1.6
2026-01-07
New Suspension Calculations:
- Angle Corrected Spring Rate
- Stacked Spring Rate
Age rating update required by Apple.
1.5
2023-04-11
New Drivetrain Calculation:
- RPM (from speed, axle gear ratio, transmission gear ratio, and tire diameter)
New Engine Calculations:
- Valve Spring Open Pressure
- Valve Spring Rate
Fixed an issue in the Unit Converter where Weight was not being shown as an option.
1.4
2020-08-26
Dark mode support.
New Drivetrain section that includes:
- Axle Speed
- Driveshaft Critical Speed
- Gear Ratio
- Rear Wheel Torque
- RPM After Shift
New Engine Calculations:
- Deck Height Clearance
- Valve Curtain Area
New Density category in Unit Converter.
1.3
2016-10-16
Modernized user interface.
New engine calculation: Supercharger Temperature Gain.
Additional information provided for:
- Brake Mean Effective Pressure
- Effective Drive Ratio
- Equivalent Drive Ratio
- Power Loss at Elevation
1.2
2013-09-10
Four new calculations:
- Aerodynamic Lift-Induced Drag
- Injector Flow Rate
- Port Velocity
- Wheel Rate
Additional information provided for:
- Combustion Chamber Volume
- Piston Speed
- Tire Size
Supports larger 4-inch screen on iPhone 5 and iPod touch.
Other minor enhancements and internal improvements.
1.1
2011-10-21
Two new engine calculations:
- Optimum Intake Runner Size
- Peak Torque RPM
Now includes a unit converter!
Added a tire speed rating chart.
Fixed an issue with iOS 5.