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I have recently recieved a CAN OBDuino which can log directly to an SD card.
I'm currently logging all my trips gathering the following data, each PID being sampled 3-4 times every second:
Time since engine start
Mass air flow
RPM
VSS
Intake air temp
Coolant temp
Equivalence ratio
Calculated load value
Calculated load value = airflow / peak theorical airflow. Mapping this against the maximum torque curve of the engine I should be able to compute an estimation of the actual torque the engine is producing without having to consider a whole lot of variables.
So I should be able to produce a bsfc map of unknown accuracy this way, but it would still be interesting to see. What I'm really curious to see are the differences between the two bsfc maps I could produce this way. One with a low IAT range and one with a high IAT range.
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