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Silly question but you haven't mentioned if you have anything installed but the SCT Tune, Do you have an upgraded exhaust and free flowing clean air system in place to reduce EGTs? If some coolant pukes from the reservoir people on here seem to be looking immediately at head studs. I have tried to look at all of the puke related posts but have yet to see anyone mention the fact that you have an EGR cooler being cooled by the coolant and that the pressurized system only increases the boiling point so high before the mix will boil. If we see EGTs in the neighborhood of 1500 degrees in some instances, has anyone thought that the problem might be flash boiling the coolant in the system? The EGR is in place to reduce oxides of nitrogen which create that nice brown haze in the atmosphere. Oxides of nitrogen develope when cylinder temps reach 2300 degrees F. So we have 2300 in the cylinder at least and then it gets to the egr system before the turbo and its sometimes 1500 at the turbo. Crazy thought but does anyone think that the cooling system which is in the 200+ degree range can handle 1000+ coming at it? But no it must be that Ford underdesigned the truck because it can't take somebody installing a tuner or a box with occasionally propane on top of that trying to roast 39" tires which is by my math a little over an extra 8.5" in diameter compared with stock wheels and tires. It only makes me smile when someone says their truck only pukes when they have the "instane" or any tune in regardless, and it goes away when the tuner is removed and the newest engineer(someone who buys a PSD and a intake/exhaust/tuner package and posts to say they can't believe the dealer won't warranty their engine) says they must have a damaged head gasket cause thats what happend to their truck. I used to think that if a head gasket was damaged that it was damaged but nowadays its an intermittant problem. The problem couldn't be the overtaxing of the egr cooling system trying to remove the excess heat in the exhaust. The stock trucks are doing it too, does this mean the head gaskets are bad? Maybe they are, but from what I have seen is that even the stock trucks are towing something and its usually 40 feet long. Yes the max that a trailer can weigh is 19.2k but only if its being pulled by a regular cab 4x2 f-350 with 4.10s. If the truck is bigger and has a lower gear ratio numerically then the wieght drops to 15.6k on a cc drw 4x4 350 with 3.73s. Ah yes the question will arise that someones trailer only weighs 10k and how come it still pukes stock? There are a million different variables to each situation such as grade of road in percent not if its paved gravel or other, speed at which this feat of weight movement is being accomplished, ambient air temp, condition of oil, air filter condition, automatic or manual trans, etc. It may be in the range of towable but at what speed and what condition? 60 up a mountain? I guess I went on a little rant, maybe im just tired of hearing Ford built it wrong. I now leave myself open to ridicule.
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ya, what he said
