Post #26
Mk2 RS cat looks promising.________________________________________
Ex- Phase 3 China GTi-6 T-Reg
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| Author | Subject: catalytic converter on a supercharged 306 |
 eliotrw
Seasoned Pro  Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
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 Posted 18th Feb 2013 at 13:30
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smegal
Seasoned Pro  Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #27
It is difficult as the way the 440cc injectors (quite a primitive injector) deliver the fuel (used to cool the pistons) means that unburnt fuel ends up on the cat at full throttle. There is a chance that even a standard cat will last that long. Should last longer than an aftermarket cat though.With the best will in the world, an aftermarket unit is never going to be built to the same standard as one built by a car manufacturer. This is why the scrap value of standard cats is much higher than the scrap value of an aftermarket unit. There are more precious metals in them. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 13:39
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #28
Yeah I think i'm going to look into the Focus RS mk2 ones to be honest. an photo of one on ebay looks doable at least.They can take a whack more than standard 300 hp too i believe. My mate had 345hp out of one and im certain it had its cat still ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 18th Feb 2013 at 13:43
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #29
Yeah, something like a Focus, Megane, Volvo, Mazda 3 MPS etc etc should do you. They should take the rich running on WOT well as the cars will do this as standard. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 14:43
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #30
RX-8 unit is worth a look too, it was specifically designed to cope with as much rich-running as possible.________________________________________ - 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 18th Feb 2013 at 14:49
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #31
phillipm wrote: RX-8 unit is worth a look too, it was specifically designed to cope with as much rich-running as possible. That may be a good shout, they do run super rich. There seem to be so many f**ked RX-8s about that you may get one for a good price too. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 18th Feb 2013 at 15:01
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #32
Hmmm quick look at one, Any ideas what the slight increase is in width after the first cat? Are there two cats in there?Looks a bit odd. ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 18th Feb 2013 at 15:19
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russbez
Seasoned Pro  Location: Inverness-Shire Registered: 19 Dec 2005 Posts: 7,459 Status: Offline |
Post #33
i am sure that this has been asked before but ..... would a Cat with the insides removed be restrictive?________________________________________ TEAM HIGH BOOST SUPERCHARGED RALLYEMy Rallye project thread |
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Posted 19th Feb 2013 at 15:18
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smegal
Seasoned Pro Location: Leeds Registered: 26 Dec 2005 Posts: 5,940 Status: Offline |
Post #34
russbez wrote: i am sure that this has been asked before but ..... would a Cat with the insides removed be restrictive? More restrictive than a decat less restrictive than a cat. There is an argument that in some applications a hollowed out cat can be more beneficial than a decat for a NA car. ________________________________________ Ex SC-6Now in a Megane R26 |
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Posted 19th Feb 2013 at 15:23
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russbez
Seasoned Pro Location: Inverness-Shire Registered: 19 Dec 2005 Posts: 7,459 Status: Offline |
Post #35
suppose that makes sense, insurance renewal up soon.... oh joy________________________________________ TEAM HIGH BOOST SUPERCHARGED RALLYEMy Rallye project thread |
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Posted 19th Feb 2013 at 15:26
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jamiek_uk2000
Seasoned Pro  Location: Llanelli Registered: 18 Apr 2009 Posts: 1,925 Status: Offline |
Post #36
smegal wrote: There is an argument that in some applications a hollowed out cat can be more beneficial than a decat for a NA car. I thought I heard that before but thought it couldn't be true, the only thing that made me think it may be possible was the expansion chamber you get on two stroke motocross bikes. I've no idea if it is the same principle, but it made sense to me. I am an idiot though ________________________________________ 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 19th Feb 2013 at 15:29
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #37
Similar principle, the box should be smaller than a hollowed out cat though, so it can often be worse, you could chop it down the middle and take some volume out though.________________________________________ - 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 19th Feb 2013 at 15:43
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doof
Regular  Location: nottingham Registered: 24 Nov 2007 Posts: 231 Status: Offline |
Post #38
Can anyone doing this be sure to post any results / pictures of their work back here? Very interested in doing this but won't have the money to do it for a while. I wonder how much it'd quieten things down. |
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Posted 20th Feb 2013 at 13:55
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #39
russbez wrote: i am sure that this has been asked before but ..... would a Cat with the insides removed be restrictive? I wonder if the Peugeot sport "Dummy" cat is hollowed out or straight through ?  Could be worth finding out for sure. Stainless too. ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 20th Feb 2013 at 14:24
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anth
Seasoned Pro  Location: Colchester Registered: 04 Apr 2006 Posts: 3,651 Status: Offline |
Post #40
Magnaflow are supposed to be ok people running well over 300hp the difference is that it's normally on a 3" turbo back system. if you increase bore size it would probably slow down the gas velocity might help. But then you'd need a manifold too, probably stick with a decat. |
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Posted 22nd Feb 2013 at 10:07
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eliotrw
Seasoned Pro Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #41
You should be ok with 2.5 still, It doesnt really work the same way as with a turbo.Obviously a rs cat will be a 3 inch bore anyway so you would have to weld something up to suit with that. to make it bit a 2.5" system ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 22nd Feb 2013 at 10:17
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lee_gti6
Seasoned Pro  Location: Kent Registered: 29 Jan 2005 Posts: 1,147 Status: Offline |
Post #42
I think i have decided to put the cat back on and see how things go. ________________________________________ Proud member of the Astor owners clubTeam Charged Swirl pot and silly boost kit for sale |
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Posted 23rd Feb 2013 at 19:27
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jimmyhackers
Seasoned Pro  Location: birmingham Registered: 14 Jun 2011 Posts: 1,144 Status: Offline |
Post #43
if your putting the cat back on to supress noise then get a bigger backbox silencer insteadif your putting the cat back on to pass fuel emmisions test bear with me....... i had a decat 1.4 306. as i expected it failed on emmissions. i asked the man to re-run the test with my bodge cheap ass jam jar coat hangar HHO cell on and it passed. amazed by this the garage man im guessing couldnt resist tinkering with it some more. with the result of filling my plastic inlet manifold with the gas before starting the engine. a small but noisey explosion resulted. turning my plastic inlet manifold into scattered peices. and i think he was put off of hho forever, despite its magical emmision reducing properties. ill probably get laughed at and called a kook (again) for this info but sod it, here goes. i do believe the emmisions were reduced due to two reasons. 1. reforming water/steam captures many gasses in the exhaust and in this aqueous state they are not picked up by the test sensor 2. the detontion speed of the hydrogen gas has allowed for a far more uniform combustion as it essentially speeds up the spread of flame from the spark tip. meaning the mixture ignites all at once more like a diesel engine instead of spreading as a wave. i will also note point 2 may be a reason for me noticing mpg increase over long motorway journeys. this effect was not seen on short city driving however. ________________________________________ the world is changed by people in sheds |
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Posted 25th Feb 2013 at 17:45
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #44
jimmyhackers wrote: if your putting the cat back on to supress noise then get a bigger backbox silencer instead if your putting the cat back on to pass fuel emmisions test bear with me....... i had a decat 1.4 306. as i expected it failed on emmissions. i asked the man to re-run the test with my bodge cheap ass jam jar coat hangar HHO cell on and it passed. amazed by this the garage man im guessing couldnt resist tinkering with it some more. with the result of filling my plastic inlet manifold with the gas before starting the engine. a small but noisey explosion resulted. turning my plastic inlet manifold into scattered peices. and i think he was put off of hho forever, despite its magical emmision reducing properties. ill probably get laughed at and called a kook (again) for this info but sod it, here goes. i do believe the emmisions were reduced due to two reasons. 1. reforming water/steam captures many gasses in the exhaust and in this aqueous state they are not picked up by the test sensor 2. the detontion speed of the hydrogen gas has allowed for a far more uniform combustion as it essentially speeds up the spread of flame from the spark tip. meaning the mixture ignites all at once more like a diesel engine instead of spreading as a wave. i will also note point 2 may be a reason for me noticing mpg increase over long motorway journeys. this effect was not seen on short city driving however. Pardon?  I think to be honest he is wanting to refit the catalytic converter to ensure the vehicle remains legal.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 25th Feb 2013 at 19:00
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #45
lmfao, not this HHO s**t again, or do I have to go through the calcs to prove you it was nothing to do with your system?Burns like a diesel does it? If it did, your pistons would be all over the floor  :________________________________________ - 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 25th Feb 2013 at 19:27
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stilly
Seasoned Pro  Location: kent Registered: 13 Mar 2004 Posts: 3,487 Status: Offline |
Post #46
stan_306gti6 wrote: I think to be honest he is wanting to refit the catalytic converter to ensure the vehicle remains legal. and because you have made a very paranoid person worst by filling his very empty head up with legals rubbish making him more paranoid than he already was..... ________________________________________ deaf in 1 eye blind in 1 ear ......307 136bhp daily drive..... 306 rallye stripped out and charged..... lee_gti6 also known as "the tit"..... stan_306gti6 also known as "stan the dick"....... |
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Posted 26th Feb 2013 at 05:00
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #47
Hardly, I still run a decat but I'm willing to take the risk. I think now Lee uses the car as an everyday car he wants it to be legal to avoid any future problems. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 26th Feb 2013 at 07:24
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heliosphan
Senior User  Location: UK Registered: 14 Sep 2007 Posts: 950 Status: Offline |
Post #48
 Misleading thread title. Reading 'Cat is on a charger', I clicked hoping to see a small furry pet sat on a super charger/battery charger/Dodge Charger. If the bible teaches us anything, it is to always remove an incorrectly used apostrophe. |
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Posted 26th Feb 2013 at 12:19
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russbez
Seasoned Pro Location: Inverness-Shire Registered: 19 Dec 2005 Posts: 7,459 Status: Offline |
Post #49
i thought this too, even though i only read and commented on this thread a week ago ________________________________________ TEAM HIGH BOOST SUPERCHARGED RALLYEMy Rallye project thread |
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Posted 26th Feb 2013 at 12:23
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lee_gti6
Seasoned Pro Location: Kent Registered: 29 Jan 2005 Posts: 1,147 Status: Offline |
Post #50
tompaltridge wrote: Misleading thread title. Reading 'Cat is on a charger', I clicked hoping to see a small furry pet sat on a super charger/battery charger/Dodge Charger. If the bible teaches us anything, it is to always remove an incorrectly used apostrophe. Hopefully i have sholved this problem ________________________________________ Proud member of the Astor owners clubTeam Charged Swirl pot and silly boost kit for sale |
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Posted 27th Feb 2013 at 18:14
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