The frame has been designed to allow the engine to be mounted. It may need a bit more supporting when it is made but this will have to be looked at after but as a basic design it should be OK. We are using solidworks for our desings but without all of the parts and weights being put into an assembly (as we don't know them all at the moment) how do I find the Center of gravity of the car. How do I know the corner weights? We have some donor shocks that we are going to use for our first car (as we don't have a lot of funding). We have springs on them, if I can find what they are can I design the suspension around this? The front and back shocks are different and need refurbing but this isn't much of a problem, apart from determining what spring rates are need. How do I find out where to mount the coilovers? and does the mounting position change the rate of the springs and how the system will work as I guess it will quiet dramatically.įinding the center of gravity is probably easiest using Excel. List out all major parts of the car (anything that weights over 2-3 lbs maybe), figure out a close x, y, z coordinate, figure out the mass of each part, and it's an easy math/physics problem. To find exact corner weights, you can support the chassis, disconnect the dampers, and place the wheels on scales. This is best done while the suspesion is attached to the car, because only half of the control arms (and anything attached to the chassis) is unsprung, and measuring this way accounts for that. It may actually be better to keep the damper connected, but remove all preload from the spring, and make sure the damper is not at full droop or compression. To give you a start on calculations, ours are between 20-30 lbs, don't remember the exact values though. Just realized you said corner weights, not unsprung. Take your overall weight, multiply by longitudinal weight balance, then multiply by lateral weight balance, and you have one of your corner weights. ![]() ![]() Refer to my first post, and read about suspensions.
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