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Intermittent Port Injection During 100% DI Operation
I am forcing 100% direct injection. EcuTek B01C on RR 12.1, 42154.
While running 100% DI the car will intermittently switch to 50% port injection. It hits 50% PI then immediately switches back to direct. This will usually happen two or three times throughout a 30 minute cruise. While driving I thought it was the CL/OL transition, but it occurs during steady CL operation.
It is not causing a problem for tuning, however I am curious as to why the ECU is doing this. I've attached a screenshot with my PI/DI ratios and log sample.
I initially tried to force 100% DI through custom maps, but something else in the ECU was overriding the fuel ratio output. Fuel ratio would switch rapidly from 0% to 100% with my map enabled. Using the stock ratio maps gave better results beyond the intermittent hiccup.
Has anyone else seen this before? Is it typical with these ECUs, or is it possibly a bug in EcuTek / RR 12.1? I don't recall seeing this issue when I last tuned the car with RR9.
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