Help 2011 Bonneville T100 Bafflectomy

[leparrot]

Hello Everybody,
My first post.
I need your help. My bike is a 2011 Bonneville T100 EFI air cooled.
I have preformed a first stage baffectomy by drilling out the first baffles. PIC A represents the start. PIC B is the first baffles out.
This has not changed much to my ears except giving me just a bit of base growl. I am a bit disappointed and I want more to a point of TORs.
My question is where do I go from here as I am not sure? I would like to go in small steps so as not to go to a point of no return. I just want more growl but not unbearable for others.
So my question is do I drill? If so where (PICS C&D) ? Do I have another Baffle to take out first? (SEE PICS) If so how? Please let me know of your experiences with this type of silencer for this specific year.
Hope the included pics illustrate so you can see my progress as to where I am now and where you think I should go. I appreciate all your help and thx in advance.
M

 

[CarlS]

I did six bafflectomies on Triumph Bonnevilles through 2004. However, Triumph changed the silencers and I have no experience with the newer Bonnevilles. I do not know how the newer silencers are constructed. What size bit are you using to drill out out the baffles? I used a 3/4 inch bit. If I were experimenting, I would keep drilling using larger bits.

 

[leparrot]

I did six bafflectomies on Triumph Bonnevilles through 2004. However, Triumph changed the silencers and I have no experience with the newer Bonnevilles. I do not know how the newer silencers are constructed. What size bit are you using to drill out out the baffles? I used a 3/4 inch bit. If I were experimenting, I would keep drilling using larger bits.

The first one I drilled out with a hole saw 1 1/8 (29mm). My question is do I just drill with a normal drill bit now because if there are other baffles inside I do not know where to attack to get them out.
It seems to me there are 2 or 3 more (outer large first ring, another smaller inside the outer and then the smaller hole you see at the end)
There are 2 places to drill inside everything. As you can see from the photo (PIC-D) there is a small opening inside the large opening which is about 23 cm (9inches) to contact. The other is about 10cm to contact. So where do I go from here? Drill to the left at the plate around the smaller opening or right in the smaller opening? If I had an xray of the thing I could see what's going on in there more clearly but alas. I thought maybe some of you did that particular year and type already.
Thx, MM

 

[ManInTheJar]

The first one I drilled out with a hole saw 1 1/8 (29mm). My question is do I just drill with a normal drill bit now because if there are other baffles inside I do not know where to attack to get them out.
It seems to me there are 2 or 3 more (outer large first ring, another smaller inside the outer and then the smaller hole you see at the end)
There are 2 places to drill inside everything. As you can see from the photo (PIC-D) there is a small opening inside the large opening which is about 23 cm (9inches) to contact. The other is about 10cm to contact. So where do I go from here? Drill to the left at the plate around the smaller opening or right in the smaller opening? If I had an xray of the thing I could see what's going on in there more clearly but alas. I thought maybe some of you did that particular year and type already.
Thx, MM

The EFI mufflers are really restrictive internally. The short stinger you removed in the bafflectomy is part of the equation but thete is also a CAT at the inlet end of the muffler and a small diameter internal tube running through the centre of the muffler. I have some pictures to illustrate this which I'll post later.

A better route might be to go for aftermarket mufflers, I had Feked stainless steel mufflers on mine and they gave a lovely noise without scaring the neighbours. They needed a link pipe which was also from Feked. The whole set-up looked stock when fitted ( see a picture in my album). The link pipe was welded to the muffler to make it a bit neater but you could just use a clamp.

Here is a link to the Feked mufflers which are "cheap as chips" :

https://www.feked.com/hinckley-triumph-bonneville-premium-vickers-silencers-complete-kit.html

 

[CarlS]

The EFI mufflers are really restrictive internally. The short stinger you removed in the bafflectomy is part of the equation but thete is also a CAT at the inlet end of the muffler and a small diameter internal tube running through the centre of the muffler. I have some pictures to illustrate this which I'll post later.

A better route might be to go for aftermarket mufflers, I had Feked stainless steel peashooters on mine and they gave a lovely noise without scaring the neighbours. They needed a link pipe which was also from Feked. The whole set-up looked stock when fitted ( see a picture in my album). The link pipe was welded to the muffler to make it a bit neater but you could just use a clamp. I'll see if I can find a link to these mufflers.

What you did, is how I installed mid 1960's Triumph silencers on my 2003 T100. I used a clamp to secure the adapter/link pipe since I am no welder.

 

[ManInTheJar]

The EFI mufflers are really restrictive internally. The short stinger you removed in the bafflectomy is part of the equation but thete is also a CAT at the inlet end of the muffler and a small diameter internal tube running through the centre of the muffler. I have some pictures to illustrate this which I'll post later.

A better route might be to go for aftermarket mufflers, I had Feked stainless steel mufflers on mine and they gave a lovely noise without scaring the neighbours. They needed a link pipe which was also from Feked. The whole set-up looked stock when fitted ( see a picture in my album). The link pipe was welded to the muffler to make it a bit neater but you could just use a clamp.

Here is a link to the Feked mufflers which are "cheap as chips" :

https://www.feked.com/hinckley-triumph-bonneville-premium-vickers-silencers-complete-kit.html

I have attached three images showing the the CAT and internal construction which restrict the gas flow at the inlet end of a T100 EFI muffler.

The first image shows the muffler with the inlet end cut off.

The second image shows the CAT and end cone removed.

The third image shows the view down the inside of the muffler looking from the inlet end.

You can see that a lot of work is required to get a good gas flow and sound.

 

[CarlS]

That is amazingly restrictive! Wow! Thanks for the pics.

 

[Rocky]

Wow, it's amazing what's in there!

 

[leparrot]

I have attached three images showing the the CAT and internal construction which restrict the gas flow at the inlet end of a T100 EFI muffler.

The first image shows the muffler with the inlet end cut off.

The second image shows the CAT and end cone removed.

The third image shows the view down the inside of the muffler looking from the inlet end.

You can see that a lot of work is required to get a good gas flow and sound.

Thx for the pics. However I do not have the same on my bike. These are the the cone ones no? I have the others from 2011 (see pic). Is it the same inside however ??? What is EFI ?
Does this mean I can no longer go further to get what I want. If so where do I drill ? I the small hole?
I am well aware of the option "after market" and know what I want (Mecatwins) but monies funny no and don't need to shell out the 975€ at the moment if you know what I mean. Therefore this project.
Thx, M

 

[ManInTheJar]

Thx for the pics. However I do not have the same on my bike. These are the the cone ones no? I have the others from 2011 (see pic). Is it the same inside however ??? What is EFI ?
Does this mean I can no longer go further to get what I want. If so where do I drill ? I the small hole?
I am well aware of the option "after market" and know what I want (Mecatwins) but monies funny no and don't need to shell out the 975€ at the moment if you know what I mean. Therefore this project.
Thx, M

Hi, this muffler is the same as on your bike. It is off this bike:

The pictures are of the muffler with the inlet end cut off, the cone you see is inside the muffler and not visible unless you cut up the muffler. The second picture has the uncut matching muffler in the background lying on the workbench.

To save money you could use a very long drill to make holes in the baffle rings which surround the centre tube (last picture) but the CAT will still restrict the flow and sound.

It is worth looking at the FEKED mufflers as the price is low but the quality is high. They are stainless steel but can be polished to resemble chrome.

You can hear them near the end of this video I made when selling the bike.

View: https://youtu.be/dguBl4qsmFg

 

[leparrot]

Hi, this muffler is the same as on your bike. It is off this bike:

The pictures are of the muffler with the inlet end cut off, the cone you see is inside the muffler and not visible unless you cut up the muffler. The second picture has the uncut matching muffler in the background lying on the workbench.

To save money you could use a very long drill to make holes in the baffle rings which surround the centre tube (last picture) but the CAT will still restrict the flow and sound.

It is worth looking at the FEKED mufflers as the price is low but the quality is high. They are stainless steel but can be polished to resemble chrome.

Thx. I'm still confused. Do you mean to make holes around the plate around the small hole on top but not actually in the small hole itself? I might add to reach the end inside this small hole it is about 24cm to contact. To the plate around it about 12cm. Thx,M

 

[ManInTheJar]

Thx. I'm still confused. Do you mean to make holes around the plate around the small hole on top but not actually in the small hole itself? I might add to reach the end inside this small hole it is about 24cm to contact. To the plate around it about 12cm. Thx,M

Yes that's right, add several 8 or 10mm holes in the plate. You can take small steps by adding extra holes or enlarging them until you get the sound you want. There is at least one more plate like this at the other end of the muffler if you cannot get the sound you want you could use a very long drill bit and drill matching holes through this also.

 

[leparrot]

Yes that's right, add several 8 or 10mm holes in the plate. You can take small steps by adding extra holes or enlarging them until you get the sound you want. There is at least one more plate like this at the other end of the muffler if you cannot get the sound you want you could use a very long drill bit and drill matching holes through this also.

Thx. So I leave the small opening untouched then? Also when you say "at the other end of the muffler" do you mean I have to take it off and attack the other side of the silencer if need be? Greatly appreciated. Thx, MM

 

[ManInTheJar]

Thx. So I leave the small opening untouched then? Also when you say "at the other end of the muffler" do you mean I have to take it off and attack the other side of the silencer if need be? Greatly appreciated. Thx, MM

Yes, leaving the small opening untouched will let you take small steps you desire by adding holes as required. You cannot directly attack the other end without cutting and removing the end of the muffler. The easiest way to drill the plate at the other end is to use a drill bit which is almost as long as the muffler and insert it through the holes you drill in the first plate which you have already exposed - but you might not need to do that if you are happy with the sound after drilling the first plate.

 

[leparrot]

Yes, leaving the small opening untouched will let you take small steps you desire by adding holes as required. You cannot directly attack the other end without cutting and removing the end of the muffler. The easiest way to drill the plate at the other end is to use a drill bit which is almost as long as the muffler and insert it through the holes you drill in the first plate which you have already exposed - but you might not need to do that if you are happy with the sound after drilling the first plate.

Ok got it thanks. Will attack as soon as I can get some sort of extension for the drill bits. Also... will I need a remapping after or will all be fine as is?

 

[ManInTheJar]

Yes that's right, add several 8 or 10mm holes in the plate. You can take small steps by adding extra holes or enlarging them until you get the sound you want. There is at least one more plate like this at the other end of the muffler if you cannot get the sound you want you could use a very long drill bit and drill matching holes through this also.

Ok got it thanks. Will attack as soon as I can get some sort of extension for the drill bits. Also... will I need a remapping after or will all be fine as is?

It should be ok without a remap unless you drill enormous holes. If it does affect the way the bike runs then a map for an Arrows or similar would be a good option. Here is a list of available T100 maps:
https://m.box.com/shared_item/https://app.box.com/s/pusg6v7nyd/view/541590770779

 

[leparrot]

It should be ok without a remap unless you drill enormous holes. If it does affect the way the bike runs then a map for an Arrows or similar would be a good option. Here is a list of available T100 maps:
https://m.box.com/shared_item/https://app.box.com/s/pusg6v7nyd/view/541590770779

Ok thx. Let you know the final results. Anyway if I mess it up I have another pair exactly the same that I bought on purpose for replacement. M

 

[leparrot]

Well this is where I am at now.(See pic). Punched some holes in the large plate and still not a great change. It looks now like there are 2 other baffles I have to get out (cylinder in forefront left and cylinder behind on right). Or do I just keep going deeper inside punching holes further in?
How far before I hit the C converter I wonder as that I do not want to do. Any input encore? Thx

 

[CarlS]

I think I would just install aftermarket pipes.