Outside Temp adjustment
Senior Member
Joined: Mar 2008
Posts: 14,599
Likes: 34
From: IN
Re: Outside Temp adjustment
some people need something else to do, I don't even pay attn to mine...I'm too busy having fun and listening to the sc whine...I whine enough about other things...
Senior Member
Joined: Jul 2009
Posts: 6,325
Likes: 777
From: Central South Carolina
Re: Outside Temp adjustment
Waldig!
That "resistor" your replacing is NOT a RESISTOR! It is called a THERMISTOR. It is a temperature variable resistor, when the temperature goes up, the resistance across its wires decrease. When the temperature goes down, the resistance increases. In no way will a fixed resistor work in this application. Your insertion of a fixed resistor in the IAT sensor is to "fool" the computer into adjusting the fuel/air ratio making it burn more gas for the air entering the intake. This does increase a little, the power you have available since it is running rich all the time. This also costs more in fuel used, but you don't care if your goal is more power.
I digress, the temperature sensor is a THERMISTOR, its function is to just display a value digitally, given its range and application. Its very word (thermistor) tells you it is a temperature sensing resistor. Its construction and function differs greatly from a fixed value resistor. If you install a fixed resistor in this application, your display will read almost a constant value across a wide temperature environment.
That "resistor" your replacing is NOT a RESISTOR! It is called a THERMISTOR. It is a temperature variable resistor, when the temperature goes up, the resistance across its wires decrease. When the temperature goes down, the resistance increases. In no way will a fixed resistor work in this application. Your insertion of a fixed resistor in the IAT sensor is to "fool" the computer into adjusting the fuel/air ratio making it burn more gas for the air entering the intake. This does increase a little, the power you have available since it is running rich all the time. This also costs more in fuel used, but you don't care if your goal is more power.
I digress, the temperature sensor is a THERMISTOR, its function is to just display a value digitally, given its range and application. Its very word (thermistor) tells you it is a temperature sensing resistor. Its construction and function differs greatly from a fixed value resistor. If you install a fixed resistor in this application, your display will read almost a constant value across a wide temperature environment.
Senior Member
Joined: Apr 2006
Posts: 25,432
Likes: 647
From: Ontario
Re: Outside Temp adjustment
Originally Posted by GraphiteGhost
Waldig!
That "resistor" your replacing is NOT a RESISTOR! It is called a THERMISTOR. It is a temperature variable resistor, when the temperature goes up, the resistance across its wires decrease. When the temperature goes down, the resistance increases. In no way will a fixed resistor work in this application. Your insertion of a fixed resistor in the IAT sensor is to "fool" the computer into adjusting the fuel/air ratio making it burn more gas for the air entering the intake. This does increase a little, the power you have available since it is running rich all the time. This also costs more in fuel used, but you don't care if your goal is more power.
I digress, the temperature sensor is a THERMISTOR, its function is to just display a value digitally, given its range and application. Its very word (thermistor) tells you it is a temperature sensing resistor. Its construction and function differs greatly from a fixed value resistor. If you install a fixed resistor in this application, your display will read almost a constant value across a wide temperature environment.
That "resistor" your replacing is NOT a RESISTOR! It is called a THERMISTOR. It is a temperature variable resistor, when the temperature goes up, the resistance across its wires decrease. When the temperature goes down, the resistance increases. In no way will a fixed resistor work in this application. Your insertion of a fixed resistor in the IAT sensor is to "fool" the computer into adjusting the fuel/air ratio making it burn more gas for the air entering the intake. This does increase a little, the power you have available since it is running rich all the time. This also costs more in fuel used, but you don't care if your goal is more power.
I digress, the temperature sensor is a THERMISTOR, its function is to just display a value digitally, given its range and application. Its very word (thermistor) tells you it is a temperature sensing resistor. Its construction and function differs greatly from a fixed value resistor. If you install a fixed resistor in this application, your display will read almost a constant value across a wide temperature environment.
Senior Member
Joined: Apr 2006
Posts: 25,432
Likes: 647
From: Ontario
Re: Outside Temp adjustment
Originally Posted by GraphiteGhost
Your recall is correct IF you were referring to a CONDUCTOR. A semiconductor such as this thermistor has different properties
Senior Member
Joined: Feb 2008
Posts: 4,508
Likes: 34
From: VA
Re: Outside Temp adjustment
You buffer the thermistor with a resistor to add to or reduce its setting at a given temperature. It will still only be right at a given narrow range after buffering, its a cheap part and not precision, Woody
Senior Member
Joined: Dec 2005
Posts: 2,809
Likes: 71
From: Holland MI
Re: Outside Temp adjustment
My A6 has a disclaimer in the user manual that the temperature reading can be a few degrees high when the motor is running just due to engine temperature. BTW, in a roadster you have a pretty good idea of the temperature all the time if you drive with the top dropped.
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