I installed my guages today and I put the EGT probe post turbo in the Jake brake housing (there is a hole there already just take out the plug and your good to go). Does anyone know what kind of temp I can expect to see in this location? I have heard it is about 200 to 300 degrees less than pre turbo. If that is so what should the temp reading be, before I can shut the engine off?
I know it is not the best place I did not want to drill the manifold just yet the truck only has 1900 miles on it.


Puller

 

Just tapped mine last weekend with less miles

 

I installed mine post also in the elbow after the turbo.. I believe the same spot the jake goes. Anyway I see about 900 deg normal with about 1100 deg getting pretty hot!! I have seen as much as 1300 when I popped my intercooler and was running basically with no boost and just fuel. Havent had a heat related problem yet... 58k and rolling.

 

Aftrer some testing I took it out for a spin last night and the EGT were reading between 500 and 600 degrees at 65 mph when I stop and let it idle the temp drops to 300. Does this really mean that the temp is 600 pre turbo?


Puller

 

I also have my probe post turbo and 600 degrees running down the highway seems about right.

When I park I let it cool to 400 degrees, because it seems to take about 4 minutes of idleing to gt to 300....don't have a clue as to why..

Anyway, as I understand it from Cummins (I emailed them several months ago), they recommend the post turbo install of the probe. At idle, 400 degrees is probably about the same for a pre-turbo probe. When running (especially towing) the difference becomes geometrical.....not linear.

So that 700 degrees post turbo might be 865 degrees preturbo, while 1000 post toube might equate to 1300 preturbo.

I simply make sure I don't go over 1150 degrees on my egt gauge...if it gets close (only happened one time) I take my foot out of it and it cools down almost immediately....works for me

 

Zog

Thanks for the input. I just don't want to screw anything up, the truck and everything else cost too much.

Puller

 

This has been discussed several times. The most common thought is you want to wait until the truck cools down to about 300 degrees - post OR pre turbo probe - before shutting it down. You're right - that last 50 to 100 degrees seems to take FOREVER to drop.

Try this - rev the engine to about 1200 or 1300 rpms and let it sit there for about 30 - 45 seconds. Release the pedal and the gauge should read 300 degress or so - mine is usually less than that after doing this. It sure beats sitting in the truck for 4 or more minutes...