SimpleDyno

is available for download below.

To install, just download the SimpleDyno zipped file and extract the single executable file to a directory of your choice and you are ready to run! 

The software is pretty straightforward to use.  You can find instructions on the How to use SimpleDyno page.

The first time you run the software, it will create a folder called SimpleDyno on your c:\ drive.  This folder holds a simple settings file.

Although the software will calculate Torque and Power on the fly, the live results you get may not reliable. This is mostly due to noise / vibration in the system.  From version 4.0 onward, there is a "Power Curve" option that will let you perform a Wide Open Throttle (WOT) run and then curve fit the data.  It works reasonably well.  You can still just log the data and model it yourself in Excel or similar software.

I have had to remove the "Line Input" slider from the latest versions because I could not get it working reliably on Vista.  You will need to use Windows volume control panel to adjust the mic levels to suit your specific needs.

Note that current versions of the application have been produced in VB.NET Express 2010.  This means that you may have to update your .NET framework version. I originally posted a link to the Microsoft site where you can download the required software.  However, I think that using this software is a better option.  This application will tell you which .NET framework versions are installed on your computer and then guide you to the correct download sites.

If you have any problems or suggestions feel free to post a comment on the SimpleDyno Forum.

Update: 17 August 2010
Version 4.0 ST is available!  Now with added "Speed Trapiness"!

Update: 28 December 2010
There are issues still with installations of Vista and Win7.

Update: 13 January 2011
Happy New Year!  Version 4.2b is now available for download.  This is an attempt to fix some of the errors in Vista and Windows 7.

Update: 19 January 2011
Version 4.3 is now available for download.  I increased the number of buffers and optimized the audio processing to reduce latency.

Update: 20 January 2011
Version 4.4 Gompy Special Edition is now available for download.  This monitors two signal inputs simultaneously and produces a ratio result based on both RPM.  This is a one off special for Rob (aka Gompy). If you want just the regular software use version 4.3.

Update: 06 April 2011
Signal Logger Hack is now available for download.  This is a troubleshooting version only.  You should not use this.

Update: 28 May 2011
Version 5.0 is now available for download.  This is the first major update in a while.  Improvements include signal/audio recording at 44,100 HZ, second channel fully integrated for live plotting and logging, some enhancements to the Power Curve setup and fitting and an analysis section where you can overlay up to three power runs for comparison.

Update: 18 November 2011
Version X.X BETA ONLY is available. Multiple versions of the app with different sampling rates and using one or two audio channels.  This should not be considered a release version (use either 5.0 or 4.3).