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Old 05-11-2004, 11:09 AM   #1
maxiav
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Default EGT Probe in Turbo cars

Why does Autometer recommend installing the EGT probe 1-2 inches from the turbo inlet and 1-2 inches from the headers for NA cars?....

Why the difference?.
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Old 05-11-2004, 02:39 PM   #2
Pi7467mp
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this is where all of the exhaust gases "come together". You will have the most accurate readings if you put it in this location. If you put it too close to the headers the exhaust doesn't have time to mix and you might get a false reading due to the egt picking up only one of the header exhaust stream. does that make sense?
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Old 05-11-2004, 03:39 PM   #3
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makes sense, but at the same time, it makes more sense to have it closer to the headers....

anybody else????
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Old 05-11-2004, 04:05 PM   #4
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how does it make sense if this is true?

If you put it too close to the headers the exhaust doesn't have time to mix and you might get a false reading due to the egt picking up only one of the header exhaust stream

Goober
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Old 05-11-2004, 10:15 PM   #5
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People put it near the #3 cylinder because that one runs the hottest. The other cylinders run cooler than that so if you put it in the #3 runner you will be safest.
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Old 05-11-2004, 10:21 PM   #6
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Quote:
Originally posted by Drac9
People put it near the #3 cylinder because that one runs the hottest. The other cylinders run cooler than that so if you put it in the #3 runner you will be safest.

That is the conventional wisdom, but most people seem to melt #4 piston when they go...
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Old 05-11-2004, 10:58 PM   #7
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number 4 it is then
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Old 05-12-2004, 12:06 AM   #8
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or you could do the parallel fuel rail mod, and put it where it is supposed to go.. or you could spend about 1000 and get an egt computer that tells you what the egt is for each cylinder., this way you know exactly what is going on in the motor..
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Old 05-13-2004, 05:18 PM   #9
maxiav
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k.... now Im confused.....
3....?
4..???

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Old 05-13-2004, 05:36 PM   #10
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If you do the parallel mod, put it in 3
if you keep the fuel lines stock, 4
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Old 05-13-2004, 07:19 PM   #11
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i second that
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Old 05-14-2004, 08:17 AM   #12
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I did man by number 4...just about 3 inches down stream...
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Old 05-14-2004, 09:32 AM   #13
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Thanks! I tried drilling yesterday without taking the headers off.... .... that never happened. Guess Im gonna have to go to a midas or something.
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Old 05-14-2004, 09:46 AM   #14
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take the piece to a machine shop, i dont know much but i do know i would NOT drill+tap w/ it on the car too many options for problems, theres no way ur gonna be able to clean it that well so just pull it, drill+tap and pour like paint thinner all over it to get some of the dust out or brake cleaner
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Old 05-14-2004, 01:30 PM   #15
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Going to a midas tomorrow. Car is not turboed yet so I'll just let the pieces fly through the exhaust.

Thanks for the help #4 it is
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