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Old 07-08-2019, 09:17 PM   #1
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Pyrometer

Has anyone installed a EGT, better know as a pyrometer on their diesel motorhome? I have a 2002 journey 36

dl with a cat 3126e. I can find them but none I find have a long enough probe wire.

Thanks
Gary
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Old 07-08-2019, 09:31 PM   #2
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Originally Posted by G jeffers View Post
Has anyone installed a EGT, better know as a pyrometer on their diesel motorhome? I have a 2002 journey 36

dl with a cat 3126e. I can find them but none I find have a long enough probe wire.

Thanks
Gary
Have always used this brand. You can run any type of wire from engine box to gauge. Some coaches have extra wires from dash to engine room, I used them.
VEI Systems
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Old 07-09-2019, 04:03 AM   #3
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I used this one All Gauge Pyrometer Kits Diesel Engines

I got the round gauge and ordered the extra length of wire to be sure I had enough to get from engine to dash.
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Old 07-09-2019, 06:29 PM   #4
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I removed the Transmission Temp gauge and installed a pyrometer instead. They company had an extension cable that was long enough. I would hate to be without it. I was really surprised at how high the temperature will go on a long pull up some of the hills on our annual trip to AZ.
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Old 07-09-2019, 08:03 PM   #5
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Originally Posted by GreaTOne65 View Post
I removed the Transmission Temp gauge and installed a pyrometer instead. They company had an extension cable that was long enough. I would hate to be without it. I was really surprised at how high the temperature will go on a long pull up some of the hills on our annual trip to AZ.
I too was surprised by the EGT's, always thought the allison ecu would force a downshift, but at wot on a 4% grade noticed trans stayed in 6th and exhaust temp was sitting at 1400 f. I then shifted down manually to bring temps down. Probably not dangerous to have those temps for short periods. But pyro has taught me to not go wot without keeping an eye on exhaust temps.
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Old 07-10-2019, 04:22 AM   #6
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Is your pyro sensor installed before the turbo (in manifold) or located just after the turbo (in exhaust pipe)?
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Old 07-10-2019, 10:37 AM   #7
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Is your pyro sensor installed before the turbo (in manifold) or located just after the turbo (in exhaust pipe)?
My probe is in the exhaust manifold before turbo.
https://www.autotrucktoys.com/cdn/pd...structions.pdf
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Old 07-10-2019, 11:01 AM   #8
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My probe is in the exhaust manifold before turbo.
https://www.autotrucktoys.com/cdn/pd...structions.pdf
Just keep in mind that when the probe is before (upstream) of the turbo .. the probe can wear out and break off.. then goes directly into the turbo... bad boogie that..
I have melted a few, now only use the after turbo (down stream) install.. just mentally add 300 deg to the gauge readings.. if it breaks off will just head to the muffler.
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Old 07-10-2019, 11:13 AM   #9
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Mine is installed just after the turbo. There is a tapped fitting alrready provided in the outlet pipe.

I've heard many say that the pyro reading is more actuate of engine loading when mounting before the turbo - and many say that it doesn't matter because you are monitoring the gauge for those "out of normal operating range" readings not the actual temperature reading.

So once you know the "normal operating range of your engine", the actual numbers on the gauge are not what your looking at - meaning if normal range is 800 - 1000 degrees (measured after the Turbo) you start reducing engine load) when the gauge is starting to over 1000 degrees. Same as if the sensor was mounted before Turbo where normal readings are 1000 - 1400, then what you care about is when gauge is reading starts going over 1400.
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Old 07-10-2019, 12:05 PM   #10
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To each his own, but I will stick with Gale Banks recommendations. He has been modifying gas and diesel engines for 50 years and warranties everything he sells.
https://en.wikipedia.org/wiki/Gale_Banks_Engineering
https://www.autotrucktoys.com/cdn/pd...structions.pdf
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Old 07-10-2019, 01:48 PM   #11
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I installed the probe before the turbo. That is in my humble opinion the best place to mount it, if you want it to monitor the temperature, quickly and accurately. We had many farm tractors with the probes mounted there, and never, until mounting it in this Cat, did I ever see an engine register 1400 degrees. In all our tractors, when the temperature reached 1250, we changed gears, so you can imagine my surprise and horror to see 1400!!
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Old 07-10-2019, 02:37 PM   #12
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"Driving by the pyrometer"
https://official.bankspower.com/tech...-is-important/
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Old 07-10-2019, 04:43 PM   #13
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Thanks everyone for your input. I'm going to go with the kit Country B suggested.

Gary
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