latte
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Registered: Jan 19, 2017 2:06:59 GMT -7
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Post by latte on May 24, 2018 20:14:51 GMT -7
I was flagged off the track for exceeding a 104 decibel limit. I have the akra decat and r1 headers with the stock slip on. I’m probably going to buy a slip on with packing or buy the race baffle that turns the stock slip on into a muffler with packing, but before that I decided to cut open the cat box. For tracks that have noise ordinances, I’m contemplating knocking out the cats and welding it back together to essentially turn it into a muffler box like you’d see on the R6. The R6 has the cats in the headers and its muffler breadbox is simply some extra pipe routing and somewhere to mount an exup for noise emissions. Obviously I’d safety wire the exup valve on ours open. Top  Bottom  Pipes with cats in them   Initially I cut around the bottom of the box but the pipes within are welded on all sides, so I was only able to pull off the back half. Looks like I can open it up a little more to get a clear shot with a drill and a hole saw. You may be able to knock the cats out without cutting it open but I was curious how it looked inside. Will document best areas to cut later- I’ve run out of cutting discs lol. |
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ikranmakto
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Registered: Dec 1, 2017 23:13:03 GMT -7
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Post by ikranmakto on May 24, 2018 23:42:39 GMT -7
Nice grinder work latte, it's interesting to see the cross sectional area and inside workings of the OEM catalytic converter. I know it's a personal choice to totally remove the cat on the FZ/MT 10, but I just can't bring myself to do it as I am not a big fan of loud bikes. I have an R6 track bike and you certainly know it when you've forgotten to put your ear plugs in when you open it up on the track. I'm baffled (no pun intended) why no-one hasn't engineered an aftermarket replacement cat for this bike, one that doesn't silence one of the best sounding motorcycle engines ever manufactured. Look forward to seeing how this project progresses. |
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osiris10012
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Post by osiris10012 on May 25, 2018 6:45:38 GMT -7
Impressive how much sound suppression the stock box gives you when it appears to be a simple 2 chamber design with 2 cats.
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mrhix
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Post by mrhix on May 25, 2018 7:06:49 GMT -7
Has anyone used the slip-in cats that Akrapovic sells for their pipes (part number P-KAT-008/3 for the FZ-1)? They might be a solution for excessive noise and emissions check.
Cheers,
MrHix
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latte
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Registered: Jan 19, 2017 2:06:59 GMT -7
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Post by latte on May 25, 2018 7:54:27 GMT -7
My first thought was to use a drop in akra cat as that’d do the trick, but I don’t think any are currently compatible with fz10 exhausts.
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latte
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Post by latte on May 27, 2018 13:19:32 GMT -7
Some progress. Part way into drilling the cats I decided it’d be easier to just lop the pipes off from the inside. Opened up some more so I could get at the piping.    Once the tubes have been cut out, any remaining cat material falls right out. Outer shell pieced back together, just need to have it welded. Some grinding and cleanup later and you ought not be able to tell it was gutted inside.  |
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Deleted
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Registered: Nov 21, 2024 1:33:21 GMT -7
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Post by Deleted on Jun 4, 2018 23:01:58 GMT -7
That might not be a great idea for power. Remember tuning an exhaust system takes a lot of R&D. It doesn't seem like you altered much, but might have a negative effect on cylinder scavenging. If you had only removed the cats, then no change. But you changed that chamber now. Only way to know is a dyno run back to back, to confirm it's not having the wrong effect. Good luck.
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solo
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Post by solo on Mar 19, 2019 14:34:21 GMT -7
Thinking of doing the same job.. how is the sound and did you get a dyno run on it ?
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lotust251
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Registered: Jun 1, 2019 5:39:49 GMT -7
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Post by lotust251 on Jun 2, 2019 14:19:46 GMT -7
nice work. I went an easier route
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Post by RedAndBlack on Jun 3, 2019 0:45:56 GMT -7
I know this is an old thread but I would think this would cause a lot of problems. If you just hallowed out the cat pipes, I think it's a good idea. But completely removing the pipes to create that chamber is a bad idea. Exhaust gases are under pressure leaving the engine. That chamber is going to create a lot of turbulent air that could possibly whirl around in the inside of that chamber rather than leave the exhaust. Causing more back pressure and reducing efficiency and overall power.
At least that would be my thoughts knowing what I know about aerodynamics. You want smooth, straight surfaces that move the air along like water.
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fraktv
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Post by fraktv on Dec 21, 2023 19:51:38 GMT -7
Sorry to resurrect this thread. It looks like the cats are in line of sight to the inlets. I don’t think the box needs to be cut open. A long wood drill should do the trick! Anyone else gut the exhaust box from the inlets?
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subkrato
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Post by subkrato on Jan 9, 2024 9:14:32 GMT -7
Sorry to resurrect this thread. It looks like the cats are in line of sight to the inlets. I don’t think the box needs to be cut open. A long wood drill should do the trick! Anyone else gut the exhaust box from the inlets? Reminds me of gen 2 FZ1s. There was baffling in the headers pipe. When you took the cat off, you can see them, so you would take a drill to them, start the bike and material would blow out. I’m sure you can do that with this, but what’s the point honestly |
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3genx
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Post by 3genx on Feb 17, 2024 4:03:53 GMT -7
Sorry to resurrect this thread. It looks like the cats are in line of sight to the inlets. I don’t think the box needs to be cut open. A long wood drill should do the trick! Anyone else gut the exhaust box from the inlets? |
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