Unsprung Weight Calculator

Professional Unsprung Weight Calculator for Race Cars Dave's Unsprung Calculator is a specialized tool designed by race car builder Dave Clark for calculating unsprung weight, spring rates, and ride frequencies on race cars equipped with dual-spring coilover setups. What It Does: This app helps you estimate your vehicle's unsprung weight using spring measurements and corner weight data. It's specifically designed for typical race setups with dual springs on a shock body with a coil carrier and slider mechanism. Key Calculations: • Total Spring Force - based on free length vs. ride height measurements • Bump Rate - single spring rate when the slider contacts the cancel-out nuts • Combined Rate - dual spring rate when both springs are active • Bump Frequency - natural frequency at bump rate • Combined Frequency - natural frequency at combined rate • Unsprung Weight - calculated from corner weight and spring forces How It Works: By measuring your springs' free length and their compressed length at ride height, the app calculates total spring force. Combined with your corner weight and motion ratio, it provides accurate estimates of unsprung weight and both single-rate and dual-rate ride frequencies. Built for Real Racing: • Handles dual-spring setups with sliders and cancel-out nuts • Accounts for motion ratio and spring angle • Shows bump rate when slider is hard on the stop • Shows combined rate when there's a gap to the slider • Quick, reliable calculations trackside Features: • Nine essential input fields with clear labels • Save and load multiple configurations • Clean, easy-to-read results display • Helpful documentation built in • No ads, no subscriptions, no data collection Who It's For: Race car builders, suspension tuners, team engineers, and serious racers who need accurate unsprung weight estimates and frequency calculations for setup optimization. About the Developer: Custom written by race car builder Dave Clark. As a race guy building tools for racers, this calculator reflects real-world trackside needs and proven suspension theory. Contact: dave@daveclarkracing.com Web: daveclarkracing.com