cainhead Posted June 8, 2011 Share Posted June 8, 2011 Hello, Quick question on decats. If I am looking to loose the 2nd cat, I obviously need the decat pipe. What I am unsure of is the diameter of pipe I need. My Exhaust system is an HKS Priest, and I believe it to be a 3" cat back. However when looking around, all decat pipes seem to be 2.5" diameter. Would this fit, and after would I just need to buy an FCD. Cheers for any help given. Link to comment Share on other sites More sharing options...
AlexJames Posted June 8, 2011 Share Posted June 8, 2011 ... and after would I just need to buy an FCD. Cheers for any help given. It depends on what you want to do with it mate. But (someone correct me if im wrong) the fuel cut will kick in when both cats are removed. Link to comment Share on other sites More sharing options...
Josh Posted June 9, 2011 Share Posted June 9, 2011 It depends on what you want to do with it mate. But (someone correct me if im wrong) the fuel cut will kick in when both cats are removed. You are right but only if the boost goes above 1bar for 3 seconds. It all depends on what other mods you're going to do but you will more than likely need a RR. Also the 2.5" decat pipe for the Supra will have the same fixings as the stock 2nd cat so it will fit. As for needing a 3" pipe, just adjust the size of the RR until you're holding at 1bar with no boost controller (will need FCD and boost gauge to check). Link to comment Share on other sites More sharing options...
Dnk Posted June 9, 2011 Share Posted June 9, 2011 (edited) Think you should ask what car he's got first as it looks like an NA in his garage so i doubt his boost will go up Edited June 9, 2011 by Dnk (see edit history) Link to comment Share on other sites More sharing options...
Josh Posted June 9, 2011 Share Posted June 9, 2011 Think you should ask what car he's got first as it looks like an NA in his garage so i doubt his boost will go up Ah, I just assumed it was a TT due to him mentioning a FCD. Forget what I said then, Mr. OP! Link to comment Share on other sites More sharing options...
AlexJames Posted June 9, 2011 Share Posted June 9, 2011 Ah yeah, Iv heard you can get boost problems on an N/A Link to comment Share on other sites More sharing options...
Kirk Posted June 9, 2011 Share Posted June 9, 2011 Also the 2.5" decat pipe for the Supra will have the same fixings as the stock 2nd cat so it will fit. Curious logic you have there, whats different about a 3" decat fitment in regards to 2.5". Link to comment Share on other sites More sharing options...
Josh Posted June 9, 2011 Share Posted June 9, 2011 Curious logic you have there, whats different about a 3" decat fitment in regards to 2.5". If his cat back exhaust fits on the stock 2nd cat then the 2nd decat pipes that are made for the Supra will fit in place of the 2nd cat. I've no idea if there's a difference with the 2.5" and 3" decat pipe fittings though. Link to comment Share on other sites More sharing options...
Kirk Posted June 9, 2011 Share Posted June 9, 2011 If his cat back exhaust fits on the stock 2nd cat then the 2nd decat pipes that are made for the Supra will fit in place of the 2nd cat. I've no idea if there's a difference with the 2.5" and 3" decat pipe fittings though. See i read that as if you were saying a 2.5" will fit and a 3" wouldn't which would be completely untrue as its the same pipe with just larger diameter piping but ill give you the benefit of the doubt and you didnt actually mean that Ah yeah, Iv heard you can get boost problems on an N/A Like when a vac like comes off for example and you get no midrange kick ? Link to comment Share on other sites More sharing options...
Ark Posted June 9, 2011 Share Posted June 9, 2011 Hello, Quick question on decats. If I am looking to loose the 2nd cat, I obviously need the decat pipe. What I am unsure of is the diameter of pipe I need. My Exhaust system is an HKS Priest, and I believe it to be a 3" cat back. However when looking around, all decat pipes seem to be 2.5" diameter. Would this fit, and after would I just need to buy an FCD. Cheers for any help given. Hi Andrew, You'll be fine with a 2.5" pipe. It'll fit fine as they're all designed to be fit 'n forget direct replacements. You'll see no benefit from a 3" system apart from more noise. No need for an FCD on a non-turbo buddy. Link to comment Share on other sites More sharing options...
cainhead Posted June 9, 2011 Author Share Posted June 9, 2011 Hello, just got back to my laptop, thanks for all the reply's. Just to clear up,I have a jspec n/a SZ-R converted to a UKTT. Does this change anything? Link to comment Share on other sites More sharing options...
Josh Posted June 9, 2011 Share Posted June 9, 2011 Hello, just got back to my laptop, thanks for all the reply's. Just to clear up,I have a jspec n/a SZ-R converted to a UKTT. Does this change anything? It means I was right Have a good read of this -> BPU Link to comment Share on other sites More sharing options...
Homer Posted June 9, 2011 Share Posted June 9, 2011 Hello, just got back to my laptop, thanks for all the reply's. Just to clear up,I have a jspec n/a SZ-R converted to a UKTT. Does this change anything? Nope Hello, by the way Link to comment Share on other sites More sharing options...
scotty71 Posted June 9, 2011 Share Posted June 9, 2011 It means I was right - but still an idiot Have a good read of this -> BPU - not the ten pages I asked about it exactly Josh Link to comment Share on other sites More sharing options...
Dnk Posted June 10, 2011 Share Posted June 10, 2011 It means I was right Have a good read of this -> BPU Actually it doesnt as he wont need a restrictor ring if he has a uk set up Link to comment Share on other sites More sharing options...
Ark Posted June 10, 2011 Share Posted June 10, 2011 Hello, just got back to my laptop, thanks for all the reply's. Just to clear up,I have a jspec n/a SZ-R converted to a UKTT. Does this change anything? Ah, well the point still stands that you won't need an FCD if you're keeping the first cat, and don't have a boost controller to raise boost further. You _may_ see more benefit from a 3" pipe, but it'll be a trivial difference. Link to comment Share on other sites More sharing options...
cainhead Posted June 10, 2011 Author Share Posted June 10, 2011 Thanks again for the info, just moving house so only just got back to my pc. Hello there My Homer, and hello to Mr Ark. Long time no speak! Let me know if there is anything local going on soon, would be good to catch up. Link to comment Share on other sites More sharing options...
Homer Posted June 10, 2011 Share Posted June 10, 2011 Not sure where you're based these days Andrew, but there's a meet on at Ace Cafe on the 23rd June Would be nice to say hello, it's been a while! http://www.mkivsupra.net/vbb/showthread.php?248034 Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now