Engine/Transmission (1994 - 1998) Pre-turbo EGT or Post-turbo EGT???

[CogginsP]

I have found myself in a pretty large predicament here. The diesel mech who picked my truck out for me (girlfriend's father) knows the Dodge Cummins inside and out, very very knowledgable person when it comes to ALL things diesel, and he swears by post-turbo EGT. When I asked him he told me to definetely install it post-turbo. It seems like almost EVERYONE on the boards here swears by pre-turbo EGT. I am being yanked in two completely different directions.



My opinion is that the exhaust gasses coming straight out of the engine would be the most accurate way to measure it, vice the air that is passing through the turbo. Could I get some pros & cons please???



Appreciate the help as always!!



Phil

 

[pwknapp]

Dump the girlfriend, the father goes away, and you have accurate pre turbo temps. :-laf

 

[JoeBioDiesel]

A lot of diesel techs that swear by post turbo EGT probes, do so for a reason. Any item that is installed upstream from the turbo increses the chances of damaging the turbo. If the probe starts to flake peices off (which can happen) it will spit those flakes into the turbo, and can possible damage it. The chances of that happening are much slimmer than damaging the engine from less accurate EGT readings. Remember, you're bombing the engine. When you do that, you already risk damaging it. Minimize the chances and go with a pre-turbo EGT.



Joe

 

[coyote75]

I just recently moved my probe form post to pre. My truck is mildly bombed, but I didn't notice a huge difference in similar towing and driving conditions. It does make me feel a little better, knowing how hot it is in the manifold. Just my $. 02 worth.

 

[pwerwagn]

Definitley pre!!! I moved my thermocouple from post to pre a long time back. It makes a huge difference in readings. In the post position, I would never exceed 1100*. Egts werent a big concern.

Then I moved it, and EGT's would go to 1500* really, really easy. I saw much more than 300* diff between the two, closer to like 600* or so in my case.



The only thing is, the shut down temps are more accurate post turbo. I can get it to cool down to 300* easy now, where before It would take a while. So I know now to let it cool down longer, or at least until it is dropping pretty quick.



--Jeff

 

[RMcKinney]

Hi,

This can be a subject with a lot of speculation so here is my though for what it is worth.

Per Turbo is telling you what is going to happen.

Aft turbo is what has happened.

I thought the EGT Gauge is to prevent damage and to prevent you have to know the before.

Rex McKinney 95 2500 Pre turbo

 

[DBrickel]

be politically correct and do both I think you get a more accurate reading of whats going on installing pre turbo. Has anyone here had a pyro probe sucked into the engine? I can't recall anyone mentioning it here. Could be wrong though. Never been wrong before

 

[telliott]

well its not going to get sucked into the engine because its in the exhaust manifold. it could however go through the turbo on the exhuast side. although i have never known anyone that this has happened too, i've just always heard its possible.

 

[KingS]

go post just because, plus if you ever bomb it hard and don't want to sit and watch the temp guage to see if its safe to turn off the key, and decide to buy a turbo timer to shut it off for you the manufacture recomend post so get a accurate reading so the timer shut the truck down at right temp. just my . 01

 

[Jetpilot]

If you are worried about your turbo go post... . If you are concerned about your engine go pre!



Doug Smith