Active Exhaust
Active Exhaust
Tourer
Joined: Jan 2012
Posts: 373
Likes: 90
From: australia
I see your from the UK,, I am from Australia,, we , (international models ), have the Active Exhaust Valve thingy ... Its part of the EPA noise rules etc ,,,
The easy fix, if you dont like it, is, go to dealer, and with there workshop computer , they can disable it in the open position..
If you go with aftermarket pipes in the future, (ie, no active exhaust valve), all you do is zip tie the cable that goes to the active exhaust valve ,(which was disabled by dealer), somewhere safe and out of the way... Hope this helps ....
The easy fix, if you dont like it, is, go to dealer, and with there workshop computer , they can disable it in the open position..
If you go with aftermarket pipes in the future, (ie, no active exhaust valve), all you do is zip tie the cable that goes to the active exhaust valve ,(which was disabled by dealer), somewhere safe and out of the way... Hope this helps ....
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
If you look in the PV tables you will see some duty cycle tables for how much or when it is open or partially open ...not sure, mine is permanently shut, it being in a box cos I have a full 2-1
Thread Starter
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Cruiser
Joined: Aug 2015
Posts: 113
Likes: 4
From: Dartmouth, Devon, UK
Thanks Gordon, So does it divert both cylinders to one silencer/muffler ? In which case the noise reduction might only be 3dB ? And with open pies not much at all ??
Last edited by Dave Cawley; May 2, 2016 at 01:10 PM.
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
The exact dynamics of the air flow I don't know but I doubt if it would half the sound ...you still have two cylinders pushing out exhaust gasses.
I would expect an increase in back pressure when it is active (closed) so it may improve torque at lower revs but I've never actually watched it or worked out when it shuts and opens.
When I did my stage 1 and replaced the mufflers (and built in cats) for V&H slip-ons, I tried the active exhaust on and off and don't actually remember much of a difference ...but that was just me mind.
Thread Starter
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Cruiser
Joined: Aug 2015
Posts: 113
Likes: 4
From: Dartmouth, Devon, UK
Well, my take would be, that there would be less freedom as one muffler was out of the equation, so less free flow and hence 3dB tops. However if both pipes were all but open anyway, the the added restriction would be even less and the difference probably not noticeable ?
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Tourer
Joined: Jan 2012
Posts: 373
Likes: 90
From: australia
These pics of the Active Exhaust Valve may be of interest to you... Showing flapper open and shut.. The reason I have pictures of the AEV, is the weld on the header pipe cracked where the AEV connected ,, so I decided to remove the AEV altogether, and replace with pipe to suit header pipe length... While I had the header pipe removed, it was also an excuse to remove the cat in the header pipe, (on 2009 flht Electra Glide)... End result,, no Active Exhaust Valve,, no cat ,, = (In my opinion),, better sounding exhaust, and cooler bike...
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