Center of Gravity for 1995-1996 240sx

[crk06c]

Anyone know the location of the CoG in the zenki? I tried calculating it, but I don't have scales so I had to measure the contact patch, and it's not coming out with reasonable numbers. I also searched this topic, and found no pertinent information. If anyone out there has done this on scales or just has a wealth of info that most of us are lacking, I'd appreciate the help. Thanks.

CK

[Budget240sx]

Easy answer: balance your car on two jack stands(not so reccomended). Longer answer:I hunted around for some specs and assuming that the weight distribution is 55% front(only solid answer I could find), curb weight is 1267Kg, and distance between front and rear wheels is 2.5m(Motortrend). The center of gravity is 1.3 meters from the front wheels. I'm sure this isnt perfect, but its probably pretty close and if you go from there you can us the not so reccomended method to get a more accurate number. Thusly my tuition has finally payed off

[crk06c]

Thanks, but I already calculated distance behind front wheels. I was actually looking for a height above axle. That way, I can calculate weight transfer and suspension deflection, and in doing so find the ideal set up based on all of the previous.

My tuition paid off, too! =p

If you need it in the future;

1995 Nissan 240sx StdWeight Distribution: 55% Front, 45% RearWheelbase: 99.4 in / 252.5 cmCurb Weight: 2815lbs / 1276.9 kg

Thanks again.

CK

[Budget240sx]

Ugh, I have this problem wth my senior design project. There is a way to figure it out, it involves lifting the front of the car to create a known angle of inclination, and then taking a bunch of measurements and running some statics. I have the "problem" from vehicle dynamics solved if you want it I can email it to you and you can give it a try. The upside of this solution is that it does not require knowing or finding wheel weight. If you do do this let me know how it works out, I am debating whether or not to run this test on my senior project or just make a guess.

[Cone Junky]

Isn't that considered roll-center? Either way, I just don't know...

[Budget240sx]

not exactly the roll center is "the point at which the lateral forces are transfered from the axle to the sprung mass. the roll center can be thought of as the point on the body at which a lateral force application will produce no roll angle, and is the point around which the axle rolls when subjected to a pure roll moment."(fundamentals of vehicle dynamics).

the center of gravity is the point at which the mass of the object can be balanced. At the tru center of gravity the object could be balanced an any direction. For engineers this is the point where we conider all forces to be acting.

hope I don't over load anyone brains

PS if anyone would like a digital copy of Fundamentals of vehicle Dynamics by Gillespie let me know.