Long time reader, seldom post.

I'm tinkering on my own little Java VE Tuning program that pulls CSV data logs in and applys adjustments to VE based on the BLM. Pretty much the same thing as VEMaster....just trying to make my own as a personal project. If I can get it to work I'm thinking of using knock counts to make adjustments to timing as well.

Anyway, I'm having a hard time understanding the table bounds in the lower and upper VE tables in 8D. For the lower table I'm assuming the cells are centered on the following:

MAP: 20 25 30 35 40 45 50 55 60 70 80 100 (increments of 5 from 20-60 then 10 from 60-100)
RPM: 400-1600 (100 RPM increments)

Forgive me if the following isn't explained/asked clearly...

The way I understand MAP cell bounds in the lower VE table to be are:

MAP: 18.5-22.5, 22.5-27.5, 27.5-32.5, 32.5-37.5, 37.5-42.5, 42.5-47.5, 47.5-52.5, 52.5-57.5 (then in increments of 10) 60-70, 70-80, 80-90, 90-100.

Is this correct? What about the gap between 57.5 and 60?

So if I want to adjust VE where KPA reads 27 and RPM reads 1275, would the adjustment fall in MAP cell 25 or 30? Using my logic above says to adjust VE in map cell 25.

Are my cell bounds correct? What about RPM….would 1275 fall in the 1200 cell or 1300? See my dilemma??


Any help would be greatly appreciated! I’ll be happy to give out the program as soon as it’s somewhat working. It won’t directly edit the .bin file yet, just output a table that can be pasted directly into Tuner Pro or any other editor.

Dieter

92 K1500 Silverado w/L98, 8D
89 Z28 w/TPI 1959 all forged 283 v8 8D (building for a friend)

 

LOL, you gotta be kidding me knowbody knows this? Or did I really explain my question that bad?

I've got most of the application working great....just need to clearify where the responsibility of each sell in the VE table starts and stops.

Any help?

 

http://en.wikipedia.org/wiki/Linear_interpolation

 

There's a file I did on Moates site under source code...
The name is AUJP JP1.zip
The tables are detailed better than the ANHT and may give you some answers. Look at the asm or the lst file for the most detail.

http://www.moates.net/files/5)%20Sou...AUJP%20JP1.ZIP

Hopefully the link will work, Z69' tells me I'm not very good at them

 

After reading your question again, Z' had it pegged. From the way I understand it it will interpolate forward or back based on the value.
too many swiggly little things on that website though.
I was hoping to see numbers

 

Maybe I'm think, but it looks like that method requires I know x^0,y^0 and x^1,y^1.

Those are basically what I'm trying to resolve.

 

That tells you how the code calcs the values for a 3D table.
For rpm as soon as you go 25 rpm higher than the cell value.
Say 925, then the 1000 rpm cell will have an effect.
But it's a divide by 16 value so it will be a small effect.
Rpm increments by 25. So the value will not increment
up or down till the rpm changes by 25.
The map is about .4 kpa per increment. 104/255
Or that's how I think it works at least.
There is some rounding involved in the calc's and I haven't calc'd to see when it will round up. It may be a 12.5 rpm delta will cause a round up. I'm still not any good at the 16 bit stuff so 8D Rpm/25 calc

The source for VEmaster is on Moates.net. See how he did it.

And JP's links work for everyone but me best I can tell