Race Engineering: Method for measuring unsprung mass on a race car.
Here is a practical method for measuring unsprung mass on a race car.
- Corner weight car. Recording total mass on each corner.
- Raise the car 2 or 3 inches (40-60mm) –> Jack on unsprung area
- Disconnect one end of spring damper –> Use spring clamps (preload – be careful)
- The scales should show the unsprung mass at each corner –> minus or add half spring damper
- For each corner calc sprung mass –> take the unsprung mass from the original total mass.
Consider / Remember:
- Suspension joint friction –> Try freeing up
- Live axle implications –> If any
- Contribution of the spring damper in the calculation –> Take half its weight and correct figures
- Driver weight –> Should include
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