mikeyb10supra Posted March 18, 2008 Share Posted March 18, 2008 Gaz if I supplied a 3" 1st decat (apexi one) could you fit a sports cat into the pipe?? this is something ive been considering for a while now as mine overboosts like a biatch in the colder weather at the moment ive stuck the 1st cat back in to bring boost down to resonable levels but my EGT's are now a sorry state of affairs and hate to see what there going to be like in the summer Quote Link to comment Share on other sites More sharing options...
BOB B Posted March 28, 2008 Share Posted March 28, 2008 I can supply the Weds Revcatalyzer for £369 including postage http://www.weds.co.jp/images/products/gt/catalyzer_pic_03.jpg Hi everyone. Ive been watching this thread develop for a time now and Im very intrested in the sports cat Nic posted, though I have a few questions and if anyone could answer them it would be greatly appreciated. I have a UK TT with second cat removed and a super dragger and pipe through to the first cat, would adding a sports cat give me a better bhp? would I have a problem with O2 sensors? (are there 2 on a uk?) and slightly aside, everyone talks about fitting an RR on a full de-cat J spec do you not need it on the UK TT? Cheers. Bob. Quote Link to comment Share on other sites More sharing options...
BOB B Posted March 29, 2008 Share Posted March 29, 2008 Hi. I think this thread is begining to get close to dropping off the edge of the world now so Ill give it a bump then go over to the tech section, anyone able to help with the above questions. Bob. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted March 29, 2008 Share Posted March 29, 2008 Gaz if I supplied a 3" 1st decat (apexi one) could you fit a sports cat into the pipe?? this is something ive been considering for a while now as mine overboosts like a biatch in the colder weather at the moment ive stuck the 1st cat back in to bring boost down to resonable levels but my EGT's are now a sorry state of affairs and hate to see what there going to be like in the summer Hi Mikey, I'd rather put the cat in the 2nd pipe - theres more room TBH. Gaz. Quote Link to comment Share on other sites More sharing options...
Burna Posted March 29, 2008 Share Posted March 29, 2008 Hi everyone. Ive been watching this thread develop for a time now and Im very intrested in the sports cat Nic posted, though I have a few questions and if anyone could answer them it would be greatly appreciated. I have a UK TT with second cat removed and a super dragger and pipe through to the first cat, would adding a sports cat give me a better bhp? would I have a problem with O2 sensors? (are there 2 on a uk?) and slightly aside, everyone talks about fitting an RR on a full de-cat J spec do you not need it on the UK TT? Cheers. Bob. Hi Bob, From what I gather sport cats are less restrictive than normal cats which in turn will give you extra bhp. Being a UK you have two O2 sensors, the first is before the first cat and the second is in the second cat. You say you've had the second cat removed so you already have a flange welded to that one with the O2 sensor plumbed in, so no need to worry about the O2 sensors. If you want to fit a sport cat in replacement of the the first cat then you will need to buy one from the US as they will fit the UK Supra, where as the sport cats from Japan will all be for JDM cars and hence will not fit. If you wanted to go for one of Gaz's sports cats you could remove your second decat pipe and sell it, purchase a UK first decat pipe along with a sports cat from Gaz. Just make sure you get the flange welded into the sports cat. In regards to a restrictor ring on a UK spec, you don't need one due to the UK having a larger wastegate. Click on BPU for more info. Quote Link to comment Share on other sites More sharing options...
Angarak Posted March 29, 2008 Share Posted March 29, 2008 I was tempted to get a sports cat, but my AEM UEGO manual said they interfere with AFR guage readings if the AFR sensor is located after a CAT (which it would be as it must be 36" away from the manifold). Quote Link to comment Share on other sites More sharing options...
BOB B Posted March 29, 2008 Share Posted March 29, 2008 Thanks Burna, Im glad somone talked to me. I need to have a good look at my exhaust to make sure that the sensor where the second cat was is there, the pipe I have fitted goes all the way from the rear box to the first cat, so it would work out expensive to get Gaz to do it. Cheers Bob. Quote Link to comment Share on other sites More sharing options...
Burna Posted March 30, 2008 Share Posted March 30, 2008 Thanks Burna, Im glad somone talked to me. I need to have a good look at my exhaust to make sure that the sensor where the second cat was is there, the pipe I have fitted goes all the way from the rear box to the first cat, so it would work out expensive to get Gaz to do it. Cheers Bob. No problem It if were you I would bin the first cat and just get UK first decat pipe. I would guess although sports cats are less restrictive they will still be more restrictive than a straight through decat pipe, and if you planning on running more boost than what the sports cat allows then EGT's are surely going to increase compared to a decat pipe. Whether the EGT's will still be within a acceptable level I have no idea as I don't know of anyone with a sports cat fitted or seen any EGT information posted. When it comes to MOT time either find a friendly MOT tester or just drop the second cat back in, it's a hell of a lot easier to swap the second one in and out than the first. You just can't beat the sound of a UK with full decat, sports exhaust, and no restrictor ring when that second turbo comes online It's like god shouting! Quote Link to comment Share on other sites More sharing options...
bodilx6 Posted November 12, 2008 Share Posted November 12, 2008 Any news on this thread? It seemed to end up in a theoretical discussion in stead of some results from exprience. Is there any sports/hi-flow cats out there, to fit in a decatted jspec to clear MOT and not restiction much more than a restrictor ring. Quote Link to comment Share on other sites More sharing options...
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