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Active Exhaust Module

Dyna Models

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Old Sep 24th, 2010, 11:47 AM     #1
Warming The Wheels
Ride: 2009 Fat Bob
 
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Active Exhaust Module

I bought the Service manual for my 2009 Fat Bob. In the section on exhaust it explains and shows pictures of the active exhaust module. It is an electric servo that contols a wire that opens and closes a damper that is built into the exhauset collector. Well, my bike does not have the servo, wire or damper illustrated??
Any thoughts?
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Old Sep 24th, 2010, 11:59 AM     #2
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Re: Active Exhaust Module

I went through the same thing with my 07, after research I found out it is a system used in Europe. It is not on US bikes.
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Old Sep 24th, 2010, 12:06 PM     #3
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Re: Active Exhaust Module

I've heard about these on cars. Suppose to help low end torque with back pressure. I wonder if it has the same effect on the bike? Why in europe and not US. Unless it is a sound dampening system?
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Old Sep 24th, 2010, 12:19 PM     #4
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Re: Active Exhaust Module

Quote: Originally Posted by DynaBob09 View Post
Unless it is a sound dampening system?
I think that is what it is. Has nothing to do with power.
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Old Sep 24th, 2010, 12:20 PM     #5
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Re: Active Exhaust Module

I found this that explains what it does. We are not missing anything.
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Old Sep 24th, 2010, 02:04 PM     #6
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Re: Active Exhaust Module

Quote: Originally Posted by DynaBob09 View Post
I found this that explains what it does. We are not missing anything.
Forgot the link....

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Old Sep 25th, 2010, 12:31 AM     #7
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Re: Active Exhaust Module

That's a feature on International market Harleys only.
These bikes have what can be described as 'active' or opening Butterfly valves in the Air intake AND Exhaust systems.

Basically,the valve opens at a certain rpm to increase intake/exhaust flow;and closes at about the rpm point that exhaust decibel measurements are taken.With the Exhaust valve in the closed position,the bike basically has a very restrictive 2into1 system.It closes off flow to the front cylinder muffler just AFT of the balance pipe.

Seems to be a bit of a gimmick;if one fits an aftermarket A/C,the intake valve becomes superfluous;and so will the exhaust butterfly if one fits a Thundermax.Then it defaults to permanently open.
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Old Sep 25th, 2010, 02:52 PM     #8
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Re: Active Exhaust Module

Kinda reminds me of ol' school testing tricks for meeting sound and emissions test ONLY at the points being tested and let the rest of the law be...uhumm..."COMPLIANT."
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