The kit motor is has 20 turns of a single wire per armature segment (normally refered to as a 20x1).
Motors with more than a single wire per pole will have a smoother power delivery and are often listed as a double (x2) or tripple (x3) etc.
Motors with fewer turns, yours has 20, will rev higher thus go faster for the same gearing ..... but in reality you will need to change the gearing to suit the motor or else it will get to hot and fail.
I think the limit for your speedo is actually 17 turns approx, although a lower current draw 15 turn may just be ok.
I personally prefer a car to run a slower smoother motor and gear it higher to give the same top end. For example when most people were running winds like a 10x1 I would be running something like a 13x3 but geared so the top end was very similar. It is much easier to drive a smooth motor and for me me fun!
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