Spreadsheet for chip tuning of SD

[gary king]

Yes! it is simple linear interpolation. I didn't realize this is what was 
going on untill I read your post  I have been working on an Excel Spread 
sheet to do much of the same thing, not as far along as you however. I 
wouldn't mind seeing your sheet if you don't mind. There is a guuy on the 
tunercat list that has a C++ App to read in a Datamaster csv file, make the 
calculations and automatically modify your bin- Supposedly only works for 
the LT1.  gdkng


>From: "Bob Wooten" Reply-To: gmecm at diy-efi.org To: gmecm at diy-efi.org 
>Subject: Re: Spreadsheet for chip tuning of SD Date: Thu, 18 Jan 2001 
>21:23:1 -0800
>
>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 > To: > 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 > To: > 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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