MAF calibration question

[Elusivellama]

Hi all, have questions...I saw LTFTs like this during my 2nd gear MAF log a couple nights ago:

1.15V - 1.18V == [-8.59%]
1.3V - 1.97V == [-3.91%]
1.99 - 3.7V == [-2.34%] (I stopped logging past like 130~ g/s)


I did 4 logs and they appear to be pretty consistent for the approximate values detailed above. So I opened up ATR, went to the Sensor Cal. Tables > MAF Table A and did the following:

a) Highlighted 1.29 ~ 1.95, hit M and entered 0.9609
b) Highlighted 1.99 ~ 3.71, hit M and entered 0.9766


I didn't touch the voltages that did -8.91%, should I have? For voltages above 3.71 (next tier up was 3.75), should I have highlighted them all (from 3.75 ~ 5) and multiplied by (b)? I understand the purpose of a MAF calibration and why I'm multiplying the values by these numbers, just wondering if I should also apply them to the lower ranges and to the rangers above what I observed...

[Fobio]

Is it Keen or Kevin? =)

segmenting them into voltage ranges is good, but don't do it blindly; the transition from cell-to-cell and range-to-range should be smooth. Furthermore, nothing wrong with adjusting the -8.59 range either, but as I've said, ensure the transitions are smooth.

At the seminar yesterday, we talked about using V and H-key in ATR to apply the smoothing.

[Elusivellama]

Is it Keen or Kevin? =)


It's Kevin.



segmenting them into voltage ranges is good, but don't do it blindly; the transition from cell-to-cell and range-to-range should be smooth. Furthermore, nothing wrong with adjusting the -8.59 range either, but as I've said, ensure the transitions are smooth.

At the seminar yesterday, we talked about using V and H-key in ATR to apply the smoothing.

Thanks for the tip, yes I have read somewhere about the smoothing function in ATR, I will go look it up and see if it needs to be applied for my ranges (ie. the transition between the last voltage with -8.59% and -3.91%, and -3.91% and -2.34%). I also understand that I will probably have to do this two or three more times and I won't get a consistent 0 LTFT, but I'll certainly try to get within +/- 2% or 3%.