Recently my IAT sensor gave up the ghost leaving me with bad readings in the negative numbers area. Borrowed one off a friends engine to verify the problem wasnt elsewhere and my sensor was working fine and this confirmed it was the sensor because data logging showed normal readings with the borrowed sensor. The PTC sensor used on these cars is not very easy to come by here in the states plus they are expensive if found so im looking for alternatives like using the far more common NTC IAT sensor from the 1.8T or and or 2.7T engines.
To start i know that the scales are opposite from PTC to NTC. so if 0 ohms of resistance on the stock PTC sensor means -50 degrees F i will be the exact opposite on the NTC sensor meaning its maxed out at 150 degrees F. so this is pretty obvious the ECU is not directly compatible with the NTC sensor. When the NTC sensor is plugged into the stock motronic i get 120 degrees F constantly with no fluctuation in temperature at all. What i am wondering is if anyone has successfully converted from PTC to NTC? would you care to share how you did it? does anyone know the address of the IAT sensor scalar or if there is one in the motor and boost chip BIN files? or over all is this just simply too complicated to convert and i should just bite the bullet, search for a stock IAT sensor and pay out of my nose for it?
I think it would be nice to have the ability to swap to a more readily common sensor once the original one fails.
To start i know that the scales are opposite from PTC to NTC. so if 0 ohms of resistance on the stock PTC sensor means -50 degrees F i will be the exact opposite on the NTC sensor meaning its maxed out at 150 degrees F. so this is pretty obvious the ECU is not directly compatible with the NTC sensor. When the NTC sensor is plugged into the stock motronic i get 120 degrees F constantly with no fluctuation in temperature at all. What i am wondering is if anyone has successfully converted from PTC to NTC? would you care to share how you did it? does anyone know the address of the IAT sensor scalar or if there is one in the motor and boost chip BIN files? or over all is this just simply too complicated to convert and i should just bite the bullet, search for a stock IAT sensor and pay out of my nose for it?
I think it would be nice to have the ability to swap to a more readily common sensor once the original one fails.
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