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02-27-2006, 01:55 PM | #1 |
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Stock EGT sensor...same as aftermarket???
I haven't been able to find an answer to this questions and need to know soon as I am changing my gauges out to a new unit.
Currently I have an EGT tapped in the manifold for #4. The unit I am getting will read EGT, but only from the ECU at this point. I have removed a ton of UP's before and obviously know there is an EGT sensor there that the ECU uses, but do not know if it is the same as my aftermarket sensor. My aftermarket sensor is a standard two wire k type sensor. I know the stock sensor is also a two wire sensor, but do not know if it is the same type (I assume it is). I already have the EGT from the UP removed and have a resistor in the plug. I am wondering if I can take the two wires from my aftermarket sensor and splice them into the stock plug to allow the ECU to read EGT from my manifold instead of UP? I also know that the ECU will be unhappy when EGT's get too high when read on the Up sensor, but do not know what that limit is. I am concerned with this limit as I know the readings will be a bit higher with the sensor being int he manifold instead of in the Up although I have seen that the difference is not extreme. Any help would be appreicated. Tony
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02-27-2006, 02:13 PM | #2 |
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The stock EGT is a thermistor and only used by the ECU to detect that the uppipe cat is working, and works more or less like a on/off switch. If the uppipe cat gets too hot then the ECU goes into limp home mode. So you can't use the uppipe EGT as a proper temperature EGT like your aftermarket one, and you can't use the aftermarket one with the stock ECU as it won't work as it's resistance and type is different.
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02-27-2006, 02:15 PM | #3 |
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What is the level at which it will go into limp mode? Do you know of a way to convert the signal of the K type to stock sensor?
Edit: I should also mention that this is for a Psi3 unit I will be using. Last edited by subieworx; 02-27-2006 at 02:24 PM. |
02-27-2006, 02:27 PM | #4 |
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Sorry no idea on the conversion, probably not possible, the temp ceiling i'm not sure either, maybe someone else knows this?
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02-27-2006, 02:34 PM | #5 |
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Vehicle:2002 WRX WRB |
This thread is also a good read
http://forums.nasioc.com/forums/show...gt+temperature Lots of technical info there on temps. I'd say if temps reached 1600 then the ECU would complain to save the exhaust valves, uppipe CAT and hot side of the turbo. I'll keep on digging. |
02-27-2006, 02:42 PM | #6 |
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I thought the ECU started to complain before that which is what I'm concerned with. If I do find a way to make my aftermarket sensor work I know it is going to see higher temps than the stock sensor would.
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