Excel File:
To make it easier for people to help correct any errors and expand the number of maps we have available, I'm going to include a link to my original excel files. This link will be kept updated along with the rest of this thread, so any added charts will also be added to the file. I'm going to upload it to a free file server instead of attaching it to this post because the file is pushing the 976.6 kB file limit as it is, so any additions may push it over the limit.
Excel Files
How to Generate Your Own Turbo Maps:
The following is a "How-To" describing the process I used to create the maps featured later in this thread. To make this a process available to everyone, I have simplified it to use only two basic programs, Excel and Paint. A link to the required .xls can be found above. All steps are accompanied by visual aides. (Click to enlarge.)
Step 1:
Get a hold of a flow map for the turbocharger you wish to analyze. They can usually be found on the internet in GIF form. Our first step is to determine the range of the Pressure Ratio and Air Flow axis of the original chart. Doing so will allow us to properly scale our map.
In our example map the Air Flow axis has a range of 0-50 lb/min with an interval of 5 lb/min, and the Pressure Ratio axis has a range of 1-4 with an interval of .5.
Step 2:
Creating a new chart from scratch would require a good deal more work, so we are just going to modify an existing one instead. But first, we have to make a copy of the existing map so we don't erase our previous hard work. To to this, open up the Excel file and select a chart that uses the same units as the map you are going to analyze. The example map we are using is a Garret map, so the units are imperial (lb/min). If we were using a Mitsubishi map the units would be in SI (kg/s). Once you have found a chart, right click on its tab bottom of the screen and select "Move or Copy...". A window will pop up prompting you to select the destination of the chart. Because we are creating a copy, do not modify the destination parameters, just select the "Creat a copy" check box at the bottom of the window and hit "Ok".
You should now have a copy of the original chart. You can rename this new chart by right clicking on the chart's tab and selecting "Rename". You can also change the title on the top of the chart by selecting it and then clicking somewhere within the text. (Do not double click however, this is a different function.)
Step 3:
The chart must now be adjusted to the ranges found in Step 1. To do this, right click on an axis and select "Format Axis...". A new window will open up. Go to the "Scale" tab and enter in the new range data. When you are finished hit "Ok". Repeat this for the other axis.
Step 4:
Here comes the sneaky bit that makes this so simple. Excel allows us to use a custom background for our chart area, and because Excel generates all of the axises and titles for us, all we need to do is cut out the center section of our turbo flow map. Open up your turbocharger flow map in paint and select just the inner part of the map with the rectangular selection tool. Got to "Edit->Cut" or hit 'Ctrl-X' to cut out the selected area.
Next, open a new image using "File->New" or 'Ctrl-N', and paste the selected area into it using "Edit->Paste" or 'Ctrl-V'. You can now save this new area in any format you like (preferably GIF or JPEG) by going to "File->Save As...".
Step 5:
To tell Excel to use this new image as the background for our chart, right click within the plot area and select "Format Plot Area...". A new window will pop up. Hit the "Fill Effects..." button. Another new window will pop up. Hit the "Select Picture..." button and navigate to where you saved your map section from Step 4. After selecting your saved image, hit "Open" and then hit "Ok" on the two other open windows.
TADA! You have just created a turbocharger flow map with an overlay of the data for the K20Z3 engine!