Maths key tuning

[zedvl]

HI Guys I was testing the pc logger/maths key operation before i get on the dyno to see if I can minimise the time spent on the dyno so i recorded a little bit of data and brought the two screens up upon pressing the M key it asked(if i can remember) measured a/f so I put the figure in ,and the a/f set point I actually thought that set point would of already been what the a/f logged set point is,so i proceeded to put it in and then pressed ok and the site that it over never changed is there something i have missed. Sorry if i am not clear enough.ECU SM4 V1.09

[supercharged88]

Are you logging both A/F Ratio and A/F Setpoint.
Set both values to minimum 10;1 and maximum to 30;1.
When you say you have both screens open, i take it you mean the Base Fuel table and the Logger Graph.
Simply scroll along the graph monitoring the points that are too rich or lean.
When you look at the Base Fuel table a GHOST box will move along corrisponding to the LOG.
Click on the Ghost box cell and press M.
Target A/F ratio should be there already and you should only have to type in the actual measured A/F ratio.
Make sure you are also logging the load source EG; MAP/BARO or TPS.
Sorry if you know this already, just a little hard to decifer what you do know and dont.
Maybe post your Cal File so we can check your settings.

[underpsi68]

If the cal has changed from the time of the log the meth key will not change the cal. I red window will pop up when this happens.

The math function works great btw.

[zedvl]

Thx guys I got on today I had a few cells Autotuned and think it might of caused it, if the ghost site is not directly over the cell will it change the nearest cell because I had an issue where it wasnt changing the cell.Cheers

[supercharged88]

The cell that you highlight with the mouse will be changed.
You need to have the ghost box as close as possible to covering a cell completely for the most accurate tuning.