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2. The map itself, does the amount of data equal how accurate the map can be?
For example, if a Map has a Load table that has X number of references, does another Ecu with with twice as many mean the map can be any better???
Or is it that another Ecu which has more Parameters in total provide a better map?
Yes, generally speaking the more load and rpm sites available, the smoother and more accurately the engine can be mapped.
although most use interpolation to get the values between sites. for example if you have a 2000 rpm and 0.9 bar, but your map only has values at 2000 rpm and 0.8 and 1 bar, then it will take the middle point between the 2.
so often it's not the map size that is so important as many conditions can be well handled by interpolated points. what is good is to have the option of redefining the load or speed values so that if you have a non linera area of the map you can have several sites close together, but then get away with using less over another area of the map where it is linear.