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post #1 of 13 (permalink) Old 03-01-2014, 10:15 AM Thread Starter
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EGT sensor placement

I've read that the most accurate, and important, EGTs to monitor are between the manifolds and the turbo. Since I'll have the turbo off anyway, I figured I would go ahead and put it in there. Normally I would be afraid of leaving bits of metal in the pipe and risk them getting pushed into the turbo, but with the y-pipe off I can just vacuum them out.

What I need to know is if there is an optimum placement for the sensor. I would assume after the two pipes "y" into one, but how close to the turbo should it be?
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post #2 of 13 (permalink) Old 03-01-2014, 11:36 AM
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Re: EGT sensor placement

Driver side exhaust manifold just before it bends to go into the uppipe-ypipe

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post #3 of 13 (permalink) Old 03-05-2014, 03:47 AM Thread Starter
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Re: EGT sensor placement

Ok, why there? I've been looking around and have seen recommendations for drivers side before the Y, passenger side before the Y, after the Y....but no one really seems to be able to articulate WHY each position is the best. I would think, educated guess really, that after the Y would be best as it measures a composite of both sides. If I put it on the passenger side but the drivers side is 200 degrees hotter, I will still only see the cooler temp. But, if I put it after the Y, at least I would see a rise in temp due to the hotter exhaust from one side mixing with the cooler exhaust from the other.
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post #4 of 13 (permalink) Old 03-05-2014, 01:14 PM
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Re: EGT sensor placement

Driver side is USUALLY the hottest and of course cylinder #8 has the hottest gases flowing beside it. Also, the gas can cool slightly before the y pipe. The temp isn't going to double when they mix. It will stay the same.

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post #5 of 13 (permalink) Old 03-06-2014, 10:47 AM Thread Starter
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Re: EGT sensor placement

I know it won't double, was just thinking that if left side was 700 degrees and right side was 600 degrees, after the Y would see 650 degrees....given equal volumes of exhaust gasses of course.

Why do you say #8 has the hottest gases flowing past it?
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post #6 of 13 (permalink) Old 03-06-2014, 10:55 AM
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Re: EGT sensor placement

Its the last on the bank.

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post #7 of 13 (permalink) Old 03-06-2014, 11:00 AM Thread Starter
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Re: EGT sensor placement

I would agree that it has more flow past it since 2, 4, 6 go past it, but hottest? By your reasoning wouldn't #7 also be hottest since it's last on it's bank? (ignoring the EGR of course) And if so, what would it matter if both sides therefore had the hottest gasses....they would be equal.
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post #8 of 13 (permalink) Old 03-06-2014, 03:05 PM
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Re: EGT sensor placement

Since you seem to know all about it, why did you ask?
Also, cylinder #8 is last to get coolant, so temps could be slightly higher.

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post #9 of 13 (permalink) Old 03-07-2014, 09:41 AM Thread Starter
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Re: EGT sensor placement

No need to be snide/sarcastic. I'm knowledgeable with gassers but relatively new to diesels, and so I'm trying to educate myself. I'm good with theory, but don't have the practical knowledge, which is why I asked. My comment was based on theory, but was wondering if I was missing something from the practical side of the coin....such as #8 getting coolant last. I don't imagine it would make a huge difference in exhaust temps on that cylinder, but it would definitely make a difference. That's the kind of stuff I'm looking for. Thank you.
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post #10 of 13 (permalink) Old 03-07-2014, 10:39 AM
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Re: EGT sensor placement

The most accurate readings are closest to the manifold. If you are concerned a out one side hotter than the other, install 2 gauges. LH/RH.

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