Spreadsheet for chip tuning of SD

[Bob Wooten]

is this not called linear interpolation?  you take the big number on the Y
axis & subtract the small & put that over the big number on the X axis
minus the small number.  now you have a slope of the line in between those
two points.  now multiply that by the value that you have on the one axis &
you now have the value on the other.

  Y-Y'   
(----- )  Z = Z'
  X-X'

(hope that comes readable) this sound right?  makes sense to me.

BW



> [Original Message]
> From: Dave Zug <dzug at delanet.com>
> To: <gmecm at diy-efi.org>
> Date: 1/18/01 8:08:17 PM
> Subject: Re: Spreadsheet for chip tuning of SD
>
> It uses exactly the average of the 2 if you are in the center. If you are
> closer to one than the other, it will beas the result to the cell you are
> closer to, exactly by the relative amount you are away from it.
> 
> sorry, in other words, if you are at 4100 rpm and 82 kpa then it will use
> 20% of the difference between one cell and the next, added to the lower
cell
> (given cell edges are at 4000 and 4500 RPM,      and 80 and 90 Kpa.)
> 
> yes, to understand it I actually did this in a software simulator, line by
> line back when I was a real nut about all this. ;-P
> 
> 
> ----- Original Message -----
> From: Dan Townsend <xybertron at cox-internet.com>
> To: <gmecm at diy-efi.org>
> Sent: Thursday, January 18, 2001 6:57 PM
> Subject: Spreadsheet for chip tuning of SD
> 
> 
> > I am working on a spreadsheet that will allow you to input RPM, MAP and
> BLM
> > from a Diacom capture and then average it all and output the average BLM
> for
> > a certain MAP value and RPM.  Then if your VE table has been put on the
> > spreadsheet it will multiply/divide everything to give you your new VE
> > table.  I'm almost done but I have to make sure of something first.
> >
> > Say you are at 4200 RPM and 85 kpa.  You are in the middle of the table
> for
> > 4000 and 4400 RPM and in the middle of the table for 80 and 90 kpa.  Now
> > what values does the computer use?  The higher or lower or average for
the
> > two?
> >
> > TIA,
> > Dan
> >
> >
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--- Bob Wooten
--- r71chevy at earthlink.net
--- www.r71camaro.homestead.com 


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