fuel question
Ultimate HDF Member
Joined: Jan 2009
Posts: 5,016
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From: East Tn Foot of The Dragon
If you are referring to the XIED's, they are not a tuner, they are a fuel enrichment device. Google XIED and got to nightrider web site for a complete explanation, Cost about $100 and you can install them yourself
Banned
Joined: Jan 2013
Posts: 501
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From: Kentucky
Correct. You can swap an AC all you wish to do. Mufflers and pipes are a totally different animal. The stock exhaust is what we have found holds things in check, not the AC. AC will only flow as much as the exhaust will allow.
Swap into different exhaust, you will, indeed, need to do something.
Swap into different exhaust, you will, indeed, need to do something.
Road Warrior
Joined: Dec 2012
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From: CT
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Banned
Joined: Jan 2013
Posts: 501
Likes: 252
From: Kentucky
Total flow is controlled by the intake thru to the exhaust. If the exhaust system restricts flow you can let all the air in you want with little effect. Open both ends and now you have a pump with more flow capability. Put your hand over your mouth and blow. Now open your fingers a little, then a lot. Flow changed because you put less restriction on the output.
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Elite HDF Member
Joined: Jun 2007
Posts: 3,873
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From: NW Arkansas
Total flow is controlled by the intake thru to the exhaust. If the exhaust system restricts flow you can let all the air in you want with little effect. Open both ends and now you have a pump with more flow capability. Put your hand over your mouth and blow. Now open your fingers a little, then a lot. Flow changed because you put less restriction on the output.
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Road Warrior
Joined: Dec 2012
Posts: 1,335
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From: CT
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Grand HDF Member
Joined: Jan 2012
Posts: 4,459
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From: Oklahoma
Closed loop fuel injection is capable of making real time adjustments based on exhaust gas composition sensed by the O2 sensors. Standard carburetors (not electrically adjusted) cannot adjust for altitude, temperature, humidity which all effect air density/mixture. It is my THEORY that the ECM can adjust fuel flow to adapt to changes in total flow up to the per-programmed adjustment limit. When that limit is exceeded it trips the engine light, most likely in this case with a "too lean" code. The ECM will increase injector dwell to maintain the factory air fuel ratio until the "that's not right" limit is reached. IF the factory tune is OK for a particular owner, why can't the air cleaner and mufflers be changed without a re-tune UNTIL the check engine light comes on. Now it really is too lean, but until that happens, the factory A/F ratio can be maintained.
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Joined: Jan 2013
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From: Kentucky
I'm not above simple explanations. I'm above giving them out on topics I know nothing about. Not everyone feels the same. There are posts in this thread that demonstrate that very well.
Road Warrior
Joined: Dec 2012
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From: CT
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