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Internal gate- remove the wastagate arm
external gate- remove the spring or disable the valve somehow
it will run like an N/A engine
As to timing- start with around 9* btdc of timing at 15-18psi of boost when using 93 octane. Interpolate that to 0psi region slightly less than N/A timing (around 20-22* of timing at 0psi, with 15-18* through peak torque region).
Then, take it to a dyno and add a couple degrees. If it picks up a significant amount of torque due to 2 extra degrees (perhaps 5 to 10% in torque) then you made a good move. Otherwise, reduce it back to where it was.
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