lean running concerns
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Intermediate
Joined: Aug 2006
Posts: 29
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lean running concerns
Hi,
I just bought a K&N high flow HD-1499 air filter which is a stock replacement. Will I need to reprogram the ECM or is it not necessary ? My thinking is the stock air box is what restricts the airflow on the intake side. Everything is stock on the bike. Thanks for your input. Judd
I just bought a K&N high flow HD-1499 air filter which is a stock replacement. Will I need to reprogram the ECM or is it not necessary ? My thinking is the stock air box is what restricts the airflow on the intake side. Everything is stock on the bike. Thanks for your input. Judd
Elite HDF Member
Joined: Sep 2007
Posts: 4,928
Likes: 69
From: Near Myrtle Beach, SC
RE: lean running concerns
Unless you change your exaust system to compliment the free flow that your new air box provides, you will not see much if any difference in performance or air/fuel ratio.
Think of it this way....imagine a run of 2 inch water pipes. All the sudden, you change the first pipe to 4 inches, but the rest remains 2 inches. Even though the first section of pipe is larger, you will still be restricted by the 2 inch pipe sections and get no more water than before out the other end of the pipe. (assuming pressures are the same).
When you do move away from the stock exaust to one allowing more air flow, and that could be the Screamin Eagle slip-on mufflers, or a move to a true dual header system with those or other mufflers, then you will be in a situation where you will need to ensure that you are not running to lean. All your piping, so to speak, will now be of the 4 inch variety (example above).
The two most popular options (and there are many) for tuning hardware are the Power Commander III and the SERT (Screamin Eagle Race Tuner). You can search for and find a lot of information on both on this forum. But a Dyno run utilizing an oxygen sensor during the runs is a verified way of dialing-in the tuning of either the PCIII or the Sert. Engine purists seem to gravitate toward the SERT, while folks that want to tune it and forget it and ride it, use the PCIII. Here locally, I have found more tuners specializing in the PCIII. But it sounds like you are interested in making your bike run it's best, so good luck and have fun. My Road King has an older PCII, while my 04 ultra utilized the SERT for tuning.
Regards
Think of it this way....imagine a run of 2 inch water pipes. All the sudden, you change the first pipe to 4 inches, but the rest remains 2 inches. Even though the first section of pipe is larger, you will still be restricted by the 2 inch pipe sections and get no more water than before out the other end of the pipe. (assuming pressures are the same).
When you do move away from the stock exaust to one allowing more air flow, and that could be the Screamin Eagle slip-on mufflers, or a move to a true dual header system with those or other mufflers, then you will be in a situation where you will need to ensure that you are not running to lean. All your piping, so to speak, will now be of the 4 inch variety (example above).
The two most popular options (and there are many) for tuning hardware are the Power Commander III and the SERT (Screamin Eagle Race Tuner). You can search for and find a lot of information on both on this forum. But a Dyno run utilizing an oxygen sensor during the runs is a verified way of dialing-in the tuning of either the PCIII or the Sert. Engine purists seem to gravitate toward the SERT, while folks that want to tune it and forget it and ride it, use the PCIII. Here locally, I have found more tuners specializing in the PCIII. But it sounds like you are interested in making your bike run it's best, so good luck and have fun. My Road King has an older PCII, while my 04 ultra utilized the SERT for tuning.
Regards
Ultimate HDF Member
Joined: Aug 2007
Posts: 9,486
Likes: 4
From: Hico, TX (once home to Billy the Kid)
RE: lean running concerns
Im having a problem with this.
Why does the Motor have an O2 sensor?
These high operating temperatures can be mostly attributed to the new closed loop operating mode of the EFI system. The OEM closed loop operating mode relies on narrow band oxygen sensors to keep the air fuel ratio at 14.7:1.
Does the EFI closed loop system not read the exhaust and keep it at 14.7:1?
Everytime I read these posts I have to question what is being said.
It's either a closed loop system or it's not.
If it is, whats the problem with what you put on the bike? It will keep it at the air fuel ratio of14.7:1.
Yes or no?
Enquiring minds want to know.
Why does the Motor have an O2 sensor?
These high operating temperatures can be mostly attributed to the new closed loop operating mode of the EFI system. The OEM closed loop operating mode relies on narrow band oxygen sensors to keep the air fuel ratio at 14.7:1.
Does the EFI closed loop system not read the exhaust and keep it at 14.7:1?
Everytime I read these posts I have to question what is being said.
It's either a closed loop system or it's not.
If it is, whats the problem with what you put on the bike? It will keep it at the air fuel ratio of14.7:1.
Yes or no?
Enquiring minds want to know.
Road Captain
Joined: Sep 2007
Posts: 602
Likes: 0
From: Long Beach,Wa.
RE: lean running concerns
Here's some interesting reading and sounds like an option to the fuel managment if you
don't plan on to many mods.....
https://www.hdforums.com/m_2836828/tm.htm
don't plan on to many mods.....
https://www.hdforums.com/m_2836828/tm.htm
Ultimate HDF Member
Joined: Aug 2007
Posts: 9,486
Likes: 4
From: Hico, TX (once home to Billy the Kid)
RE: lean running concerns
ORIGINAL: rsofa
Here's some interesting reading and sounds like an option to the fule managment if you
don't plan on to many mods.....
https://www.hdforums.com/m_2836828/tm.htm
Here's some interesting reading and sounds like an option to the fule managment if you
don't plan on to many mods.....
https://www.hdforums.com/m_2836828/tm.htm
Tourer
Joined: Aug 2006
Posts: 370
Likes: 1
From:
RE: lean running concerns
Rocknrod,
Let us know what you think of the Niterider's IEDS. Been thinking seriously about those myself.
For now, I'm happy withthe stock setup on my 08 RG, just want to cool the engine some by enrichening the fuel mix.
If anyone else is using these, give us a report.
Thanks
Let us know what you think of the Niterider's IEDS. Been thinking seriously about those myself.
For now, I'm happy withthe stock setup on my 08 RG, just want to cool the engine some by enrichening the fuel mix.
If anyone else is using these, give us a report.
Thanks
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Seasoned HDF Member
Joined: Dec 2007
Posts: 8,341
Likes: 713
RE: lean running concerns
the stock 07 runs too lean = hot, add more air and not more fuel= way to lean and hot.
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Road Master
Joined: Jan 2008
Posts: 1,048
Likes: 1
From: Canada
RE: lean running concerns
ORIGINAL: blueride
Rocknrod,
Let us know what you think of the Niterider's IEDS. Been thinking seriously about those myself.
For now, I'm happy withthe stock setup on my 08 RG, just want to cool the engine some by enrichening the fuel mix.
If anyone else is using these, give us a report.
Thanks
Rocknrod,
Let us know what you think of the Niterider's IEDS. Been thinking seriously about those myself.
For now, I'm happy withthe stock setup on my 08 RG, just want to cool the engine some by enrichening the fuel mix.
If anyone else is using these, give us a report.
Thanks
Yup...Read the thread....There have been some real world tests done by the members using an inferred Thermometer. Everything positive....nothing negative yet..
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