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Originally Posted by slava
I still do not have AEM installed but have been analyzing a couple calibrations i found on AEM forum. I put the major parameters in excel spreadsheet.
Anybody care to take a look and explain the differences.
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I'll answer for the differences that I specifically know about (ie: Maps that are "mine"):
The "1311-MattStartupv1_680cc_2gencar_V1.11.cal" is my initial startup map, which is essentially an AEM basemap which has been adjusted for MAP/IAT speed-density operation, and uses a Boost Compensated fuelling strategy. It'll start up a car with 680cc injectors without any fuss and get you tuning. I think I made a few tweaks here and there.
The "Russ-FinalInitialCalibration_680_[1].V1.11.cal" map is a map which I tuned for a friend with a twin TD05-16G car. It is an early 1st gen car, which has an adjustable CAS. That partially explains the ignition sync difference.
In the "Fuel_Setup" tab, the "Fuel off below load" is at -13.1 PSIg because my motor is higher compression and has a VERY low leakdown value and breathes very easy. The ones on the "Russ" and 1000cc map look to be a bit high of values to me, but it depends a bit on the sensor accuracy as well as how much vacuum your particular car pulls at very low cruise load.
In my map, O2FB Accel Clear, O2FB DFCO, etc. are turned off. In the Russ map it is turned on as we did calibrate his O2FB before I uploaded the map. I my startup map it is just the basemap values. I my actual running map those features are enabled and the various time parameters are adjusted to work best on my particular car.
The knock strategy on the 1000ccPTE map looks pretty aggressive - meaning that it probably isn't terribly effective while tuning. The fuel add values are very low, and the decay duration is quite short.
Not sure why EGT is set up in my MattStartup map... Shouldn't be, unless I created that map for someone's specific set of mods (which would be noted in the post on the AEM Forum where you got the map if that was the case). I do have an AEM EGT probe, but it is not in use yet.