| Author | Message | ||
     Mmcn49 |
Found this simple schematic for a homemade device to change an NB o2 sensor's Stoi. AFR from 14.7:1 to 14.2:1. The schematic and assembly instructions can be viewed at: http://www.nightrider.com/biketech/hd2007HD_nbo2_v olt_divide.htm Unfortunately the device is for use on two wire HD o2 sensors. 1. Does anyone know if this simple device really works? 2. Can the device be modified for use on a single wire o2 sensor? 3. If not, are the two wire HD o2 sensor's thread size and tip depth the same as the Buell's single wire sensor? If a two wire sensor will fit, the wiring changes are fairly simple. | ||
| Typeone |
interesting. along these lines, i'd be curious to know if by adjusting the mid and lean voltage settings for the 02 using ECMSpy you're essentially doing the same thing (?) | ||
| Jerseyguy |
Typeone, I was wondering the same thing. Kevin told me that it can be made to work. I'm just a bit cautions as I don't know what to change the settings to. I think I'd like the A/F to be about 13.5 across the board. | ||
| Mmcn49 |
along these lines, i'd be curious to know if by adjusting the mid and lean voltage settings for the 02 using ECMSpy you're essentially doing the same thing (?) Wondered that as well. I've raised the mid voltage to .54 and have raised the lean voltage, but I just don't know if what if anything this does. | ||
| Typeone |
according to Mikes (xopti) tests, the stock 0.49 volt 02 sensor mid value gives closed loop a 14.9:1 ratio, raising mid voltage to 0.52 changes the ratio to 14.65:1. i'm currently running the mid value at 0.50 and the lean value at 0.42 based on comments i've read like the above. | ||
| Typeone |
Wondered that as well. I've raised the mid voltage to .54 and have raised the lean voltage, but I just don't know if what if anything this does. did you see your AFV change during testing of those settings? | ||
| Mmcn49 |
I raised the o2 mid point voltage just prior to a data log run. For the run I set AFV min & max to 100%. After the run I entered the new fuel cell values and reset the AFV range to 60-150%. Went for two rides after making these changes, one short and one 470 mile run. The AFV dropped to 89% and 90%, (I reset AFV to 100% between runs). Next I removed the battery cables to erase any fuel cell value changes, reset AFV to 100% and min and max AFV to 100% The bike runs very good even up to 5240 feet with the new data log maps and AFV restricted to 100%. If the circuit works, I'm real curious to see how my bike will run with stock maps and the normal AFV range. What we need is for an EE to take a look at the circuit and see if it can be made to work with our single wire sensor. I agree 14.2 is not perfect, but its a lot better than 14.7. | ||
| Typeone |
i think i read if you make the voltage change you need to make similar changes in MLV or you end up chasing your tail. cant remember specifics though so dont quote me on that. i have recently given up on MLV generated output with the NB 02. always went fat on me no matter what i tried, then the bike would lean things out again. i dont want to disable any of the learning features so this isnt acceptable to me until i go dual WB. instead, making the simple tweaks to the 02 voltage, bumping the stock 07 fuel maps by 102% F+R, stock 07 timing and some minor cell work in the idle and decel regions have made my 12 run better than it ever has. few other tweaks in there as well but my AFV has stayed rock solid at 100 in similar ambient conditions and i havent experienced ping once. the race maps introduce this every time i try them. not to mention, the race map is generally leaner in the areas i like to punch it, down low. i'll probably do more logging but only to watch whats going on with AFV and EGO, then make small refinements from there. little off topic but thats some of my recent findings for my bike. | ||
| Xl_cheese |
As stated above,  I adjust my mid point up from 49 to 50 and the lean number from 41 to 42 and I'll see my AFV go up from 100 to ~105. I'd make this the last change to the map after dataloggin. MLV has it's own model of how the narrowband works so this will cause you to chase your tail. | ||
| Mmcn49 |
Thanks for your input Typeone. XL-When AFV went to 105% I wonder if the entire closed loop region was enriched by 5%, or just a few cells? | ||
| Typeone |
no sweat. just to help with the other question, if AFV rises to 105%, the entire map is boosted by 105% everywhere. | ||
| Mmcn49 |
Verbiage with the schematic states: The voltage divider works by taking advantage of the accurate range of the o2 sensor and some simple electronics to allow the 0.75v output from the o2 sensor to look like 0.50v. Wonder what would happen if the o2 mid point was set at 0.75? | ||
| Mmcn49 |
}just to help with the other question, if AFV rises to 105%, the entire map is boosted by 105% everywhere. Is everywhere both the Front and Rear Fuel Maps? | ||
| Typeone |
yes, front and rear are scaled | ||
| Xl_cheese |
XL-When AFV went to 105% I wonder if the entire closed loop region was enriched by 5%, or just a few cells? In CL the bike runs off the ego corr. number rather than the AFV. AFV is applied to open loop areas. If you want to prove it to yourself do this experiement. In Open loop idle - Set AFV to 100 and record the RPM. Then set AFV to 105 and Record. Same for 110. You can set AFV while the bike is running. then when the bike warms up and CL idle kicks in watch the ego corr number on the ECM runtime tab and take note of the RPM. Once in CL you can change the AFV around and nothing will happen. Shut the bike off and change the O2 sensor numbers to the higher values and repeat above steps. You'll notice that ego corr will immediately be higher and when driven the AFV will adjust to a higher value too. | ||
| Typeone |
very cool stuff, Xl. thanks for that info! | ||
| Mmcn49 |
XL, Do you know if the ego corr number changes by the same %age as AFV. CL is where these changes really need to happen. | ||
| Xl_cheese |
ego corr. is real time. If you watch it either on ECMSPY or a datalog you'll see it zigzag Look at a datalog and plot the O2 with ego corr. and you'll see how it works. The AFV is a very slow change. You might see an adjustment in 5-10 minutes of CL riding. | ||
| Swordsman |
Dumbest question ever: what does EGO stand for?  ~SM | ||
| Id073897 |
Exhaust Gas Oxygen |
