Egt

[REC]

Being relatively new to towing with a diesel, I have a question about my EGT. Going up a long grade, if I take it out of overdrive, the amount of pedal required to mantain speed is resuced, but my EGT increases. put it back in overdrive and the temps go down. Is this normal?

 

[HBarlow]

My Cummins reacts in a similar way. If EGT rises too high ascending a steep grade in overdrive, a downshift doesn't help much. If I use sufficient throttle after the downshift to maintain desired roadspeed EGT will return to a similar level. I can avoid excessive EGT on a very steep grade by slightly reducing throttle input. My truck has a 3. 54:1 ring and pinion. Trucks with 4. 10 gears have a little more torque multiplication and may do better.



Harvey

 

[FDziurda]

If I understand what you are saying, mine works opposite of yours.



If I am pulling a grade with my trailer in 6th gear, I have to watch the EGTs. I don't run out of power, but the EGTs climb steadily. When/If I hit 1200 degs, I downshift to 5th and the RPMs increase, lowering the EGTs. I have not found any hills that have caused the EGTs to rise to 1200 degs while in 5th gear, maintaining 60 MPH. I pull a 27' travel trailer which weighs around 7K. Total truck & trailer run around 16K when I am fully loaded. This is "light" compared to what many folks are towing.



Frank

 

[RAMINSPEED]

As boost goes up, temps should drop. Tighten all your intake clamps and check for boost leaks.

 

[cwsoules]

I too watch my EGT. Towing in OD when the temp reaches 1250, I disengage cruise control and back off to 1200. If the truck continues to slow due to the steepness of the hill, I will shift down to 3rd. The EGT for the same speed will increase as the engine is working harder to make that speed. I then slow to keep EGT at or below 1200. I tow a 10K 5er.

 

[rblomquist]

I don't get it. My experience is the closer the engine gets to lugging the more the egts go up. When I start to bog down some while towing the EGTs will start to rise; then I take it out of OD, the rpms go up, boost goes up, the bog/lug is eliminated = the egts down immediately. Seems like the more fuel you're not able to efficently burn i. e. lug condition the higher the egts go up.



Edit (addition): What I do get with lower gear-higher rpm is increased engine temp and slightly increased trans temp (make sense to me) but not higher egts. I agree with the above that higher boost should = lower egt.



I tow a camper that has weighed as much as 11,500lbs (weighed on a scale)