Cats & Decats
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@6f443adb7c=blackmexyv6:
I can clearly see inside at what appears to be 'catalyst cell'??? as the engine is on a dolly i have peeked up both down pipe connection flanges to see the same cell on both manifolds
Thats interesting, so if I have read that right there are 2 cats (1 for each bank)
Edit : alsoooooo, does anyone know the standard bore of the main cat, it it 2"?
Cheers, :)
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Correct, well sort of, there would be three in total, one in each manifold, and a third where they join at the 'Y' branch down stream. WHY, THATS STRANGE?
Tonight I decided to remove one of manifolds and inspect closer, it has the look of a 'catalyst cell' but it doesnt see to be 'coated' with a catalising coating, I think they are restrictions or possibly 'flame traps' installed to increase temperatures at the location of the O2 sensors as they work in this small 'campartment' between the exhaust valves and the rolled up mesh that I may have mistaken for a catalyst cell????.
I hope someone can inform or correct me on this matter :oops: just out of interest really! kev b.
PS ; If I get chance, i will take and upload a pic of said items?
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Just popped out to garage, my '96' cat bore is 55mm (2 and 1/8th inch old school ) internal diameter. :D kev b.
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@1896154ba0=blackmexyv6:
Just popped out to garage, my '96' cat bore is 55mm (2 and 1/8th inch old school ) internal diameter. :D kev b.
Excelant thank you! :cheers:
Might as well go 2.5" if doing a system I recon :D
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@c30be710ce=blackmexyv6:
Tonight I decided to remove one of manifolds and inspect closer, it has the look of a 'catalyst cell' but it doesnt see to be 'coated' with a catalising coating, I think they are restrictions or possibly 'flame traps' installed to increase temperatures at the location of the O2 sensors as they work in this small 'campartment' between the exhaust valves and the rolled up mesh that I may have mistaken for a catalyst cell????.
Yeah strange indeed, I know the Toyota MRS has pre-cats in the manifold but Mazda are usually a fan of having them in the downpipe.
Kinda hope they are cats really as you can still remove them for less restriction and still have a cat!
@c30be710ce=blackmexyv6:
PS ; If I get chance, i will take and upload a pic of said items?
Awesome, will be good to see what it all looks like :)
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Further internet trawling has uncovered that the 'BULBBUS' manifold cats, are 'CALIFORNIAN', they are '3 WAY, WARM UP CATALYTICAL CONVERTERS' so there you go!!! As they are made of a rolled up mesh affair, there is quite a large central hole in the middle of each cell? I would guess too that they rob about 3 bhp each??????? :shock: If I ever have to swap over engines, I will be swapping manifolds too? :o
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Ricco, do you have the slim-line manifolds (O2 sensor in-line with manifold) as I do on my current mexy? as they have 'NO' cats in them?
Its the BULLBUS ones (O2 sensor pointing forwards) that contain the 'warm up cats'! I think you could probably chisel/ragg out the mesh on the bench, but certainly not in situ on car, and further more, there may be a sub routine in ECU used at warm up? that may confuse the 'BRAIN' (or throw up a code) if you do indeed remove them? NOT sure :shock: :oops:
Having grief with my 'photobucket' account which is delaying pic uploads! :(
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PICS OF 3 WAY WARM UP CATS (Equipe?) Removed from front bank, heat shields also removed, Notice casting code K6 ?
Catalyst cell in manifold before downpipe flange ?
Looking up into manifold
How it sits on K8 california lump! ?
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Cant really get camera in there but here's a pic of the slim 'NO CAT' manifold on my 1996 V6 GS! Notice 'NO' bottle shape and a lot slimmer profile? Wonder wether downpipes are interchangeable? as California/equipe 3 way cat, warm up manifolds are a lot deeper?
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@afcb766e1a=blackmexyv6:
Ricco, do you have the slim-line manifolds (O2 sensor in-line with manifold) as I do on my current mexy? as they have 'NO' cats in them?
Really good pictures there!
Fortunately I have the 'sliml design with no precat. I guess the Californian precat is due to their tighter emissions standards for back in the day ;)
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Took the plunge! Removing current catalyst and fitting this ETS de cat tommorow :o
Slightly smaller bore, 2", and it appears to have rifled, perforated, sleeve and surrounding wadding? so it should flow better than CAT but not be overly 'shouty' ?
May record vid/soundtrack for B4 and AFTr ? :?
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:bigok: :D :D :D :D Piece of wee wee to fit! even used both old gaskets
(although gobbed em up with 'mufflit') Replaced bolts with stainless and coated threads with hi temp silicon as I did that 2 years ago on steel bolts I just took off and threads were like new under the nuts :PConclusion: like 'NIKE'…....DO IT!
1. Id say about 10% increase in noise? (standard bosal back box)
2. 20% ? increase in throttle response/driveability and 'smile' width :P.
Well pleased with my tiny financial outlay! slight guilt about polluting planet? kev b.)
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Sounda like your well happy! :cheers: Any pops and bangs yet?? ;)
Does it smell rich once its up to temp now or not too bad?
Does it throw a light up on the dash after or is that also cool?
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Yes Very pleased Ricco :D No havn't heard any 'pops n bangs' yet but havnt really given it the 'full beans'! I only drove it from my fathers garage on friday as he has an inspection pit which aided fitment somewhat :D(about 10 miles or so).
I have noted that at 'queing traffic crawl speeds' in 1st gear and no throttle input with just natural idle rpm the car is vvvvery smooth (even up hill!) whereas before it used to surge and lunge and I had to depress the clutch to correct this?
The engine braking has lessened too and if you stab the throttle in neutral, the revs deffo rise quicker (or smoother?) and don't fall as quickly as they did before I would hope making smoother gear changes?
No, no smell of 'RICH' when warm, but deffo a different smell when cold (more petroly?)
No it'll never throw a light up on dash, as my 1996 GS hasn't got an CEL! :bigok: I did do a code pull at the DLC and no codes were showing I intend to do another pull a 100 miles or so from now, I dont forsee an error as the O2 sensors are upstream of cat bypass pipe, they may take more time to activate/wake up which may throw up codes 15 and 23 but I think those codes are for 'non activation'???? We'll see next month????
Ill post my findings if any? :shock:Oh! for anyone interested, Im running stock air box/filter, with front duct blocked and a 68mm cold air feed tube running from base and poking out through plastic undertray (summer use) I revert back to stock layout in winter to prevent icing up of filter element and faster engine warm up, (less fuel and more pennies in this yorkshiremans pocket :P ) kev b.
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Where did you get it bud?
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Ebay, company called 'ETS' 'Euro Trading Syndicate' I will try and post up original listing or a screen snip of it. I said TRY! :?
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Tried…..... and sucked some seed! :D
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Thanks bud, added to my 'to buy' list. Need to get the KLZE in thd bloody car first lol
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:respect: :( Wha wha….. I want a 2.5 mill.... the rumours are disturbing! :D :mrgreen:
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Looks a good fit, just need a nice stainless system and you are ready for some real popping action
![http://i1297.photobucket.com/albums/ag28/blackmexyv6/P160513_2110_zpsa8f67666.jpg[/img][/url]](http://i1297.photobucket.com/albums/ag28/blackmexyv6/P160513_2110_zpsa8f67666.jpg%5B/img%5D%5B/url%5D){kind=link}
![http://i1297.photobucket.com/albums/ag28/blackmexyv6/P170513_0938_01_zpsdd47825a.jpg[/img][/url]](http://i1297.photobucket.com/albums/ag28/blackmexyv6/P170513_0938_01_zpsdd47825a.jpg%5B/img%5D%5B/url%5D){kind=link}