It would be very useful to have an accurate description of each EVOScan parameter. I would like to start a list that can be modified to what is agreed upon/proven to be correct. Does this make sense?

Accel Enrichment:
Fuel enrichment based on TPS?

Coolant Temp:
self explanatory

Engine Speed:
engine rpm

Fuel Trim, Low, Medium, High:
long term fuel trim. low, medium, high rpm or load or ??? what are the break points? do the long term fuel trims effect open loop?

Oxygen Feedback Trim:
short term fuel trim. does not effect open loop?

Oxygen Sensor:
main oxygen sensor output, 0-1V narrowband

Oxygen Sensor #2:
secondary oxygen sensor output, 0-1V? EVOScan scales to 5V?

Throttle Position:
throttle position sensor %

Air Flow Hz:
MAFs (Karman Vortex) frequency

Air Temperature:
intake air temperature (from MAFs?)

Air Volume:
calculated air volume? number don't look correct in EVOScan

Barometer:
barometric pressure from MAFs?

ISC Steps:
idle speed control motor

Knock Sum:
filtered knock level, 0-32?

Timing Advance:
self explanatory

Load:
??

Injector Pulse Width:
injector pulse width in milliseconds. includes latency?

Battery Level:
battery voltage at ECU

AFR Map:
???

Load Calculated:
approximation to find x-axis in ECUFlash?

EGR Temperature:
self explanatory

Octane Level:
100=high octane maps, 0=low octane maps, in between is interpolated ???

Speed:
vehicle speed from vss

MAP:
calculated boost in kpa using a VE table with rpm & air flow? only accurate for stock cars

 

AFRMap:
I noticed that it only changed from a base value of 128 to something higher when I went WOT (so the TPS maxxed). It is also used in the LoadCalc calculation.

MAP:
On my 05 at least, the 'units' don't seem to be Kpa at all. When I was doing a 3rd gear pull, starting at 2k rpms, it maxxed out the MAP reading at 328.16 at ~2300rpms. I'm guessing that was roughly when the car went into boost, so it's equal to a very low boost pressure; say 0-2 psi. So I'm guessing that the MAP reading tells the ecu when to switch from closed loop to open loop operation. Just a bunch of guesses!

 

Oxygen Sensors can go to 5volts if really rich I have seen stock narrowband sensors go over 1 volts (i.e 9.0 AFR on a wideband - not a good operating figure, lol)

 

maybe I'll put some notes into EvoScan for each param.

 

wait so evoscan isn't ready to use? i need to change stuff?