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Hello. Since december 2011 i'm interesting by the new Hachi roku. You can't have port injection and direct injection between 3000 and 5000 rpm because the motor would overheat. I've seen a PDF from Toyota and it is said that the motor turn not enough quickly to refresh the combustion chamber. After 5000 rpm it turns very quickly and the exhaust valve open quickly to absorbe the heat. I think the D-4s system needs Toyota ingineers to be updated with Ecutek. The complexity from the system whith back pressure and injector heating is to complex for tuners. Toyota says that the injector could be damage by using DI and PI in the same time above 5000 rpm. The injectors could reach 150°C and overheat.
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