EcuTek responded, I figured I would at least follow up with their response:
Quote:
We have seen this reported before but have not managed to find out exactly why it happens although it has been investigated by our dev team.
We think it is a strategy "hard coded" to the ECU that fires the port injectors intermittently to clean the inlet tract and the back of the inlet valves in an attempt to deter carbon build up.
I'm sorry but at this time we do not have a solution for this although I will re-open the investigation to have it looked at again.
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It sounds plausible to me. I will worry less about it since they have seen it too. With properly scaled injectors the problem is not noticeable without looking at a log. It caused a hiccup before my PI was dialed in but now it is gone.
I am still on B01C so far as I haven't noticed any problems myself outside of this, and I've been looking at logs quite closely the past couple days. I have DI nearly running a steady 4.5ms throughout pulls and I haven't observed any hiccups in my fine tuning of the PI ratios. I did have one problem but it was because I missed adjusting the PI ratio lower limit. Fueling is on target apart from that. This seems to be limited to closed loop operation, which would make sense and fall inline with EcuTek's description.
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tomm.brz I've taken note of yours' and others' info about 10% difference in the VE tables on B01C. I am still running MAF because I am not running above wastegate again until I have rocker keepers, so I do not have a reason to try SD yet, but when I am more dialed I can do some tests and see what I find.
I understand there are some issues with B01C but I am the type who likes to see/experience the problems before justifying changing something. I believe you about it, I just want to see it first.
A good test will be taking A01C as well as a patched euro ROM and seeing if the intermittent 50% PI persists. I can try it sometime in the next couple weeks if anyone else cares to see the results.