True Duals Installed...SWEET!
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Cruiser
Joined: Oct 2008
Posts: 111
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From: Perry Hall, MD
True Duals Installed...SWEET!
Got V&H True Dual headpipes installed on my '08 FLHTC. Stuck with the stock HD mufflers...for now. Gotta say, it sounds pretty sweet. 
I noticed it runs just fine...no change done to ECM. My local dealer had warned me there would be some sputtering, mis-firing, etc without a new download. Bad info?
I noticed it runs just fine...no change done to ECM. My local dealer had warned me there would be some sputtering, mis-firing, etc without a new download. Bad info?
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Cruiser
Joined: Oct 2008
Posts: 111
Likes: 0
From: Perry Hall, MD
No, this change was to remove some un-wanted heat. We shall see if it does the trick.
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,609
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From: Indy area
You're not going to get a good idea of just what the difference(s) will be until you both get a set of mufflers which is actually a complete set and until you address the tuning issues you just created. The left-side "muffler" isn't really a muffler and its flow characteristics have got to be completely different from the right-side, which is a conventional muffler. The left-side is more like a resonating chamber with a vent. I'd place money that it flows far better at idle than it does at 5000 rpm compared to the right-side unit. The (other) tuning issue is that the relationships between the two cylinders has changed compared to what the EFI controller thinks is there and is indeed still (trying to be?) tuning to, even if you were using an actual pair of mufflers.
Stellar HDF Member
Joined: Feb 2008
Posts: 2,156
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From: Pittsburgh, PA
Wow, not a good thing to do at all. Look at your mufflers, the left is different from the right, it it restricted mostly to force gases out the other pipe, now where is it going to go? I would think running it with true duals but stock mufflers is bad, very bad.
Last edited by ezriderpgh; Jan 1, 2009 at 09:12 PM.
Road Master
Joined: Apr 2008
Posts: 1,230
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From: Oak Park, IL
I totally agree on the mufflers, you are not doing your motor any good with a mismatched set, try to find at least a set of SE or CVO mufflers. My bike ran ok with the FullSac TD conversion, ran better after a dyno tune, will run even better once I can do some data logging and fine tune the map to the way I drive.
I do love the sound of TDs and your right leg is going to thank you this summer!
I do love the sound of TDs and your right leg is going to thank you this summer!
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Outstanding HDF Member
Joined: Jul 2007
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From: Indy area
Just in case I wasn't clear-enough earlier, even if/when you get a matched pair of mufflers, you'll need to address the fueling requirement changes of the different type of exhaust system. See the comparative VE tables from the two types of systems using the last version of the SERT software and base maps in http://i33.tinypic.com/1zps6lu.png
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Thread Starter
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Cruiser
Joined: Oct 2008
Posts: 111
Likes: 0
From: Perry Hall, MD
Thanks for the info. I did not realize the stock mufflers were different on each side...but I can understand why.
I have the SEST for making adjustments. Any suggestions on where to start?
I have the SEST for making adjustments. Any suggestions on where to start?
