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Discussion Starter #1 (Edited)
I'm starting this new thread for us to share coring ideas and initiatives. The first photo serves as a base to shows what the guts of our stock canisters look like prior to any internal surgery. The following photos show some of Johnny's work where he focused on flow as he practically dissembled the whole stock cannister and re-built the interior plumbing. Phil as we know, has done a lot of fine work in this area however, to the best of my knowledge, he focuses on sound by removing the cat and exit baffle without major internal modifications. Consequently, this is an opportunity to study the stock canister and offer engineering ideas and solutions to address both flow and sound.
 

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I'm a computational fluid dynamicist by profession and would love to model one of these. Too bad I don't have the pre-processing or computation bandwidth to do it nor the physical specimens to create CAD models, but maybe one day...


In what I'm guessing is Johnny's work (pics 2&3), it seems that those could benefit from adding sound deadening material to improve sound characteristics (reducing resonance and high pitch, tinny tones), similar to the effect of adding resonators to car exhausts. Depending on how much or how dense you pack the material, it could be tuned to some extent for the sound level.


I'm not familiar with Johnny's work - @DarR any links to source? Wonder how loud they are.
 
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Discussion Starter #3 (Edited)
@DJ Shrug
You can look him up on the Panigale / 1299 forum under Johnnyflies.
He actually did add sound deadening material but told me that although it flows much better, it's not louder than stock.
What I'm really looking for with this thread is to stimulate ideas, suggested parts and materials.
 

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I have removed my stock EU version exhaust whiling to coring it



I took it to a guy who is specialized on sports cars exhaust system , not motorcycles, but have done a few motorcycles exhausts also. By taking a look at it he didn’t like the ideia of opening without knowing what was there, and after a few minutes looking, turning around, he suggested to just open a window on this curve:



He told me that if we opened it could have resonance and the noise probably wouldn’t be nice, so we did as he suggested. Now I’m looking forward for the weekend to put it back on and test




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Looks like it has potential for success! Relatively cheap Euro4 option that seems simple.
 

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Discussion Starter #7
@Cotonete
Good luck with this project. I think the probability for success is very good.
The Euro's center piece can be opened and closed repeatedly without visible damage.
Unlike the US version canisters where the biggest challenge for us with is hiding the surgical scars.
Please take lots of photos once it's open. We'll all be following your experiment with interest.
 

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Thanks DarR, but Actually I won’t open if it works out the way I want. The specialist recommended me to just open a hole to release more pressure as this:



I’ll take more pictures and will try to make a video of the result once it is assembled.


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Well, I can’t really say it made difference, but it certainly did, I won’t make that hole bigger, I think it is good enough for me, but if I would do this again, I would make that hole twice bigger.

Here is some pictures and video.







I don’t know how to post videos.



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Hy guys, I have found the reason for the lack of exhaust noise on my bike, it is this valve:







It is default opened, but as soon as I acelerat it closes, I think it is for torque increasing.



Does US version has this kind of valve? Has anyone eliminated that? Is is necessary to remap or use a rapid bike for instance?
 

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Discussion Starter #11
Hy guys, I have found the reason for the lack of exhaust noise on my bike, it is this valve:

It is default opened, but as soon as I accelerate it closes, I think it is for torque increasing.

Does US version has this kind of valve? Has anyone eliminated that? Is is necessary to remap or use a rapid bike for instance?
Yes my valve servo stopped working way back when. My Ducati tech removed it entirely and the dealer gave me a new one under warranty. BTW, it's still in its box somewhere in the garage. If disconnected, the dealer will see a DDA error but it will not show up on your display.
 

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Discussion Starter #13 (Edited)
Have you notice a lack of torque back then?
I have not noticed a lack of torque but theoretically I should have to account for the AFR leanness in that part of the RPM range where the valve previously closed for noise around 4~5k then reopens at about 6~7k. Moreover, the addition of a RapidBike unit and improvement in that RPM range was very noticeable. Probably more so since it had to compensate for the leaner AFR due to the absence of the closed valve. I'm just best guessing here.
 
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I’m gonna follow that path. In December I’m gonna be in Orlando, I will take advantage to buy a rapid bike. Thanks DarR.


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