EGT`s

[TJMIV]

Wanting to know what you normally see cruising, & when you put the hammer down? Relatively flat ground no load 70 to75 mph I see high 300 to low 500. If I get on it hard no load I see 1050 to 1200, is that normal ? I thought I remember reading an article by Joe Donelly about this on different generation trucks & how much difference there was between these trucks. I guess what I`am really after is what will a 3rd gen truck stand on a regular basis without anything melting. I purchased an edge insight to monitor these things & also have a ( smarty jr. not installed yet) but don`t want to do anything dumb. Almost forgot EGT probe installed before turbo where #5&#6 drops into turbo. Thanks for any useable info.

 

[cerberusiam]

Cummins has rated the newer engines at 1450 degrees pre-turbo sustained. If you want to see your max EGT's lockout OD and run it to the rev limiter.

 

[TJMIV]

Thanks for the input cerberusiam , but I don`t no if I can make myself hold the go pedal dowm until that happens. I tried to get this info on another site & they kept saying no more than 1200 degrees for a short period of time. I did`nt think that sounded right , but was not sure. I`ll look back through my TDR issues cause I`am pretty sure I saw that article in one of them.

 

[CToney]

I run my trucks to ~1250 max. That is conservative from what I read here. The stock egts are higher than that. With the Smarty Jr you will have a hard time to reach 1250. On tow I could barely get the needle to go past 1200. On the perf setting 1250 is attainable. You will like the way the JR runs. Enjoy.

 

[Jakester]

Does any one have EGT data for after turbo or any data on heat loss in turbo? 2005 stock 5. 9 HPCR. Jakester

 

[Tinman]

I thought the newer trucks where 1450 peak and 1350 sustained??

 

[HBarlow]

Cerberusiam answered your question completely and accurately. That is the same info that was provided to me by an engineer at Cummins several years ago. That number was developed during extensive product testing using instruments to record engine operation.

Keep in mind that these engines are also installed in medium duty trucks such as Freightliners and Ford F-650/750 and rated to pull up to 60,000# gross combined weight.

All you really need to know is that as long as your engine remains stock as built by Cummins and you keep the fluids and filters changed as required you cannot hurt it with use of your right foot. Many of us like having gauges to monitor what is going on but they are not needed as long as your engine is factory stock. We don't really need to know what the egt is, the ECM won't overfuel or overheat it.

 

[HBarlow]

Here is the text of the private message I received via the TDR website several years ago. I have deleted the engineer's name to protect his identify. I had pm'd him inquiring about the maximum allowable sustained exhaust gas temperature the HPCR engines could tolerate.

"Harvey,

Happy holidays! EGT's are always a touchy subject due to differences in measurement locations and differences in the devices used. It's difficult to say what a true upper limit is on EGT for the ISB engine because we don't test it above the "stock" settings. However, I can tell you what we have measured on the latest 2004. 5 and 2005 engine configurations.

MY04. 5/ 325 exhaust temps can be as high as:

Sea Level: 1375 Deg F pre turbo, 1125 Deg F after turbo.
Altitude: 1450 Deg F Pre turbo, 1200 Deg F After turbo.

The above are typical temperatures from development trips. The MY04. 5 product was developed to operate at these temperatures. I have no idea what would happen at temps above these, because they haven't been tested.

I don't mind you sharing these numbers as long as the source remains anonymous. We don't want someone thinking "Cummins approves this temp on my engine because . . . " . This really isn't a guideline or approval or anything, just some results from tests we've conducted on stock engines.

I hope this help answer you question. If you need anything else, let me know!"

 

[Turbo_Bob]

I get around 400 to 500 F unloaded at freeway speeds and 1,000 F at speeds pulling a 26 ft 10,000 + pound toyhauler. While pulling the toyhauler up a 6% grade at altitude in 5th gear it is 1,200 and will peak up to 1,300 F if I push it, 25 PSI boost.



Probe before turbo, open exhaust.