papac2000

 Papac! certainly sounds raspier & deeper!
So, please detail what you did from V1. 2" outlet? Did you have to modify the end cover?
Well done!
Cheers,
Steve

 
 
End cover is unchanged. I carefully cut behind the second weld and slid the original outlet tube out of the bulbous shaped area at the rear of the muffler. The 2in pipe needed to be squished some at one end to make it more oval to pass through the decorative cover. I left the lower bracket that the cover mounts to but cut the upper one off and transferred it to the new outlet. I have also "breached" a hole into the cat chamber about 1 1/2in by 3/4in. I did not want to open the panel again. If I was to do this all again I would holesaw a 1 3/8 or 1 1/2in hole into the cat chamber and insert a section of tube salvaged from the "s" bend. Judging from the power gain, there is a lot of pent up pressure in that middle chamber!

http://photobucket.com/share/links?u=http%3A%2F%2Fs1380.photobucket.com%2Fuser%2FPapaC2000%2Fmedia%2FMobile%2520Uploads%2F20150228_131322_zpsrdloeyt2.jpg.html
 
For the life of me I cannot embed from mobile. Can a mod fix for me?

 
Thanks. Overlay of V1 and V2 dyno runs.

 
FJ 09 MT 09 Tracer exhaust mod V2.0:
Will detail more about the new mods but heres the sound check. Comments?
Oh, and for what it's worth. 112whp/68wtq now
Just a listening note: sounds best on PC speakers or headphones. On my mobilephone speaker you don't get the proper effect

I've opened the outlet to 2in and added another hole to the divider from the cat chamber to the rear chamber. Big results! Will follow up with new idle/rev sound check vids and dyno vid/chart. Extremely pleased with the results and will not be making further revisions.
 

 

Honestly I usually start my pulls from 4 or 5K. I tested this version and from 4000 up til 10,000 there was no loss in tq and a gain of a whopping 1hp. I am not after making power, but yeah I don't want to hurt tq either. On the hunt now for a piece of stainless tubing about 1.75in OD for a bigger outlet....can't help it.
 

 YES, that's better, no fan! That sounds great for stock modified V1! What's on for V2? Carbon tip? Bigger outlet? Play with the guts one more time?
C'mon papac! Get the grinder out!

 
It will be a while perhaps, after I get a chance to ride it as is. V2 would be a bigger outlet. V2.5 might mean opening it back up and adding another opening to the cat chamber. See how it goes

Ok, sound test 2 was gooder (worth doing me thinks). I like the sound at idle, but I hear the intake noise before the exhaust when revving it up. Maybe it was the height of the camera mic?

 
 
Could be that....turns out there's a reason most sound clips of exhaust systems are crummy and don't sound proper. Because it's harder than you'd think! LOL
Anyway, hope it kinda gets the idea across.

 
Sound check without fan...but on my damn phone as the other camera was borrowed

I'll call this Version 1.0 as there's a chance I may tinker with it further yet.

Sounds better, but I can not tell if it is loud enough to hear at speed. I like to hear my engine in the twisties.

 
 
If you do what I did, plus a second tube into the cat chamber and a larger outlet it would be for sure. As it is the change is modest but definitely an improvement

 
 
 
 
Here's a sound clip. Could be better but it's too damn cold to roll it outside (-23C)
 
 

The panel that was rewelded is sloped down. The piece of S pipe i am holding in the pic is removed all together. The theory I was working on is the flow will come out the top center pipe and deflect off the angled top and out the exit. I cut the exit on an angle to take advantage of this redirection. Just my thoughts for what they're worth. Can't really take more pics...I put it back on the bike.

I imbedded one of your pictures in the first post, I hope that was ok?

 
Of course, and thank you. I have no luck with posting pics using my phone. I only seem to be able to embed properly on my pc in the non-mobile version of the site.

I had someone suggest that at my shop today Steve. As I mentioned, there are a few ways you could do this. I wanted to have the whole internal volume available to keep a deeper tone and connecting those together would cut the volume of air/gasses considerably. It might flow better though.

It may also make it sound very loud too! Either way papac, good work!

 
That was my concern...although I think with my current version there is room for more sound yet.

Fantastic, I need to listen to the sound now.

 
I will try to make another vid just idling and a few revs. The dyno video is doesn't get the idea across I know.

I had someone suggest that at my shop today Steve. As I mentioned, there are a few ways you could do this. I wanted to have the whole internal volume available to keep a deeper tone and connecting those together would cut the volume of air/gasses considerably. It might flow better though.

The change in sound on this rendition is very modest. For those after a more dramatic change, I suggest the second tube through the baffle and the bigger outlet.

Rear chamber with S bend removed. Stock muffler is 3 chambered. Exhaust exits the cat and enters the middle chamber and then into the rear chamber through the top tube. Normally it would then be forced back to the front chamber through the bottom tube and then turn around and travel back through a glass packed tube on the left and out through the S bend outlet.

I knew the hp would change little to none. In my mind this mod was always about the sound. The bike has more power than I'll be able to use as it is. The change was +1hp and tq was essentially unchanged. I was just hoping not to decrease power with this experiment. ...lol. If I try the "more aggressive" version I will redyno. I suspect it would work a bit better.

There are more aggressive ways to do this, and I thought about it. This method is the quick and easy. I considered adding a second tube to the divider/baffle from the second chamber (cat area) into the rear chamber ( like the one located top center) as well as putting a larger outlet. I think that would be the ultimate without getting crazy. That would maintain the cat and still increase sound and also flow. I've left the stock tip for now. I haven't ridden it yet, and may try that AFTER the 1000km check at the dealer.

2015 Yamaha FJ-09 MT-09 Tracer Dyno Session 2:

 
Cut open a panel on the top into the rear chamber behind the mount. Removing this section of pipe allows gasses to exit without going back to the front and returning through a glasspacked tube (S shaped).

What about forgoing the oring and transferring the crush washer to the new bolt from the original?

Got a part # for this NAPA plug?