If you use flash based tuning software like Versatuner or Mazdaedit, you can use this VE Correction Calculator to reconfigure the values of the the Volumetric Efficiency table of your tune. This is useful if the intended RX8 has had engine porting work done and will help the ECU deliver the correct fueling. While this was designed with Versatuner in mind, it should be good to use on all flash tuning software. This table can be used with either AFR or Lambda, and either a percentage or decimal based Load value. 

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HOW TO USE: You will need to know the existing values of your VE tables, your logged Actual & Desired Air/Fuel ratios and lets you enter your LOAD and RPM for plotting your tables. Optional - not used in the calculation.

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This tool was made by us and is free to use by anyone, anytime. Always.