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Apexi Power Excel Software 13


on the topic of tunes, what does everyone feel when a workshop locks the maps and settings via datalogit or power excel does this not seem dodgy as all hell, i mean youve paid $500 odd for the settings, why should you not be allowed to view/see them

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As you can see from this most of my time or "operation" is spent on the top left of the Map. Now remembering that load is up and down and rpm is left and right. So based off this trace we can see I'm not hitting much load, the most is about point 10 and rpm the most I'm hitting is point 8. So the max for that trace is load point 10 which is about 2/3 of the airflow meter max on the r33 gtst (The stock powerfc and afm can only show upto 15 points for 'load' reference). The rpm is 8 * 400 = 3200rpm. So I didn't go over 3200rpm and didn't give it lots of throttle but enough to access the lower end region. So going from this my fuel economy is fairly good but I am sure I can get better so we need to drill down to the fuel cell values for those highlighted maps as I am sure they weren't tuned on the dyno as this wasn't a priority for the initial tune. More to come on this topic as I further look into my tune and try and get some better fuel economy. Consider how much time you spend on full throttle vs low or half throttle and you'll realise where your fuel economy has gone. Out the window as the majority of the fuel cells you are reading are highlighted above and they are default apexi map values so they need to be tweaked.

The issue is correctable by "extending" or "stretching" out the airflow meter reference points. This corrects it by when the airflow meter measures 3.2volts the powerfc matches that to load point 11 as an example. By default the AP Engineer PowerFC looks to reference the max load points a little early with an ugprade intake system and maxes out a little to early. This is not to be confused with the actual airflow meter maxing out at 5 volts. The correction in this case is to obtain the RB25 airflow map refence points and use them instead of the RB20 ones. This then "extends" the airflow meter range and allows it to run around the load point 15 mark on full throttle instead of the bottom of the map. This should allow for more accurate tuning as there is room for "increased" load because there are 5 or 6 "points" to advance in load before its at max again. This cannot be done with the Hand Controller as it requires the FC Pro software, Datalogit or Fc Tune to access the airflow ramp tables. 1e1e36bf2d