Calculator – Roadkill Customs

Wheel, Tire and Fender Fitment Calculator

January 21, 2018 Roadkill Customs

Wheel and Tire Technical Information – Calculate Wheel Fitment, Tire Stretch and Rolling Radius. Includes Speedometer Error Calculator. Play with specs, try different settings and combinations, compare results… [More…]

Tire Change / Speedometer Change Calculator

July 12, 2016 Roadkill Customs

This calculator is designed to give information related to tire size changes and the general impact they have on the calibration of a speedometer. It determines speedometer error and tire size information based on published [More…]

Mr. Gasket Hot Rod Calc – Street and Strip Performance Calculator

May 13, 2016 Roadkill Customs

A great all-in-one racer’s tool available from Amazon is the Hot Rod Calculator by Mr. Gasket. This hand-held Performance Calculator is programmed to calculate your vehicle’s performance based on temperature, elevation, atmospheric pressure, and moisture content. It helps you compensate for changes in altitude. [More…]

Engine Displacement Calculator

February 4, 2016 Roadkill Customs

This calculator determines the displacement of the engine by two methods; selecting the engine to get the geometry of the configuration, or by the geometry to get the engine. You may select the engine manufacturer and designation to get the exact parameters. [More…]

Differential Gear Ratio Calculator

February 3, 2016 Roadkill Customs

Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click “Calculate Differential Gear Ratio”. The value will be returned in estimated differential gear ratio, based on the entered values. [More…]

How To Select Proper Rear-End / Differential Gear Ratio

May 7, 2015 Roadkill Customs

A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). Tire diameter, transmission choice (with or without overdrive) and desired highway cruising speed. [More…]

Speed Potential Calculator for Ring Gear and Pinion Changes

February 4, 2015 Roadkill Customs

This calculator is designed to give the potential speed values of a vehicle, based on the RPM of the engine, the ring gear and pinion gear ration, the final transmission gear ration (usually 1.00) and the tire diameter, ground to top of tire as mounted. [More…]

Horsepower Gain from Additional Blower Pressure Calculator

February 4, 2015 Roadkill Customs

Enter the anticipated blower pressure. Enter the normally aspirated horsepower at the flywheel or transmission. Click on Calculate. The value will be returned in estimated horsepower, based on blown pressure increase. [More…]

How To Calculate Size of Carburetor Needed in CFM

May 16, 2012 Roadkill Customs

Optimize performance with a correctly sized carburetor: This calculator gives the engine’s air intake volume requirements in CFM… [More…]