When you reset the ECU, you reset the Closed Loop fuel and ignition tables. Closed Loop operates from 1500 RPM and up to 3800 RPM (Up to 60% @ TPS) on the GD1 and 4000 (Up to 50 @ TPS) on the GD3. So as you can see - running WOT after you just reset the ECU won't do anything for the fuel and ignition maps.
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