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For those who want to try aligning the PI and DI systems, I've found that the max opening time for the stock port injectors is ~30ms. Any further than this and you're pushing it on pure PI. The DIs are able to sustain higher RPM on their own but as I'm boosted I'm not willing to test the boundaries. My advice is that if you know you're on the boundary of PI use, then I'd go to the same RPM in DI and that way you've got good comparison data without risking anything.
I've been trialling a way to fine tune the DI Fuel Pressure Compensation tables to enable the PI and DI to be closely matched.
My method has been a bit all over the place but what I reckon is a good idea:
- Scale MAF in PI only with combined CL and OL if possible.
- Do CL scaling with new MAF scale for DI only to compare and see if an injector scaling change is required.
- Once the difference is minimal, fine tune the DI Fuel Pressure Compensations
Obviously there are things to consider, like max possible injection time and the OL portion of the MAF scale so that you don't run excessively lean.
Any questions/ideas welcome.
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