Use an accurate racecar scale that will weigh each corner of your car. A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. Make sure the vehicle is loaded with driver, passenger, and cargo just like you will drive it or race it.
|Approximation of Curb Weights
||Avg Front Corner(55%)
||Avg Rear Corner(45%)
|See Specific Vehicle Weights for Cars and Trucks
The weight balance between the front and rear of a vehicle can range widely from 50%/50% (Front/Rear) to 60%/40% (Front/Rear). If you're guessing blindly, use a 55%/45% weight balance; however, it is much more appropriate to measure your car.
Example corner weight using weight balance:
To get the corner weight of your car, take an example total weight of 3800 lbs and multiply it by the front end weight bias.
ex: 3,800 x 55% (front end weight balance) = 2,090.
Then divide that number by 2 to get the corner weight of the front end of the car.
ex: 2,090 / 2 = 1,045.
"Unsprung weight" is vehicle weight not supported by the springs. Examples include: Tire/wheel assembly; brake rotors and calipers (or brake drums and components); wheel bearings; steering knuckle; hanging weight of the control arm (or trailing arms on rear axles); differential and axle weight; 1/2 of the spring and shock absorber weights. Unsprung corner weight is usually around 70-120 lbs.