Volcom86 Posted May 14, 2021 Report Share Posted May 14, 2021 I have a question that I am not sure about. When accelerating at a constant speed let say at 60Km and then lifting of the accelerator should the wideband / fuel go lean or rich? I have noticed on E85 it will go rich and sort of hover there. Sometimes it will correct it self and go lean. Example, coming of a highway ramp towards a set of traffic lights I would be driving at 100kmph then coasting towards the lights with out tapping the acceleration and it would be going rich. I notice the same example on my Fuel map and it goes lean while coasting. I want to know if there is something not set up correctly of if this is normal when on E85 Log file - https://www.dropbox.com/s/m6kn080z6w3yrfi/12.5.21.llg?dl=0 Thank you Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 14, 2021 Report Share Posted May 14, 2021 Yes that is pretty normal, it is due to the the fuel film evaporating from the port walls. Basically the opposite effect causes the lean patch when you open the throttle (if no accel enrichment was implemented). Some ECU's have a wall wetting model or a "decel enleanment" feature to improve it but we dont at this time. I like Shane T's demonstation: https://www.youtube.com/watch?v=LTXPF-6M1D0 Baddis and Volcom86 2 Quote Link to comment Share on other sites More sharing options...
Volcom86 Posted May 14, 2021 Author Report Share Posted May 14, 2021 Thank you @Adamw Quote Link to comment Share on other sites More sharing options...
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