Originally Posted by
GR8GAME
...
This is a GM 8 wire MAF.
It houses the Humidity + BARO + MAF + IAT all in one!!!!!!!!!!
So, think about it. You have a sensor that is trying to calculate something it was never intended to be...a BLOW through design sensor with boosted + heated air.
Now, if I were to make this a DRAW through MAF, I would still have problems. I wouldn't have the correct IAT readings of what is going into the motor for my Spark vs IAT table.
And right now, I'm having incorrect BARO readings since I am making my own atmosphere under boost conditions right now as a Blow Thru design.
So, I'm thinking to make this "Right", I have to either...relocate the BARO section of the MAF. OR, make it a Draw thru design and relocate the IAT (and that's not taking into account the humdity reading as well!!!!!!!)
Because the GM factory Supercharged vehicles have two IAT sensors in them. So they have the proper sensor setups for PROPER atmospheric condition changes. They are also a DRAW thru design with the sensors needed for all of these factors.
Here is my fear:
I tune Dodge's as well. They are Speed Density with 02 corrections. They have no MAF sensors. On my Hemi builds I have to tune them in the winter or late nights in the summer and be VERY conservative with the AFR settings. Why? so as to not go lean when they go into boost when it's cold out. I get a full AFR reading change from cool to hot!!!!!
So in this GM processor, my fear is that if I have a BARO sensor that is reading boost...that's not a proper indication of what the ACTUAL BARO is outside. So that when the customer goes up in elevation, it will be an unknown condition for the customer since it is in a position in which it will read boost!
So, I either copy what the poster did in #20 and make my own connector and take the BARO out of the MAF sensor and hook up the customers stock MAP sensor and put it in the air box OR I change the MAF to a draw thru and relocated the IAT into the blow thru tube.
Either way, I'm thinking that we need to have the 2-bar MAP sensor do the work of the boost and the BARO sensor do the work of the atmospheric correction...which seems to me the way to go since that's how GM seems to have the processor strategy setup to do so.
How's my thinking on this one?