First, I would like to introduce myself and my truck. I have been a member since 2010 and would like to thank the board for all the great info. Its been my powerstroke bible. I own a 2003 F550 crew cab with a bed. I do have some concerns with delta number and high EOT. To give you some history on my truck..105k miles, studded, EGR delete, S&B intake, SCT Innovated custom tunes, Rotella T6 oil and 488 gears.
A couple weeks ago my truck reached ECT/EOT as high as 226/249. This was while towing 10k lbs from the hitch on a hot day, I also noticed my AC was blowing hot while at a stop so I figured my Fan clutch was bad and sure enough I brought it in and got a new fan clutch.
That solved the AC problem but my deltas and EOT seem a little high still. I do have Gold coolant and Im waiting for the IPR coolant filter to come out before doing my Rotella ELC flush with restore and +.
Now, running around town with no trailer my deltas are less than 10 and my EOT rarely gets above 200. Even with a 5klbs trailer in town my deltas are within 12 and my EOT doesnt get above 215.
My problem is towing on the highway...I dont know if these temps are due to my 488 gears and very high rpms or what but for example the other day I had an empty trailer of 5k lbs cruising at 75mph @ 2800 RPMs and my ECT/EOT were 216/240 it was 104 degress out, I was running an innovated custom street tune and turbo was a steady 13psi. Now here is the reason I think its due to the gearing and RPMs...I decided to slow down to 60mph @ 2200 rpms turbo at 5psi and within minutes I was at 194/216.
I often tow a car trailer with a single vehicle and cruising at 80mph on the highway is what I prefer and with it being a 550 I cant even feel the load but the EOT and delta at that speed worry me. Do you think the high EOTs are due to running such high RPMs? Do you think the oil cooler is starting to fail?
Im wanting to do a coolant flush with Rotella ELC, IPR or another coolant filter, and thermostat and see what happens....ANY and ALL comments are welcomed. Thanks again.