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MSII settings
Posted: Thu Jun 24, 2010 5:57 pm
by 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
Re: MSII settings
Posted: Fri Jun 25, 2010 7:40 am
by 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.
Re: MSII settings
Posted: Fri Jun 25, 2010 6:23 pm
by BooBoo
OK, I guess I will just set the MAP and RPM average bins 4 and hope it works.