Quote:
Originally Posted by ztan
The second ECT threshold (80/75) is defined, but use of that switch in the code is bypassed, at least in A01G stock. Activating that switch requires adjustment of a single float value (at 591AC) in the ROM to greater than 100.0 - Subaru engineers disabled the switch by changing a value in the code rather than re-writing it.
Having said that, I am not sure that there will be any major benefit from having different DI/PI settings at different engine temps.
The subroutine is located at 58F8E if you want to have a go at the disassembly.
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Generally it helps to go PFI when temps are low to avoid wall wetting and wash down and also for better mixture prep. Unless engine is knock limited there is no real need for DI at low loads other than for emissions and to make sure the injectors are not carboned up by those guys who baby their engines. Since they are inside the chamber they have to make sure they are fired more frequently than the PFI injectors.