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toc 03-04-2012 05:36 AM

MAF Reading
Hi All,

I'm modifying OBDuino to utilise a protocol from Nissan (Consult II).

In doing so, I've found that the g/s MAF reading is not available - I get a V reading instead.

Any thoughts if I can use the V reading someway (i.e. scale the reading to equal a g/s rate)?

Or if not, I can get injector pulse rate - how would that fit in a calculation? Injector duty would show how long each is open for, knowing the flow rate of the injectors - wouldn't it be possible to know how much fuel is going in? Would that be less accurate than the MAF method?

I don't have MAP accessible as a parameter either - the MAF sensor is there - but doesn't appear to be via the data reading.

toc 03-06-2012 04:18 AM

Any takers?

orangustang 04-13-2012 09:46 PM

The OBDI version of MPGuino uses the injector pulse and VSS signal to calculate mileage (vss/pulse*k where k is a constant determined by the number of cylinders, injector flow rate, etc.) I would think using the injector pulse would be more accurate than MAF/MAP since it's a more direct measure of fuel usage.

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