ugy Donating Members 199 Member For: 19y 6m 3d Location: Auckland Posted 16/02/06 09:20 PM Share Posted 16/02/06 09:20 PM Well I finally done it, took the cat off and replaced it with a 3" pipe. I Had to lead the exhaust guy by the hand but got there in the end. (There's some guys out there that should be selling icecreams). Any way I took it back for a retune and it went from 285rw to 320rw.I have red on the forum that the cat is the big restriction. and see that now.It is quite a bit noisier now but I still dont mind but if I get sick of it I will put my centre muffler back in.I got the 320rw on the first run and also the car dropped 2 cylinders (valve springs). So in went a set of Nizpros. I also got it backed off to 302rw as I am still a little bit worried about other things and am happy with what I have.With the cat gone it seems a lot more responsive for a 18rw gain. I have a Q that somebody might help me with.Would it be the cat removal that made it so much more responsive or do the factory springs start to break down over a period and the Nizpros compencated for this?I did notice after I had the 285rw tune it didn't perform as well after a while. Also it's a MK11 auto 10,000ks Thanks guys Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/ Share on other sites More sharing options...
F6_Tornado F6+300+ Member 940 Member For: 20y 5m 16d Location: In The Ute Posted 16/02/06 09:42 PM Share Posted 16/02/06 09:42 PM With the cork removed from its ass it will be heaps more responsive..285>>>320 = 35 rwkws and helps heaps with the response as you mentioned. Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349701 Share on other sites More sharing options...
Blowute Member 56 Member For: 19y 3m 22d Location: Brisbane Posted 16/02/06 09:47 PM Share Posted 16/02/06 09:47 PM Holy sh!t that's an awesome gain! Damn I have to get rid of mine I think! Now, how to convince the exhaust guy... Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349708 Share on other sites More sharing options...
ducatijb Lifetime Members 3,448 Member For: 22y 21d Gender: Male Location: sydney Posted 16/02/06 09:59 PM Share Posted 16/02/06 09:59 PM Did you punch out the cat or completely remove it??/Good gains by the way Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349715 Share on other sites More sharing options...
ugy Donating Members 199 Member For: 19y 6m 3d Location: Auckland Posted 16/02/06 10:16 PM Author Share Posted 16/02/06 10:16 PM With the cork removed from its ass it will be heaps more responsive..285>>>320 = 35 rwkws and helps heaps with the response as you mentioned. <{POST_SNAPBACK}>I did get the 35 gain but I backed it off to 303rw but it still feels like a 35rw gain.When you are driving it feels like it's being held back and wants to take off it's so much more responsive and I thought the valve springs might have been playing up all along Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349721 Share on other sites More sharing options...
ugy Donating Members 199 Member For: 19y 6m 3d Location: Auckland Posted 16/02/06 10:23 PM Author Share Posted 16/02/06 10:23 PM Did you punch out the cat or completely remove it??/Good gains by the way <{POST_SNAPBACK}>Hi, no in the end I got him to put a 3" pipe down to the twin pipesWe dont have a law in NZ at the moment regarding the cat,but it is coming. It seems to be a lot more responsive all over the range. I really couldn't believe the difference it made, that's why I thought my valve springs might have been an issue. Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349727 Share on other sites More sharing options...
jordak Member 1,226 Member For: 20y 10m 15d Posted 16/02/06 10:56 PM Share Posted 16/02/06 10:56 PM Did you punch out the cat or completely remove it??/Good gains by the way <{POST_SNAPBACK}>Hi, no in the end I got him to put a 3" pipe down to the twin pipesWe dont have a law in NZ at the moment regarding the cat,but it is coming. It seems to be a lot more responsive all over the range. I really couldn't believe the difference it made, that's why I thought my valve springs might have been an issue.<{POST_SNAPBACK}>I replaced the cat with a 3" pipe (for a temporary trial period) and it resulted in a similar gain on the dyno to yours. As you have reported what was more impressive was the increased throttle response across the entire rev range.My valve springs also need replacing however this only restricts performance above 5000rpm so I think you can thank the lost cat for the bulk of your useable gains. If noise is an issue replace your centre muffler, I have a 3" system with centre muffler intact and the cat removal made very little if any difference to the sound, until you put your boot into it that is. Congrats on the great results Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349741 Share on other sites More sharing options...
ugy Donating Members 199 Member For: 19y 6m 3d Location: Auckland Posted 17/02/06 12:25 AM Author Share Posted 17/02/06 12:25 AM Did you punch out the cat or completely remove it??/Good gains by the way <{POST_SNAPBACK}>Hi, no in the end I got him to put a 3" pipe down to the twin pipesWe dont have a law in NZ at the moment regarding the cat,but it is coming. It seems to be a lot more responsive all over the range. I really couldn't believe the difference it made, that's why I thought my valve springs might have been an issue.<{POST_SNAPBACK}>I replaced the cat with a 3" pipe (for a temporary trial period) and it resulted in a similar gain on the dyno to yours. As you have reported what was more impressive was the increased throttle response across the entire rev range.My valve springs also need replacing however this only restricts performance above 5000rpm so I think you can thank the lost cat for the bulk of your useable gains. If noise is an issue replace your centre muffler, I have a 3" system with centre muffler intact and the cat removal made very little if any difference to the sound, until you put your boot into it that is. Congrats on the great results <{POST_SNAPBACK}>Thanks Jordak a great reply.I was hoping someone would come up with a similar result. I thought it might have been all in the mind. Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349765 Share on other sites More sharing options...
boosted_sa Member 270 Member For: 19y 9m 5d Posted 17/02/06 08:10 AM Share Posted 17/02/06 08:10 AM EPA's gonna love you guys!!! Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349873 Share on other sites More sharing options...
LightningXR6T Member 197 Member For: 19y 9m 23d Location: Newcastle NSW Posted 17/02/06 09:22 AM Share Posted 17/02/06 09:22 AM OK, the Cats restrictive! What brand of performance cat can take it's place so we can have the gain but keep EPA happy? Link to comment https://www.fordxr6turbo.com/forum/topic/23445-cat-gone/#findComment-349910 Share on other sites More sharing options...
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