How to change xdf

gtomlarson · Post by **gtomlarson** » Sat Mar 17, 2012 1:41 pm

Can you change the 8d xdf temp tables to
show F degrees and not C degrees

Six_Shooter · Post by **Six_Shooter** » Sat Mar 17, 2012 4:31 pm

Yes, it requires modifying the XDF itself and the calculation. Do a search on here, to find instructions of how to do it.

gtomlarson · Post by **gtomlarson** » Sat Mar 17, 2012 5:08 pm

I tried but can't find anything

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 9:35 am

I know how to edit the xdf, I need to know
what constant to put in

EagleMark · Post by **EagleMark** » Sun Mar 18, 2012 9:44 am

There may be a simpler fix? I just looked at a couple $8D xdf and one is much larger and has a temp conversion table built into every setting that has to do with temp so you can just look at parameter comments when making the change. Also some other $8D stuff here:

http://www.gearhead-efi.com/Fuel-Inject ... rmation-8D

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 11:09 am

a temp conversion table built into every setting that has to do with temp so you can just look at parameter comments when making the change. Also some other $8D stuff here:

I don't know what you mean by parameter comments,
can't find it anyware. Sorry

EagleMark · Post by **EagleMark** » Sun Mar 18, 2012 11:18 am

If there is a comment in the paremeter in XDF and you hover over it it will say what's there. Or click View, Paremeter comments or click the Paremeter comment button.

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 1:29 pm

EagleMark wrote:If there is a comment in the paremeter in XDF and you hover over it it will say what's there. Or click View, Paremeter comments or click the Paremeter comment button.

Sorry. still don't get it, this is what i'am trying to change
Fan 1 Enable Temp.

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 2:11 pm

I think I got it this is the expression they have
0.750000 * X + -40.000000 what would I replace it with

dfddfd2 · Post by **dfddfd2** » Sun Mar 18, 2012 2:54 pm

gtomlarson wrote:I think I got it this is the expression they have
0.750000 * X + -40.000000 what would I replace it with

((0.750000 * X + -40.000000)*9/5) + 32

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 3:05 pm

dfddfd2 wrote:
gtomlarson wrote:I think I got it this is the expression they have
0.750000 * X + -40.000000 what would I replace it with
((0.750000 * X + -40.000000)*9/5) + 32

Thanks I will try it and see what happens

EagleMark · Post by **EagleMark** » Sun Mar 18, 2012 3:07 pm

If you click on the Fan enable temp and open the box, then go to button on top row that says View, then down to Paremeter comments a box opens with paremeter comments and has the C to F conversion in it. In the $8D Mod xdf someone made.

I guess you could change the conversion to come out in F but the entire bin is done in C. Using a conversion calculater would be safer...

gtomlarson · Post by **gtomlarson** » Sun Mar 18, 2012 4:42 pm

thanks guys works fine

gtomlarson · Post by **gtomlarson** » Sat Apr 28, 2012 5:16 pm

dfddfd2 wrote:
gtomlarson wrote:I think I got it this is the expression they have
0.750000 * X + -40.000000 what would I replace it with
((0.750000 * X + -40.000000)*9/5) + 32

What would the conversion factor be for a table that has
rows to change them to F degrees

Post by **robertisaar** » Sat Apr 28, 2012 5:42 pm

you want to change the labeling of the table to convert to/from *F?

http://www.wbuf.noaa.gov/tempfc.htm

that's the easy method.

gtomlarson · Post by **gtomlarson** » Sat Apr 28, 2012 6:54 pm

I'm after the conversion factor so I can change the XDF so all
my changes wii be in F degrees the factor it has is 1.000000 * X + 0.000000 what would I change to so it would come out in F

Post by **robertisaar** » Sun Apr 29, 2012 8:47 am

0*C = 32*F

10*C = 50*F

for every 10*C change, there is a change of 18*F

so instead of 1.0 * X, it will be 1.8 * X.

and to deal with the offset, change it to + 32

so X * 1.8 + 32 = *F, if starting with a value that was originally X * 1 = *C.