New 2012 CRD with Bully Dog, what is max EGT?

[DiamondDiver]

I just replaced my 05 dually with a new 2500. I'm using my BD triple Dog tuner as a monitor so I don't void the engine warranty. I can monitor coolant temp, transmission temp, boost and EGT(Pyro1). It also displays what gear I'm in and I can use the driving coach to maximize fuel econ.



My question is, on the 2012 CRD, where is the pyrometer located in the exhaust, and what is the max allowable EGT for this probe?



Thanks

 

[HBarlow]

If your question is where should the pyro be located it is your choice. The three trucks I used a pyro on have all been drilled and tapped into the center of the exhaust manifold on a horizontal plane. Most owners do something similar.

Max egt will be what it is. Cummins designed the engine to run at full throttle, full load, all day, day after day without harm so egt won't go beyond what Cummins engineers considered safe in an unmolested engine.

Install your pyro and then load the truck heavy and pull a long grade with your foot deep in the accelerator pedal. Max egt reading will will tell you what it was designed to do. My guess is it will be around 1400°.

 

[DiamondDiver]

Pyro1 reading on Bully Dog

Actually, the BD is reading an input for pyro1 and pyro2. There is a tube that runs from the exhaust manifold to a sensor on the front of the engine that might be a pyrometer, but I can't find a second sensor and I'm not sure the sensor I located is a pyrometer.



Is anyone familiar with the 2012 CRD sensor layout?



Without a tow at 80 mph pyro1 was reading around 850 F on level ground with an ambient temp of 81 F.



The EGT seems reasonable and tracked up and down with varying load, but I still don't know if it is an actual pyrometer reading or a value calculated by the ECM. I think it is an actual pyrometer reading and it would be nice if someone who might know could verify this.



Thanks

 

[Hoefler]

I believe they are mounted one before and one after the DPF.

 

[DiamondDiver]

Thanks, That makes sense as temp differential across the DPF would be a good way to monitor the soot loading. Currently they read the same, I'll watch the readings and see if they diverge as the DPF loads up with soot.

Pressure diff might be better, but I suspect pyros are cheaper than pressure senors.

 

[Bob V]

Those pyros really are only for emissions and are in the wrong locations for anything else. You could see 1400 and it means nothing, just the PDF clean out cycle.

 

[AH64ID]

As stated those are pyro's for the DPF and the number doesn't always correlate to manifold temps based on regen status.

Since your stock the max safe level is whatever it reads at it's highest point. It will be higher than you expect, but normal.

 

[DiamondDiver]

Thanks for the replies.

Even though it's not on the manifold and it won't be relevant during regen cycles I still find this reading useful. Although I would prefer a pyro in the manifold , before the turbo, the pyro in the DPF should indicate problems with an injector or turbo before the CEL comes on if I am familiar with how it normally reads.

There are only 4 fields on the BD, I watch Trans Temp, Turbo Boost, Pyro1, and Fuel Usage (gal/hr). The BD is limited, but I already had one because my old truck needed to run a modified tune. I was happy with it on my 2005 Dodge 3500, and I like the data I can monitor on my 2012. BD has a gage monitor available that is much cheaper, and another monitor with a larger screen that has more features, but I'm happy with the Triple Dog.

I also have another OBDII reader that displays on an iPad or iPhone over wifi, but it's too cluttered to use while driving.

Thanks again for your help