Welcome to Engine Speeds.







Engine Speeds is a Windows program that allows the user to experiment with gear ratios and tire sizes. Engine Speeds calculates the engine speeds at various vehicle speeds for various gearing and tire sizes.


Engine Speeds allows the user to input factors that determine the theoretical top speed of a vehicle. Engine Speeds produces a chart that displays the engine speed in each gear from minimum to the maximum road speed in that gear.


Engine Speeds expects the user to input minimum and maximum engine speeds, the number of speeds in the transmission, the final drive ratio, and the size of the drive tires.


The user is then free to enter up to twelve forward gear ratios.


Engine Speeds does not factor in tire pressures or tire growth, it can only illustrate the differences between static size tires.


Engine Speeds does not use torque or horsepower or aerodynamics or tire deflection to interpret actual speeds. But I believe it is a useful tool to compare final drives, tire sizes, and transmission ratios.



Version 1.69 25-Sep-05

First major release!!!

Nice installer program and everything works!


Version 1.73 09-Oct-05

New Windows help file; about 100K smaller download.

Changed the Gear Ratio chart so Upshift RPM is displayed before Minimum Speed.

Added Windows Calculator to Help menu.


Version 1.82 30-Aug-15

Updated to accept up to eight forward speeds.


Version 1.93 03-Sep-15

Added Maximum Speed parameter.


Version 1.95 18-Mar-16

Now up to 12 forward speeds.


Version 2.05 14-Aug-2016

Speed steps can now be 1 MPH/KPH. Min/Max RPM Steps are now 10 instead of 50.

Added Minimum MPH.


Version 2.10 19-Aug-2016

A drop-down was added to the Engine Speed container to select the Minimum RPMs option.

Tooltips can now be toggled Off/On.

The program will need to be restarted for the Off to have an effect.



Download Engine Speeds

Example HTML output

Engine Speeds Help

Engine Speeds History





Rand Fredricksen

Wheeling, IL, USA

mailto:Rand at UX5490.US?subject=Engine Speeds



Produced using PureBasic Basic Compiler.

Development began 10:30 AM CDT May 01 2005.


Copyright 2005 Rand R Fredricksen.




Modified: 21-Aug-16



See also Engine Speeds younger brother: SlotCarSpeeds



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