Hot Rod Calc 10.3.0

Road and Strip Performance Calculator for iPhone and iPad

While perhaps obvious, it is important to note that switching from an iOS device to a non-iOS device requires purchasing a new license due to incompatibility.

This tool is particularly useful for bracket racers, hot rod owners, engine builders, automotive enthusiasts, and bench racers seeking accurate performance predictions and adjustments.

Introductory pricing is offered at a competitive rate.

• Provides predictions of elapsed time and speed based on motorsport-standard atmospheric corrections.
• Allows calculation of how current track conditions influence vehicle performance.
• Includes an integrated user’s guide with functionalities such as pressing and holding keys for detailed assistance.

The ET prediction calculator, equipped with built-in engine tuning solutions, facilitates quick performance assessments without the need to memorize complex formulas or consult tables. At the track, racers can evaluate how weather conditions and elevation impact their times, enabling instant dial-in predictions based on real-time data. In the garage, engine builders and tuners can analyze how modifications to the engine and fuel system affect overall performance, rapidly resolving numerous "what-if" scenarios.

Key capabilities include:

• Calculating engine displacement in cubic inches, liters, or cubic centimeters.
• Optimizing air-fuel efficiency for improved engine performance.
• Assessing the impact of tire size changes on gear ratio and speedometer accuracy.
• Performing fluid conversions among gallons, fluid ounces, cubic centimeters, milliliters, liters; temperature conversions between Celsius and Fahrenheit; weight conversions across metric and imperial units.
• Automatically computing Brake Horsepower from Torque and RPM, or ET and Vehicle Weight, or MPH and Vehicle Weight.

Built-in Solutions

• Predicts elapsed time and trap speed for quarter-mile and eighth-mile runs.
• Automatically calculates Brake HP given Torque and RPM, ET with Vehicle Weight, or MPH with Vehicle Weight.
• Allows entry or calculation of track conditions including absolute pressure, air temperature, humidity, elevation, air density index, density altitude, wind speed, and direction—predicting their effects on elapsed time and speed.
• Calculates vehicle speed from parameters such as Vehicle Weight and Horsepower or Tire Diameter, Gear Ratio, and RPM.
• Enables visualization of how adjustments to engine parameters—like deck height, dome volume, chamber volume, gasket thickness, bore size, stroke length—can increase compression ratio.
• Permits input of target engine displacement and current stroke to determine new bore dimensions, or vice versa.

Additional Features

• Fluid conversion tools for various units including gallons, fluid ounces, cubic centimeters, milliliters, liters; temperature conversions; weight conversions; supporting metric and imperial systems.
• An option to calibrate the calculator’s mechanical efficiency setting for more precise time predictions aligned with specific vehicles.
• Calculates fuel correction index to assist in determining appropriate jet flow requirements.
• Includes built-in help documentation with full specifications for Jet sizes from Holley® — simply press and hold a key to access comprehensive definitions, explanations, and example calculations.