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Topic: Fuel Trim calculation - (Read 4310 times)
vavjettaw36
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Fuel Trim calculation -
« on: October 05, 2016, 12:27:27 PM »
From this link:
http://nefariousmotorsports.com/forum/index.php?topic=7596
Does anyone know the appropriate line to put in the ECU file to enable rka_w/rka2_w? not sure what the memory address is and google brings up 3 results and they all point to the link above.
Currently on audi s4 M box
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nyet
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Re: Fuel Trim calculation -
« Reply #1 on: October 05, 2016, 12:39:07 PM »
Those are both autodetected by ME7Info for Mbox.
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ME7.1 tuning guide
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ECUx Plot
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vavjettaw36
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Re: Fuel Trim calculation -
« Reply #2 on: October 05, 2016, 01:31:46 PM »
You are right. The real values to use, rkat2_w and rkat_w were already in my ECU file. Or at least they came closer to the LTFT Idle values of VCDS.
I used fra_w, fra2_w for idle and rkat_w and rkat2_w and these were the values I calculated:
LTFT multi: (fra_w-1) * 100
LTFT2 multi: (fra2_w-1) * 100
LTFT idle: rkat_w
LTFT2 idle: rkat2_w
Result:
.60 (vcds .60)
.51 (vcds .40)
5.85 (vcds 5.5)
2.53 (vcds 2.3)
Not perfect but close enough. Probably not a significant difference.
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