Coming in on the back side of this conversation but my two cents,
My 450 4.30 gears and auto trans hauled a 24ft trailer at about 8000# from the east coast to Montana this summer I saw EGTs on the flats of 975 to 1250 with a nominal of 1050. What concerned me was climbing hils west of Rapid city on I90. Temps quickly shot through the roof on the climbs. Downshifting helped cool things off but the current tunning would not hold the trans in 4th gear... ( Fixing that)
Called out to a couple of Diesel performance shops and this is what I am doing to control the temps.
PTP suggested the follow and for these reasons:
"I'll list a recipe of what I think will offer you the best overall daily performance.
First thing would be a full EGR delete, this alone will help with EGT's and longevity.
Second thing would be a ported intake such as a GoGo stage I, this will also help with EGT's and pick up low end power.
Third thing would be a set of Industrial Injection Phat Shaft modified factory turbos, this again will lower EGT's and increase power across the RPM band.
Forth thing I would recommend would be a good set of after market exhaust manifolds and up pipes like steed speed has, these will also help the low end turbo spool, power and EGT's. The upgraded bellows in the up pipes will also take the abuse of heavy towing with of fatiguing and leaking over time.
A good converter will help out too just by handling the power load better, less slip equals less heat here. I would highly recommend a set of ARP studs to accompany these modifications to help aid the increased cylinder pressures. Also a nice and cheap addition would be a coolant filter kit, this will clean all of the sand left over from the sand cast molds the engine block was cast in. Thats the # 1 killer of the cooling system because its eats away at the water pump, freeze plugs and oil cooler. Less trash in the system the better it will cool. "
I am heading this way in the spring and adding an exhaust brake as well. need a way to slow this beast down better than the OEM program.
My truck is tunned with H&S 300 programming and I run the Mild tune empty or light loaded and no power heavy.
Trans is stock for now just keeping up with 30K mile fluid changes
gearing is 4.30:1 but with 34.5 tall tires the effective is 3.98:1
DPF/DOC are MIA and the EGR is coming out this weekend.
My run west I was on the Crusie control the whole time set to 70. Pulling the hills I dropped the cruise and drove by EGT at one point I was down to 50mph climbing out of WY and still pulling 1200 degrees.
In this configuration I can not use the power the engine makes to pull a significant load at fair speeds plus my mileage sucked. Average of 4200 miles was 9.78 with a high of 10.2 and a low of 8.8. At one point in South Dakota on the flats I was seeing 1175* running 70 and slowing to 65 (now 10mph under) seeing 1190-1200* (something to do with a 30mph headwind).
I have faith in PTP that we can get this beast to perform much better and improve mileage and power application while controling EGTs.
Cheers
Something I would really like to know all opinions aside, what is the Ford/Navistar EGT max continous safe temp for the 6.4? Withthe designed Regen system making killer heat starting at the #4/8 cylinder and the pistons are an Aluminum Alloy what is the spec temp? This high egt runs from the Pistons to the Turbo to the DOC/DPF stock I can't believe that the OEM would purposly ignor the this issue just to get emmissions in spec that makes no sense.
