Right what you need to do is have a set of scales with a wheel on top to allow for droop and then a surface exactly the same height for the opposite side of the car. Start by weighing the overall weight of the car, write that down. Then put the front end of the chassis on the scales and place the rear end on the other surface you've made, make a note of the weight of the front. Do the same again for the rear. You now have readings for overall weight, front, and rear. To get the percentages all you need to do is divide either the front or rear weight by the overall weight of the car. To ensure your readings are accurate though add your individual front and rear weights together to make sure it's within 10g of your first overall weight reading
Oh yea and it's also more accurate if on the scales you have a ruler or something so the car sits on the scales by the width of the car and not just balancing on the centre of the chassis.
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