Plan · Calculate · Compare
Performance Tools for Serious Builds.
Explore gearing, power, fueling, fitment, track, and engine calculators from Scottsdale Car Care & Speed Shop—all in one focused performance resource.
Interactive performance calculators
Useful estimates before the wrenching begins.
Open any tool, enter your numbers, and calculate an estimate instantly. Results remain in your browser and are never submitted or stored.
Power & Engine
Power estimates, compression, displacement, and performanceFlywheel Horsepower Estimator
Estimate crank horsepower from measured wheel horsepower and an assumed drivetrain loss.
Boost vs. Compression
Estimate the effective compression ratio created by static compression and manifold boost.
Engine Displacement
Calculate total engine displacement from cylinder bore, crank stroke, and cylinder count.
Quarter-Mile Predictor
Estimate quarter-mile elapsed time and trap speed from crank horsepower and total race weight.
Gearing & Fitment
Tires, axle ratios, RPM, wheels, brakes, and beltsGear Ratio & Tire Size
Find the axle ratio that maintains similar effective gearing after a tire-diameter change.
Engine RPM at Speed
Estimate engine speed from road speed, tire diameter, axle ratio, and transmission ratio.
Transmission Speed by Gear
Calculate vehicle speed in up to six gears at a selected engine RPM.
Wheel Offset & Clearance
Compare approximate inner clearance, outer poke, and backspacing between two wheel specifications.
Brake Bias & Hydraulic Ratio
Compare theoretical piston area and hydraulic bias using equal-size pistons per axle.
Custom Belt Length
Estimate open-belt pitch length and smaller-pulley wrap for a two-pulley layout.
Fuel & Airflow
Injector demand, turbo airflow, ethanol blends, lambda, and coolingFuel System Sizing
Estimate injector mass flow, injector volume flow, and fuel-pump demand at 85% injector duty.
Turbo Airflow Estimator
Estimate target compressor airflow and pressure ratio for early turbo selection and compressor-map review.
Ethanol Blend Calculator
Calculate E85 and pump-gas amounts required to fill a tank to a target ethanol percentage.
AFR to Lambda Converter
Convert a fuel-specific air/fuel ratio to universal lambda.
Intercooler Efficiency
Estimate temperature-reduction efficiency from ambient, compressor outlet, and intercooler outlet temperatures.
Track & Environment
Density altitude and weather correction estimatesDensity Altitude & SAE Estimate
Estimate moist-air density, density altitude, and an approximate SAE J1349-style correction factor.