Originally Posted by
jacobnbr1
As i had posted the other day that the values didn't seem to be all that out of whack and after some research and some dialouge with a few fellow mechanics we came to the conclusion that the ECM must remain in an organic state so it has the chance to accept the gas and do all the adjustments for us.
The objective is to have the ECM keep the correct mixture of air/fuel ratio and timing without doing any manual pots or add ons.
As of right now there are only two ways of doing this.
1. Changing the "baro" reading to a higher alltitude which means less oxygen than usual. That means a processed lean order from the PCM
The only problem is we are adding more oxygen to the exhaust but i personally feel just adding '' stand offs" to the ho2's will work just fine.
The only 2 questions are= Will there be any gains? and to what degree resistor do we solder in?
2. Restricting airflow to the engine.
Restricting the airflow to the engine as if it were never there to begin with..
Let's think about this for a second....
An ICE is basically an air pump, the more you can get in and out the more power you get... If the air is not recieved through the maf the engeine automatically compensates for the lack of air and recalibrates the income to the fuel mixture for you keeping a 14:7-1 ratio or thereabouts which is why when your air filter is really clogged up you don't recieve a DTC.
If you add HOD down stream of the MAF we are adding more fuel and oxygen to the system and the ECM will probaby reduce fuel trim as much as possible causing the exact reaction we desire.
I say this because the original air that is incoming is accounted for and the amount of HOD is about 1.5 l per minute which isn't a whole lot to throw confusion to the ECM.
The ECM would just pass it off as a small vacum leak somewhere around the intake manifold