Mario_Marques -
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Originally Posted by Mario_Marques
cfg83 my english is not good, it seems to me, in your teste, the trick it's not the iat but the real temperature?
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Sorry. My english is messy. The first two runs use different resistors :
Run 1 = Resistor #1 => IAT @ 200 degrees F => 57.07 MPG
Run 2 = Resistor #2 => IAT @ 247 degrees F => 62.93 MPG
The last run is my HAI with normal IAT sensor :
Run 3 = normal IAT sensor => IAT @ 132 degrees F => 55.03 MPG
All MPG numbers are from the scangauge.
Quote:
Do you have any software to teste lambda values and ignition and injection timing?
It's possible to see what changes when you change iat value, because i think your ecu will pick other values to adjust mixture, maybe lambda value.
In my case my car uses maf value, water temp and fuel temp, for example, if i want to inject more fuel i will cheat the diesel temperature sensor(tell it that the fuel is very hot), so it will inject more(injection time will be bigger), but if my maf is reading to much air also teh quantity in that time will be big; crossed information in ecu.
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Hmmmm. I do not think all things that work for diesel work for gas. But you know more than me. I am saying what I have learned on these forums. I am not a heavy-duty car guy.
Also, I do not have software to test the lambda values. I can datalog all OBD-II parameters, so I can make a test where I save the IGN (ignition timing) value to see if it changes.
I definitely think the IAT resistor mod will work when the engine is cold, because that is when the ECU/PCM is in open-loop mode.
CarloSW2