Exhaust Butterfly Valve

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Racer-X
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Re: Exhaust Butterfly Valve

Post by Racer-X » Mon Jan 13, 2020 8:50 pm


Interesting ... I can't help but think that if the valve closed as it does on the ZX10R then surely there would be something to see on the dyno.
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Re: Exhaust Butterfly Valve

Post by vcyclenut » Tue Jan 14, 2020 12:08 pm


Racer-X wrote:
Mon Jan 13, 2020 8:50 pm
Interesting ... I can't help but think that if the valve closed as it does on the ZX10R then surely there would be something to see on the dyno.
they don't really say what rpm and throttle position it closes down , could just be at part throttle
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Re: Exhaust Butterfly Valve

Post by Jimmymac » Tue Jan 14, 2020 3:58 pm


Maybe it's part of the engine brake? Just a diesel guy talking here.
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Re: Exhaust Butterfly Valve

Post by vcyclenut » Tue Jan 14, 2020 8:11 pm


Jimmymac wrote:
Tue Jan 14, 2020 3:58 pm
Maybe it's part of the engine brake? Just a diesel guy talking here.

no for sure not,
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Re: Exhaust Butterfly Valve

Post by black-k1 » Wed Jan 15, 2020 7:26 am


From this side of "the pond" I understood the butterfly valve was there to help pass the EU noise regulations. I think the noise level is measured at a specific rev range and the valve is designed to cut the noise output at that rev range.
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Re: Exhaust Butterfly Valve

Post by dan_h2sx » Fri Jan 17, 2020 11:26 am


Fast5ru wrote:
Sun Jan 12, 2020 2:02 pm
Hello from Russia,
I have done removal of db killers:



You need to drill out rivets, take off carbon fiber end, brake out weld traces that holds baffles in place , take them out, put in carbon fiber end cap and rivet it in back.

Result would be more deep expensive bass sound.
Enjoy it.
Complete removal is illegal where I live :(
I'd rather shorten them but the whole process of getting them out seems rather complicated. I don't wanna f... up the slip on :help:
I don't have a rivet gun either :(
But I like the sound a lot :D
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Re: Exhaust Butterfly Valve

Post by Shin_Molina » Fri Jan 17, 2020 8:32 pm


dan_h2sx wrote:
Fri Jan 17, 2020 11:26 am
Complete removal is illegal where I live :(
I'd rather shorten them but the whole process of getting them out seems rather complicated. I don't wanna f... up the slip on :help:
I don't have a rivet gun either :(
But I like the sound a lot :D
I am from Spain and removing the dbkiller here is illegal too.

I currently have an Ixil RC1 that is not too loud but it is not CE approved (equally illegal). The H2 SX is not a loud bike even straight piped as long as the catalytic converter is not removed.

I don't think you will get pulled over with the dbkiller removed and it looks very simple to remove them. :cheer: :clap:
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Re: Exhaust Butterfly Valve

Post by Prof J » Wed Jan 22, 2020 3:13 am


David, have you seen or heard of the OEM can being de-catted (also with removing the cat in front of the OEM can), and how that sounds?

Performance wise - tune wise, do you think it'd be close to a basic aftermarket can?
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Re: Exhaust Butterfly Valve

Post by Shin_Molina » Wed Jan 22, 2020 9:03 am


Prof J wrote:
Wed Jan 22, 2020 3:13 am
David, have you seen or heard of the OEM can being de-catted (also with removing the cat in front of the OEM can), and how that sounds?

Performance wise - tune wise, do you think it'd be close to a basic aftermarket can?
What I've seen about the H2 SX de-cat is a product from Ebay that requires the original pipe to be cut. Removing the cat could make much more sound, I had an straight piped MT07 and it was crazy loud even with a dbkiller on.

https://www.ebay.es/itm/Kawasaki-H2-SE- ... Sw1YRcoIjO

I think that de-catted setup could be similar to installing the ZX10 headers as Vcyclenut and other people do. Having a full de-catted system with a proper air filter will make some more HP compared to an aftermarket slip-on for what I've seen in Vcyclenut results:

https://www.vcyclenut.com/kawasaki-h2-sx.html

Also, Brock's only fitted a slip-on and ended with serious HP gains. As you see, I'm only talking after seeing other people results, I don't have any tools to test the bike and haven't seen any de-catted bike. What I can recommend you is that this bike makes serious HP even with the cat on and just a slip-on.

My aftermarket exhaust has a fixed dbkiller and is not much louder than stock but sounds beatiful at WOT and shifting. Here are some samples at idle and revving:

viewtopic.php?f=8&t=1539&p=15140&hilit=ixil#p15140
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Re: Exhaust Butterfly Valve

Post by Prof J » Wed Jan 22, 2020 9:56 am


Shin_Molina wrote:
Wed Jan 22, 2020 9:03 am
Prof J wrote:
Wed Jan 22, 2020 3:13 am
David, have you seen or heard of the OEM can being de-catted (also with removing the cat in front of the OEM can), and how that sounds?

Performance wise - tune wise, do you think it'd be close to a basic aftermarket can?
What I've seen ...
Shin_Molina, thanks.

I've got a set of ZX10 headers and can, mid-pipe from David. Still waiting for proper weather to install. Last summer I bought a used OEM S2SX can to dissect, which I still need to get started. So many options and so little time.

I would like about the same quietness as OEM, so I may have to do some extra packing.
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