The weight of the car is irrelevant. Scale weight to power even with the "weaker" motor will still be alot more than a bugati veyron. The purpose of the weight is to make the car more stable in the bends.
My zx5 4WD weighs 1887g and has a x11 5.5 that is too fast indoors. For racing put the slower motor in and leave it there until it dies. For bashing put in whatever you want.
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