egt probe location

[Onefaststang]

I have read time and time again that the egt probe in the manifold. Has anyone actually put it in the down pipe or y pipe to see the difference? Class 8 trucks always have them in the down pipe. Why are we different?

[majek5]

Difference of manifold to downpipe is 300-400*. Plus in the manifold you see the REAL temps going to the turbo. I had mine in the downpipe then switched to the manifold. The difference was night and day how fast it shot up when I hit the skinny pedal.

[seeemmiss]

Mine is in the down pipe and only get up to aroun 800* if I get in it. If the above holds water, the hottest mine gets is around 500*

[jerg_064]

I think the Y pipe would be just as good, it's an extension of the manifolds and is still pre-turbo......People have put post turbo before, seems to be much lower temps and don't give as good of an indicator as to how hot the cylinders are getting. Does seem to me though that if close to the turbine that it'd still be a good indicator of how hot the turbo wheel is.

I have to wonder if the 1250*F high mark for constant running came from the big rigs that run post turbo and if that got mixed up in the pickup world.

[jerg_064]

Originally Posted by seeemmiss

Mine is in the down pipe and only get up to aroun 800* if I get in it. If the above holds water, the hottest mine gets is around 500*

Got it backwards, 11-1200*.

[seeemmiss]

Shows what I know. I thought I read in another post that it was hotter after the turbo. Makes sense to be cooler. Can you tell I am new to this PSD stuff?

[majek5]

Originally Posted by seeemmiss

Shows what I know. I thought I read in another post that it was hotter after the turbo. Makes sense to be cooler. Can you tell I am new to this PSD stuff?

Sorry for the confusion. Temps in the manifold are 300-400* hotter than the downpipe. The first WOT run I did after I changed locations scared the $h!t out of me seeing how fast and how high the temps got.

[seeemmiss]

So if mine never get below say 400* after letting it idle a few minutes before shutdown, does that mean I may have problems? It is about six inches off the turbo on the down pipe and to get it under 500*, it has to sit for at least 2 minutes after normal driving. I know, I know, check ECT/EOT but the Sanguage is still in the mail.

[Lilpooh]

Originally Posted by seeemmiss

So if mine never get below say 400* after letting it idle a few minutes before shutdown, does that mean I may have problems? It is about six inches off the turbo on the down pipe and to get it under 500*, it has to sit for at least 2 minutes .

With or without A/C running. When my A/C is on, it takes a bit to drop down to 375*. No A/C it takes less than a minute.

[seeemmiss]

With A/C. I will try the without approach.