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You guys need to remember with DI spraying too early will just send fuel out of the exhaust valve. The goal is to get as much fuel into the combustion chamber in the spray window. There is no drop in power if you spray a little past 180 (BDC) because the piston speed is slower right after BDC and with aftermarket cams and boost, the intake valve is still open and assisting fuel mix with air in the chamber.
But if you really want to know what SOI And EOI window you car likes, put it on the dyno and test or take it to the track and test.
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GM Gen V Calibrator
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