If you modify with /data an NBT Motion path of a minecart on the rail to a big value, it still runs with the speed 2m/s, not as fast as the NBT Motion path. And of course the Motion is auto changed to 2. Therefore, I can't make a minecart faster than 2.
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I would like to mention that the maximum allowed 'Motion[]' value for minecarts seems to be 2 instead of 8. I've attached a structure file for others to test this:
[media]Here is my personal test. Notice how the speed I've set is 3.0d:
[media]Note: Even with /data merge it still seems to have the upper limit of 2:
/data merge entity @e[type=minecart,limit=1] {Motion:[0.0,0.0,8.0]}
Minecarts have a predefined speed limit of 8 m/s per axis (assuming the wiki is correct.)