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Old 12-27-2004, 02:21 PM   #1
Twerthi
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Default What is the electrical resistance of the EGT sensor?

Would anyone be able to tell me what the electrical resistance of the factory EGT sensor is? Or be able to point me in the direction to find such information?

Thanks
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Old 12-27-2004, 02:27 PM   #2
Mulder
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It's a negative coefficient thermistor, meaning its resistance decreases with increasing temperature. I don't have a full temp-vs.-resistance chart although there may be one posted someplace.
On a cold engine the resistance reading will be very high and may even read infinite or open on a typical ohmeter. At normal operating temperatures it should read in the kilohm range or less.
Note that the "fix" for a missing EGT probe is a 2.2K ohm resistor which simulates a reading of about 1400F (IIRC).
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Old 12-27-2004, 02:40 PM   #3
Twerthi
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Hmm ... a lot of that is over my head. Was trying to gather information for an Electrical Engineering friend of mine so I could determine if an experiment I was going to run would work or not. Perhaps here would be a place to ask.

I've a GReddy EGT gauge installed in my car right now. I just bought a PSI^3 S.E.C.S. to replace all the guages for a cleaner look. The PSI unit doesn't have an EGT sensor plug but reads the factory one. I was going to see if I could somehow make an adaptor to plug the GReddy EGT probe into the factory sensor harness. But ... I'm not an electrical engineer and have no idea if this would even work.

Of course option number two would to be to use a factor EGT sensor ... but I don't believe it was intended to be in the location (#3 cylinder) I have it in.
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Old 12-27-2004, 02:50 PM   #4
Mulder
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You can't replace the factory EGT probe with anything else as the readings will be different. Some of the aftermarket probes are thermocouples rather than thermistors, but in any case the calibration would be wrong.
I don't think you'd want to use a factory probe in the manifold location. It's only intended to be used in the uppipe where it's actually inside the uppipe cat. Exposing it to a full exhaust stream, either by gutting the uppipe or moving the probe to the manifold, will likely cause it to fail in short order. Also the temp readings from the manifold would be different than what the ECU expects from the uppipe.
If the PSI unit does not accomodate an external probe then you will just have to keep your existing gauge, or consider another unit that allows you to do what you want. The Ecutek Dashboard Display can accept external sensors-
http://www.ecutek.com/products/dashdisplay/

Last edited by Mulder; 12-27-2004 at 02:56 PM.
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Old 12-27-2004, 03:01 PM   #5
Twerthi
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Interesting. Thanks for the info, that helps a lot!
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