Neilp Posted March 4, 2012 Posted March 4, 2012 There are two catalyst elements in the one cat pipe on the DE engined 350s. One before the bend and one after. soo , still one cat section, if you take them out you no-longer have cats ? Quote
Jez @ H-Dev Posted March 4, 2012 Posted March 4, 2012 There are two catalyst elements in the one cat pipe on the DE engined 350s. One before the bend and one after. soo , still one cat section, if you take them out you no-longer have cats ? Yeah, thats right - basically what MaDMaXX's tuner said is right and so is what Mark said. Quote
Neilp Posted March 4, 2012 Posted March 4, 2012 There are two catalyst elements in the one cat pipe on the DE engined 350s. One before the bend and one after. soo , still one cat section, if you take them out you no-longer have cats ? Yeah, thats right - basically what MaDMaXX's tuner said is right and so is what Mark said. yeah, so basically you have two banks of catalysts (2 sections) which have 2 catalytic elements internally Quote
Mark@Abbey m/s Posted March 5, 2012 Posted March 5, 2012 Just had a look @ a stock catalyst from a DE car and yes there are 2 matrix's within the cat pipe , the rear 02 sensor is actually in between the 2 matrix's and the front matrix looks far more dense than the rear matrix. Quote
GT4 Zed Posted March 5, 2012 Posted March 5, 2012 Yup. one matrix is standard ceramic and the other is metal substrate (i guest 400cell or more looking at how tightly packed it is )End result is that the flow is very resticted especially by the ceramic part of the cats Quote
MaDMaXX Posted March 6, 2012 Posted March 6, 2012 Just had a look @ a stock catalyst from a DE car and yes there are 2 matrix's within the cat pipe , the rear 02 sensor is actually in between the 2 matrix's and the front matrix looks fa rmore dense than the rear matrix. That sounds so restricted, you weren't kidding when you said they're the most restricted part of the 350 exhaust. Quote
tez162003 Posted March 6, 2012 Posted March 6, 2012 Regardless of the MOT issues, what should you look out for when buying de cats? What's this issue with sensor spacers all about? I want de cats for mine, but want ones that fit on properly and have all the right holes etc. I don't want big spacers that make the sensors sit close to the ground as my car is bloody close as it is lol Do silenced de cats give much more sound? Quote
Neilp Posted March 6, 2012 Posted March 6, 2012 My japspeed ones were perfect fitting, good looking welds, O2 bungs already fitted. Threw a fault every now and then by apart from that it was perfect. Tracked all last year with them and still in good condition upon a recent inspection Quote
tez162003 Posted March 6, 2012 Posted March 6, 2012 What are the bungs all about? Is there only 1 O2 sensor on each pipe? Quote
Neilp Posted March 6, 2012 Posted March 6, 2012 Yeah the O2 sensor which is in the cats goes into it Quote
JoshThePonce Posted March 6, 2012 Author Posted March 6, 2012 i've just had delivery of japspeed decats by another forum member, hopefully getting them fitted tomorrow so i'll post up a video of what they sound like paired up with an impul cat back system Quote
MaDMaXX Posted March 7, 2012 Posted March 7, 2012 Sensor bungs, or anti foulers, are there to hold the sensor out of the main exhaust stream, hopefully far enough that they don't sense the gasses enough that they think you've got a cat problem and turn on the CEL. No company worth their salt design them to hang down, so don't worry about that. Other than that, the only other problem with test pipes/de-cats, is that on the 350, at least, they introduce rasp, which most people don't like. Silenced or resonated de-cats help to remove this. Quote
Neilp Posted March 7, 2012 Posted March 7, 2012 If you put antifoulers onto decats they do hit the ground mate, i had to take mines off or I would rip the o2 sensors out on the ground. This is because the japspeed ones come with spacers already fitted. Quote
MaDMaXX Posted March 8, 2012 Posted March 8, 2012 Erm, this is all dependant on which way the anti foulers point!?!?! if you put them on pointing down, of course they'll hit the ground Quote
Neilp Posted March 8, 2012 Posted March 8, 2012 Erm, this is all dependant on which way the anti foulers point!?!?! if you put them on pointing down, of course they'll hit the ground Have you seen japspeed decats?? What your talking about is drilling new holes for the decats, not putting them onto the factory fitted sensor holes. I'm talking from experience on this. If you drill new holes then you can put then wherever you want. Quote
Mark@Abbey m/s Posted March 8, 2012 Posted March 8, 2012 Anti foulers bolt into the orginal post cat lambda bosses , Japspeed de-cats seem to have these slightly to low in my opinon. Quote
MaDMaXX Posted March 9, 2012 Posted March 9, 2012 Erm, this is all dependant on which way the anti foulers point!?!?! if you put them on pointing down, of course they'll hit the ground Have you seen japspeed decats?? What your talking about is drilling new holes for the decats, not putting them onto the factory fitted sensor holes. I'm talking from experience on this. If you drill new holes then you can put then wherever you want. I have not seen the japspeed ones, i'm fitting ART pipes, but that's just dumb IMO, oh well, not everyone designs things properly i guess. Assuming there is no way to turn them? perhaps using a lock nut? Quote
The Seasider Posted March 12, 2012 Posted March 12, 2012 I don't know, I start a nice little discussion, go away for a few days and you all end up talking in some strange code to each other Pleased to report that my thingummys are back on the pipey bits and Z sound like he's got his b0ll0cks back. Whatever I've got were put on at Abbey Motorsport by the previous owner - and damn good they are too Quote
The Seasider Posted March 2, 2013 Posted March 2, 2013 By way of an update - the car failed its MOT again, so had to refit the cats for the re-test and then reverted back to the racing cats a few days later. Decided to spoil it a bit, cleaned up the pop charger and re-oiled it, cleaned the MAF meter/sensor and fitted new spark plugs and the car is absolutely flying To think I nearly sold it at Christmas - whatever was I thinking! Quote
gazzard27 Posted February 24, 2015 Posted February 24, 2015 hi all, so out of recommendation for not throwing the CEL light on and a good sound, which decats are best to get? Quote
Tuck Posted February 26, 2015 Posted February 26, 2015 These exhausts you see on ebay (highly polished & cheap) are unbranded toyosports parts. They aren't a brilliant fit, if fitting a decat manifold to my old clio rs200 is anything to go by. As for MOT it really depends on how vigilant the tester is, My old car passed with no advisories having the main cat and resonator removed. Yet I've heard its not uncommon for a tester to fail a car with the main cat removed but still passing emissions. Quote
Angrybiker Posted February 26, 2015 Posted February 26, 2015 I'd de-cat my Z 2moro but the CEL light would annoy me Sent from my iPhone using Tapatalk Quote
gazzard27 Posted February 27, 2015 Posted February 27, 2015 think going the HFC route might be better as im staying N/A so dont want to lose any power but still want the sound of that sweet sweet 350z V6 purring under the bonnet (i think im in love) ... ive been told about this... isnt this Z-sydnrome :O Quote
Ian Posted February 27, 2015 Posted February 27, 2015 I'd de-cat my Z 2moro but the CEL light would annoy me Sent from my iPhone using Tapatalk So get the spacers or uprev and then you wont be annoyed anymore Quote
Angrybiker Posted February 27, 2015 Posted February 27, 2015 I've heard mixed reviews about the spacers and I don't think i'd spend the money on an up-rev... Although there was a time when I didn't think I'd spend £80 on a gear knob or £40 for coloured bolts so u never know Sent from my iPhone using Tapatalk Quote
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