UPDATE:
Got truck on freeway and ran it up to 76 mph. 76 going up a long grade was the limit, it hit 198 degrees and blurted out coolant. Above 70 going up grade, it will max at 190 and no coolant loss. At 70 or less. It will stay at 183-185 consistantly. At idle it drops to 180-178. I can live with that. Not sure why the system hits limit at 75 mph going up grade. I could probably do 80 on flat ok. Some states have 80 mph speed limits. Get better mileage at 65 anyway.
That's the best I can do with all the cooling upgradegs I've made. Listed as follows 185 degree thermostat, BPD aluminum coolant pump, rerouting coolant filter return into the radiator, the severe duty fan clutch, blue wire fan lockup switch, the next options would a BPD or similar external oil cooler, replace heater core which may have clogging. The EGR has already been removed prior to my ownership. I'm not the only person who has overheating issues with a 6.0 liter Power Stroke as many videos on YouTube demonstrate. At least I have achieved manageable cooling in my engine.
The problem wasn’t your radiator to begin with. And it’s not over heating it’s over pressurizing. Two different things.
And that truck is speed limited unless the tune you may or may not have raised or removed it.
They don’t go faster than 80, stock, as I recall. And that’s hugging 3k rpms with 4:88s in OD.
Do a coolant system pressure test under load. I suspect you may not like the results. Hope I’m wrong.
They don’t go faster than 80, stock, as I recall. And that’s hugging 3k rpms with 4:88s in OD.
close, you would have to work out the math, but they are bassed on rpm (3800-4000) rpm is where the limiter kicks in, but yes it usaly worked out to 75 to 85 mph depending on tire size and gearing. so I would suspect you were hugging close to 4K rpm.
