Re: MAFT Pro
You could street tune it, it just can be tricky to verify if the ignition timing function is working right.
DSMLink is the easiest system on any car to tune as long as you don't have phantom knock. With the MAFT Pro you have to tune a 255 cells in the fuel VE map or at least do the math or guess based on cells that you have actually tunes versus 16 fuel sliders in DSMLink and those fuel sliders don't even do anything until you are making a good amount of boost. The stock DSM MAS's have IAT sensors and if you run a GM MAF, then the air temp is part of the calculated airflow, so they are doing something for changes in temp. Often the temp compensation of speed density systems is worse. If there is a tunable table for the IAT sensor in the MAFT Pro, then you could try to dial it in, but often IAT sensors suffer from heatsoak or you might have 2 runs with exactly the same temperature, yet your A/Fs are much different. A lot of people with AEM EMS's don't even run an IAT sensor on turbo cars, especially if they live in better climate than ours, since under boost their temps are always 90-140 degrees and not much trimming is needed in those areas. If IAT are getting too hot, you cam have it start adding fuel to combat knock, but that is the opposite of the ideal gas law(which works less than ideal in the real world). IAT readings are actually most useful for ignition timing, normally you have it start pulling timing when the temps get too hot.
It would be something interesting to do, just don't expect it to make life easier or make a lot more power. Speed density systems don't compensate at all for mod changes or small changes in the setup. You can tune a DSM or Evo then throw some aftermarket cams in it and the A/Fs under boost will pretty much stay exactly the same. You change anything on a Honda or FD RX7 and they need a retune.
You will still need a real datalogger to monitor fuel trims for part throttle/idle tuning, knock sum and ignition timing.
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