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Old 10-09-2012, 06:25 PM
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EGT probe placement question-

I know that most guys like to drill/tap the exhaust manifolds to put their egt probe in but, would it be bad or inacurate if I was to drill and weld on a nut on the 5" down pipe as close to the turbo as possible of course. Juz seems a easier route.
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Old 10-09-2012, 06:28 PM
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Putting the probe on the exhaust manifold will give you pre-turbo EGTs which is what most of us are after. Mounting the probe on the downpipe will give you post-turbo EGTs. Not sure how much of a difference their actually is, but I would be curious.
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Old 10-09-2012, 06:36 PM
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Usually a post turbo reading varies between 150*-300* lower than the manifold temps.
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Old 10-09-2012, 07:07 PM
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Temps of the exhaust will be MUCH higher pre-turbo as compared to post turbo due to the fact that energy contained in the exhaust is being expended to spin the turbine wheel and therefore results in a lower temperature after it has gone through the turbo. Hope this makes sense as it just isn't a distance thing.
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Old 10-10-2012, 06:23 PM
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on my truck it measured about 275-320 degree diff. pre and post turbo. Its flucuated fast when i tested it as you can see with the temp range.
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Old 10-11-2012, 06:29 AM
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Quote:
Originally Posted by 04cr450 View Post
on my truck it measured about 275-320 degree diff. pre and post turbo. Its flucuated fast when i tested it as you can see with the temp range.
im kinda at a loss for this also. i mean, i see Cat engines and Cummins engines constantly (road tractor) with the EGT probe in the downpipe about an inch and a half behind the Vband. if its good for them, why wont it work for ours. could i put it in my up pipe im about to replace when i do my EGR delete?
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Old 10-11-2012, 08:54 AM
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It works either way. One thing to remember here is that most road trucks aren't being turned up in hp ranges. They are designed to pull extremely heavy loads and not get the exhaust temps to hot. We put ours in the manifolds because this tells us what kind of temps are exiting the cylinders. A lot of us are also pushing higher hp levels than intended by ford or international when they built this engine. Personally I have 3 egt probes installed. One in each manifold and one post turbo about 6-8" down the down pipe. This allows me to watch all temps at any time.
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Old 10-11-2012, 10:06 AM
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Any tips for getting the probe(s) in without tons of disassembly?

Thanks.
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