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Introduction to MegaTune

MegaTune2.25+ is the Windows 95 (and later) configuration editor by Eric Fahlgren for the MegaSquirt® and MegaSquirt-II EFI controller. It allows all of the tuning and set-up parameters to be modified and has a real-time VE table editor, which allow a vehicle passenger to tune the engine while driving.

General Advice and Operation Some general principles to follow when setting the configuration parameters are:

All parameters with a red label should be set with the engine off, and the power to MegaSquirt® should be cycled (switched off and on) before starting the engine!
Always save a combination after you have changed things, and give it a de_script_ive name. that is, don't save every file as megasquirt.msq, you won't be able to recover if you corrupt a file. Instead, save files with names like msii_june2605.msq, or some other scheme that makes sense to you and lets you identify how recent a file is. Note the MegaTune will suggest a filename of the form 'datalogyyymmddhhmm.xls'. There is more on this in the 'File/datalogging' section.
When editing the tables, be sure to 'Burn Table' when you are happy with it, or the changes you make will disappear when you shut off the power to MegaSquirt®. MegaSquirt® has two kinds on memory: volatile RAM, and non-volatile flash. The contents of the RAM memory are lost when you cycle the power, the content of flash are retained (they have to be, because as well as the tuning configuration, the actual program is stored there). When you make a change in MegaTune, the values in RAM are changed and used. They are not burnt to flash until you click on 'burn to ECU' in MegaTune. That means if you make a change, don't burn to ECU, them cycle the power off and on, the settings will be the same as before you changed the RAM. You can avoid that by either always 'burning to ECU' when making a change, or saving all the values in MegaTune as an MSQ file (File/Save), then reloading it after cycling the power.
In general, change only those items you need to at first. If you are not sure what a parameter does, or whether it applies to you, leave it at the default value.
Some Warnings
Note that it is possible to damage your engine by choosing inappropriate tuning or set-up parameters in MegaTune. Be sure to read this document, and all associated tuning documents that apply to your engine, vehicle, and tuning circumstances. In particular, read the safety precautions.

How to Tune Using MegaTune

Information on tuning using MegaTune with MegaSquirt® or MegaSquirt-II is listed separately from this section, and depends on the processor you have.

For MegaSquirt, go to MegaSquirt® Tuning,
For MegaSquirt-II, go to MegaSquirt-II Tuning,
Installing MegaTune
MegaTune has an 'automated' install package, similar to most other modern Windows software. You download the set-up file (see below), click on it, and the package installs itself. You may have to select some options, or you may chose to select all the defaults. Files Get the latest version of MegaTune from http://www.megamanual.com/files/software/. Generally, you need MT2.25 for MegaSquirt-II. All versions will work with MregaSquirt, later versions often have more features. Install Process To get the latest version of MegaTune:

Click this _link_ to go to the release site,

http://www.megamanual.com/files/software/

Select MegaTune225p3_setup.exe, and click on it.
Choose 'Run' or 'Run program from current location' when prompted.
Choose all the defaults when installing the program, and it will create a folder called 'C:Program filesMegaSquirtMegaTune225' and subfolders 'mtCfg' and 'carMtCfg'.
The install program will also create a folder in 'C:Program filesMegaSquirt' called 'Car1', this is where all your vehicle specific information will go.
You need to tell MegaTune which version of MegaSquirt® you have, as well as the EGO type, etc. To do this, use the mtCfg program, which opens automatically during the installation process (it can be opened directly from the MegaTune folder at any later time). Look for the CODE_VARIANT variable, it will be in 'Car1/settings.ini/Settings/CODE_VARIANT' in the directory tree on the left side of the mtCfg window. Click on CODE_VARIANT. You can then use the drop box in the upper right section of the window to select your code variant.
While you are in the setting.ini files, you can verify or change the EGO sensor option under LAMBDA_SENSOR if necessary.

You can use mtCfg to change the color depth, temperature units (°F/C) and a large number of other parameters for MegaTune. See the documentation in the files displayed in mtCfg.

Be sure to 'Save' the file. You should now be able to launch MegaTune. Double-click the MegaTune icon (created above) on the desktop