07 EFI
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6th Gear
Joined: Sep 2007
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07 EFI
I have been a tech for Ford for 21 years. Seems to me the 07 EFI should work with mods with out any mods to the EFI. Being that it has hego sensors and is feed back. It should adjust by itself. Any thoughts?
Outstanding HDF Member
Joined: Apr 2006
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RE: 07 EFI
Narrow band o2 sensors..... and it is not closed loop all the time, it will switch out to open loop...
Only adjust a small amount.... Enought to accomodate a slip on muffler change but that is about it....
If you change the AC or entire exhaust system, you will need to install an ECM flash or EFI management system...
Only adjust a small amount.... Enought to accomodate a slip on muffler change but that is about it....
If you change the AC or entire exhaust system, you will need to install an ECM flash or EFI management system...
Tourer
Joined: Jun 2007
Posts: 444
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RE: 07 EFI
thats what i would think, even though its is lean 14.1 to 1 i would assume that it should keep the AFR at that area no matter what exhaust you put on the bike, i do understand that mixture is very lean and is causeing the engine to run hot
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,609
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From: Indy area
RE: 07 EFI
The way I understand it is that so long as the error while in closed-loop is within range, the ECU will reel it in to the 14.5 or so it's shooting for. The error factor is maintained/updated on a continual basis and is applied to the entire operational range, even in open-loop mode (where, obviously, it won't be modified). This usually would be to account for environmental changes, fuel oxygen content, component wear, etc.
If the cause of the error is uniform across the operational range everything will work okay. Something like a different intake configuration will not be uniform across the operational range so cannot be safely accommodated by the system.
Muffler changes can be non-uniform too, but by and large the non-uniformity isn't so significant as it is with intake changes.
The sensors are not heated (hego), they are "simply" ego (two wires).
If the cause of the error is uniform across the operational range everything will work okay. Something like a different intake configuration will not be uniform across the operational range so cannot be safely accommodated by the system.
Muffler changes can be non-uniform too, but by and large the non-uniformity isn't so significant as it is with intake changes.
The sensors are not heated (hego), they are "simply" ego (two wires).
Road Master
Joined: Jul 2007
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From: Niagara Falls, NY
RE: 07 EFI
Think of the HD system as a speed density used on early Stangs till 89. When you have MAF and other tuning abilites, then yes it would not matter. O2 on HD is merely to comply with EPA, still a map based ecm.
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Outstanding HDF Member
Joined: Jul 2007
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From: Indy area
RE: 07 EFI
The narrow-band sensors can only (usefully) indicate ±0.5 AFR from stoich. The way the system uses them, however, has a range of up to 30% (±2.2) and it can get results back to within reporting range of the sensors again.
I have yet to get hold of good documentation for the system, nor do I have a SERT and gas analyzers to determine everything without the documentation. I'm merely going on (fairly vague but) good authority for the 30% range. I don't know if it's ±30% (doubtful) or ±15% (likely, and the factor used for my "2.2" above). Even with the smaller of the two possibilities, the system is very adept.
Once again, if the error is uniform across the operating range of engine-speed/throttle-setting combinations, the effective (calculated) volumetric efficiency values everywhere will be appropriate. If the error is non-uniform across those combinations it will not work.
Short of either wide-band sensors in use full-range or mass air flow capabilities, this system is quite good; it's no toy.
I have yet to get hold of good documentation for the system, nor do I have a SERT and gas analyzers to determine everything without the documentation. I'm merely going on (fairly vague but) good authority for the 30% range. I don't know if it's ±30% (doubtful) or ±15% (likely, and the factor used for my "2.2" above). Even with the smaller of the two possibilities, the system is very adept.
Once again, if the error is uniform across the operating range of engine-speed/throttle-setting combinations, the effective (calculated) volumetric efficiency values everywhere will be appropriate. If the error is non-uniform across those combinations it will not work.
Short of either wide-band sensors in use full-range or mass air flow capabilities, this system is quite good; it's no toy.
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RE: 07 EFI
I think part of the problem, unlike Ford, GM, and all the Jap bikes, and other car makers, is that the MOCO, basically has two motors, sporty, and the twin cam to pass epa regs with, unlike everyone else who have about 15 each to level out their fleet to average under the EPA regs. I dont know this, just thinking out loud, that is one reason they come from the factory so damn lean running.