Fuel trim scaling
The value send via OBD_PID_0E = 2*MUT_06 + 88
OBD_PID_0E is scaled x/2-64
Timing_Advance in range +-64 is then
Timing_Advance = (OBD_PID_0E)/2-64
with substitution
Timing_Advance = (2*MUT_06 + 88)/2-64
then
Timing_Advance = MUT_06 + 44 - 64
so
Timing_Advance = MUT_06 - 20
is correct
OBD_PID_0E is scaled x/2-64
Timing_Advance in range +-64 is then
Timing_Advance = (OBD_PID_0E)/2-64
with substitution
Timing_Advance = (2*MUT_06 + 88)/2-64
then
Timing_Advance = MUT_06 + 44 - 64
so
Timing_Advance = MUT_06 - 20
is correct
OBD 10 is a mass airflow: OBD request 10 *.01 = g/sec of airflow. I used this to correlate our MUT request of load to a mass airflow and came up with an approximation of load, but I was wondering if you can find this in the ROM and the exact calculations.
Thanks,
Eric
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From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
Unfortunately in my ROM OBD_PID_10 is not supported as my engine speed density is calculated via MAP, I do not have any MAF.
I will try to find the calculation in some other ROM for OBD_PID_10.
In the meantime I have found that OBD_PID_11 is calculated from MUT_8A so the
description for MUT_8A which states Load error is wrong it is Throttle Position as well as MUT_12 is Coolant temperature after it reaches 81degrees Celsius and not EGR. I will try to extract the correct scaling for this one too.
Maybe I should have named the thread EvoScan/Mitsulogger scalings
I will try to find the calculation in some other ROM for OBD_PID_10.
In the meantime I have found that OBD_PID_11 is calculated from MUT_8A so the
description for MUT_8A which states Load error is wrong it is Throttle Position as well as MUT_12 is Coolant temperature after it reaches 81degrees Celsius and not EGR. I will try to extract the correct scaling for this one too.
Maybe I should have named the thread EvoScan/Mitsulogger scalings
A bit off topic, but can you find the correlation of OBD request 10 and a MUT request?
OBD 10 is a mass airflow: OBD request 10 *.01 = g/sec of airflow. I used this to correlate our MUT request of load to a mass airflow and came up with an approximation of load, but I was wondering if you can find this in the ROM and the exact calculations.
Thanks,
Eric
OBD 10 is a mass airflow: OBD request 10 *.01 = g/sec of airflow. I used this to correlate our MUT request of load to a mass airflow and came up with an approximation of load, but I was wondering if you can find this in the ROM and the exact calculations.
Thanks,
Eric
Last edited by acamus; Sep 14, 2008 at 11:00 AM.
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From: Tri-Cities, WA // Portland, OR
Unfortunately in my ROM OBD_PID_10 is not supported as my engine speed density is calculated via MAP, I do not have any MAF.
I will try to find the calculation in some other ROM for OBD_PID_10.
In the meantime I have found that OBD_PID_11 is calculated from MUT_8A so the
description for MUT_8A which states Load error is wrong it is Throttle Position as well as MUT_12 is Coolant temperature after it reaches 81degrees Celsius and not EGR. I will try to extract the correct scaling for this one too.
Maybe I should have named the thread EvoScan/Mitsulogger scalings
I will try to find the calculation in some other ROM for OBD_PID_10.
In the meantime I have found that OBD_PID_11 is calculated from MUT_8A so the
description for MUT_8A which states Load error is wrong it is Throttle Position as well as MUT_12 is Coolant temperature after it reaches 81degrees Celsius and not EGR. I will try to extract the correct scaling for this one too.
Maybe I should have named the thread EvoScan/Mitsulogger scalings
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