EGT Location??
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Posting Guru
Joined: Dec 2006
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From: Windsor, Colorado
EGT Location??
I was talking to my mechanic today about EGT location and he thinks it is a waste to put the probe pre turbo. He always puts his post turbo. His thinking is it gives you a collective reading of the whole motor that way. Just curious what the reasoning is for pre turbo as that is the way I installed it on my X.
Thanks
Thanks
Elder User
Joined: Mar 2007
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From: I'm there!
Originally Posted by santacruzf250
The concern is the temps going into the turbo.. Thus the pre-turbo thermo
My egt's are monitored both pre and post turbo (not downpipe but intake).
I tapped the intake Y to keep an eye on the real temp my engine is breathing.
For the record, after the intercooler, average temps are - 200 degrees.
As for mounting the probe in the downpipe... worthless.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
As for mounting the probe in the downpipe... worthless.
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by weekendwarriorfsw32
Iam a little confused. Where is the best place to tap in for the EGT probe
Thanks
Nick
Thanks
Nick
A primary reason for putting the EGT probe in either of these two locations vs the DP is response time. If you put your foot in it to start towing a steep grade, your post turbo EGT reading will have enough time lag that you might burn a piston before you realize it. The up-pipe or manifold location responds very quickly to increases in fuel.
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Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
There are some mis-use of terms here as well. EGTs have nothing to do with the intake. That's the AIT or MAT measurement (Air Intake Temp & Manifold Air Temp respectively). There are two choices for EGT -- post turbo and pre-turbo. Some after-market down-pipes come with a bung installed for an EGT sensor which is very tempting to use because it's so much easier. I wouldn't do that. It's not that big of deal to drill & tap the manifold or up-pipe, and keeping more accurate tabs on those temps at that point will save your pistons like already mentioned. People have been getting the misconception that EGTs are monitored because of the turbo, which as has already been mentioned is not the case. Aluminum pistions will melt in the combustion chamber way before any steel or alloy part of the turbo will further down the exhaust path, which was also mentioned already...
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Elder User
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From: I'm there!
Originally Posted by greedy737
pre turbo, pre turbo, pre turbooooooo!!! not post turboooo!!
Figured, why not put a guage on it.
For an accurate reading of 'exhaust gas temperature' you need to tap an up-pipe or exhaust manifold. I tapped both uppies, the temps are about 100 degrees different, left to right bank, left bank always hotter.
Analyze that Gene!
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by SolidGround
... For an accurate reading of 'exhaust gas temperature' you need to tap an up-pipe or exhaust manifold. I tapped both uppies, the temps are about 100 degrees different, left to right bank, left bank always hotter.
Analyze that Gene!
Analyze that Gene!
Does EGT give a false sense of security?
https://www.ford-trucks.com/forums/590447-does-egt-give-a-false-sense-of-security.html
... and your observation is why I recommended in that thread to never exceed 1100 F when towing a grade. You need to provide a safety margin to account for variations in fueling from the individual injectors. Unless you've an EGT probe in the passenger bank, you'll never know for sure how hot its running.