This is another 20 x 20 grid where the Pasted AFR values are compared to the desired AFR values, and a correction factor is calculated. A desired AFR graph used successfully on a single turbo street ported RX7 is shown below. There is some debate on what is the best AFR and this should be researched carefully before tuning. The idle AFR may vary depending on the engines state of tune.
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AFR is often a blend from a cruising range of 14.7:1 to a full boost value of ~11.0:1 for a turbo rotary. Desired AFR should consider the very different requirements for idle, cruising, midrange, high boost and high RPM.
This is a 20 x 20 grid where you define the desired AFR. Often it is a good Idea to tune the idle manually, and to delete the idle region form the pasted AFR data as well. Engine braking, and erroneous points need to be removed. When using spreadsheets to tune you need to delete any bad data points. This is a 20x20 grid where you paste in the logged AFR data. Most excel users can create the spreadsheet based on the instructions below. These spreadsheets are often available online for download, or you can make your own. To process the data a relatively simple spreadsheet can be made.
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Download a PDF version of this tutorial 5.
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