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~Tech Page Glossary~

Kevin $laby
Tech@BaselineSuspensions.com



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Finding the Center of Gravity (CG)

~Method 1~

Here is the procedure for mesuring the weight distribution of the vehicle to locate the position of the Center of Gravity (CG):

This first method is for people who have access to 4-wheel scales.
Method 1:
1. For best results the car should be "race ready" with Fuel, Driver, N2O bottles, Proper air pressures, etc.
2. Take a measurement of the front and rear weights. (No need to measure the total weight of the car for these calculations).
3. Measure the wheel base. I measure from the Front Edge of the Front rim to the Front Edge of the Rear rim.

Example:
Weight of front end: 2000lbs
Weight of rear end: 1800lbs
Wheel Base: 105"

2000 + 1800 = 3800lbs (This may not be the same as the measured vehicle weight because of unlevel ground or scale accuracy, etc)

2000 / 3800 = .526 ~ Front end distribution = 53%
1800 / 3800 = .473 ~ Rear end distribution = 47%

05" x .53 = 55.65" The Center of Gravity is located 55.65" in front of the rear axle.
OR
105" x .47 = 49.35" The Center of Gravity is located 49.35" behind the front axle.

*Both of the above measurements locate the CG in the same place.

This second method is for people who do not have access to a 4-wheel scale.


~Method 2~

Method 2:
1. For best results the car should be "race ready" with Fuel, Driver, N2O bottles, Proper air pressures, etc.
2. If you do not have access to a 4-wheel scale then you can use a drive-on scale like at the race track, a farmers COOP, Truck stops, etc. The scale needs to be level/flat with the ground.
3. Make a mark with a piece of tape (or chalk or ??) somewhere on the drivers side rocker panel. This doesn't have to be exactly in the middle just somewhere in the middle.
4. Drive the car onto the the scale so the tape is on the edge of the scale. Only the front tires will be on the scale. The rear tires will be OFF the scale.
5. Take a mesurment of the weight.
6. Now drive off the scale until the tape is aligned with the back edge of the scale. Only the rear tires will be on the scale. The front tires will be OFF the scale.
7. Take a measurement of the weight.
8. Measure the wheel base. I measure from the Front Edge of the Front rim to the Front Edge of the Rear rim.

Example:
Weight of front end: 2000lbs
Weight of rear end: 1800lbs
Wheel Base: 105"

2000 + 1800 = 3800lbs (This may not be the same as the measured vehicle weight because of unlevel ground or scale accuracy, etc)

2000 / 3800 = .526 ~ Front end distribution = 53%
1800 / 3800 = .473 ~ Rear end distribution = 47%

105" x .53 = 55.65" The Center of Gravity is located 55.65" in front of the rear axle.
OR
105" x .47 = 49.35" The Center of Gravity is located 49.35" behind the front axle.

*Both of the above measurements locate the CG in the same place.

 

Height of the Center of Gravity:
There is a procedure that allows you to measure the height but this includes raising the car 2-3 feet off the ground while on scales and replacing the shocks with solid bars, etc.
BUT for most doorslammers in order to find the Height of the Center of Gravity (CG) just measure the distance from the ground to the centerline of the camshaft.


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