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Old 03-09-2013, 10:42 PM   #1
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Egt gauge and primer pump mods

Today I did some more work on my Rv, egt gauge and a primer pump for the fuel system, the pump I must say its nice and it makes fuel filters changing a lot easier and no mess, the gauge still not finished. What do you guys think of the spot where I put the probe the gauge?

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Old 03-10-2013, 05:24 PM   #2
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For a EGT reading that has any meaning the probe should be pre-turbo.

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Old 03-10-2013, 06:27 PM   #3
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Post turbo will generally be about 300 degrees cooler than pre turbo.
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Old 03-10-2013, 06:34 PM   #4
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Any post turbo temperature reduction numbers are just a guess.
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Old 03-10-2013, 06:45 PM   #5
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Yes, post turbo could be considered a guess but if you run internet searches there seems to be strong agreement 300 to 350 is a good number for the difference between pre and post turbo.
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Old 03-10-2013, 06:51 PM   #6
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And EGT probes placed any distant from the cylinder/s is not accurate.
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Old 03-10-2013, 07:14 PM   #7
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But if you look at a cat engine with egt gauge from factory they all have it after the turbo, and another reason I did it after because I feel like at the manifold the reading was going to be based on one cylinder, I know they should all run the same but I chose to to do it after turbo. Doesn't mean that I'm correct.
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Old 03-10-2013, 07:38 PM   #8
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Its your engine, do it anyway that yanks your crank.
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Old 03-10-2013, 07:45 PM   #9
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Just sent request to my Cat contacts lets see what they say.
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Old 03-11-2013, 10:49 AM   #10
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Cat does not use a exhaust pyrometer input to the ECM.
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Old 03-11-2013, 03:58 PM   #11
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Quote:
Originally Posted by jauguston View Post
Cat does not use a exhaust pyrometer input to the ECM.
I never said that cat uses a pyrometer input to the ECM, I did say that the cat engines that have a pyrometer from factory with a gauge in the dash the probe is after turbo.
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Old 03-11-2013, 05:09 PM   #12
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I must have misunderstood what you were trying to say. Cat does not install pyrometers. If you are refering to pyrometers installed in a motorhome it would have been installed by the chassis builder just like all the other gauges not Cat.

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Old 03-11-2013, 07:32 PM   #13
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I'm not saying cat engines on motor homes there are cat engines in trucks like a friend of mine as a c15 engine with a pyrometer and it is after the turbo, and that came from the dealer with it, maybe it was put in by peterbilt but what ever it was they can't be so wrong putting them in the wrong spot and those engines are pushed to the absolutly extreme very often, and not to mention the probe is about 12" after the turbo on the downpipe. Joe
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Old 03-11-2013, 07:44 PM   #14
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Good job.

I agree with others that you want it before the turbo preferably close to the flange(to be perfect), but the thing here is for you to see when something goes wrong. So if you get your baseline temp then this is what you compare it to. You will see when something goes wrong either way.
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