I dont see how calculating Volumetric efficency will benefit you in tuning. What you need to know is AFR and load values, and then use the knock sensor system that came with your car to adjust accordingly, chances are you will be running close to stock timing, so maybe michael will be able to help you out.
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~Phil
Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog.
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