[mbtoloczko]

Originally Posted by b3lha

Here is an excel spreadsheet, with some pretty graphs. It shows the fuel, timing and knock correction maps of Nomake's USDM SVX compared with my JDM cars.

Hopefully this will be interesting reading for guys that understand tuning stuff.

I haven't yet figured out the units, so the numbers are rather arbitrary. Note also that the X and Y axes are reversed on the knock graphs compared with the others. (It looked better that way).

Nice job you guys! Are the load units in your plots simply the decimal representation of the hex values? Kinda curious because the load range for the timing map appears to be wider than for the fuel map. Seems unusual.

When you get into reading the assy code, you'll probably find that load is measured from MAF/RPM (with some temperature scaling as well). Usually a load of 100 the maximum value on a NA car. There may be an extra column beyond 100 to be sure that all possible conditions are represented.

I saw the early threads on interpreting TPS values. For the Evo, TPS voltage = TPS signal *5/255.

I'm also guessing that the knock correction of 128 is 0x80 and represents zero correction with a possible range of 0 to 255.

In a way you guys have it easy in that the size of the code is relatively small. My Evo ROM has roughly 256 KB of code (including table data). The relatively small code size for the SVX should make it pretty easy to decipher.