MAF Hz formular correction
#1
Evolved Member
Thread Starter
MAF Hz formular correction
I have been rescaling my MAF and noticed the MAF Hz formula didn't correctly convert from display back to ROM, Not sure if this has been changed in later xmls, but here it is for your interest.
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="x*64/6.29" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="x*64/6.29" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
Last edited by burgers22; Feb 21, 2012 at 12:52 PM.
#2
Former Sponsor
iTrader: (12)
I have been rescaling my MAF and noticed the MAF Hz formula didn't correctly convert from display back to ROM, Not sure if this has been changed in later xmls, but here it is for your interest.
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="64/(6.29*x)" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="64/(6.29*x)" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
-Jamie
(jack_of_trades)
#4
Former Sponsor
iTrader: (12)
I have been rescaling my MAF and noticed the MAF Hz formula didn't correctly convert from display back to ROM, Not sure if this has been changed in later xmls, but here it is for your interest.
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="64/(6.29*x)" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="64/(6.29*x)" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
<scaling name="MAFHz" units="Hz" toexpr="6.29*x/64" frexpr="x*64/6.29" format="%.0f" min="0" max="5000" inc="1" storagetype="int16" endian="big"/>
-Jamie
#7
Evolved Member
Actually the correct eval is x*64/6.25
6.29 will give 1610Hz, but it should be 1600Hz, so 6.25.
A minor detail but if you want to be accurate....
6.29 will give 1610Hz, but it should be 1600Hz, so 6.25.
A minor detail but if you want to be accurate....
Last edited by merlin.oz; Oct 31, 2013 at 12:54 AM.
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