how-to: Log AFR from the LC-1 w/o a serial cable
Dec 28, 2008, 11:00 AM
#136
I'm trying to work in an Uego to be used with this but, I'm having a little difficulty figuring out the Eval formula. Per the documents that come with the Uego under the calibration portion it notes some Cal Table info that is to be inputed into a EMS. The table shows O2 volts/Lamba/Gasoline AFR/various other fuels.
It shows at 0 O2 volts the Gasoline AFR is 10.00 and than at 4.99 O2 volts the Gasoline AFR is 19.98.
It would appear than that the formula for the Uego should be :
(19.98-10.0)/255*x + 9.0 = 0.03914*x + 9.0
Does that look right??
It shows at 0 O2 volts the Gasoline AFR is 10.00 and than at 4.99 O2 volts the Gasoline AFR is 19.98.
It would appear than that the formula for the Uego should be :
(19.98-10.0)/255*x + 9.0 = 0.03914*x + 9.0
Does that look right??
(19.98-10.0)/255*x + 10.0 = 0.03914*x + 10.0
Dec 29, 2008, 12:32 AM
#144
I think I have it right, not sure exactly what/where you mean?? I used the values 10 and 19.98 in the formula to determine the correct Eval formula but, where else would it be used?
I did notice from looking over the EVOScan .xml file that the "External Wideband A/F Ratio" line differs from the new entry I added for this patch to read the wideband hardwired through the rear O2 sensor ADC.
The last bit of the entry for the "External Wideband A/F Ratio" line reads:
GAUGEMAX="60" ChartMin="0" ChartMax="60" ScalingFactor="10"
The entry for the hardwired wideband entry reads:
GaugeMax="22" ChartMin="0" ChartMax="22" ScalingFactor="1"
That is the only difference I see. Could this be the issue in difference between what the Uego gauge is showing versus what is showing in EVOScan from the Uego O2 sensor?
I did notice from looking over the EVOScan .xml file that the "External Wideband A/F Ratio" line differs from the new entry I added for this patch to read the wideband hardwired through the rear O2 sensor ADC.
The last bit of the entry for the "External Wideband A/F Ratio" line reads:
GAUGEMAX="60" ChartMin="0" ChartMax="60" ScalingFactor="10"
The entry for the hardwired wideband entry reads:
GaugeMax="22" ChartMin="0" ChartMax="22" ScalingFactor="1"
That is the only difference I see. Could this be the issue in difference between what the Uego gauge is showing versus what is showing in EVOScan from the Uego O2 sensor?
Dec 29, 2008, 01:02 AM
#145
I'm trying to work in an Uego to be used with this but, I'm having a little difficulty figuring out the Eval formula. Per the documents that come with the Uego under the calibration portion it notes some Cal Table info that is to be inputed into a EMS. The table shows O2 volts/Lamba/Gasoline AFR/various other fuels.
It shows at 0 O2 volts the Gasoline AFR is 10.00 and than at 4.99 O2 volts the Gasoline AFR is 19.98.
It would appear than that the formula for the Uego should be :
(19.98-10.0)/255*x + 9.0 = 0.03914*x + 9.0
Does that look right??
It shows at 0 O2 volts the Gasoline AFR is 10.00 and than at 4.99 O2 volts the Gasoline AFR is 19.98.
It would appear than that the formula for the Uego should be :
(19.98-10.0)/255*x + 9.0 = 0.03914*x + 9.0
Does that look right??
https://www.evolutionm.net/forums/6384799-post94.html
(the have the values and formula built in for the UEGO)
You may want to adjust your values slightly if you can log both serial and analog.
Jan 4, 2009, 03:46 AM
#147
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Hello Mrfred
instead of using the pin of the rear O2, is it possible to use the pin 64 in the Evo IX?
Pin 64 is declared as ADC input 0-5V with 5V=255, and it seems unused in the code.
How would your patch be changed for that?
Thanks
mlocatel
instead of using the pin of the rear O2, is it possible to use the pin 64 in the Evo IX?
Pin 64 is declared as ADC input 0-5V with 5V=255, and it seems unused in the code.
How would your patch be changed for that?
Thanks
mlocatel
Jan 4, 2009, 04:51 AM
#149
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Basically nothing, but I'm not sure it is free in my version 88840017.
If we could use the ADC which is not occupied it is safer.
I'm not 100% sure that my EVO doesn't have a rear O2 though
If we could use the ADC which is not occupied it is safer.
I'm not 100% sure that my EVO doesn't have a rear O2 though
Jan 4, 2009, 08:33 AM
#150
Its not hard to figure out whether pin 73 is used for anything. Best way would be to have a look in the factory service manual for your car. Second best is to pull the ECU plugs and look to see whether a wire runs into the connector hole for that pin.