Quote:
Originally Posted by Gone Dave
This is my first time to build a car with my son, and I am looking for some rocket science here..
My question is this, after construction I need to add some ounces, does it make a speed change if I put it in the front, center mass, or rear?? 
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I always put it low and near the center to try and keep the weight on all 4 wheels equal.
Make sure you polish them axles and sand them wheels so the contact surface is kept to a minimum as well.