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Old May 22nd, 2015, 06:28 PM   #1
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Exhaust butterfly parameters

Does anyone know what these are? It seems like it's only open fully when you're near WOT...

Here's the million dollar question though:

Is it there for performance or simply noise reduction?

Cause if all it's doing is stopping the sweet sound of my V-Twin reaching my ears I'll have it off faster than you can say "Jack Robinson"..

Can anyone who has removed it comment on the effects?

Cheers!
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Old May 22nd, 2015, 08:14 PM   #2
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I once took off my muffler and watched it move while revving the engine. At idle it is open. As soon as you crack the throttle it closes. I believe it opens again after you reach a certain RPM.

It's for noise reduction only, I believe. I disconnected the cable on mine and now it sounds better and feels like it runs better at low RPM/throttle openings.
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Old May 22nd, 2015, 09:19 PM   #3
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Brilliant. Thanks Kuksul - off it comes then!
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Old May 22nd, 2015, 10:59 PM   #4
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Removing the plate does make the bike louder, and a little more free reving.. However it does reduce a little Tq down low, and you'll notice your exhaust will pop a little on decel.

Don't disconnect the cables, just remove the two little screws holding the plate on the shaft.. That way it won't throw a code.
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Old May 22nd, 2015, 11:22 PM   #5
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Cheers Zibbit. Is it reversible if you remove these screws? I had fully intended to remove the cable to start, but if it's just as easy to remove the plate, I think I'll have a go at that..
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Old May 23rd, 2015, 11:19 AM   #6
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The screws on mine are welded on it looks like
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Old May 23rd, 2015, 01:38 PM   #7
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Can one of you guys do a before and after of the sound. If it works I might just take mine off too!
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Old May 23rd, 2015, 02:59 PM   #8
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I just disconnected mine after reading this, definitely louder through all rpm range and I could tell immediately, no codes but feels like less torque although it might be psychological after reading that it might, maybe in midrange and up?. it sounds great without being obnoxious, it sounds like a motorcycle now. I do not have any decel popping either. Just took off the two screws, removed plate and turned valve by hand so I could disconnect the cable, took less than two minutes. I read on an ebay sellers description that up to 2012 there is a module for no codes, he says 2013-2014 module not needed, so if you're buying one from somebody else they're ripping you off. It does sound waaaaay better and if you don't like it, it'll take just a minute to hook it back up. Here you go! Listen with good headphones or good speakers. :-D


BEFORE:


AFTER:

Last edited by Pabst; May 23rd, 2015 at 04:25 PM.
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Old May 23rd, 2015, 03:52 PM   #9
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Thanks for that post. Great comparison. Cheers
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Old May 23rd, 2015, 05:41 PM   #10
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Quote:
Originally Posted by Pabst View Post
I just disconnected mine after reading this, definitely louder through all rpm range and I could tell immediately, no codes but feels like less torque although it might be psychological after reading that it might, maybe in midrange and up?. it sounds great without being obnoxious, it sounds like a motorcycle now. I do not have any decel popping either. Just took off the two screws, removed plate and turned valve by hand so I could disconnect the cable, took less than two minutes. I read on an ebay sellers description that up to 2012 there is a module for no codes, he says 2013-2014 module not needed, so if you're buying one from somebody else they're ripping you off. It does sound waaaaay better and if you don't like it, it'll take just a minute to hook it back up. Here you go! Listen with good headphones or good speakers. :-D


BEFORE:


AFTER:
It says your video clips have either been moved or deleted ?
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