Quote:
Originally Posted by solidONE
What's weird is that the LTFT seems to want to go positive, but if you subtract the amount of stft it's actually not that far off. It seems the afr will fluctuate pretty drastically under certain circumstances and somehow cause the ltft to go positive. While with ltft positive beyond a couple percent or so the stft will be just about the same amount negative canceling out the positive ltft. But once you go into OL operation the ltft just sticks at the positive trim causing it to run rich. Does that make sense? Lol
I think this is what I'll have to do. Since the previous di/pi ratio table I had it set to fully Di in the first 3 columns (.10, .20, .30 load) Whereas the new table has it set to 70% PI from .20~.40 at low rpms. This is the area I'm getting the most trouble I think.
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There is something in the fuelling algorithms that makes OL operation much richer than we would expect - I have not been able to unpick it and the logic is very complex, but there is much written on NASIOC and RomRaider on "rich dip" on throttle application or CL/OL tranistion. A lot of people have tried to get rid of it and have ended up accepting it or deciding to run full time OL. I've partially addressed it by applying more CL fuelling using the EL Comp table at the higher MAP cells - this smooths the transition a bit, but is a bit of a messy band-aid fix.