how-to: control closed loop AFR with your wideband O2 system
I'm getting way too impatient. I may just wire my lc-1's narrowband sim to the front o2 for now until this comes out for V7.
Isn't 14.7 idle/cruise a little tooooo rich for e85? I know 14.7 on 93 is mainly for emissions and all and I'd like to lean it out for better mpg, but wouldn't the engine run better overall if it were leaner?
Isn't 14.7 idle/cruise a little tooooo rich for e85? I know 14.7 on 93 is mainly for emissions and all and I'd like to lean it out for better mpg, but wouldn't the engine run better overall if it were leaner?
Pump gas runs better at 15.5 if you can control it tightly, though the cat won't be as hot.
E85 can run 16:1 (gasoline scale) no problem and some people run as lean as 17:1.
I'm mainly looking for what I have to do so it can work on v7...
So I would imagine that If I just used my wbo2 to simulate the front nbo2 at lets say 16.0, then I'd imagine it would wreak havoc on my trims? Or could I just mess with the fuel map?
Sorry if its this semi-off topic cause its not dealing exactly with mrfred's patch.
Sorry if its this semi-off topic cause its not dealing exactly with mrfred's patch.
Datalog both the USB WB readings and also datalog the analog input (purple wire) with an eval of "x" so we can compare the AFR readings to the bit values. Then we can dial it in.
Travman, you are correct that 0v= 9.6AFR and 5v=19.6AFR. With the ADC inout though, a bit value of 0=9.6AFR and 255=19.6AFR
EDIT:try this....
eval= (((5/255)*x)*2)+9.6
Its basically the same formula as the x/255*10+9.6 formula but written so you can see all of the work. You may need to fudge the values a bit to comprensate for voltage losses in the wiring and connections.
Travman, you are correct that 0v= 9.6AFR and 5v=19.6AFR. With the ADC inout though, a bit value of 0=9.6AFR and 255=19.6AFR
EDIT:try this....
eval= (((5/255)*x)*2)+9.6
Its basically the same formula as the x/255*10+9.6 formula but written so you can see all of the work. You may need to fudge the values a bit to comprensate for voltage losses in the wiring and connections.
I tested both formulas and (x/255*10+9.6) seems to scale perfectly through the range, and it matches bang on, so I guess with a proper ground or non faulty zt2 the purple wire really is linear, with the other formula it's off by .2
Yes, your trims will adjust to try to represent 16.0 as 1 lambda. If not, why would we even be talking about it?
So my steps for implementing WB control would be this:
1. Wire analog WB signal to ECU pin x
2. I don not need to do rear sim patch becuase I'm running V7
3. Apply the patch in pg1 of this thread and copy all values from DL hex file to the new tables
using Fosty's calcs for the AEM.
Is there anything else that I'm missing and/or my steps wrong. Any info would be appreciated.
Matt
1. Wire analog WB signal to ECU pin x
2. I don not need to do rear sim patch becuase I'm running V7
3. Apply the patch in pg1 of this thread and copy all values from DL hex file to the new tables
using Fosty's calcs for the AEM.
Is there anything else that I'm missing and/or my steps wrong. Any info would be appreciated.
Matt
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So my steps for implementing WB control would be this:
1. Wire analog WB signal to ECU pin x
2. I don not need to do rear sim patch becuase I'm running V7
3. Apply the patch in pg1 of this thread and copy all values from DL hex file to the new tables
using Fosty's calcs for the AEM.
Is there anything else that I'm missing and/or my steps wrong. Any info would be appreciated.
Matt
1. Wire analog WB signal to ECU pin x
2. I don not need to do rear sim patch becuase I'm running V7
3. Apply the patch in pg1 of this thread and copy all values from DL hex file to the new tables
using Fosty's calcs for the AEM.
Is there anything else that I'm missing and/or my steps wrong. Any info would be appreciated.
Matt
Stock Rom:
V7 Rom
Last edited by travman; Feb 2, 2010 at 11:54 AM.
I am just showing the stock rom and V7 rom without the patch applied - doesn't seem V7 uses any space that the patch uses so it works fine.
Sorry for the confusion
Ok, thanks....there are two rear O2 inputs for the ECU. Do I use the one for the heater input or the signal input? I'm assuming signal, which is pin 73.
I don't need to apply the rear o2 algorithm either since I'm using V7, correct? Just this patch?
I don't need to apply the rear o2 algorithm either since I'm using V7, correct? Just this patch?
Last edited by lan_evo_mr9; Feb 3, 2010 at 12:01 PM.