1. Is this still the same rough map for the PE1820 turbo, or have you done changes or auto-tuning at all?
2. What is the AFR at knocking events?
3. Have you tried other gas instead of Sunoco?
4. Have you tried other plugs instead of NGK Iridiums? (IK22, IK24, etc)
5. What is your knock threshold map showing below 2400?