MSII settings

[BooBoo]

I have a MS V2.2 with MSII daughterboard. Since I have an old board and ac only install the 1.31 of the firmware I have different setting than the manual. Can someone give me a description of these settings and a recommended starting value.

General settings
1 - MAP average BINs
2 - RPM average BINS

Warm up wizard
1 - Flood clear threshold

Acceleration wizard
1 - MAP DOT threshold
2 - Accell time
3 - Accell Taper time
4 - End pulsewidth

[Bernard Fife]

BB,

The info is mostly here: http://www.megamanual.com/megatune.htm
Parameters were added over time, but older ones mostly retained their older use whenever possible.

The MAP and RPM average bins aren't described in that document. Where parameters aren't described, your best bet is the source code. For example, in the 1.340 source code you can find:

Code: Select all

 MapAveno,RpmAveno,   // no. of points (Max of 8) for map, rpm rolling averages

Looking up MAPAveno to see how it is used in the code, you will find:

Code: Select all

  if(inpram.MapAveno <= 1)  {   // no averaging
    outpc.map = map;
  } 
  else if(map_avestate == 0)  {  // buffer not filled yet
    map_bufsum += map;
    map_buf[map_aveix] = map;
    map_aveix++;
    outpc.map = (int)(map_bufsum / map_aveix);
    if(map_aveix >= inpram.MapAveno)  {
      map_avestate = 1;
      map_aveix = 0;
    }

which is just averaging the MAP signal over the MAPAveno number of sample (from 1 to 8). RPM averaging is similar. These were replaced in later codes with 'lag factors'.

For the flood clear, you will find:

Code: Select all

700,             // TPSWOT, TPS value at WOT (for flood clear), %x10

Which means that if the TPS is greater than 700/10 = 70%, the flood clear mode will be invoked, and no fuel will be injected while cranking. Changing this value to 90 percent means you will need more throttle while cranking to invoke flood clear.

The accel info is here: http://www.megamanual.com/megatune.htm#ta

Lance.

[BooBoo]

OK, I guess I will just set the MAP and RPM average bins 4 and hope it works.