EGT/EGR - Diesel Forum - TheDieselStop.com
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 6 (permalink) Old 12-18-2018, 09:34 PM Thread Starter
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EGT/EGR

i have a 2015 F350 ultimat lariet SRW. I have installed an amzoil oil bypass, engine side coolant finter, and a set of air lift rear bags, centromatic balancers, and have a SCT GTX tuner. I have installed the EGT probe in the engine pipe in the engine valley where recommended. I see readings on my egt that sometimes are in the 800-1000 like expected, although in the cold weather i don't see as high of temps, does anyone know what temps the egr will open to allow more to the turbo ? or is it that the air is so cool coming out of the intercooler that the EGT is so much lower. Or maybe i have this all wrong.
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post #2 of 6 (permalink) Old 12-19-2018, 07:20 AM
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Intercooler temps are at best only 25*+ over Outside Air Temperature. So if it's 30*F outside...Yours might be as low as 55*F. Consider the Secondary Coolant circuit is operating at like 130*F or something like that.

Since you are running stock with the GTX I'm surprised you cannot see the OEM sensors that will answer your questions. My Insight with recent updates will show you the EGR outlet temps (EGT Post Cooler Temp).

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post #3 of 6 (permalink) Old 12-19-2018, 08:14 AM
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Originally Posted by Kevin Wansor View Post
I see readings on my egt that sometimes are in the 800-1000 like expected, although in the cold weather i don't see as high of temps, does anyone know what temps the egr will open to allow more to the turbo ? or is it that the air is so cool coming out of the intercooler that the EGT is so much lower. Or maybe i have this all wrong.

Not sure what you are hoping to determine and I suspect that you have some misconceptions. The very purpose of "EGR" is to lower peak combustion temperature where NOx emissions are formed in the cylinders. This is accomplished by introducing some inert gasses (exhaust) back into the intake by opening the EGR valve. You might see lower EGT's as a result but I doubt this is the reason for your observation. I would probably attribute the lower ambient air temperatures affecting the engine physically and the cold air entering the engine causing different fuel rates... which do affect combustion temps. The intercooler on a Ford 6.7L PSD is air to coolant therefore probably not a factor at all. And one other thing - opening the EGR valve takes exhaust away from the turbocharger. Things get a little complex from there... But FWIW I am not an engineer or a "tuner."


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post #4 of 6 (permalink) Old 12-20-2018, 07:04 AM Thread Starter
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Intercooler temps are at best only 25*+ over Outside Air Temperature. So if it's 30*F outside...Yours might be as low as 55*F. Consider the Secondary Coolant circuit is operating at like 130*F or something like that.

Since you are running stock with the GTX I'm surprised you cannot see the OEM sensors that will answer your questions. My Insight with recent updates will show you the EGR outlet temps (EGT Post Cooler Temp).
I am not looking for anything special, I have the EGT probe because I do tow a 35’ 5th wheel, i don’t run stock tunes. I was looking to find out if anyone ever noticed low EGT temps when it was cold out. It seems like once the engine is warm I see higher temps but that is after coolant temps get 130-150, then it seems to be a steady 400+ EGT temp with truck in gear at idle. In my previous truck 2004 5.9 Cummings there was none of the extra coolers emissions DEF and maze of tubes hoses that go with it.
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post #5 of 6 (permalink) Old 12-20-2018, 08:16 AM
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There is no G in Cummins

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post #6 of 6 (permalink) Old 12-20-2018, 12:33 PM
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There is no G in Cummins


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