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| Vonammer | | Set |  |  | | Reg. Date | : | 18/12/2011 | | Posts | : | 9 | | Location | : | Brisbane, Queensland, Australia |
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| | Posted : 25 Jul 2012 - 05:32 Post title : Catalytic converter Removal | | | HI all
I have the Triumph Shorty pipes on my T-Bird, My question is, if i take out the cat, will there be a noticeable difference in performance?
I'm sure the exhaust note will change a little (deeper), just not sure about the other.
Thanks Gents
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| silverfish | | Set | |  | | Reg. Date | : | 23/03/2012 | | Posts | : | 191 | | Location | : | Joburg, South Africa |
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| | Posted : 25 Jul 2012 - 05:43 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | | Your Butt dyno's gonna tell that there is!
And yes the exhaust note will change as well as the desibell level!
I have the short TORS and replaced the cat with straight through bends but it was way to loud for my liking so reinstalled my gutted cat which is reasonably loud and sounds great.
silverfish
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| JDee | | Set | |  | | Reg. Date | : | 06/02/2011 | | Posts | : | 152 | | Location | : | Central Coast, NSW., Australia |
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| | Posted : 25 Jul 2012 - 08:16 Post title : Re: Catalytic converter Removal (Re: silverfish) | | |
Hi Silverfish
Mmmmmmm... 
Thats sounds just like what I want to do.... Maybe I mite like the sound with the straight thru pipe, into my short TORS...
How did u "gut your cat" so to speak ......
John
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| surfing72 | | Set | |  | | Reg. Date | : | 20/03/2012 | | Posts | : | 483 | | Location | : | Nth, New South Wales, Australia |
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| | Posted : 25 Jul 2012 - 09:12 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | | Mate I have done it and I reckon the bike goes harder. Definately sounds louder / better but will pop a little more on decal. I got some elbows with mounts attached off Ebay. I think the bloke was in Slacks Creek on the Gold Coast. Don't know where the shop is I went to his home at Coomera to pick em up. At least if you go this way and don't like it you can always put your cat back on. Some blokes like the sewing machine sound but I believe the old saying - loud pipes save lives. Get into it.
| Dan
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| Vonammer | | Set | | | | Reg. Date | : | 18/12/2011 | | Posts | : | 9 | | Location | : | Brisbane, Queensland, Australia |
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| | Posted : 25 Jul 2012 - 09:32 Post title : Re: Catalytic converter Removal (Re: surfing72) | | | surfing72 wrote:
Mate I have done it and I reckon the bike goes harder. Definately sounds louder / better but will pop a little more on decal. I got some elbows with mounts attached off Ebay. I think the bloke was in Slacks Creek on the Gold Coast. Don't know where the shop is I went to his home at Coomera to pick em up. At least if you go this way and don't like it you can always put your cat back on. Some blokes like the sewing machine sound but I believe the old saying - loud pipes save lives. Get into it. |
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Thanks Surfing
The guys you could be thinking of are M.E.P - Motorcycle Exhaust Professionals, there in Slacks Creek, (Logan), They will supply and fit 2 elbows (cat removed) for around $250.00.
mmm which way to go, knock the guts out of the cat or remove it totally.
| | Post edited by Vonammer on 25 Jul 2012 - 09:33 |
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| surfing72 | | Set | | | | Reg. Date | : | 20/03/2012 | | Posts | : | 483 | | Location | : | Nth, New South Wales, Australia |
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| | Posted : 25 Jul 2012 - 09:50 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | | If you get those parts from that fella you should ask for best price. I'm sure he dropped some dollars off because I picked them up. Pretty expensive but a good product. There are cheaper alternatives but they don't have the brackets welded on and leave to much stress at the joints. As I said once you have butchered your cat you can not go back. But depends what you want at the end of the day. Good luck,
Dan
| Dan
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| ufothunderbird | | Set | |  | | Reg. Date | : | 18/02/2012 | | Posts | : | 220 | | Location | : | TBirdHills, NSW, Australia |
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| | Posted : 25 Jul 2012 - 10:13 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | |
The one thing you don't want to do is ' gut the Cat ' . If you ever have to put it back together for a Rego i inspection or have been pulled over by the law , to replace the cat would cost you $$$ . Foran exhausts on the Central Coast of NSW make the ( by far ) the best value for a cat delete pipe . I paid $ 240 from Dennis for a polished stainless steel cross over and the fit and finish and build is as good as Staintunes and they wanted twice that much. He also does them in Powdercoated black and some triumph dealers in Sydney are charging $ 350 for the same item ...
Of course everyone has their own opinion but I like the extra note that it gave... But its the weight of the fuckers...
No increase in Torque > lost a little if anything GOOD LUCK 
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| bnz433 | | Jupiter | |  | | Reg. Date | : | 10/06/2011 | | Posts | : | 1,843 | | Location | : | Clifton Park (Upstate), NY, United States |
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| | Posted : 25 Jul 2012 - 11:53 Post title : Re: Catalytic converter Removal | | | I've got my shorties en route from a fellow member (thank you, sir!!!!!). While there are several de-cat options and opinions, my question is does anyone have tangible dyno comparisons (preferrably on the SAME Dyno!!) of these:
1) With stock cat (free)
2) With elbows to eliminate cat ($50usd)
3) With "crossover" decat pipe option ($250+usd)
4) Gutted cat (labor...$$)
Assuming the pipes used would be the same, if there's a noticeable difference I'd consider the crossover...but figure since the bike already has a crossover for balancing purposes, why put in another??
If it's all negligible, then I'm going with the $50 (or cheaper) elbow option using exhaust 45deg elbows, or going the super-cheap electrical conduit pipe 90deg elbow cut in half.
Jamie
| Bennington Triumph Bash - 31May-2June 2019. Home of the (tied in '14 & '15) US RECORD T-BIRD FLOCKING!!!!!
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| DizzE | | Thor | |  | | Reg. Date | : | 12/07/2010 | | Posts | : | 3,141 | | Location | : | Sunnyvale, CA, United States |
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| | Posted : 25 Jul 2012 - 15:55 Post title : Re: Catalytic converter Removal (Re: bnz433) | | | AFAIK, we only have a tune for #2. So, it is an entirely differnent problem to have it dyno with your config.
You have to get a dyno guy that will use Tune Ecu.
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| bnz433 | | Jupiter | | | | Reg. Date | : | 10/06/2011 | | Posts | : | 1,843 | | Location | : | Clifton Park (Upstate), NY, United States |
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| | Posted : 25 Jul 2012 - 19:50 Post title : Re: Catalytic converter Removal (Re: DizzE) | | | Dizze - thanks. I guess I was questioning the "need" for any crossover solution if the simple elbows provide the same performance. I've never seen any tangible benefit of the crossover delete since we alreay have a crossover up front. I'm a cheap bastard, so probably just going elbows, unless there's data out there showing the benefit of the x-over.
Jamie
| Bennington Triumph Bash - 31May-2June 2019. Home of the (tied in '14 & '15) US RECORD T-BIRD FLOCKING!!!!!
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| surfing72 | | Set | | | | Reg. Date | : | 20/03/2012 | | Posts | : | 483 | | Location | : | Nth, New South Wales, Australia |
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| | Posted : 25 Jul 2012 - 21:51 Post title : Re: Catalytic converter Removal (Re: bnz433) | | | Mate being a cheap bastard could cause you dramas down the line. I read somewhere on this forum previous to removing my Cat that if you go for the cheap conduit or elbows (without brackets) will leave to much stress on that section of the pipes. Standard your exhaust system attaches to the bike at 3 points each side, header, cat and muffler. Some of these cheaper methods only attach the exhaust system at header and muffler leaving pressure on the new elbow joints. Hope that makes sense.
Something to think about....
Dan
| Dan
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| ufothunderbird | | Set | | | | Reg. Date | : | 18/02/2012 | | Posts | : | 220 | | Location | : | TBirdHills, NSW, Australia |
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| | Posted : 25 Jul 2012 - 22:39 Post title : Re: Catalytic converter Removal (Re: surfing72) | | |
surfing72 wrote:
Mate being a cheap bastard could cause you dramas down the line. I read somewhere on this forum previous to removing my Cat that if you go for the cheap conduit or elbows (without brackets) will leave to much stress on that section of the pipes. Standard your exhaust system attaches to the bike at 3 points each side, header, cat and muffler. Some of these cheaper methods only attach the exhaust system at header and muffler leaving pressure on the new elbow joints. Hope that makes sense.
Something to think about....
Dan |
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Dan your on the money there.. one reason why Foran Exhausts use the cross over is keep the rigidity of the complete system ( without the cat in place ) The Cat acts as a stressed member and keeps it rigid. It still is not as tight as with the Cat but goes some way towards it...
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| bnz433 | | Jupiter | | | | Reg. Date | : | 10/06/2011 | | Posts | : | 1,843 | | Location | : | Clifton Park (Upstate), NY, United States |
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| | Posted : 25 Jul 2012 - 22:57 Post title : Re: Catalytic converter Removal (Re: ufothunderbird) | | | Somewhat agree, but the cat also weighs about 20-30lbs, so needs to have it's own mounting, right?! Not for stress relief of the pipes, but for it's own support req'ts.
All around the "modded bike" world, it's pretty much header pipes to some brand of slip-on muffler...supported in 2 places (usually)...at the header and at the muffler. The short TORs are even lighter than the stock longs or possibly any of the other aftermarket pipes...further reducing your stress points.
There's a lot of 'birds out there with no cat, but also no bypass pipe. By "cheap bastard", i'm only saying that unless there's an HP or TQ benefit, I don't see the need. These are very short, very light exhaust systems. Mechanical stress is far less than being theorized IMHO.
Jamie
| Bennington Triumph Bash - 31May-2June 2019. Home of the (tied in '14 & '15) US RECORD T-BIRD FLOCKING!!!!!
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| Noladuck | | Set | |  | | Reg. Date | : | 05/06/2011 | | Posts | : | 260 | | Location | : | Portland, Oregon, United States |
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| | Posted : 26 Jul 2012 - 04:51 Post title : Re: Catalytic converter Removal (Re: bnz433) | | | I tried the conduit elbow, and had a considerable exhaust leak where I made the cut. Some 90 degree elbows go a bit out of round when they are bent, so when you cut the elbow in 2 to make your 45's, the pipe is out of round. I tried a couple different brands of conduit, and had the same problem. Ultimately, I went with the 45 stainless elbows on ebay, and they didn't leak.
Chris
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| bnz433 | | Jupiter | | | | Reg. Date | : | 10/06/2011 | | Posts | : | 1,843 | | Location | : | Clifton Park (Upstate), NY, United States |
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| | Posted : 26 Jul 2012 - 12:10 Post title : Re: Catalytic converter Removal (Re: Noladuck) | | | Yup - for "roundness" reasons, if you can find a mandrel-bent 90deg to cut in half it'll work. Otherwise, a few bucks more and just get 2x 45deg exhaust elbows.
| Bennington Triumph Bash - 31May-2June 2019. Home of the (tied in '14 & '15) US RECORD T-BIRD FLOCKING!!!!!
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| Vonammer | | Set | | | | Reg. Date | : | 18/12/2011 | | Posts | : | 9 | | Location | : | Brisbane, Queensland, Australia |
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| | Posted : 29 Jul 2012 - 12:23 Post title : Re: Catalytic converter Removal (Re: bnz433) | | | Thanks for all your feedback gents
One more question for arguments sake, I was told by my dealer, the popping can be caused by the higher octane fuel.
I have noticed a with tank full of 98 octane, the bird popps a little more, but with 91-95 octane its pops considerbly less.
So if i removed the cat and went straight through using a lower octane fuel it shouldn't pop as much?, am just asking.
Thanks again
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| ThunderRat | | Jupiter | |  | | Reg. Date | : | 08/03/2010 | | Posts | : | 1,056 | | Location | : | Castle Hill, NSW, Australia |
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| | Posted : 31 Jul 2012 - 13:41 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | | The only real way to get rid of the popping is to get the bike dynoed. I originally had the short TORS and Foran crossover but the pipes just did not do it for me. I think the exit hole on them looks too small for such a fat pipe and they sound raspy without the cat. I then put on a full Foran system and there was a big difference in both sound and performance. I also like the way the Forans sit on the bike and the stainless steel finish is better than anything else on the market.
As far as octane goes I run 98 or 95 and have very little popping but I have also have the 1700 kit with additional mods done to the cam and breathing.
| "I started life with nothing and still have most of it left"
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| daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 31 Jul 2012 - 14:02 Post title : Re: Catalytic converter Removal (Re: Vonammer) | | | People generally report much greater popping w/o the cat. As to what makes it pop, hard to say because some birds certainly aren't lean but still do a lot. As a 1600 with tors mine popped a LOT. With stock pipes (bike 100% stock) it popped just as much but you couldn't hear it easily because the baffles killed the sound. That is UNTIL you rode next to a wall so that the noises your bike makes are much more audible to you. Then you could hear it's there, but very very quiet and it's a bit different sound due to being muffled. But it IS popping and it was there big time even stock. Tried plugging SAI and that seemed to help quite a bit. But i removed that plug because after i got the 1700 kit installed it stopped. It will still pop on hard decel after high rpm running a bit, but it's 95% less than before and completely gone while riding normally.
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
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