can someone explain egt.... i now its the exhaust temp but thats about it... want to know whats a bad temp, and how high temps are created like too much fuel or whatever... examples if able... i'm new the the diesel thing and just trying to prevent from messing things up... thanks for you'lls time...

 

ok...well i say that over 1300* is bad!!! others will chime in with their thoughts as well also. but these temps sustained for a period of time will do some damage. lets say you have and this is entirely just an example... an edge juice module with 150hp injectors and a stock exhaust and or intake and turbo. you turn the juice up to level 5 and your temps will go thru the roof. you have too much fuel and not enough airflow. getting the right mix is key. now you upgrade your turbo with an 4 or 5" exhaust and your egt's will lower because you are getting better airflow to cool the hight heat of all the fuel being burned. there are also other ways to add a cooler flow of air and that would be a water/methanol injection kit. but first things first...have a set of gauges so you know that you are keeping your engine in check! cant stress it enough on here

 

thanks man ill put that to use!!!!

 

Cummins recommendation is 1250 degrees working limit. That is the maximum temp that their turbochargers will operate(for an extended period of time ) at and not be damaged.

Temps above that limit won't hurt anything as long as the duration is short. Naturally the higher the temp the quicker it will be damaged. For the 15-20 seconds you would normally be under full power(drag Strip, Sled Pull or just a WOT run) Anything under 1700 would probably be acceptable.


I know some sled pullers run in the range of 2000 degrees when they are pulling. I personally wouldn't try it though.

 

cool thanks for the input!!!!

 

There are several ways to get high EGT's:
a) you are running out of air because of altitude or you might have a compressor problem.
b) your fuel system is overfuelling

Operating your engine with EGT's consistently above normal accelerates system wear, particularly the turbocharger.
The higher the EGT, the sooner you will have to pay the bill.

That means in return if you towing up a long grade hill and you are still at full powerand your EGT's before the turbine are below the magical 1250° before(!) the turbine your engine is working properly- just have in mind that a probe behind the tubine shows 200 to 300 degree lower values.

c) wrong injection timing this is another reason for high EGT's. Injecting to early and your temps will raise. But this won't happen to a power enthusiastic bomber, right?

 

thanks man.... any ways to help cool the temp down.....

 

Yes, I guess you want to keep the hp so you have to upgrade your turbo or at least the compressor side.
It is also possible to get a compressor wheel which has more blades(race tech).

A bigger Intercooler can help too- every degree you can cool down the intake temperature equals in the same amount in a lower exhaust temp. e.g.: 120°F drop in the intake equals a drop of 120°F in the exhaust.
In the end you will sum up all countermeasures to fight against high EGT's.

A safe and reliable bomb is a upgraded turbo in combination with a good intecooler.
You have to look at your truck you might find ways to increase airflow trough the intercooler. Think about airducting. Factory design is barely optimum.
You also could use Waterinjection to lower EGT's temporarily. I don't like that way. It is a bad fix of a known state.

 

i really appericate all the help.... now its just a matter of putting all the info to use... thanks again!!!