207

iTrader: (1)

I decided to fine tune my ignition map based on the boost levels so I wanted to make sure the GM 3 bar maping scaling was good. Once I charted the logged PIM against advanced PIM V values and compared the line to the DL programmed scaling of 6525, offset 0, there is a fixed difference between the scaling program and the log results.

I have attached a chart of the scaling program vs actual log values for PIM and PIM V. I can't understand why there is a fixed difference. I want to use the DL readings to determine boost and tune IGL.

My two questions are:

1 What is the reason there is a difference between the log and progamming?
2. Without having to calibrate the 3 bar sensor is the formula V*8.94-14.53 adequate enough for determining the boost level from the DL?

207

iTrader: (1)

Okay..I think I figured out why but can't believe I had this wrong all this time. I was using a linear formula of V*6300+800, which is what I calibrated the map sensor to over two years ago. I entered the scaling as 6300 and offset as 800, but is seems the pfc subtracts the offset so it has been running at V*6300-800.

I don't want to change my scaling becasue the AFR's are pretty good and the car runs well. I just need figure out what the correct boost levels are and adjusted my ignition tuning.

arghx

iTrader: (3)

sometimes you just have to work around things like MAP sensor scaling because it's too much trouble to retune. I have the fuel and timing on my friend's FD built around the incorrect factory scaling.