Engine/Transmission (1998.5 - 2002) High EGT's while towing?

[JMalliet]

I got to tow my wheelin rig (1 ton Dakota truggy weighing 4,760lbs) a week ago on a single car hauler weighing 1,200 lbs. The truck is an '01. 5 HO 4x4 on 35's with 3. 55 gears. Mods are an Edge Comp, BHAF, 4" exhaust into 6" stacks, and a FASS fuel system. I was running the Edge on 2x2 and the EGT's stayed around 900* at 65-70 mph on a 40* day.

Tonight I took my dual car hauler to the scale, GCVW of 20,000 lbs towing with the 35's on 1x1. I didn't really get to cruise down the highway for a period of time (60 mph), but I would guess they would have ran between 1000-1100*. It was steady at 1150 still lightly accelerating in 6th around 55mph, then i had to turn off. The outdoor temp was 50*.

I'm pretty new to diesels, but from what i've been told this is alittle high even with 35's? Could there be something wrong with the truck? It seems to build boost fine. What is everyone running for EGT's towing?

 

[Cummins Thunder]

What kind of boost can you make?



What speed are you towing at and whats your RPM?



CJ

 

[GEdwards]

Your lugging at low RPMs.



Downshift to 5th and accelerate, then shift back up to 6th.



I notice if your pulling a load or going up a hill and really put your foot into it, that EGTs really go up when in a high gear at a low RPM.



If your only going 50-55 MPH, I wouldn't be afraid to use 5th.

 

[JMalliet]

I can make 40 PSI on 5x5, when towing I hit between 25-30 when accelerating on 2x2 I beleive (tend to watch the pyro more). I said the speeds I was towing at for each situation above. With the 35's my speedo is approximately 5 pmh off. To go 60mph, my speedo has to say 55 (probably around 1650-1700 rpm). 70 mph my speedo has to say 65 (1950-2000 rpm).

 

[JMalliet]

Your lugging at low RPMs.



Downshift to 5th and accelerate, then shift back up to 6th.



I notice if your pulling a load or going up a hill and really put your foot into it, that EGTs really go up when in a high gear at a low RPM.



If your only going 50-55 MPH, I wouldn't be afraid to use 5th.

I think my problem is that I have to go the speedlimit on my speedometer, to go 5 mph over the speedlimit. So my rpm's are lower then I would like them to be with the 35's. I was told guy tow with 35's and 3. 55's without a problem, maybe that isn't true? I have the stock wheels with 295's on them, I could swap to them when towing heavy. I'm kind of curious what everyone else is towing at EGT wise with big loads.

 

[GCULP]

Your lugging at low RPMs.



Downshift to 5th and accelerate, then shift back up to 6th.

don't be afraid to run the R's up on these things, especially when towing, and with 35's too. You can run it all day long at 2200 to 2300 rpm and you'll see a lot lower egt's.