Quote:
Originally Posted by comm54
Hey Uncle Ted  I can't thank you enough for doing this for all of us!  Great spreadsheet 
i would like to know if you can tell me: Why is the "fuel trim" different? How does it get changed? If the fuel trim was "turned up" on the CAI, would it make more horsepower?
And the IAT reading: what are "Good Numbers" compared to stock? Should they be higher,lower, or unchanged?
Thanks Again and Have A Great Day! |
Fuel Trims are a result of Mass air flow measuring error.
Goes like this (Short version) Mass Air Meter (MAF) and Intake Air Temp Sensor (IAT) in MAF Measure air flow in Grams Per second per cylinder, computer calculates how much fuel is to be sprayed in cylinder, then Oxygen Sensors (O2) Read Air fuel Ratio (A/F) then Computer Trims Fuel + or - % to correct O2 error.
So if Maf is incorrect in measure actual air flow O2 pick up the slack and shows up as Fuel Trims.
Moving, Rotating, chaning the size or shape of the pipes before or after the sensor will affect readings, this is why these manufactuerers have to work so hard to find the sweet spot for each system.
Ted.