Free Motorsport Tools
Practical utilities for the motorsports community to make better decisions, bring more people into the sport, and keep grassroots racing strong.
Handling and setup
Understeer and Oversteer Diagnosis
Work through understeer and oversteer symptoms by corner phase, then get targeted setup changes to test between sessions.
Diagnose balanceAutocross Shock Adjustment Calculator
Choose a corner phase, symptom, axle, and severity at the track, then get a small first-click shock or damper change to test on the next run.
ADJUST SHOCKSCorner Balance Calculator
Enter four scale-pad weights and calculate cross weight, front split, and balance.
Balance carSpring Rate Wheel Rate Calculator
Convert spring rate and motion ratio into wheel rate for setup comparisons.
Compare ratesRace Alignment Checker
Check camber and total toe against broad autocross and track baseline ranges.
Check alignmentTires
Tire Temperature Analyzer
Enter inside, middle, and outside tire temps, then interpret pressure, camber, and balance patterns before the next setup change.
Analyze tempsTire Pressure Adjustment Calculator
Use cold, hot, and target hot pressures to find the next cold pressure to try.
Adjust pressureTire Size Comparison Calculator
Compare tire diameter, ride height, and gearing impact between two tire sizes.
Compare tiresDrivetrain
Fuel and tuning
E85 Ethanol Blend Calculator
Calculate E30, E40, E50, E60, E70, E85, or a custom blend for a fresh tank, an existing fill, or a fuel correction.
MIX FUELFuel Injector Duty Cycle Calculator
Estimate injector size from horsepower target, fuel type, injector count, and duty cycle.
Size injectorsAFR Lambda Converter
Convert AFR and lambda across gasoline, E85, methanol, and race fuel scales.
Convert values