sba

Yesterday i read all the threads here about the GM Maf and everybody was telling that is pretty hard to dial the Maf traducer just right, or you need a lot of tweaking until is like stock. And i came up with an idea.

Why don't you install the GM Maf and keep the OEM Maf. Then you log with a dual channel frequency logger the frequency of the OEM and GM Mafs in the same time.
You log in the same time the 2byteload and Maf Hz by Mitsulogger or Evoscan. You try to log with both of the loggers at the same baudrate.

In the end you can put the both logs in a excel sheet and see exactly what frequency has the GM Maf at any load point vs the OEM Maf.

I have a Innovate AuxBox which can log 2 frequency channels and can log also everything via Tactrix cable, so this is even simpler.

When you are finished you take out the OEM Maf.
What do you think about this method???

MR Turco

iTrader: (16)

Should work, this is how the suby guys make a GM 3bar map sensor work with their stock ecu.

Markley02

Here is some more for you to think about. If the GM sensor was only effected by the speed of the air you would be right on. However, it is also effected by the temp and the baro of the air. The GM compensates for temp and baro differently than our ecu compensates for it. Ecuflash lets us change these values, but you would have to change the intake temp and baro pressure to take those into account also. The easiest way would probably be to find out what algorithms our ecu uses and then see how the GM compensates.

sba

You are right but if have to be easier that just trying to guess where it should be.