My '08 6.4 diesel would routinely run at 1300-1380 pulling uphill but not for a long period of time, usually would settle in the mid 1200's after the initial downshift.

 

On stock tuning?

 

Yes, and no problems. Engine was great, solid performer. But I do want to make it clear that the above 1300 was only for 10 seconds or less when it would downshift from 5th to 3rd for climbing a grade. Prolonged hill climbing would settle into 1250 or so.

 

I would like to put a pyrometer on my new truck. After 5 days of ownership I miss the one I had on my 2000. Has anyone found whether EGT is reported to the OBDII port ????

 

I have the 6.4, same everything as Joel. My hardest pull was probably about 2.5 miles up 6-7% grade in 105F temps. Even then 1350 or so was all the EGT's I got. That was with a combined wt of around 24K. In stock form.

Truck did not defuel but about 55 mph is all I could get out of it. Limit is closer to 1400F.

 

It certainly is, as it has been ever since the '08 6.4L trucks. You just have to find a gauge that is set up to read the values.

As of right now I'm not aware of an electronic gauge that's available for the new 6.7L engine yet. I'm sure the Edge Insight will be capable of doing it once it's available for the 2011 trucks.

 

Thanks for the info, I guess I will start looking....

 

Found this on Diesel Stop:

The thermocouples are not in the right place to use for driving your truck. They are not only post turbo, they are way down there where the temps would be useless info.

The purpose of the factory thermocouples is to control exhaust gas recirculation (EGR), diesel particulate filter (DPF) regeneration, and use of diesel engine fluid (DEF). Those thermocouples won't tell you anything about pre-turbo exhaust gas temp (EGT), which you need to know to save your pistons from meltdown.

For driving your truck, especially when towing a heavy trailer up a mouintain pass, you still need an aftermarket pyrometer with the thermocouple mounted before the turbo (pre-turbo).

If this is true then I guess I will Have to have a separate Pyrometer installed RATS

 

It looks to be true, but why do you really need to see the pre-turbo EGTs?

First of all, remember that the exhaust system contains insulated components in order to aid passive regen in the DPF. Meaning that the exhaust gasses are kept as hot as possible all the way to the DPF; I seriously doubt there will be a huge temperature loss between the turbo and the first EGT probe.

Secondly, the engine calibrations are set with thousands of variables in mind, and I'm very confident that EGTs were in mind when considering WOT fuel programming. Remember that there isn't any real variable between the cylinder heads and the first EGT sensor, therefore the temperature drop should be a relatively predictable. Because of that, if the PCM knows how hot the gases are at the first probe, it knows exactly how hot things are coming out of the heads. And with a $15K repair bill as insurance, you can be sure that the PCM will keep them at a safe level.

You can pull the biggest trailer you can imagine up the nastiest mountain grade in the nation at WOT all day long and you should NEVER get this engine hot enough to damage anything. It's that smart and the cooling package is that good.

Another thing to remember is that the exhaust manifolds are subject to huge stresses as they expand and contract through the ~1,400° operating range. In my opinion drilling and tapping them simply to say that you know how hot things are at that point when you have perfectly good probes a bit farther down the line is borderline insanity.

Your truck is designed to pull heavy things at speed across steep hills. If you're like me you like to see as much operating data as possible. But there is a point where using what's available makes sense and to go farther just doesn't make sense. This is one of those things.

 

I hear what you are saying and I know that sound paranoid but I would like to see the temp. When I put the gauges on my 2000 I found I was running well over 1200 degrees at times and that was red line for the 7.3. Changed to a 4" exhaust and rarely did they go above 1000 degrees.

 

I think Banks IQ is out in stand alone form now. You could get something like that and see what those temps are.

I tend to agree with Tom. In stock form there is just no way this motor will burn up the pistons.

On the other hand, if you tune then you will need to know.

 

I was told 1200 degrees was red line. I had my gauges way before I chipped my 2000 and my temps did rise above 1200. I finally put a 4" exhaust on and the temps finally stayed below 1200. I'm just saying I worry, right or wrong, I worry.