|  | Topic : Cat Eliminator |  |
| | | peteronkarra | | Chaac |  |  | | Reg. Date | : | 01/04/2012 | | Posts | : | 830 | | Location | : | Karragarra Island, Queensland, Australia |
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| | Posted : 28 May 2013 - 05:16 Post title : Re: Cat Eliminator (Re: Leethal) | | | Excellent plan
| I sometimes wonder what I"ll do when I grow up.... but not very often
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| | | BigNoseG | | Set | | | Reg. Date | : | 24/05/2012 | | Posts | : | 25 | | Location | : | New Zealand |
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| | Posted : 05 Jun 2013 - 07:19 Post title : Re: Cat Eliminator (Re: AleXL4) | | |
AleXL4 wrote:
Morning Pete,
Gather you have seen these for the T-Bird.
Guys at Team Moto Virginia have them.
Works very well. 
Cheers Alex 
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Hi Alex, all
Looking at getting either the Meerkat cat bypass or the David Platt cat by pass. Does anyone know:
Which was is louder, has the deeper rumble (is their any sound bites for the Meerkat)
which was has the closer alignment to the TOR tune, and
which one do you feel is better made (or since no one would have bought both, how have you found the build quality on your one).
The other thing that slightly concerns me about the Meerkat bypass is that it doesn't have mounting bolts (where as the DAvid Platt by pass does). Does anyone see this as a problem for keeping the exhaust rigid, rattles etc. The Meerkat appears to have a slightly bigger collector box, does this make a difference in balancing the pipes.
Loud is my main aim, yup its pretty shallow I know but hey your mid life crisis has to have a bit of noise to stop me falling asleep.
Thanks all
G
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| | | daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 05 Jun 2013 - 13:38 Post title : Re: Cat Eliminator (Re: BigNoseG) | | |
BigNoseG wrote:
AleXL4 wrote:
Morning Pete,
Gather you have seen these for the T-Bird.
Guys at Team Moto Virginia have them.
Works very well.
Cheers Alex
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Hi Alex, all
Looking at getting either the Meerkat cat bypass or the David Platt cat by pass. Does anyone know:
Which was is louder, has the deeper rumble (is their any sound bites for the Meerkat)
which was has the closer alignment to the TOR tune, and
which one do you feel is better made (or since no one would have bought both, how have you found the build quality on your one).
The other thing that slightly concerns me about the Meerkat bypass is that it doesn't have mounting bolts (where as the DAvid Platt by pass does). Does anyone see this as a problem for keeping the exhaust rigid, rattles etc. The Meerkat appears to have a slightly bigger collector box, does this make a difference in balancing the pipes.
Loud is my main aim, yup its pretty shallow I know but hey your mid life crisis has to have a bit of noise to stop me falling asleep.
Thanks all
G |
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If you want loud, why not go with elbows? At $5 to $8 it's a lot cheaper, and unlike that X-over it's a straight line from header to muff meaning less restriction and volume. But whichever you use i would suggest NOT using the tors tune. It's not meant for that state of tune and there are a couple others here that will work much better delivering better sound and power. A LOT more power.
As far as rigidity, i ran elbows for about 6 months and theres no issue w/o mounting that i can see. Many here run elbows and no one has has issues. It's quite rigid even w/o a mounting point there.
| 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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| | | BigNoseG | | Set | | | Reg. Date | : | 24/05/2012 | | Posts | : | 25 | | Location | : | New Zealand |
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| | Posted : 06 Jun 2013 - 11:52 Post title : Re: Cat Eliminator (Re: daz) | | | Thanks Daz,
That was my original idea but:
Had read the cross over pipe was needed to balance the system, but I haven't managed to understand how valid that is yet, there is a lot of different opinions out there.
The other reason was I had read the Meerkat wouldn't need a tune with the standard pipes and by the time I bought the kit to do this I would be around the same price. Was looking to go with TOR's at some stage and so was hoping a TOR tune from my dealer would suffice.
Lastly, I had done a lot of mods on my old speedmaster, but have never applied a tune, so I am a little apprehensive in case I screw it up and break my bike. My local dealer wouldn't really be into this kind of thing either, they are more an off the shelf type shop so feel a little unsupported if it goes south. Have watched some videos on tuning and looks simple but it also looks like there is scope to screw it up.
What tuning kit do most people use? TuneECE?
thanks G
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| | | daz | | Zeus | | | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 06 Jun 2013 - 13:57 Post title : Re: Cat Eliminator (Re: BigNoseG) | | | Ok, it's your call but let me just reply to 2 things. First, there is no need to balance things, as there is already a balance tube at the headers under the bike. Not to mention many here run elbows and have a for a long while and no issues. Second, using tuneECU is not only easy, but if you use the tunes the others here use i see no reason to worry. they've been used by many with no issues. And so far no one has had a single issue using tuneECU even when a download fails, which some seem to think will ruin the ECU. But it's happened twice to me and all you do is reload the tune and you're fine. Dizze did it on purpose twice when we first started using it just to see what would happen and he found the same thing...try again and it will recover and load the tune. I've loaded tunes probably 50 times now and no problems. Even the 2 failed downloads weren't a problem.
So again, it's your call and i suppose anything can happen. A car may jump the curb and kill you while you're walking your dog, but i don't think that stops anyone from walking thier dog. Just understand one thing....with stright thru pipes the bike is friggin loud as hell. If you like that you're good to go, but thought you should know.
| 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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| | | AleXL4 | | Chaac | | | | Reg. Date | : | 17/09/2012 | | Posts | : | 571 | | Location | : | Gympie, Queensland, Australia |
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| | Posted : 06 Jun 2013 - 16:40 Post title : Re: Cat Eliminator (Re: daz) | | | BigNoseG wrote:
AleXL4 wrote:
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Hi Alex, all
Looking at getting either the Meerkat cat bypass or the David Platt cat by pass. Does anyone know:
Which is louder, has deeper rumble (sound bites for the Meerkat?)
Which was has the closer alignment to the TOR tune, and
Which is better made (build quality?).
Concern of Meerkat bypass not having mounting bolts. Problem keeping the exhaust rigid, rattles etc.
Meerkat has slightly bigger collector/director box, does this make a difference in balancing the pipes?
Loud is my main aim, yup.
Its pretty shallow I know but hey, your mid life crisis has to have a bit of noise to stop me falling asleep.
Thanks all
G |
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G'day G,
Meerkat Bypass/Crossover Decatter unit I purchased for AU $250.00.
No matter which set of mufflers I attached; being Triumph Standard, Triumph Short TORs, or modified / gutted Triumph Standard; they all provided a much deeper resonant sound as compared to having a Cat fitted or even straight through elbows.
Admittedly, I liked the system with the Cat fitted and the Triumph Short TORs, BUT I found the system was missing that depth of sound and strong torque especially after I had used this Decat assembly. My final selection was the Decat assembly, Triumph Standard mufflers, TORs tune via TuneECU complemented via a precision Dyno Tune.
As was explained to me at the time of the design & build, there are three things travelling through the exhaust system; an air pressure wave, a sound pressure wave, plus heat. When the exhaust valve opens, the sound wave is travelling down the pipe at the speed of sound, followed much, much, later by an oscillating air wave. This is the magical effect that HD have been able to capture and pulse into the hearts of their market followers.
I have tried the elbow system of bypassing the Cat assembly, but found that it's far too loud and sharp for this little black duck. The straight elbowed exhaust system has very little means of shattering the sound wave as it travels the length of the exhaust system. BUT, if you want LOUD, the elbows are the way to go.
Measured at 3 metres distance to rear of muffler, idle to 4000rpm on acceleration, with a calibrated db meter:
Decat, Standard muffler, 84db (Sweet), very deep
Decat, Triumph Short TORs, 109db (Bloody Loud), still very deep
I agree with Daz, the Decat (Elbows or Meerkat) is so light as compared with the CAT, there is no need for another chassis mounting point since it is quite rigid. I have used this system since July 2012 covering 25,000 klm with no ill effects or rattles etc.
And also agree, there are better tunes here on the forum for use with a Decatted Thunderbird via TuneECU.
Build and performance quality is what I expect of a Custom Stainless Steel designer and fabricator.
Happy hunting G
Cheers Alex
| Enjoying the Journey
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| | | daz | | Zeus | | | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 06 Jun 2013 - 17:24 Post title : Re: Cat Eliminator (Re: AleXL4) | | | Alex, where would you put the Meerkat volume wise between the cat and elbows ? If elbows are a 10 on the volume scale and the stock cat is 1, where would the Meerkat come in?
| 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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| | | Dougl | | Chaac | |  | | Reg. Date | : | 13/07/2012 | | Posts | : | 544 | | Location | : | Reno, Nevada, United States |
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| | Posted : 06 Jun 2013 - 17:44 Post title : Re: Cat Eliminator (Re: daz) | | | Alex, can you post a sound clip of the TORs/Meerkat?
Would you say that the deep mellow sound is the sound wave breaking up and the less restricted sound as metallic or explosiony like a machine gun?
I've heard one of the TORs/Platt crossover and it did sound loud but kind of tinny/metallic. This puts me off. I prefer a v-room sound to rat-tat-tat.
For comparison, the Dave Platt mufflers plus Platt crossover semed nice and deep. So I'm not keen on coupling the short TORs with the Platt crossover.
The TORs with the cat sound pretty deep but not terribly loud and not metallic. Would you say that the TORs with Meerkat has the same tone except louder?
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| | | BigNoseG | | Set | | | Reg. Date | : | 24/05/2012 | | Posts | : | 25 | | Location | : | New Zealand |
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| | Posted : 09 Jun 2013 - 09:41 Post title : Re: Cat Eliminator (Re: Dougl) | | | Thanks all,
Will go with the elbows and see just how loud it is got to be better than the current sewing machine.
Everything Triumph in NZ is very expensive (set of ToR's is US$800) so good to know you can't screw anything up majorly if the tune doesn't work. Will try and source a set of ToR's on EBay and add the tune myself.
Luckily I haven't got a dog so no need to worry about beng hit by a car :-), although I did fall 5m of a wall when I was in the garden so doing a tune is probably safer.
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| | | AleXL4 | | Chaac | | | | Reg. Date | : | 17/09/2012 | | Posts | : | 571 | | Location | : | Gympie, Queensland, Australia |
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| | Posted : 09 Jun 2013 - 16:27 Post title : Re: Cat Eliminator (Re: daz) | | |
daz wrote:
Alex, where would you put the Meerkat volume wise between the cat and elbows ? If elbows are a 10 on the volume scale and the stock cat is 1, where would the Meerkat come in? |
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G'day Daz,
On the scale you provided above, the Meerkat volume would come in at,
3 with Triumph Standard Mufflers, and
8 with Triumph Short TOR's
Oh, and not to forget, the complete elimination of the Singer, Pinnock, or Pfaff sewing machine sounds. 
Alex . . . .
| Enjoying the Journey
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| | | daz | | Zeus | | | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 09 Jun 2013 - 16:54 Post title : Re: Cat Eliminator (Re: AleXL4) | | | Thanks alex, but thats not what i meant. I meant volume between the meerkat and the stock cat with mufflers being the same. In other words either muffler with the meerkat, then the difference with that same muff but with the stock cat. In a nutshell, I'm trying to understand how loud the meerkat crossover is compared to the stock cat all else being equal.
| 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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| | | AleXL4 | | Chaac | | | | Reg. Date | : | 17/09/2012 | | Posts | : | 571 | | Location | : | Gympie, Queensland, Australia |
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| | Posted : 09 Jun 2013 - 17:16 Post title : Re: Cat Eliminator (Re: Dougl) | | |
Dougl wrote:
Alex, can you post a sound clip of the TORs/Meerkat?
Would you say that the deep mellow sound is the sound wave breaking up and the less restricted sound as metallic or explosiony like a machine gun?
I've heard one of the TORs/Platt crossover and it did sound loud but kind of tinny/metallic. This puts me off. I prefer a v-room sound to rat-tat-tat.
For comparison, the Dave Platt mufflers plus Platt crossover semed nice and deep. So I'm not keen on coupling the short TORs with the Platt crossover.
The TORs with the cat sound pretty deep but not terribly loud and not metallic. Would you say that the TORs with Meerkat has the same tone except louder? |
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G'day Dougl,
Do agree with the sound wave breaking up or shattering/scattering through the system with a longer path for the sound waves making this deep mellow sound, even though the path for the gas can be of less restriction.
The more you can make a sound wave breakup or scatter over a greater number of paths before it enters the atmosphere and travels off in a straight line, the more it can be tamed & subdued.
There is definitely no tinny/metallic sound from the Meerkat in any combinations. Only the Deep Subdued Throb of a gentle idle wanting to become, when mustered, a wholesome even Deeper V-ROOM.
TOR's with the cat are reasonably deep, and do become rather angry and sharp when turned on aggressively.
Whereas the TOR's with the Meerkat are even deeper, and when turned on via the twist grip, they provide an amazingly Deep, Loud responding ROAR, without any of the tinny/metallic episodes of straight through elbows. Still too much for this little black duck.
Only way the Meerkat system purrs or growls deeper, is when coupled with a 1700cc. 
Alex . . . .
PS. First chance I shall post some sound clips . . .
| Enjoying the Journey
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| | | AleXL4 | | Chaac | | | | Reg. Date | : | 17/09/2012 | | Posts | : | 571 | | Location | : | Gympie, Queensland, Australia |
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| | Posted : 09 Jun 2013 - 18:26 Post title : Re: Cat Eliminator (Re: daz) | | |
daz wrote:
Thanks alex, but thats not what i meant. I meant volume between the meerkat and the stock cat with mufflers being the same. In other words either muffler with the meerkat, then the difference with that same muff but with the stock cat. In a nutshell, I'm trying to understand how loud the meerkat crossover is compared to the stock cat all else being equal. |
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Sorry Daz,
I misunderstood your intent, but I shall have a go. 
Volume between Meerkat and stock cat, same mufflers (Triumph Standard).
Given the scale you used before, the Meerkat would be a 3.
Whether at an idle, accelerating, or travelling speeds, 3 means that the volume is only slightly louder; has a smooth deep pleasant sound; and no sewing machine sounds whatsoever.
No matter which mufflers used, the results came out the same between the Meerkat and the standard cat.
a. Deeper pitch,
b. Smooth pleasant sound quality,
c. Very little difference in loudness,
d. No sharp, tinny, or high pitched sounds, and
e. Definitely NO machine sound noises (Sewing Machine effect)
Rather hard to put into words the system needed for my wants & needs.
Wanted an exhaust with a full deep rich muted exhaust sound;
Could ride without earplugs, which were needed to cover the sewing machine sound effects;
Felt good at all speeds for whatever distance without any ill effects;
Would be appreciated by any neighbours, well most anyway;
Need to sound like an original English Triumph (In my mind anyway).
Yes, I still wear earplugs when touring, especially for helmet/wind noise.
Alex . . . .
PS. Sound clip to follow
| Enjoying the Journey
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| | | daz | | Zeus | | | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 09 Jun 2013 - 20:05 Post title : Re: Cat Eliminator (Re: AleXL4) | | | That sounds really good. My modded cat is probably a 2 if the stock cat is 1, so the meerkat it appears isn't load at all, or at least not nearly like the elbows. Thats pretty much what i expected because the flow pattern should be the same albeit the modded cat has a large chamber. I'd love to try one but I'm so happy with mine right now tho i would hate to change. This is when that old saying "if it ain't broke don't fix it" always comes back to bite you in the arse.
| 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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| | | Dougl | | Chaac | | | | Reg. Date | : | 13/07/2012 | | Posts | : | 544 | | Location | : | Reno, Nevada, United States |
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| | Posted : 09 Jun 2013 - 21:18 Post title : Re: Cat Eliminator (Re: AleXL4) | | |
AleXL4 wrote:
Dougl wrote:
Alex, can you post a sound clip of the TORs/Meerkat?
Would you say that the deep mellow sound is the sound wave breaking up and the less restricted sound as metallic or explosiony like a machine gun?
I've heard one of the TORs/Platt crossover and it did sound loud but kind of tinny/metallic. This puts me off. I prefer a v-room sound to rat-tat-tat.
For comparison, the Dave Platt mufflers plus Platt crossover semed nice and deep. So I'm not keen on coupling the short TORs with the Platt crossover.
The TORs with the cat sound pretty deep but not terribly loud and not metallic. Would you say that the TORs with Meerkat has the same tone except louder? |
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G'day Dougl,
Do agree with the sound wave breaking up or shattering/scattering through the system with a longer path for the sound waves making this deep mellow sound, even though the path for the gas can be of less restriction.
The more you can make a sound wave breakup or scatter over a greater number of paths before it enters the atmosphere and travels off in a straight line, the more it can be tamed & subdued.
There is definitely no tinny/metallic sound from the Meerkat in any combinations. Only the Deep Subdued Throb of a gentle idle wanting to become, when mustered, a wholesome even Deeper V-ROOM.
TOR's with the cat are reasonably deep, and do become rather angry and sharp when turned on aggressively.
Whereas the TOR's with the Meerkat are even deeper, and when turned on via the twist grip, they provide an amazingly Deep, Loud responding ROAR, without any of the tinny/metallic episodes of straight through elbows. Still too much for this little black duck.
Only way the Meerkat system purrs or growls deeper, is when coupled with a 1700cc.
Alex . . . .
PS. First chance I shall post some sound clips . . .
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Sounds great. And the price is right too. I'm into light scattering and absorption in the atmosphere. I'd be interested in what happens to a sound wave when it goes through an exhaust.
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