Posts: 1,925 Status: Offline |
Post #16
A bit off topic but while looking into this subject, on another forum they say that changing the steering wheel to an aftermarket one is an MOT failure. It says that any safety device that is fitted to the car should not be removed. "All airbags originally fitted must be present and not obviously defective" ________________________________________ 205 GTi Red - G939 RTU - Died!306 GTi 6 Diablo - Being resurrected! Project Thread Looking for: VTS P1 Rack PR1.2 16" |
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Posted 17th Feb 2013 at 23:40
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #17
Do we know what cats people have tried with superchargers so far???Off the top of my head theres hoffman an jetex ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 17th Feb 2013 at 23:42
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #18
eliotrw wrote: Do we know what cats people have tried with superchargers so far??? Off the top of my head theres hoffman an jetex post#6...there are free flowing cats that will allow for least power loss whilst still remaining legal/passing emmisions tests |
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Posted 18th Feb 2013 at 00:01
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #19
Yeah but theres the odd dispute about power loss and them killing the cats ( i presume because they are cheap)Would be interesting to find out how well a decent 200 cell cat of a decent width would work Jetex do 2.5" ones for 259 to 325hp. I would be tempted to try and get one welded in. I think the ultimate though would be to do a bit of research as to what jap turbo cars have cats of a 2.5 inch width and fit one from the car that takes the most power before needing a decat ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 18th Feb 2013 at 00:09
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anth
Seasoned Pro  Location: Colchester Registered: 04 Apr 2006 Posts: 3,651 Status: Offline |
Post #20
I think your find jetex is oe replacement it will just bolt directly to the manifold. Which is handy |
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Posted 18th Feb 2013 at 08:23
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #21
They do universal ones too though which will cater for more power ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 18th Feb 2013 at 10:07
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smegal
Seasoned Pro  Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #22
armzs16 wrote: Smegal tried it on his IIRC and it kept killing sports cats. Indeed it did. I would have the standard cat off a forced induction car with similar bhp welded in. Allescar also has a sports cat die. Both were universal cats from custom exhaust places. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 12:57
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #23
The Jetex one may be a good bet, but make sure that you adhere to the warranty T+C as I don't think any aftermarket unit will last. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 13:01
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #24
phillipm wrote: Fit 2 cats on a Y-pipe. This may also be a good call. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 13:02
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #25
smegal wrote: armzs16 wrote: Smegal tried it on his IIRC and it kept killing sports cats. Indeed it did. I would have the standard cat off a forced induction car with similar bhp welded in. Allescar also has a sports cat die. Both were universal cats from custom exhaust places. Hmm, I was going to go for one of the jetex 325hp universal 200 cell types but ultimately i thik youve just convinced me to find a single cat from a similar power turbo. So Turbo charged cars with 250HP+ and a cat that looks like it has a chance of fitting competition comments! As i'm not going to run a decat. Can't be arsed frankly. ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 18th Feb 2013 at 13:13
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